Navman GPS Receiver LA000508 User Manual

Jupiter 20  
GPS receiver module  
Data Sheet  
Related documents  
• Jupiter 20 Integrator’s manual LA000508  
• Jupiter 20 Product brief LA000509  
• Jupiter Series development kit guide  
LA000645  
• SiRF Binary protocol reference manual  
• Navman NMEA reference manual  
MN000315  
• Jupiter 20 DR application note LA000433  
• Low Power Operating Modes application  
note LA000513  
LA000507G © 2006 Navman New Zealand. All rights reserved. Proprietary information and specifications subject to change without notice.  
 
Figures  
Tables  
LA000507G © 2006 Navman New Zealand. All rights reserved. Proprietary information and specifications subject to change without notice.  
 
1.0 Introduction  
The Jupiter 20 GPS receiver module is a very small surface mount receiver that is intended  
as a component for OEM (Original Equipment Manufacturer) products. The module provides  
a 12‑channel receiver that continuously tracks all satellites in view and provides accurate  
positioning data.  
2.0 Technical description  
The highly integrated digital receiver incorporates and enhances the established technology  
of the SiRFstarIIe/LP chipset. It is designed to meet the needs of the most demanding  
applications, such as vehicle tracking in dense urban environments. The interface configuration  
allows incorporation into many existing devices and legacy designs.  
The Jupiter 20 receiver decodes and processes signals from all visible GPS satellites. These  
satellites, in various orbits around the Earth, broadcast RF (radio frequency) ranging codes,  
timing information, and navigation data messages. The receiver uses all available signals to  
produce a highly accurate navigation solution. The 12‑channel architecture provides rapid TTFF  
(Time To First Fix) under all start‑up conditions. Acquisition is guaranteed under all initialisation  
conditions as long as visible satellites are not obscured.  
The Jupiter 20 is available in three configurations:  
• Jupiter 20 (standard) – GSW2.3 navigation software  
• Jupiter 20S (high sensitivity) – with XTrac navigation software  
• Jupiter 20D (Dead Reckoning) – with SiRFDRive software and gyro interface  
Protocols supported are selected NMEA (National Marine Electronics Association) data  
messages and SiRF binary.  
2.1 Product applications  
The module is designed for high performance and maximum flexibility in a wide range of OEM  
configurations including hand‑helds, sensors, and in‑vehicle automotive products.  
2.2 Receiver architecture  
The functional architecture of the Jupiter 20 receiver is shown in Figure 2‑1.  
Module architecture  
DR Modules only  
GYRO IN  
wheel  
ticks  
forward/  
reverse  
PWRIN  
active or passive antenna  
ADC  
UART  
ports  
controls/  
GPIO  
TCXO  
RFIC  
bias T  
baseband  
processor  
bandpass  
filter  
LNA  
RFIN  
V_ANT  
input  
RTC crystal  
1.8V  
2.8V  
regulator  
regulator  
AD [0‑18]  
D [0‑15]  
CTRL  
PWRIN  
Flash memory  
brown out  
detector  
ORing  
circuit  
PWRIN  
VBATT  
Figure 2-1: Jupiter 20 module architecture  
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2.3 Major components of the Jupiter 20  
LNA (Low Noise Amplifier): This amplifies the GPS signal and provides enough gain for the  
receiver to use a passive antenna. A very low noise design is utilised to provide maximum  
sensitivity.  
Bandpass filter (1.575GHz): This filters the GPS signal and removes unwanted signals caused by  
external influences that would corrupt the operation of the receiver.  
RFIC (Radio Frequency Integrated Circuit): The RFIC (SiRFstarII GRF 2i/LP) and related  
components convert the GPS signal into an intermediate frequency and then digitise it for use by  
the baseband processor.  
TCXO (Temperature Compensated Crystal Oscillator): This highly stable 24.5535MHz oscillator  
controls the down conversion process for the RFIC block. Stability in this frequency is required  
to achieve a fast TTFF.  
Baseband processor: The SiRFstarII GSP 2e/LP processor is the main engine of the GPS  
receiver. It runs all GPS signal measurement code, navigation code, and other ancillary routines,  
such as power saving modes. The normal I/O of this processor is via the two serial ports.  
Flash memory: The Flash memory stores software and also some long term data.  
RTC (Real Time Clock) crystal: The 32kHz crystal operates in conjunction with the RTC inside  
the baseband processor. It provides an accurate clock function when main power has been  
removed, if the battery backup is connected.  
Reset generator: There are two voltage threshold reset generators in the Jupiter 20. The first  
provides a reset to the baseband block if the main power drops below a low limit threshold.  
The second shuts off the supply to the RTC in case the backup battery drops below a lower  
threshold. This is used to compensate for a slow SiRF rise‑time backup voltage.  
Regulators: The regulators provide a clean and stable voltage supply to the components in the  
receiver.  
DR (Dead Reckoning) components: The Jupiter 20D has additional components allowing direct  
connection to a turn rate gyro. The gyro input takes the form of a high resolution ADC (Analogue  
to Digital Converter), where the analogue signal is digitised and prepared for use by the  
SiRFDRive DR software running in the baseband processor.  
2.4 Physical characteristics  
The Jupiter 20 receiver is packaged on a miniature printed circuit board with a metallic RF  
enclosure on one side. The standard or DR configuration must be selected at the time of  
ordering and is not available for field retrofitting.  
A lead‑free RoHS compliant product has been available since the end of 2005.  
2.5 Mechanical specification  
The physical dimensions of the Jupiter 20 are as follows:  
length:  
width:  
25.4mm ± 0.1mm  
25.4mm ± 0.1mm  
thickness: 3.0mm max  
weight: 4.0g max  
Refer to Figure 8‑1 for the Jupiter 20 mechanical drawing.  
2.6 External antenna surface mount pads  
The RF surface mount pad for the external antenna has a characteristic impedance of 50ohms.  
2.7 I/O and power connections  
The I/O (Input Output) and power connections use surface mount pads with edge plating around  
the edge of the module.  
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2.8 Environmental  
The environmental operating conditions of the Jupiter 20 are as follows:  
temperature: –40ºC to +85ºC  
humidity:  
altitude:  
up to 95% non‑condensing or a wet bulb temperature of +35ºC  
–304m to 18000m  
vibration:  
random vibration IEC 68‑2‑64  
max. vehicle dynamics:500m/s  
shock (non‑operating): 18 G peak, 5 ms  
2.9 Compliances  
The Jupiter 20 complies with the following:  
Directive 2002/95/EC on the restriction of the use of certain hazardous substances in  
electrical and electronic equipment (RoHS)  
CISPR22 and FCC: Part 15, Class B for radiated emissions  
Automotive standard TS 16949  
Manufactured in an ISO 9000:2000 accredited facility  
2.10 Marking/Serialisation  
The Jupiter 20 supports a code 128 barcode indicating the unit serial number. The Navman  
13‑character serial number convention is:  
characters 1 and 2: year of manufacture (e.g. 06=2006, 07=2007)  
characters 3 and 4: week of manufacture (1 to 52, starting first week in January)  
character 5: manufacturer code  
characters 6 and 7: product and type  
character 8: product revision  
characters 9-13: sequential serial number  
3.0 Performance characteristics  
3.1 TTFF (Time To First Fix)  
TTFF is the actual time required by a GPS receiver to achieve a position solution. This  
specification will vary with the operating state of the receiver, the length of time since the last  
position fix, the location of the last fix, and the specific receiver design.  
3.1.1 Hot start  
A hot start results from a software reset after a period of continuous navigation, or a return  
from a short idle period (i.e. a few minutes) that was preceded by a period of continuous  
navigation. In this state, all of the critical data (position, velocity, time, and satellite  
ephemeris) is valid to the specified accuracy and available in SRAM (Static Random Access  
Memory). Battery backup of the SRAM and RTC during loss of power is required to achieve a  
hot start.  
3.1.2 Warm start  
A warm start typically results from user‑supplied position and time initialisation data or  
continuous RTC operation with an accurate last known position available in memory. In this  
state, position and time data are present and valid but ephemeris data validity has expired.  
3.1.3 Cold start  
A cold start acquisition results when either position or time data is unknown. Almanac  
information is used to identify previously healthy satellites.  
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3.2 Acquisition times  
Table 3‑1 shows the corresponding TTFF times for each of the acquisition modes.  
J20  
J20S  
90%  
J20D  
90%  
Mode  
Typ  
90%  
Typ  
Typ  
TTFF hot  
8s  
12s  
8s  
12s  
40s  
56s  
8s  
12s  
40s  
70s  
(valid almanac, position, time & ephemeris)  
TTFF warm  
(valid almanac, position & time)  
38s  
42s  
55s  
38s  
35s  
52s  
TTFF cold  
(valid almanac)  
44s  
45s  
re‑acquisition  
(<10s obstruction with valid almanac,  
position, time & ephemeris)  
100ms 100ms 100ms 100ms 100ms 100ms  
Table 3-1: TTFF acquisition times  
3.3 Timing 1PPS output  
The 1PPS (Pulse Per Second) output of the Jupiter 20 receiver is <1µs, typical ±300ns in  
reference to UTC (Coordinated Universal Time). This feature is currently only available on the  
Jupiter 20 standard module.  
3.4 Battery backup (SRAM/RTC backup)  
During powered down conditions, the SRAM and RTC may be kept operating by supplying  
power from the VBATT as shown in Table 4‑1. The Jupiter 20 can accept slow VBATT supply  
rise time (unlike many other SiRFstarII based receivers) due to an on‑board voltage detector.  
3.5 TricklePower mode  
During normal mode of operation the Jupiter 20 is continuously running, providing a navigation  
solution at the maximum rate of once per second. This continuous mode provides no power  
saving.  
The TricklePower mode of operation can be enabled to reduce the average power consumption.  
The main power is supplied to the module continuously. An internal timer wakes the processor  
from sleep mode. The module computes a navigation position fix, after which the processor  
reverts to sleep mode. The duty cycle is controlled by a user‑configurable parameter.  
If ephemeris data becomes outdated, the TricklePower mode will attempt to refresh the data set  
within every 30‑minute period, or for every new satellite that comes into view.  
With TricklePower set to a 20% duty cycle, a power saving of 50% can easily be achieved with  
minimal degradation in navigation performance.  
3.5.1 Adaptive TricklePowermode  
In Adaptive TricklePower mode, the processor automatically returns to full power when signal  
levels are below the level at which they can be tracked in TricklePower mode. This is the  
default behaviour when TricklePower is active.  
3.5.2 Push-To-Fix mode  
Unlike TricklePower, the operation in this mode is not cyclic. This mode always forces the  
GPS software to revert to a continuous sleep mode after a navigation position fix. It will stay  
in sleep mode until woken by activation of the reset input, and compute a fresh position.  
If the ephemeris data becomes invalid, the RTC has the ability to self activate and refresh the  
data, thus keeping the restart TTFF very short.  
This mode yields the lowest power consumption of the module, and is ideal where a battery  
powered application requires very few position fixes.  
For further information on the TricklePower and Push‑To‑Fix modes refer to the Low Power  
Operating Modes application note (LA000513).  
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3.6 Differential aiding  
3.6.1 Differential GPS (DGPS)  
DGPS specification improves the Jupiter 20 horizontal position accuracy to <4m 2dRMS.  
3.6.2 Satellite Based Augmentation Systems (SBAS) including WAAS and EGNOS  
SBAS improves horizontal position accuracy by correcting GPS signal errors caused by  
ionospheric disturbances, timing and satellite orbit errors. The Jupiter 20 is capable of  
receiving WAAS and EGNOS differential corrections. Both SBAS and DGPS should improve  
position accuracy. However, other factors can affect accuracy, such as GDOP (Geometric  
Dilution of Precision), multipath, distance from DGPS reference station and latency of  
corrections. Note also that XTrac does not support differential aiding.  
3.7 Navigation modes  
The Jupiter 20 GPS receiver supports 3D (three‑dimensional) and 2D (two‑dimensional) modes  
of navigation.  
3D navigation: The receiver defaults to 3D navigation when at least four GPS satellites are being  
tracked. In 3D navigation, the receiver computes latitude, longitude, altitude, and time from  
satellite measurements.  
2D navigation: When less than four GPS satellite signals are available, or when a fixed altitude  
value can be used to produce an acceptable navigation solution, the receiver will enter 2D  
navigation mode using a fixed value of altitude determined by the host. Forced operation in 2D  
mode can be commanded by the host.  
In 2D navigation, the navigational accuracy is primarily determined by the relationship of the  
fixed altitude value to the true altitude of the antenna. If the fixed value is correct, the specified  
horizontal accuracies apply. Otherwise, the horizontal accuracies will degrade as a function of  
the error in the fixed altitude.  
3.8 Core processor performance  
The standard Jupiter 20 with GSW2 software runs at a CPU clock speed of 12.28MHz. Using  
XTrac software (Jupiter 20S), the clock speed increases to 24.5MHz. An SDK (Software  
Development Kit) is available from SiRF to customise the Jupiter 20 firmware. Using the SiRF  
SDK the clock speed can be increased up to 49MHz.  
The processing power used by the navigation software is shown in Table 3‑2.  
Parameter  
J20/J20D  
2‑3 MIPS  
6‑7 MIPS  
J20S  
typical performance  
peak performance  
4‑5 MIPS  
8‑9 MIPS  
Table 3-2: Software processing performance  
3.9 Sensitivity  
The GPS receiver performance of the Jupiter 20 is shown in Table 3‑3.  
Parameter  
J20/J20D  
J20S  
–135dBm  
acquisition sensitivity  
navigation sensitivity  
tracking sensitivity  
–135dBm  
33dBHz  
28dBHz  
26dBHz  
33dBHz  
17dBHz  
15dBHz  
–141dBm  
–143dBm  
–152dBm  
–154dBm  
Table 3-3: GPS receiver performance  
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3.10 Dynamic constraints  
The Jupiter 20 receiver is programmed to deliberately lose track if any of the following limits are  
exceeded:  
Velocity:  
500m/s max  
Acceleration: 4G (39.2m/s2) max  
Vehicle jerk: 5m/s3 max  
Altitude:  
18000m max (referenced to MSL)  
3.11 Position and velocity accuracy  
The position and velocity accuracy of the Jupiter 20 are shown in Table 3‑4, assuming full  
accuracy C/A code (Clear/Acquisition). These values are the same in normal operation and  
when TricklePower is active.  
Parameter  
horizontal CEP  
J20/J20D  
2.1m  
J20S  
2.2m  
horizontal (2dRMS)  
vertical VEP  
5.2m  
5.5m  
2.5m  
2.5m  
velocity 2D (2 sigma)*  
*at a velocity greater than km/h  
0.1m/s  
0.15m/s  
Table 3-4: Position and velocity accuracy  
4.0 Electrical requirements  
4.1 Power supply  
4.1.1 Primary power  
The Jupiter 20 GPS receiver is designed to operate from a single supply voltage, meeting the  
requirements shown in Table 4‑1.  
Parameter  
input voltage  
J20  
2.9 to 3.6VDC  
75mA  
J20S  
2.9 to 3.6VDC  
85mA  
J20D  
2.9 to 3.6VDC  
80mA  
current (typ) at full power (3.3V)  
current (max)  
100mA  
100mA  
100mA  
current (typ) at 20% TricklePowerTM  
battery backup voltage  
battery backup current  
maximum rise time  
35mA  
60mA  
35mA  
2.4V to 3.6V  
<10µA typ at 25°C  
unlimited  
ripple  
not to exceed 50mV peak to peak  
Table 4-1: Operating power for the Jupiter 20  
4.1.2 Low supply voltage detector  
The module will enter a reset mode if the main supply drops below 2.8V.  
4.1.3 VCC_RF power supply  
The VCC_RF (pad 20) provides a regulated 2.8V power source. The specifications for this  
supply are as follows:  
voltage: 2.8V ± 2%  
current max: 25mA for J20/J20S; 5mA for J20D  
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4.1.4 External antenna voltage  
DC power is supplied to the external antenna through the antenna power input pad (VANT).  
The receiver does not use this supply. The DC supply to the RF connection does not current  
limit in the event of a short circuit. Reference designs for antenna current limit are available in  
the Jupiter 20 Integrator’s manual (LA000508).  
The external antenna characteristics are as follows:  
voltage (typ): 3.3V  
voltage max: 12V  
current max: 100mA  
Warning: if the antenna or its cable develops a short circuit and the external antenna  
current is not limited, the GPS receiver will experience permanent damage.  
4.1.5 RF (Radio Frequency) input  
RF input is 1575.42MHz (L1 Band) at a level between –135dBm and –152dBm into a 50ohm  
impedance. This input may have a DC voltage impressed upon it to supply power to an active  
antenna. The maximum input return loss is –9 dB.  
4.1.6 Antenna gain  
The receiver will operate with a passive antenna of unity gain. However, GPS performance  
will be optimum when an active antenna is used. The gain of this antenna should be in the  
range of 20dB to 30dB.  
4.1.7 Burnout protection  
The receiver accepts without risk of damage a signal of +10dBm from 0 to 2GHz carrier  
frequency, except in band 1560 to 1590 MHz where the maximum level will be –10dBm.  
4.1.8 Jamming performance  
The typical jamming performance of the receiver based upon a 3dB degradation in C/N0  
(Carrier to Noise power ratio) performance is shown in Table 4‑2. This is with reference to the  
external antenna.  
Jamming signal  
Frequency MHz  
power dBm  
1400  
1425.42  
1530  
–19  
–16  
–27  
–69  
–114  
–33  
–19  
1555  
1575.42  
1625.42  
1725.42  
Table 4-2: Typical jamming performance  
4.1.9 Flash upgradability  
The firmware programmed in the Flash memory may be upgraded via the serial port. The  
user can control this by pulling the Serial BOOT pad (3) high at startup, then downloading the  
code from a PC with suitable software (e.g. SiRFFlash). In normal operation this pad should  
be left floating for minimal current drain. It is recommended that in the user’s application, the  
BOOT pad is connected to a test pad for use in future software upgrades.  
4.1.10 Reset input  
This active low input (pad 22) allows the user to restart the software from an external signal.  
It is also used to initiate a ‘push‑to‑fix’ navigation cycle. In normal operation this pad should  
be left floating or activated by an open drain driver. Active pull‑up is not recommended.  
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10  
 
 
4.2 Data input output specifications  
All communications between the Jupiter 20 receiver and external devices are through the I/O  
surface mount pads. These provide the contacts for power, ground, serial I/O and control. Power  
requirements are discussed in Section 4.1.  
4.2.1 Voltage levels  
The I/O connector voltage levels measured at PWR_IN = 3V are shown in Table 4‑3.  
Signal  
Parameter  
VIH (min)  
Value  
2.0V  
VIH (max)  
PWR_IN +0.1V  
0.1V  
VIL (min)  
TXD & RXD  
GPIOs  
SPI bus  
VIL (max)  
0.8V  
2.0V  
VOH (min) at IOH 2mA  
VOH (max)  
PWR_IN  
0
VOL (min)  
1.0V  
VOL (max) at IOL 2mA  
max capacitance Cmax  
input current max  
pulse time min  
100pF  
–600μA  
200μs  
Reset input*  
*Reset input should not be driven high by external circuits. It  
is recommended that this input is driven low by an open drain  
interface.  
Table 4-3: Interface voltage levels  
4.2.2 I/O surface mount pads  
Details of the surface mount pad functions are shown in Table 4‑4 and 4‑5.  
Pad  
No.  
Name  
Type  
Description  
gyro input (analogue 0–5V)  
8*  
GYRO_IN  
FWD/REV  
I
I
I
27*  
28*  
fwd/rev input (low=forward, high=reverse)  
wheel tick input  
WHEEL_TICKS  
* See also Table ꢀ‑ꢁ for J20/J20S pad functions  
Table 4-4: J20D receiver pad functions  
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Pad  
No.  
Name  
Type  
Description  
main power input (3.3V)  
1
2
PWRIN  
GND  
P
P
ground  
serial boot (high for serial boot, low or open circuit for  
normal operation)  
3
BOOT  
I
4
5
6
7
RXA  
TXA  
TXB  
RXB  
I
CMOS level asynchronous input for UART A  
CMOS level asynchronous output for UART A  
CMOS level asynchronous output for UART B  
CMOS level asynchronous input for UART B  
O
O
I
GPIO3/  
ADC_CONV/  
NANT_SC  
general purpose IO/  
output for external A/D converter control/  
antenna short circuit sensor input (active low)  
8*  
9
IO  
output to indicate whether the RF section is enabled  
(active high)  
RF_ON  
O
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
GND  
GND  
P
P
P
P
P
P
P
I
ground  
ground  
GND  
ground  
GND  
ground  
GND  
ground  
GND  
ground  
GND  
ground  
RF_IN  
antenna signal input  
GND  
P
P
O
P
I
ground  
V_ANT  
external power supply for active antenna  
RF Power (+2.8V) supply output  
backup battery input  
VCC_RF  
V_BATT  
RESET  
GPIO10/GPS_FIX  
GPIO6/SDO  
GPIO5/SDI  
GPIO7/SCK  
master reset (active low)  
general purpose IO or GPS fix indication (active low)  
general purpose IO or SPI serial data out  
general purpose IO or SPI serial data in  
general purpose IO or SPI serial clock  
IO  
IO  
IO  
IO  
GPIO15/  
ANT_OC  
general purpose IO/  
antenna open circuit sensor input (active high)  
27*  
28*  
IO  
IO  
GPIO1/  
ANT_CTRL  
general purpose IO/  
antenna DC power control output (ON=high)  
29  
GPIO9/1PPS  
GND  
O
P
general purpose IO or 1 pulse per second output  
ground  
30  
* See also Table ꢀ‑ꢀ for J20D pad functions  
Table 4-5: J20/J20S receiver pad functions  
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5.0 Software interface  
The host serial I/O port of the receiver’s serial data interface supports full duplex communication  
between the receiver and the user. The default serial modes are shown in Table 5‑1.  
J20  
(GSW2.3)  
J20S  
(XTrac)  
J20D  
(SiRFDRive 1.0)  
Port  
Port A  
Port B  
NMEA, 9600  
RTCM, 9600  
NMEA, 9600  
NMEA, 9600  
RTCM, 9600  
SiRF binary, 38400  
Table 5-1: Jupiter 20 default baud rates  
5.1 NMEA output messages  
The output NMEA (0183 v2.2) messages and intervals for the receiver are listed in Table 5‑2.  
A complete description of each NMEA message is contained in the Navman NMEA reference  
manual (MN000315).  
NMEA message  
GGA  
J20  
1s  
1s  
1s  
1s  
1s  
1s  
1s  
N/A  
J20S  
1s  
J20D  
1s  
GSA  
1s  
1s  
GSV  
1s  
1s  
RMC  
1s  
1s  
VTG  
1s  
1s  
GLL  
1s  
1s  
ZDA  
N/A  
N/A  
N/A  
1s  
PTTK, DR  
N/A=not available  
Table 5-2: Default NMEA messages  
5.2 SiRF binary  
A complete description of each binary message is contained in the SiRF Binary Protocol  
reference manual.  
5.3 Software functions and capabilities  
The Jupiter 20 has additional capabilities to the standard SiRF GPS software:  
• GPS fix output – GPIO10 Low for 2D or 3D fix  
• GPIO command control via serial commands – for use by customer  
• Gyro, wheel‑tick and forward reverse inputs (DR only)  
• Antenna power monitor messages and power control O/P (non DR only)  
• PTTK, DR – DR status messages in NMEA protocol format  
Refer to the Jupiter 20 Integrator’s manual (LA000508) for further information.  
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13  
 
 
Table 5‑3 shows the software features available with the Jupiter 20 configurations.  
Feature  
Description  
J20  
GSW2.3  
J20S  
XTrac  
J20D  
SiRFDrive  
Improves position accuracy by using freely available  
SBAS capability satellite‑based correction services called SBAS (Satellite  
Based Augmentation System)  
A
A
E
DGPS ready  
TricklePower  
Accepts DGPS corrections in the RTCM SC‑104 format  
E
A
Improves battery life using this enhanced power management  
mode  
A
Adaptive  
TricklePower  
Intelligently switches between TricklePower and full power  
depending on the current GPS signal level (when TricklePower  
is enabled)  
yes  
E
Advanced power Improves battery life using a software‑based power  
A
A
management  
management  
Push‑to‑Fix  
Provides an on‑demand position fix mode designed to further  
improve battery life  
A
Almanac to  
Flash  
Improves cold start times by storing the most recent almanac to  
flash memory  
yes  
yes  
Low signal  
acquisition  
Acquires satellites and continues tracking in extremely low  
signal environments  
yes  
yes  
Low signal  
navigation  
Continues navigating in extremely low signal environments  
1 PPS  
A timing signal generated every second on the second  
E
E
yes=always enabled A=available E=enabled by default in production units  
Table 5-3: Jupiter 20 software capability  
6.0 Dead Reckoning input specifications  
6.1 Gyro input specification  
The specifications shown in Table 6‑1 apply to the Jupiter 20D only.  
Characteristics  
input max voltage range  
input resistance nominal  
nominal bias at zero angular velocity  
nominal scale factor  
Value  
max +5, min 0  
18.2  
Unit  
VDC  
kΩ  
2.5  
VDC  
22.2  
mV per degrees/s  
%
linearity  
±0.5 max  
0.055  
angular resolution  
degrees/s  
degrees/s  
max gyro angular rate  
±80  
Note that clockwise rotation should cause the input to rise  
Table 6‑1: Gyro input specifications  
At the time of publication, recommended manufacturers of gyros are as follows:  
Murata ENV series  
Panasonic EWTS series  
(Navman takes no responsibility for the use of these gyros in an application.)  
6.2 Wheel tick rate  
The wheel tick rate is 4kHz maximum, 1Hz minimum.  
6.3 Fwd/Rev input sense  
The fwd/rev input sense is: LOW=forward, HIGH=reverse. External pull down is required if this  
input is not used.  
LA000507G © 2006 Navman New Zealand. All rights reserved. Proprietary information and specifications subject to change without notice.  
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7.0 Jupiter 20 development kit  
The Jupiter 20 Development kit series assists in the integration of the Jupiter 20 module  
in custom applications. The Development kit contains all of the necessary hardware and  
software to carry out a thorough evaluation of the Jupiter 20 module. Refer to the Jupiter Series  
Development kit guide (LA000645) for further details.  
The following development kits are available for Jupiter 20 products:  
• TU10‑D057‑400 Jupiter 20 Development kit RoHS  
• TU10‑D057‑401 Jupiter 20 S Development kit RoHS  
• TU10‑D057‑402 Jupiter 20 DR Development kit RoHS  
8.0 Jupiter 20 mechanical drawing  
25.4 ± 0.1  
1
30  
15  
16  
top view  
3.0 max  
side view  
3.0 max  
R0.4  
side view  
detail A  
A
1.0  
23.4  
scale 6:1  
bottom view  
all dimensions are in mm  
Figure 8-1: Jupiter 20 mechanical layout  
LA000507G © 2006 Navman New Zealand. All rights reserved. Proprietary information and specifications subject to change without notice.  
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9.0 Product handling  
9.1 Packaging and delivery  
Jupiter 20 modules are shipped in Tape and Reel form. The reeled modules are shipped with  
250 units per 300x44mm (DxW) reel with a pitch of 32mm. Each reel is ‘dry’ packaged and  
vacuum sealed in an MMB (Moisture Barrier Bag) with two silica gel packs and placed in a  
carton.  
The MOQ (Minimum Order Quantity) for shipping is 250 units.  
All packaging is ESD protective lined. Please follow the MSD and ESD handling instructions on  
the labels of the MMB and exterior carton (refer to sections 9.2 and 9.3).  
9.2 Moisture sensitivity  
The Jupiter 20 GPS receiver is an MSD (Moisture Sensitive Device). Precautionary measures  
are required in handling, storing and using such devices to avoid damage from moisture  
absorption. If localised heating is required to rework or repair the device, precautionary methods  
are required to avoid exposure to solder reflow temperatures that can result in performance  
degradation.  
Further information can be obtained from the IPC/JEDEC standard J‑STD‑033: Handling,  
Packing, Shipping and Use of Moisture/Reflow Sensitive Surface Mount Devices.  
9.3 ESD sensitivity  
The Jupiter 20 GPS receiver contains class 1 devices and is ESDS (ElectroStatic Discharge  
Sensitive). Navman recommends the two basic principles of protecting ESDS devices from  
damage:  
• Only handle sensitive components in an ESD Protected Area (EPA) under protected and  
controlled conditions  
• Protect sensitive devices outside the EPA using ESD protective packaging  
All personnel handling ESDS devices have the responsibility to be aware of the ESD threat to  
reliability of electronic products.  
Further information can be obtained from the IEC Technical Report IEC61340‑5‑1 & 2:  
Protection of electronic devices from electrostatic phenomena.  
9.4 Safety  
Improper handling and use of the Jupiter GPS receiver can cause permanent damage to the  
receiver and may even result in personal injury.  
9.5 RoHS compliance  
This product complies with Directive 2002/95/EC on the restriction of the use of certain  
hazardous substances in electrical and electronic equipment.  
9.6 Disposal  
We recommend that this product should not be treated as household waste. For  
more detailed information about recycling of this product, please contact your local  
waste management authority or the reseller from who you purchased the product.  
LA000507G © 2006 Navman New Zealand. All rights reserved. Proprietary information and specifications subject to change without notice.  
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10.0 Ordering information  
The part numbers of the Jupiter 20 variants are shown in Table 10‑1.  
Part Number  
TU20‑D411‑001  
TU20‑D411‑101  
TU20‑D421‑201  
TU20‑D101‑001  
TU10‑D007‑400  
TU10‑D007‑401  
TU10‑D007‑402  
Description  
Jupiter 20 (standard)  
Jupiter 20S (with XTrac)  
Jupiter 20D (with Dead Reckoning)  
Jupiter 20 std adapter  
Jupiter 20 std development kit  
Jupiter 20S development kit  
Jupiter 20D development kit  
Table 10-1: Jupiter 20 ordering information  
11.0 Glossary and acronyms  
2dRMS: twice distance Root Mean Square  
ADC: Analogue to Digital Converter  
Almanac: A set of orbital parameters that allows calculation of approximate GPS satellite  
positions and velocities. The almanac is used by a GPS receiver to determine satellite visibility  
and as an aid during acquisition of GPS satellite signals. The almanac is a subset of satellite  
ephemeris data and is updated weekly by GPS Control.  
C/A code: Coarse Acquisition code  
A spread spectrum direct sequence code that is used primarily by commercial GPS receivers to  
determine the range to the transmitting GPS satellite.  
DGPS: Differential GPS  
A technique to improve GPS accuracy that uses pseudo‑range errors recorded at a known  
location to improve the measurements made by other GPS receivers within the same general  
geographic area.  
GDOP: Geometric Dilution of Precision  
A factor used to describe the effect of the satellite geometry on the position and time accuracy  
of the GPS receiver solution. The lower the value of the GDOP parameter, the less the error in  
the position solution. Related indicators include PDOP, HDOP, TDOP and VDOP.  
EGNOS: European Geostationary Navigation Overlay Service  
The system of geostationary satellites and ground stations developed in Europe to improve the  
position and time calculation performed by the GPS receiver.  
Ephemeris  
A set of satellite orbital parameters that is used by a GPS receiver to calculate precise GPS  
satellite positions and velocities. The ephemeris is used to determine the navigation solution and  
is updated frequently to maintain the accuracy of GPS receivers.  
GPS: Global Positioning System  
A space‑based radio positioning system that provides accurate position, velocity, and time data.  
OEM: Original Equipment Manufacturer  
Re-acquisition  
The time taken for a position to be obtained after all satellites have been made invisible to the  
receiver.  
SBAS: Satellite Based Augmentation System  
Any system using a network of geostationary satellites and ground stations to improve the  
performance of a Global Navigation Satellite System (GNSS), e.g. EGNOS and WAAS.  
SRAM: Static Random Access Memory  
WAAS: Wide Area Augmentation System  
System of satellites and ground stations developed by the FAA (Federal Aviation Administration)  
providing GPS signal corrections. (Currently available for North America only.)  
LA000507G © 2006 Navman New Zealand. All rights reserved. Proprietary information and specifications subject to change without notice.  
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SiRF and SiRF logo are registered trademarks of SiRF Technology, Inc. SiRFstar, Push‑to‑Fix, and TricklePower are  
trademarks of SiRF Technology, Inc. All other trademarks mentioned in this document are property of their respective  
owners.  
© 2006 Navman New Zealand. All Rights Reserved.  
Information in this document is provided in connection with Navman New Zealand (‘Navman’) products. These materials  
are provided by Navman as a service to its customers and may be used for informational purposes only. Navman  
assumes no responsibility for errors or omissions in these materials. Navman may make changes to specifications and  
product descriptions at any time, without notice. Navman makes no commitment to update the information and shall have  
no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its specifications and product  
descriptions. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by  
this document. Except as provided in Navman’s Terms and Conditions of Sale for such products, Navman assumes no  
liability whatsoever.  
THESE MATERIALS ARE PROVIDED ‘AS IS’ WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR  
IMPLIED, RELATING TO SALE AND/OR USE OF NAVMAN PRODUCTS INCLUDING LIABILITY OR WARRANTIES  
RELATING TO FITNESS FOR A PARTICULAR PURPOSE, CONSEQUENTIAL OR INCIDENTAL DAMAGES,  
MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY  
RIGHT. NAVMAN FURTHER DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION,  
TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. NAVMAN SHALL NOT BE  
LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT  
LIMITATION, LOST REVENUES OR LOST PROFITS, WHICH MAY RESULT FROM THE USE OF THESE MATERIALS.  
Navman products are not intended for use in medical, lifesaving or life sustaining applications. Navman customers using  
or selling Navman products for use in such applications do so at their own risk and agree to fully indemnify Navman  
for any damages resulting from such improper use or sale. Product names or services listed in this publication are for  
identification purposes only, and may be trademarks of third parties. Third‑party brands and names are the property  
response: Navman strives to produce quality documentation and welcomes your feedback. Please send comments  
and suggestions to [email protected]. For technical questions, contact your local Navman sales office or field  
applications engineer.  
LA000507G © 2006 Navman New Zealand. All rights reserved. Proprietary information and specifications subject to change without notice.  
1ꢄ  
 

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