Specifications

WM_PRJ_Q2501_PTS_001 – 003
March 2004
© 2003 All rights reserved
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Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son
autorisation préalable.
3.3.2 GPS RF performances
The main parameters for receiver are:
Parameter Specification
Receiver type L1 frequency (1575.42 MHz)
C/A code
16-channels
8192 search bins
Max. Update Rate 4 Hz
Position: 2.5m CEP
2
/ 5.0m SEP
3
Accuracy_
(Selective Availability off)
Position DGPS or SBAS
1
: 2.0m CEP / 3.0m SEP
Fast
acquisition
mode
Normal
mode
High
sensitivity
mode
Cold start
4
34 s 36 s 41 s
Warm start 33 s
Acquisition
Hot start < 3.5 s
Signal Reacquisition < 1 s
Fast
acquisition
mode
Normal
mode
High
sensitivity
mode
Acquisition -134 dBm -138 dBm -140 dBm
Sensitivity
6
Tracking -143 dBm -146 dBm -149 dBm
Timepulse Accuracy RMS
99 %
Granularity
50 ns
<100 ns
43 ns
Dynamics
≤
4 g
Operational Limits COCOM restrictions
1
Depends on accuracy of correction data of DGPS or SBAS service
2
CEP=Circular Error Probability: The radius of a horizontal circle, centered at the antenna’s true position, containing 50 % of the fixes.
3
SEP=Spherical Error Probability: The radius of the sphere, centered at the true position, containing 50 % of the fixes.
4
Measured with good visibility and –125 dBm signal strength
5
Demonstrated with active antenna
In Single Coax configuration:

when the module is in idle mode (GSM or GPRS), loss is < 0.1 dB in C/N,

when the module is in GSM TCH/FS or TCH/data mode, loss is roughly
4 dB in C/N.
Because of high number of GSM slots allocated in packet data transmission
(GPRS), the use of single coax configuration is not recommended with GPRS.