B
Technical Specifications
52
GPS/GLONASS Receiver User Manual Rev 1
Table B.1 MiLLennium-GLONASS GPSCard Specifications (continued)
PERFORMANCE
(Subject To GPS and GLONASS System Characteristics)
Frequency (L1)
GPS = 1575.42 MHz (
±
0.5)
GLONASS = 1602 - 1615.5 MHz
Codes tracked
C/A codes
Channels
10 GPS, 6 GLONASS (10 GPS, 8 GLONASS channel configuration is an option)
Re-acquisition
1.5-5 s typical
Computed Position Update Rate
Up to 4 solutions per second
Measured Data Update Rate
4 data records per second
Height Limit
Up to 18,288 m (60,000 feet), in accordance with export licensing
Velocity Limit
Up to 515 m/s (1000 Nmi/hr), in accordance with export licensing
Time to First Fix
70 s typical (cold start: no initial time or almanac)
Data Latency
Delay from measurement epoch until the first bit of transmitted log.
PRTKB (differential)
160 ms typical
Pseudorange
Position Accuracy (real-time)
Standalone: 10 m CEP, GDOP < 2
Differential: Code (with choke ring, HDOP <2) = CEP < 0.75 m
RTK Position Accuracy
see Table 4.3 RT10 Convergence Summary on Page 41
Velocity Accuracy
0.03 m/s nominal (differential); 0.15 m/s nominal (single point)
Time Accuracy (relative)
50 ns (SA off); 250 ns (SA on)
INPUT/OUTPUT DATA INTERFACE
Dual RS-232C Serial
Bit rates: 300, 1200, 4800, 9600, 19200, 57600, 115200 bps (9600 bps default)
Signals supported
TX, RX, RTS, CTS, DTR, DSR, DCD
Electrical format
EIA RS232C Standard
INPUT/OUTPUT STROBES
VARF Output
A programmable variable frequency output ranging from 0.15 Hz - 5 MHz (refer to the
FREQUENCY_OUT command in the MiLLennium Command Descriptions Manual), with
pulse width from 100 ns to 6.55 ms. This is a normally high, active low pulse. There may be
as much as 50 ns jitter on this signal.
PPS Output
A one-pulse-per-second time synchronization output. This is a normally high, active low pulse
(1 ms ± 50 ns) where the falling edge is the reference.
Measure Output
4 pulses-per-second output, normally high, active low where the pulse width is 1 ms. The
falling edge is the receiver measurement strobe.
Mark Input
An input mark (negative pulse > 55 ns), time tags output log data to the time of the falling edge
of the mark input pulse (refer to the LOG command syntax - ONMARK in the MiLLennium
Command Descriptions Manual).
Status Output
Indicates a valid GPS position solution is available. A high level indicates a valid solution or
that the FIX POSITION command has been set (refer to the FIX POSITION command in the
MiLLennium Command Descriptions Manual).
RESETOUT
Polarity- positive pulse; 140 ms
≤
pulse duration
≤
280 ms
\RESETIN
A high to low transition causes a system reset.
The electrical specifications of the strobe signals are as follows:
Output
Voltage:
Standard TTL levels
Sink Current:
Source Current:
64 mA
15 mA
Input
Voltage:
Standard TTL levels
Current:
≤
5 mA
