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DSM 132/132RS Receiver User Guide 133
Specifications E
E.3 GPS Channels
Table E.3 lists the performance characteristics of GPS channels.
E.4 Beacon Channels
Table E.4 lists the characteristics of the beacon channels.
Table E.3 GPS channels performance characteristics
General 12-channel, parallel tracking L1 1571.42 MHz C/A code and carrier
phase filtered measurements and multi-bit digitizer
Update rate Selectable 1, 2, 5, or 10 Hz output rate)
Differential speed
accuracy
0.16 kph (0.1 mph)
Differential position
accuracy
Less than 1 m horizontal RMS if all the following criteria are met;
At least 5 satellites,
PDOP < 4
RTCM SC-104
Standard format broadcast from a Trimble DSM 132RS or
equivalent reference station
Time to first fix < 30 seconds, typical
NMEA messages GGA,
1
GLL, GSR, GSA
1
, GST, GSV, MSS, PTNLDG, PTNL,
PTNLEV, PTNLID, PTNLSM, RMC
1
, VTG
1
, XTE, ZDA
1
By default, the receiver is configured to output GGA, GSA, RMC, and VTG messages at an 1 Hz (1
position/second) update rate.
Table E.4 Beacon Channels
Frequency range 283.5 kHz to 325.0 kHz
Channel Spacing 500 Hz
Beacon modulation 50, 100, and 200 bits/second
Signal strength 10 µV/meter minimum
Dynamic range 100 dB
Channel selectivity 70 dB @ > 500 Hz offset