Appendix H: Lassen SK8 Technical Specifications [17]

Picture of GPS Lassen Receiver

Performance Specifications

General: L1 frequency, C/A code (SPS), 8-channel, continuous tracking receiver, 32 correlators
Update rate: TSIP @ 1 Hz; NMEA @ 1 Hz
Accuracy: Position: 25 m CEP (50%) without SA, Velocity: 0.1 m/sec without SA
Time: +/- 500 nano-seconds (nominal)
DGPS accuracy: Position: 2 m CEP (50%),Velocity: 0.05 m/s, Time: ±500 nano-seconds (nominal)
Acquisition: Cold start: <2 minutes (90%), Warm start: <45 seconds (90%)
(typical) Hot start: <20 seconds (90%)
Cold start requires no initialization.
Warm start implies last position, time and almanac are saved by back-up power.
Hot start implies ephemeris also saved.
Reacquisition after signal loss: < 2 seconds (90%)
Dynamics: Altitude: -1000 m to +18,000 m, Velocity: 515 m/sec maximum
Acceleration: 4g (39.2 m/sec 2 ), Motional Jerk: 20m/sec3

Environmental Specifications

Operating temp: -10°C to +60°C (standard), 40°C to +85 C (optional)
Storage temp: -55 C to +100 C
Vibration: 0.008g2/Hz 5 Hz to 20 Hz, 0.05g2/Hz 20 Hz to 100 Hz
-3dB/octave 100 Hz to 900 Hz
Operating humidity: 5% to 95% R.H. non-condensing @ +60 C
Altitude: -400 m to +18,000 m

Physical Characteristics

Prime power: +5 volts DC,+/-5%
Power consumption (nominal): GPS board only: 150 ma, 0.75 watts, With antenna: 175 ma, 0.88 watts
Back-up power: +3.2 to +5 volts DC 2 micro-amp @ +3.5 volts, +25 C (nominal)
Serial ports/1PPS: CMOS TTL levels
Protocols: TSIP @ 9600 baud, 8-O-1, NMEA 0183 v2.1 @ 4800 baud
8-N-1 RTCM SC-104 @ 4800 baud, 8-None-1
NMEA messages: GGA, VTG, GLL, ZDA, GSV, GSA and
RMC messages selectable by TSIP command;
selection stored in non volatile memory
Antenna power: 5V at 25mA available Short circuit protection Feedline fault detection
Dimensions: without connectors 3.25" L x 1.25" W x 0.40" H (82.6 mm x 31.2 mm x 10.2 mm)
with connectors and optional shield 3.29" L x 1.30" W x 0.52" H (83.6 mm x 33.0 mm x 13.2 mm)
Weight: 0.7 oz. (19.6 g) without optional shield
1.3 oz. (36.4 g) with optional shield
Connectors: RF:SMB; I/O:8-pin(2x4), 0.100"header

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