Geotech Instruments, LLC

Global Positioning System

Model GPS-2

line

  • Six-channel Trimble™ GPS receiver
  • One pulse per second output
  • Position to 25 meters spherical error


The Geotech Instruments Model GPS-2 is a high-performance six-channel GPS receiver and antenna integrated into a compact, weatherproof housing. The GPS-2 provides position, velocity, and time information to a high degree of accuracy. The antenna can be 25 m away from the Control Box. The Control Box has two independent serial ports to synchronize two different instruments situated up to 100 m from the Box.

Applications include portable and permanent seismic stations and all systems requiring a low-cost, low-power, all-weather synchronized time and position source.




TECHNICAL SPECIFICATIONS

ACCURACY

1 PPS


Position

Datum
Velocity

 - 1 microseconds; a dwell time of 2-3 minutes after satellite lock-on is needed before the 1 pps is within the specifications
- 25 meters spherical error probability (SEP), 100 meters if Selective Availability is selected
- WGS-84
- 0.02 m/s with Selective Availability

INTERFACE

Type
Baud rate
Data bits
Stop bits
Parity

 - Serial, RS-232
- 300, 1200, 2400, 4800, and 9600 baud
- 7 or 8
- 1 or 2
- None, odd or even

POWER REQUIREMENTS

Operating voltage
Power

 - 9 to 18V dc
- 1 watts, typical

ENVIRONMENTAL CHARACTERISTICS

Operating temperature
Storage temperature
Humidity

 - -40 ºC to ±85 ºC
- -55 ºC to ±100 ºC
- 0 to 100%, condensing

PHYSICAL CHARACTERISTICS

Dimensions



Weight

 - Antenna: 7.7 cm diameter x 7.5cm high (3 in x 3 in)
¾ in PNT female spigot on bottom surface for mounting
- Control Box: 11.4 cm x 8.9 cm x 15.2 cm
(4.5 in x 3.5 in x 6 in)
- Antenna: 0.4 Kg, Control Box: 0.8 Kg
 

line