gps usb modem

gps usb modem

An OEM Module with SiRF Start III chipset and a built-in Antenna  

1. SiRF starIII high performance GPS Chip Set 

2. Very high sensitivity (Tracking Sensitivity: -159 dBm) 

3. Extremely fast TTFF (Time To First Fix) at low signal level 

4. Support NMEA 0183 data protocol 

5. Built-in SuperCap to reserve system data for rapid satellite acquisition 

6. Built-in patch antenna 

7. LED indicator for GPS fix or not fix 

    LED OFF: Receiver switch off 

    LED ON:No fixed, Signal searching 

    LED Flashing:Position Fixed

Features:
SiRF starIII high performance GPS Chip Set
Very high sensitivity (Tracking Sensitivity: -159 dBm)
Extremely fast TTFF (Time To First Fix) at low signal level
Support NMEA 0183 data protocol
Built-in SuperCap to reserve system data for rapid satellite acquisition
Built-in patch antenna
LED indicator for GPS fix or not fix
LED OFF: Receiver switch off
LED ON: No fixed, Signal searching
LED Flashing: Position Fixed
Specification:
General
Chipset SiRF Star III
Frequency L1, 1575.42 MHz
C/A code 1.023 MHz chip rate
Channels 20 channel all-in-view tracking
Sensitivity -159 dBm
Accuracy
Position 10 meters, 2D RMS
5 meters, 2D RMS, WAAS enabled
Velocity 0.1 m/s
Time 1us synchronized to GPS time
Datum
Default WGS-84
Acquisition Time
Reacquisition 0.1 sec., average
Hot start 1 sec., average
Warm start 38 sec., average
Cold start 42 sec., average
Dynamic Conditions
Altitude 18,000 meters (60,000 feet) max
Velocity 515 meters /second (1000 knots) max
Acceleration Less than 4g
Jerk 20m/sec **3
Power
Main power input 4.5V ~ 6.5V DC input
Power consumption 60mA
Protocol
Electrical level TTL level, Output voltage level: 0V ~ 2.85V
RS-232 level
Baud rate 4,800 bps
Output message NMEA 0183 GGA, GSA, GSV, RMC, VTG, GLL
Physical Characteristics
Dimension 30mm*30mm*10.5mm ±0.2mm
Operating temperature -40  to +85

* VIN (DC power input):
This is the main DC supply for a 4.5V ~6.5 DC input power.
* TX:
This is the main transmits channel for outputting navigation and measurement
data to user's navigation software or user written software.
* RX:
This is the main receive channel for receiving software commands to the engine
board from SiRFdemo software or from user written software.
* GND:
GND provides the ground for the engine board. Connect all grounds.