• Overview
  • Specification


The UD-731 (GPS receiver) is a compact all-in-one GPS receiver that continuously tracks all satellites in view and provides accurate satellite positioning data. Its 50 parallel channels and 2 millon correlators provide fast satellite signal acquisition and short start-up time. Acquisition sensitivity of -148dBm and tracking sensitivity of -162 dBm offer good performance even under difficult environments.

The UD-731 (GPS receiver) is optimized for applications requiring good performance and low cost; it is suitable for a wide range of handhelds, asset tracking, Notebook, PDA-centric personal navigation system, and vehicle navigation products.

  • 50 channel to acquire and track satellites simultaneously
  • Capable of keeping up to 100,000 positions(Longitude,Latitude,Speed,UTC )
  • Industry-leading TTFF speed
  • Signal detection better than -160 dBm
  • SBAS (WAAS/EGNOS) capable
  • Cold start < 29seconds
  • Hot start < 1second
  • Accuracy 2.5m CEP
  • USB Interface
  • Easy-plug-in Notebook
  • SIZE:78.62mmL X 24.83mmW X 11.15mmH
  • RoHS compliance


Receiver Type 50 channels
Re-acquisition sensitivity -148dBm
Tracking sensitivity -160dBm
Cold start sensitivity -148dBm
Receiver frequency 1575.42MHz
Code C/A code
Accuracy (1) Position    2.5m CEP

Startup Time

hot start

cold start


< 1sec

< 26sec

Update Rate 1Hz

Operational Limits

(1) Altitude

(2) velocity


< 50,000m

< 500m/s

Dynamics 4G (39.2m/sec2)
Datum WGS-84
Protocol NMEA-0183 V2.3
Serial Interface USB interface
Input Voltage 5V ±5%
Power Consumption 65mW
Connector USB B-type 4P male