GEOG 862
GPS and GNSS for Geospatial Professionals

Mapping Receivers

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Generalized Values for Mapping Receivers
Mapping Receivers Autonomous
Horizontal
Precision
Real-time
Corrected
Horizontal
Network
Accuracy
Post-processed
Horizontal
Network
Accuracy
Mapping (L1 Code) 2 - 10m 0.5 - 5m 0.3 - 15m
Mapping (L1 Code & Carrier) 2 - 10m 0.5 - 3m 0.2 - 1m
Mapping (L1 Code & Carrier + L2 Carrier) 2 - 10m 0.5 - 3m 0.02 - 0.9m
Mapping (GPS + GLONASS) 2 - 10m N/A 0.02 - 0.9m
Source: GPS for Land Surveyors

Mapping Receivers

These receivers are generally defined as those that allow user to configure some settings such as PDOP, SNR, elevation mask and the logging rate. They most often have an integrated antenna and CDU in the receiver. They generally record pseudoranges and also can log data suitable for differential corrections either in real-time or for post-processing; many record carrier data.

Mapping receivers are often capable of storing mapped features (coordinates and attributes) and usually have adequate capacity for mapping applications. This memory is required for differential GPS, DGPS receivers, even those that track only the C/A code. For many applications, a receiver must be capable of collecting the same information as is simultaneously collected at a base station, and storing it for postprocessing. Receivers typically depend on proprietary post-processing software which also includes utilities to enable GPS data to be transferred to a PC and exported in standard GIS file format(s) either over a cable or a wireless connection. Some mapping grade receivers for spatial data collection are single frequency, L1, with code only or both code and carrier.

Most mapping grade receivers of all tracking configurations are WAAS (or other Satellite Based Augmentation Signal SBAS) enabled, and thereby offer real-time results. Such differentially corrected mapping receivers may be capable of achieving a network accuracy of ~0.5 to 5 meters.

Positions of sub-meter post-processed network accuracy can be achieved with mapping grade receivers that have the following configurations: L1 Code & Carrier, L1 Code & Carrier + L2 and L1 Code & Carrier + L2 (GPS and GLONASS). As noted, some mapping receivers offer tracking of the Global Navigation Satellite System, GNSS, constellations, including, for example, both GPS and GLONASS.