Un-differential correction distributed processing system and method based on receiver of reference station

An un-differential correction distributed processing method, comprising:

• performing a calculation of un-differential real ambiguity, an un-differential ambiguity fixing calculation, a calculation of real-time un-differential correction of each satellite, and data interaction with a client end in receivers of a plurality of area reference stations of a global navigation satellite system (GNSS), wherein, the method further comprises:
• (41) performing information interaction between a precise orbit clock offset server and the area reference stations, which comprises sending a real-time precise ephemeris to the area reference stations by the precise orbit clock offset server;
• (42) performing information interaction between a phase fraction estimating server and the area reference stations, which comprises sending a calculated un-differential real ambiguity back to the phase fraction estimating server by the area reference stations, calculating a phase fraction part by the phase fraction estimating server according to the un-differential real ambiguity, and sending the phase fraction part to the area reference stations;
• (43) performing information interaction between a reference station area code address server and the client end, which comprises visiting the reference station area code address server by the client end so as to obtain a reference station area code address list matching nearest area reference stations forming a triangle from the plurality of area reference stations by use of the reference station area code address list;
• and
• (44) performing information interaction between the area reference stations and the client end, which comprises connecting the client end to the nearest reference stations forming the triangle so as to obtain a real-time precise orbit, a clock offset and the real-time un-differential correction, and performing a precise point positioning-real time kinematic (PPP-RTK) calculation by the client end;
• wherein the step of performing information interaction between the phase fraction estimating server and the one area reference station further comprises:
• (42.1) calculating the un-differential real ambiguity by some or all of the area reference stations according to observation data of the area reference stations themselves, and sending the un-differential real ambiguity to the phase fraction estimating server;
• (42.2) obtaining the phase fraction part of each satellite by the phase fraction estimating server according to the un-differential real ambiguity, and sending the phase fraction parts to receivers of all of the area reference stations;
• (42.3) performing a precise point positioning (PPP) un-differential ambiguity fixing calculation independently in the receivers of the area reference stations according to the phase fraction parts;
• (42.4) calculating the real-time un-differential correction of each satellite in the receivers of the area reference stations according to the precise ephemeris and the phase fraction part after a PPP un-differential ambiguity of the area reference stations is fixed;
• and
• (42.5) storing the real-time un-differential correction of each satellite in a cache of the receiver of the area reference stations by the area reference stations.

A real-time un-differential correction generating system, comprising:

• a plurality of area reference stations of a global navigation satellite system (GNSS);
• a precise orbit clock offset server configured to provide each of the plurality of area reference stations with a precise ephemeris;
• and
• a phase fraction estimating server configured to calculate a corresponding phase fraction part according an un-differential real ambiguity calculated by a certain one of the plurality of area reference stations the un-differential real ambiguity and send the corresponding phase fraction part to the receiver of the certain one of the plurality of area reference stations;
• wherein each of the area reference stations is configured to perform calculation of the un-differential real ambiguity according to its own observation data, and to perform calculation of real-time un-differential correction of a satellite according to the precise ephemeris and the phase fraction part.