Integrity monitoring of differential satellite positioning system signals

摘要: Methods for determining the integrity of pseudorange and rate signals received from a plurality M Satellite Positioning System satellites (SATPS, including GPS GLONASS), numbered j=j1, j2, . , jM, at reference SATPS station (RS), using same signal monitoring (SIM) located near station. Pseudorange correction values PRC(t;i;j) RS SIM PRRC(t;i;j) (RS, number i) are computed, difference DPRE(t;i;j)=PRC(t;i;j) -PRC(t;i;j) DRRE(t;i;j)=PRRC(t;i;j) -PRRC(t;i;j) computed these values. If |DPRE(t;i;j)|≦DPRE(i;j) thr |DPRRE(i;j)|≦DPRRE(i;j) where DPRE(i;j) DPRRE(i;j) selected threshold satellite (j), corrections and/or that acceptable can be used by mobile to differentially improve accuracy location coordinates velocity least one pair DPRE(t;i;j) DPRRE(t;i;j) is found, particular j, clock bias frequency offset corrected two pairs acceptable, j1 parameters monitored satellites. three (for distinct satellites), those satellites, if precise provided; otherwise, four required.