초록 ▼

A method for enhancing the accuracy of location coordinates and/or clock bias computed for a mobile user station that is part of a Satellite Positioning System (SATPS), such as GPS or GLONASS. A data processing station is provided with pseudorange corrections PRC(t;j;ref) for an SATPS reference stat

A method for enhancing the accuracy of location coordinates and/or clock bias computed for a mobile user station that is part of a Satellite Positioning System (SATPS), such as GPS or GLONASS. A data processing station is provided with pseudorange corrections PRC(t;j;ref) for an SATPS reference station for each of M SATPS satellites (j=1, . . . , M; M≥3) and with uncorrected location fix coordinates x′(tf), y′(tf)′, z′(tf)′and/or b′(tf) for the mobile station for a selected location fix time tf. A matrix equation H(tf;mob)Df;mob)=PRC(tf;ref) relates a matrix Df;mob) is an M×N matrix (M≤N; N=3 or 4) with known entries computed from mobile station data. An inverse or pseudo-inverse matrix H(tf;mob)(-1) is formed satisfying the relation H(tf;mob)(-1)H(tf;mob)=the identity matrix I, and the matrix Df;mob)=H(tf;mob)(-1)PRC(tf;ref) is computed. The entries of the matrix Df) are interpreted as additive corrections for the location fix coordinates x′(tf), y′(tf)′, z′(tf)′and/or b′(tf) for the mobile station. Post-processing can be performed to apply the pseudorange corrections to the mobile station data.

대표청구항 ▼

A method for determining spatial location and clock bias coordinates with enhanced accuracy for a mobile user Satellite Positioning System (SATPS) station, the method comprising the steps of: providing pseudorange corrections PRC(tf;j;ref) for uncorrected pseudorange values PR(tf;j;ref), measured at

A method for determining spatial location and clock bias coordinates with enhanced accuracy for a mobile user Satellite Positioning System (SATPS) station, the method comprising the steps of: providing pseudorange corrections PRC(tf;j;ref) for uncorrected pseudorange values PR(tf;j;ref), measured at an SATPS reference station that has location coordinates that are known with high accuracy and that receives SATPS signals at a selected location fix time t=tf from each of M SATPS satellites, numbered j=1, 2, . . . , M (M>4), where the sums PR(tf;j;ref)+PRC(tf;j;ref) for j=1, 2, . . . , M provide corrected reference station pseudorange values PR(tf;j;ref)cor that agree with known pseudorange values for the reference station for the M SATPS satellites for the location fix time tf; providing an SATPS mobile station that has an SATPS signal antenna and associated SATPS signal receiver/processor, and causing the mobile station to receive and process SATPS signals from each of the M SATPS satellites and to determine uncorrected location fix coordinates, including uncorrected three-dimensional spatial location coordinates (x′(tf),y′(tf),z′(tf)) and uncorrected clock bias coordinate b′(tf), for the mobile station for the location fix time tf; providing a supplemental data processor with the location fix time tf, with the mobile station uncorrected location fix coordinates (x′(tf), y′(tf), z′(tf), b′(tf)), with spatial coordinate values (xj(tf), yj(tf), zj(tf)) of SATPS satellite number j for a time corresponding to the location fix time tf, and with the reference station pseudorange corrections PRC(tf;j;ref) for j=1, 2, . . . , M; computing at the supplemental data processor an M×4 matrix H(tf;mob) whose entries are defined by the relations H(tf;mob)=(hji(tf)), hj1(tf)=aj1(tf)=(x′(tf)-xj(tf))/r0j(tf), hj2(tf)=aj2(tf)=(y′(tf)-yj(tf))/r0j(tf), hj3(tf)=aj3(tf)=(z′(tf)-zj(tf))/r0j(tf), hj4(tf)=1, (j=1, 2, . . . , M), r0j(tf)=[(x′(tf)-xj(tf))2+(y′(tf)-yj(tf))2+(z′(tf)-zj(tf))2]1/2; forming a 4×M matrix H(tf;mob)Lf;mob)Lf;mob)=I, where I is the 4×4 identity matrix; forming a matrix Df;mob)=H(tf;mob)Lf;ref), where PRC(tf;ref) is an M×1 matrix whose entries are the values PRC(tf;j;ref) for j=1, 2, . . . , M; interpreting four entries D1(tf), D2(tf), D3(tf), and D4(tf) of the matrix Df;mob) as corrections to the location fix coordinates for the mobile station; and determining corrected location fix coordinates (x(tf),y(tf),z(tf),b(tf)) for the mobile station for at least one time t=tfusing the relations x(tf)=x′(tf)+Dw1(tf), y(tf)=y′(tf)+Dw2(tf), z(tf)=z′(tf)+Dw3(tf), b(tf)=b′(tf)+Dw4(tf).