Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1997-10-20
2000-01-11
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
34235706, 701214, G01S 502
Patent
active
060141018
ABSTRACT:
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.gtoreq.3) and with uncorrected location fix coordinates x'(t.sub.f), y'(t.sub.f)', z'(t.sub.f)' and/or b'(t.sub.f) for the mobile station for a selected location fix time t.sub.f. A matrix equation H(t.sub.f ;mob).DELTA.W(t.sub.f ;mob)=PRC(t.sub.f ;ref) relates a matrix .DELTA.W of location fix coordinate corrections for the mobile station to a matrix PRC(t;ref) of the pseudorange correction values, where H(t.sub.f ;mob) is an M.times.N matrix (M.ltoreq.N; N=3 or 4) with known entries computed from mobile station data. An inverse or pseudo-inverse matrix H(t.sub.f ;mob).sup.(-1) is formed satisfying the relation H(t.sub.f ;mob).sup.(-1) H(t.sub.f ;mob)=the identity matrix I, and the matrix .DELTA.W(t.sub.f ;mob)=H(t.sub.f ;mob).sup.(-1) PRC(t.sub.f ;ref) is computed. The entries of the matrix .DELTA.W(t.sub.f) are interpreted as additive corrections for the location fix coordinates x'(t.sub.f), y'(t.sub.f)', z'(t.sub.f)' and/or b'(t.sub.f) for the mobile station. Post-processing can be performed to apply the pseudorange corrections to the mobile station data.
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Phan Dao L.
Schipper John F.
Tarcza Thomas H.
Trimble Navigation Limited
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