Network for carrier phase differential GPS corrections
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04B-007/24
G01S-005/22
출원번호
US-0177011
(1994-01-03)
발명자
/ 주소
Loomis Peter V. W. (Sunnyvale CA)
출원인 / 주소
Trimble Navigation Limited (Sunnyvale CA 02)
인용정보
피인용 횟수 :
135인용 특허 :
0
초록▼
Method and apparatus for providing GPS pseudorange correction information over a selected geographic region S with a diameter of up to 3000 km with an associated inaccuracy no greater than 5 cm. N spaced apart GPS fiducial stations (N≥3), whose location coordinates (un, vn, vn) are fixed and are kno
Method and apparatus for providing GPS pseudorange correction information over a selected geographic region S with a diameter of up to 3000 km with an associated inaccuracy no greater than 5 cm. N spaced apart GPS fiducial stations (N≥3), whose location coordinates (un, vn, vn) are fixed and are known with high accuracy, are provided within or adjacent to the region R. Each fiducial station n (n=1, 2, . . . , N) receives GPS signals from at least four common-view GPS satellites, numbered m=1, 2, . . . , M (M≥3), computes its own GPS-determined location coordinates, compares these coordinates with its known location coordinates determines the pseudorange corrections PRC(t;t0;m;n) for its GPS-determined location, and transmits these correction signals to a central station located within or adjacent to the region S. The central station retransmits the pseudorange correction signals throughout the region S. A mobile GPS station within or adjacent to the region S has stored within its coordinates (u′, v′, w′) of the GPS determined last location of that mobile station and the spatial coordinates (un(k), vn(k), wn(k)) (k=1, 2, . . . , K; K≥3) of K GPS fiducial stations within S that are closest to the last determined location of that mobile station. The mobile station then computes the differential GPS corrections for the GPS- determined present location of that mobile station. Alternatively, the fiducial stations can transmit to the central station unprocessed GPS signals for determination of the pseudorange correction signals at the central station. This approach can be modified it the region S is two-dimensional, where only one coordinate u is needed.
대표청구항▼
A method of providing GPS pseudorange and carrier phase correction information over a selected geographic region S with a diameter of up to about 3000 km with an associated inaccuracy as low as 5 cm, to provide increased accuracy for a GPS user in moving from a first selected location A to a second
A method of providing GPS pseudorange and carrier phase correction information over a selected geographic region S with a diameter of up to about 3000 km with an associated inaccuracy as low as 5 cm, to provide increased accuracy for a GPS user in moving from a first selected location A to a second selected location B, the method comprising the steps of: (1) providing N spaced apart GPS fiducial stations, numbered n=1, 2, . . . , N (N≥3), whose location coordinates (un,vn,wn) in a selected coordinate system are fixed and known with high accuracy, within the region S; (2) causing each fiducial station to receive GPS information signals including pseudorange information and carrier phase information from M GPS satellites, numbered m=1, 2, . . . , M (M≥3), to compute the GPS-determined location of that fiducial station, to compute pseudorange corrections PRC(t;t0;m;n) at a selected time t0, which are valid for times t≥t0 that are near t0 and which reconcile the GPS-determined location with the known location of fiducial station number n using GPS signals received from satellite number m, to compute cumulative carrier phase correction signals c0;m;n) corresponding to receipt at fiducial station number n of GPS carrier phase information from satellite number m, and to broadcast these pseudorange correction signals and carrier phase correction signals; (3) providing a GPS user with a mobile GPS station within the region S, which has stored within the station the coordinates (u′,v′,w′) of an estimated present location vector u′of that mobile station and the spatial coordinates (un(k), vn(k), wn(k)) (k=1, 2, . . . , K; K≥3) of K GPS fiducial stations with corresponding location vectors un(k) within S that form a bounding polygon for the estimated present location of that mobile station, where the mobile station receives at least one of (i) a set of pseudorange signals PR(t;t0;m;mobile) and (ii) a set of carrier phase signals F0;m;mobile) from the GPS satellites and receives at least one of (i) a set of pseudorange correction signals PRC(t;t0;m;n) (m=1, . . . , M) and (ii) a set of carrier phase correction signals c0;m;n) from the fiducial stations number n=n(k) (k=1,2, . . . , K), where the GPS user is to move from a first selected location A to a second selected location B; (4) selecting coefficients ak′that minimizes the norm of the vector difference [Figure] under the constraint a1′+a2′+. . . +aK′=1, with -0.5≤ak′≤1.5, for a selected number p>0; (5) determining at least one of (1) a set of pseudorange corrections and for that mobile station at its present location by the relations [Figure] and (2) a set of carrier phase correction signals for that mobile station at its present location by the relations [Figure] (6) computing at least one of (1) a set of corrected pseudorange signals for this mobile station, using the relations PR(t;t0;m;mobile;corr)= =PR(t;t0;m;mobile)+PRC(t;t0;m;mobile) and (2) a set of corrected carrier phase signals FFt;t0;m;mobile;corr)= =Ft;t0;m;mobile)+ct;t0;m;mobile); (7) using at least one of (1) the set of corrected pseudorange signals PR(t;t0;m;mobile;corr) and (2) the set of corrected carrier phase signals F0;m;mobile;corr) to determine a corrected present location of this mobile station and to replace the estimated present location by the corrected present location of this mobile station; and (8) displaying at least one corrected present location of this mobile station for an estimated mobile station location that is distinct from the locations A and B.
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