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Differential GPS positioning method and system

A GPS positioning and differential technology, applied in the field of GPS positioning, can solve problems such as inability to perform accurate positioning

Active Publication Date: 2011-08-03
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] Since the current pseudo-range differential technology relies on a reference station whose position is precisely known, when there is no such reference station in the effective area or the equipment cannot receive the correction data of the reference station, accurate positioning cannot be performed

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  • Differential GPS positioning method and system
  • Differential GPS positioning method and system

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Embodiment Construction

[0079] Such as Figure 4 As shown, the differential GPS positioning system 100 of the present invention includes a plurality of user terminals 21 , a communication network 22 and a location server 23 . Each user terminal 21 has an A-GPS function, and can receive GPS satellite signals and perform measurements according to the A-GPS procedure. In the effective area of ​​differential GPS, the visible satellites 200 of all user terminals 0-N1 are consistent, let them be M, respectively denoted as 0, 1, . . . , (M-1). Each satellite 200 transmits a GPS signal to each user terminal for measurement.

[0080] Suppose the position of any satellite i in M ​​satellites is known as X i =(x i ,y i ,z i ), where j ∈ {0, 1...(M-1)}. And set the position of the user terminal k to be located as Y k =(x k ,y k ,z k )unknown. Then the transmission delay of user terminal k measuring satellite i signal is T ki , where the perturbation τ for fixed satellite i i It is an unknown fixed v...

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Abstract

The invention discloses a positioning method and system of differential GPS. The measurement results of M visible GPS satellites together concluded by a plurality of mobile user terminals with the function of A-GPS in the effective area of the differential GPS are used for jointly estimating the position of each user terminal and the differential information. The method includes the following steps: each user terminal receives relevant GPS information from a receiver and independently measures a visible satellite signal; each user terminal submits the measurement result to a server; the server divides the user terminals according to a plurality of effective areas of the differential GPS; aiming at different division areas, the server selects the joint information of N user terminals in the same area to calculate the position and differential information of each terminal; and the server informs the user of the position information of the user terminal.

Description

technical field [0001] The invention relates to GPS positioning technology, in particular to a differential GPS positioning method and device. Background technique [0002] GPS is a satellite-based positioning system that was originally designed and controlled by the U.S. military and is free for anyone to use. This system is composed of 24 satellites operating in 6 intermediate circular orbits, and the time for one satellite to circle the orbit is close to 12 hours. Each satellite is constantly sending information about the current time, the positions of all satellites, and some related data like almanac and ephemeris. A GPS receiver uses this information to calculate the distance between itself and the satellites. GPS positioning is realized by using observations such as the pseudorange, ephemeris, and satellite launch time of a group of satellites, and the user's clock error must also be known. Therefore, to obtain the 3D coordinates of a ground point, measurements mus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/14G01S19/07
Inventor 吴涛
Owner SPREADTRUM COMM (SHANGHAI) CO LTD