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Sbas correction information in ms based agps system

A technology for correcting data and enhancing the system. It is applied in the direction of radio wave measurement system, satellite radio beacon positioning system, beacon transmitter, etc. It can solve the problems of ambiguity and lack of support for SBAS information format, and achieve the goal of enhancing accuracy. Effect

Inactive Publication Date: 2009-12-02
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for MS-based AGPS, it is unclear how to use SBAS information directly
Currently, there is no supported format for SBAS messages in existing cellular standards, and likely won't be in the foreseeable future

Method used

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  • Sbas correction information in ms based agps system
  • Sbas correction information in ms based agps system
  • Sbas correction information in ms based agps system

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0034] This description begins with a brief introduction to the different types of GPS-related positioning methods. figure 1 An embodiment of a generic stand-alone GPS system 1 is shown.

[0035]The GPS system 1 comprises approximately 27 satellites or spacecraft (SV) 10 orbiting the Earth 5 at a 12-hour period at an altitude of 20,000 km. Since SV10 is traveling at 3.8 km / s, the Doppler shift experienced on the surface of Earth 5 is very noticeable. The SV10 transmits a synchronous CDMA ranging signal 12 on the L1 frequency band (1575.42MHz) featuring a C / A code that is unique to each SV10. The C / A code is a known sequence of -1 and +1 values ​​converted at a rate of 1.023MHz. The C / A code repeats itself every 1 millisecond, ie its length is 1023 chips. Superimposed on the C / A code is a sequence of -1 and +1 values ​​converted at a rate of 20 milliseconds containing frames of navigation data. The navigation data represents a model describing the SV10 orbit and clock model...

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PUM

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Abstract

A method for providing a mobile station, being connected to a wireless communication system, with GPS assistance data, comprises obtaining (210) of correction data of a satellite based augmentation system. The method further comprises obtaining (220) of assistance data of an assisted global positioning system. Modified values of standard parameters of either assistance data of the assisted global positioning system or correction data of differential global positioning system, or both, are determined (230) from the correction data of the satellite based augmentation system in dependence on the assistance data of the assisted global positioning system. The modified values of the standard parameters are transmitted (240) from the core network to the mobile station. A node implementing the method and a system comprising such a node are also presented.

Description

technical field [0001] The present invention generally relates to positioning in a wireless communication system, and more particularly to GPS-based positioning in a wireless communication system. Background technique [0002] In many fields of application, the determination of the geographical position of an object, a device or a person carrying the device is of increasing interest. Especially in the field of wireless communication. One method of positioning is to use signals transmitted from satellites to determine position. Known examples of such systems are the Global Positioning System (GPS) and the Global Navigation Satellite System (GLONASS). The position is given according to a specific coordinate system such as triangulation based on a plurality of received satellite signals. [0003] In conventional GPS, a spacecraft (SV) transmits a synchronous CDMA ranging signal characterized by a C / A (Coarse / Acquisition) code, where the C / A code repeats itself every 1 millis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S1/00G01S5/02G01S19/07G01S19/11G01S19/12
CPCG01S19/05G01S19/12G01S19/07G01S19/11G01S19/25
Inventor A·坎加斯
Owner TELEFON AB LM ERICSSON (PUBL)