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Method for optimising an acquisition of a spread-spectrum signal from a satellite by a mobile receiver

A mobile receiver, spread spectrum signal technology, applied in satellite radio beacon positioning system, navigation through velocity/acceleration measurement, measurement device and other directions, can solve problems such as invalid integration

Inactive Publication Date: 2011-10-05
THALES SA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During long coherent integration, the Doppler effect associated with the movement of the user causes the actual received frequency to vary during said integration, which invalidates the integration if integrated against the assumption of stability

Method used

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  • Method for optimising an acquisition of a spread-spectrum signal from a satellite by a mobile receiver
  • Method for optimising an acquisition of a spread-spectrum signal from a satellite by a mobile receiver
  • Method for optimising an acquisition of a spread-spectrum signal from a satellite by a mobile receiver

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Embodiment Construction

[0030] figure 1 The structure shown in includes: a device 10 for receiving radio frequency signals transmitted by a satellite; a device 11 for capturing the received signal to determine a pseudo-random spreading code to modulate the signal originating from the satellite; device 12, It is used to track the signal so that it can compensate the dynamics of the receiver; the device 13 is used to calculate the position of the receiver. Moreover, the structure includes an inertial sensor 14 for sending information related to the speed and attitude of the receiver relative to the satellite after processing by the processing device 15.

[0031] figure 2 The vertical axis of the graph corresponds to the frequency assumptions to be detected, and the horizontal axis corresponds to the integration time. The frequency to be detected is assumed to be between the minimum frequency related to the minimum Doppler effect and the maximum frequency related to the maximum Doppler effect. The time a...

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Abstract

The invention relates to a method for optimising the acquisition phase of a spread-spectrum by a mobile receiver. The method comprises searching for the path having the maximum energy for different frequency hypotheses and among all the possible evolution paths of said frequencies between two initial and final instants marking the beginning and the end of a coherent signal integration. The invention can particularly be used for satellite global navigation systems of the GPS (Global Positioning System), Galileo, or Glonass type.

Description

Technical field [0001] The present invention relates to a method for optimizing the process of capturing spread spectrum signals realized by a mobile receiver. The present invention is applied to any navigation signal derived from GPS (Global Positioning System), Galileo type satellite global navigation system, for example. Background technique [0002] The expression "mobile receiver" is here understood to include: a device (or receiver) dedicated to satellite positioning, which may be portable or installed in a land, sea or air carrier; and a communication terminal equipped with a satellite positioning device , Such as possible types of communication such as mobile phones or laptops or personal digital assistants (PDAs). [0003] In a satellite positioning system using a GNSS (Global Navigation Satellite System) type receiver, the data signal enables the receiver to be subordinated to different satellites of the constellation of positioning satellites (at least four to determine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/26H04B1/707
CPCH04B1/7075H04B2201/70715G01S19/26G01S19/29G01C21/16
Inventor D·库布拉克M·蒙内拉特L·里斯G·阿尔托
Owner THALES SA