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Continuous tracing and positioning method for global positioning system receiver in signal lack condition

A technology of global positioning system and signal loss, which is applied in the field of continuous positioning and can solve the problem that the receiver cannot receive the GPS signal.

Inactive Publication Date: 2009-05-13
中科集成资产管理(北京)有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Driving vehicles often encounter obstacles such as bridges, buildings, tunnels, etc., so that the receiver cannot receive GPS signals with sufficient signal-to-noise ratio

Method used

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  • Continuous tracing and positioning method for global positioning system receiver in signal lack condition
  • Continuous tracing and positioning method for global positioning system receiver in signal lack condition
  • Continuous tracing and positioning method for global positioning system receiver in signal lack condition

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0029] The GPS baseband chip is the baseband signal processing chip in the GPS receiver, and is the core of the entire GPS receiver. Various methods of the present invention are all implemented in the GPS baseband chip. For convenience, "receiver" in the present invention refers to "GPS baseband chip".

[0030] figure 1 Described is a block diagram of the hardware structure of a preferred embodiment of the present invention. This is a complete GPS receiver, including an antenna 101 , a radio frequency front-end chip 102 , a baseband processing chip 103 and an external crystal oscillator 104 . In this embodiment, the radio frequency front end and the baseband processing are independently packaged into chips. Another em...

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Abstract

The invention discloses a continuous tracking and positioning method in the case of signal absence of a GPS receiver, and relates to the global satellite positioning and navigation field, such as GPS. In the method , certain data used for tracking and positioning are recorded in a normal tracking and positioning state, when the signal is temporarily absent, the continuous satellite tracking and continuous positioning are realized by the data and a pseudo tracking loop, and the normal tracking and positioning method is performed after the signal is recovered. The pseudo tracking and positioning method in the signal absence condition is applicable to the baseband processing chip of any types of GPS receivers, can greatly enhance robustness and starting and positioning speeds of the receiver, and has the advantages of simple structure, low chip area overhead, low cost and convenient transplantation.

Description

technical field [0001] The invention relates to the field of global satellite positioning and navigation, such as the GPS system, in particular to a method for realizing continuous tracking and then continuous positioning in the absence of GPS signals. Background technique [0002] Global satellite positioning and navigation systems, such as the United States' Global Positioning System (GPS), consist of a constellation of satellites (also known as Navstar satellites) that transmit GPS signals that can be used by a receiver to determine the receiver's Location. Satellite orbits are arranged in multiple planes so that the signal can be received from at least four satellites at any location on Earth. More typically, the signal is received from more than six satellites in most places on Earth. [0003] The GPS signal transmitted by each GPS satellite is a direct sequence spread spectrum signal. The commercially used signal is associated with the Standard Positioning Service (...

Claims

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Application Information

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IPC IPC(8): G01S5/02G01S5/14
Inventor 李金海陈杰郑睿
Owner 中科集成资产管理(北京)有限责任公司
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