Rapidly recapturing and positioning method under receiver signal deletion condition of global positioning system

A global positioning system and signal loss technology, applied in the field of fast positioning, can solve the problem that the receiver cannot receive GPS signals, etc., and achieve the effect of low cost and small chip area overhead

Active Publication Date: 2009-05-06
北京中科微知识产权服务有限公司
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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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  • Rapidly recapturing and positioning method under receiver signal deletion condition of global positioning system
  • Rapidly recapturing and positioning method under receiver signal deletion condition of global positioning system
  • Rapidly recapturing and positioning method under receiver signal deletion condition of global positioning system

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Embodiment Construction

[0078] 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.

[0079] The GPS baseband chip is the chip that processes the baseband signal 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".

[0080] 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. An...

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Abstract

The invention relates to a quick positioning method for realizing quick recapture under a GPS signal lacking condition, which belongs to the field of global satellite positioning and guidance, such as a GPS system. The quick recapture and the positioning are realized by different tactics according to signal lacking time, the satellitic continuous tracking and positioning of short signal lack such as less than 2 seconds is realized by using a false tracking ring, a recapture method which is based on the prior knowledge is used for the direct recapture of a satellite, the quick recapture and positioning of the longer signal lack such as a plurality of minutes is realized by using the mixing heat recapture based on forecasting, and the quick recapture under a plurality of signal lacking conditions can be realized by using the method. The quick recapture and positioning method is suitable for baseband processing chips of arbitrary types of GPS receivers, the starting and positioning speed can be greatly increased, the structure is simple, the area of the chips is small, the cost is low, and the transplantation is convenient.

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 fast recapture in the absence of GPS signals, thereby realizing fast positioning. Background technique [0002] Global satellite positioning and navigation systems, such as the Global Positioning System (GPS), include 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 (SPS) and is a direct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02G01S5/14G01R29/10
Inventor 郑睿陈杰李金海李健
Owner 北京中科微知识产权服务有限公司
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