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Management method for global positioning system receiver navigation message

A global positioning system and navigation message technology, which is applied in the field of navigation message management of GPS receivers, can solve the problems that the receiver cannot receive GPS signals, etc., and achieve the effects of improving hot start positioning speed, simple management, and clear structure

Active Publication Date: 2009-07-29
北京中科微知识产权服务有限公司
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  • Abstract
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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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  • Management method for global positioning system receiver navigation message
  • Management method for global positioning system receiver navigation message
  • Management method for global positioning system receiver navigation message

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Embodiment Construction

[0071] 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.

[0072] 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".

[0073] figure 1 A typical GPS receiver positioning method is described. Knowing the position 101 of four satellites and the pseudo-range 102 between these four satellites and the receiver, the error value of the position 103 of the receiver and the receiver time relative to the satellite time can be calculated by the so-called "pseudo-range observation equation" . as follows:

[0074] ρ ...

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Abstract

The invention relates to the field of global satellite positioning and navigation, such as a GPS system, in particular to a navigation message management method which is used for a GPS receiving machine. The method comprises the steps as follows: the receiving machine internally comprises three parts of navigation message spaces: one part is used for receiving demodulation data, another part is used for memorizing backup and the third part is used for calculation. When the demodulation is completed and the calibration is passed, the navigation message in the demodulation navigation message space is updated and caculated; if the demodulation is not completed or the calibration is not passed, within the validity period of the message and when comforming with a certain synchronous condition, the navigation message is updated and calculated by the backup navigation message so as to realize the calculation of the user position till that the demodulation navigation message is available. The navigation message management method has clear structure, simple management, safety and reliability, can greatly reduce the time required for positioning after catching the satellite, and greatly improves the hot booting positioning speed, warm booting positioning speed and re-positioning speed after loss of signal.

Description

technical field [0001] The present invention relates to the field of global satellite positioning and navigation, such as the GPS system, in particular to the field of a navigation message management method for a global positioning system receiver. 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-se...

Claims

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Application Information

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IPC IPC(8): G01S1/02G01S5/02G01S5/14
Inventor 郑睿陈杰
Owner 北京中科微知识产权服务有限公司
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