Method for preprocessing observed quantity of global positioning system receiver

A global positioning system and observational technology, applied in the field of global satellite positioning and navigation, can solve problems such as the deterioration of observational accuracy, the decrease in positioning accuracy, and the inability of receivers to receive GPS signals, so as to improve accuracy, improve accuracy, reduce The effect of the chance of locating the wrong point

Active Publication Date: 2010-06-09
北京中科微知识产权服务有限公司
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  • Abstract
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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
When the signal-to-noise ratio is lower t...

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  • Method for preprocessing observed quantity of global positioning system receiver
  • Method for preprocessing observed quantity of global positioning system receiver
  • Method for preprocessing observed quantity of global positioning system receiver

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Embodiment Construction

[0040] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0041] 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 implemented in a GPS baseband chip. For the sake of convenience, "receiver" in the present invention refers to "GPS baseband chip".

[0042] figure 1 A schematic diagram of a typical GPS receiver to solve the positioning is described. Knowing the positions 101 of the four satellites and the pseudoranges 102 between the four satellites and the receiver, that is, the error value of the receiver's position 103 and the receiver time relative to the satellite time can be calculated through the so-called "pseudorange observation equation" , to complete the work ...

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Abstract

The invention discloses a method for preprocessing observed quantity of a global positioning system (GPS) receiver, comprising the following steps: the receiver latches and stores the observed quantity when the measuring sub-time slot signal comes; the receiver filters the latched and the stored observed quantity when the resolving time slot signal comes; and the receiver obtains the final observed value for resolving the receiver position. On the basis of slightly increasing the whole calculated quantity, the invention can effectively improve the positioning accuracy, simultaneously cope with such complex environment as urban forests and greatly reduce the probability of occurrence of positioning error points.

Description

technical field [0001] The present invention relates to the technical field of global satellite positioning and navigation, such as GPS systems, and in particular to a method for preprocessing observations of GPS receivers. Background technique [0002] A global satellite positioning and navigation system, such as the Global Positioning System (GPS), includes 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. The satellite orbits are arranged in multiple planes so that such signals can be received from at least four satellites anywhere on Earth. More typically, such signals are 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. Commercially used signal is related to Standard Positioning Service (SPS) and is called Coarse Code (C / A Code) Direct Sequence...

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Application Information

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IPC IPC(8): G01S5/02G01S5/14G01S1/02
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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