Method for smoothing pseudo range by using Doppler frequency shift

A technology of Doppler frequency shift and smoothing and pseudo-smoothing, which is applied in the field of GPS receiver positioning, can solve the problems of whole cycle ambiguity, cycle slip, application limitation, etc., and achieve the effect of improving accuracy, reducing error and improving positioning accuracy

Active Publication Date: 2010-10-20
杭州中科微电子有限公司
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Problems solved by technology

The measured carrier phase (the carrier phase difference between the reproduced signal and the transmitted signal) is the carrier phase value of less than one full cycle, and the distance from the satellite to the receiver is the unknown number of full cycles and the phase sum of less than one full cycle. it has a whole week ambiguity problem
However, once the lock is lost halfway, it will cause a cycle slip phenomenon, so that the unkn

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  • Method for smoothing pseudo range by using Doppler frequency shift
  • Method for smoothing pseudo range by using Doppler frequency shift
  • Method for smoothing pseudo range by using Doppler frequency shift

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[0041] The method and its implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation examples. Through the following detailed discussion, those skilled in the art will be able to deepen their understanding of the objects, features and advantages of the present invention.

[0042] figure 1A block diagram showing the components of a GPS receiver. The GPS receiver 1 is composed of an antenna 11 , a radio frequency processing module 12 , a baseband signal processing module 14 , a navigation processing module 15 and a PVT information output module 16 . Antenna 11 receives signals from satellites 131, 132, 133-13n, and radio frequency processing module 12 processes the received radio frequency signals to obtain digital intermediate frequency signals suitable for baseband processing, and sends them to baseband signal processing module 14. The baseband signal processing module 14 further...

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Abstract

The invention discloses a method for smoothing the pseudo range by using a Doppler frequency shift, comprising the following steps: calculating the pseudo range of a measured epoch by using the code phase measurement value; calculating the change rate of the pseudo range of the measured epoch by using the Doppler frequency shift; calculating the estimation value of the pseudo range of the current epoch by using the smoothed value of the last epoch and the change rate of the pseudo range of the current measured epoch; and endowing the measurement value and the estimation value of the pseudo range of the current epoch with different weight to obtain the smoothed value of the pseudo range of the current epoch. Because the error on the pseudo range measured by using the code phase in single time is great, the Doppler frequency shift is used for smoothing the pseudo range. Therefore, the error on the pseudo range can be reduced effectively, and further the positioning accuracy of the GPS can be improved.

Description

technical field [0001] The invention belongs to GPS receiver positioning technology, relates to a method for improving the positioning accuracy of a GPS receiver, in particular to a method for smoothing pseudo-ranges using Doppler frequency shift information, which uses Doppler frequency shift information to smooth pseudo-ranges to obtain A method to obtain a pseudorange with a small error. Background technique [0002] The Global Positioning System (GPS) is a navigation system developed by the U.S. Department of Defense that uses satellite constellations for 24-hour positioning. The basic principle of GPS receiver positioning is to receive signals from at least four satellites, use the navigation message transmitted by the satellite to calculate the satellite position, and use the ranging code (C / A code and / or P code) transmitted by the satellite to calculate the distance between the user and the satellite. The line-of-sight distance with a certain deviation is called pseu...

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Application Information

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IPC IPC(8): G01S5/14
Inventor 赵玉凤徐建华何文涛骆颖韬
Owner 杭州中科微电子有限公司
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