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Doppler frequency compensation method of GPS receiver

A GPS receiver, Doppler frequency technology, applied in the field of Doppler frequency compensation, can solve problems such as system Doppler error, and achieve the effects of improving correlation, improving accuracy, and improving compensation precision

Active Publication Date: 2010-09-01
SHANGHAI CYGNUS SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if this is useful to a certain extent, the system will still have Doppler error

Method used

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  • Doppler frequency compensation method of GPS receiver
  • Doppler frequency compensation method of GPS receiver
  • Doppler frequency compensation method of GPS receiver

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Embodiment Construction

[0018] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0019] Such as figure 1 , figure 2 As shown, a method for Doppler frequency compensation of a GPS receiver. The Doppler module DPL receives the data output from the capture module CCt. The data includes an I input signal CIO including Doppler and a Q including Doppler. The input signal CQO is stored in the multiplier in the phase rotator of the Doppler module. The specific satellite or source that predicts the Doppler phase is also input to the multiplier after the carrier numerically controlled oscillator NCO and sine / cosine look-up table are processed, and superimposed on the CIO and CQO of the same satellite (or other sources), The I output signal DIOut and the Q output signal DQOut after Doppler compensation are formed. In the Doppler module DPL of the present invention, the data sampling rate is 2f 0 (f 0 =1.023MHz), for each satellite channe...

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Abstract

The invention discloses a compensation method for Doppler-frequency of GPS receiver. The method outputs and stores data with Doppler I inputting signal and Q inputting signal from capturing module data to the multiplier in phase rotator of Doppler module. It inputs Doppler phase parameter and Doppler frequency parameter to the adder of NC oscillator of Doppler module. Doppler carrier frequency and carrier phase are added by the adder. Outputting value is inputted into outputting buffer of carrier phase to generate current carrier phase value. It is outputted by the outputting buffer of carrier phase into a sine / cosine searching table. Corresponding sine / cosine value is searched from the searching table and is inputted into the multiplier of phase rotator with Doppler I inputting signal and Q inputting signal together. Signal phase is inputted in rotation. Finally rotated value is quantized to output compensation signal of Doppler frequency to correlator and related calculation is carried out with local production code.

Description

Technical field [0001] The invention relates to a Doppler frequency compensation method in a GPS receiver. Background technique [0002] The Global Positioning System (GPS) consists of 24 earth-orbiting satellites arranged in 6 orbital planes. GPS is to determine the user's location by measuring the time of arrival of satellite signals (TOA). A GPS receiver is connected to at least 4 satellites, responds to them, and then can get its precise positioning. [0003] Due to the relative motion between the satellite and the earth, the frequency of the signal sent from the satellite to the ground receiver will shift. In addition, the bit frequency and chip frequency will be shifted accordingly. This change in frequency is called Doppler shift. For the signal transmitted by the satellite, its carrier frequency and bit frequency spectrum are affected by Doppler. In order to be able to demodulate this signal, the Doppler shift must be compensated at the ground receiver. If the satellit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S1/02G01S5/14G01S19/23
Inventor 兰娟曹磊周文益
Owner SHANGHAI CYGNUS SEMICON CO LTD
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