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Pseudorange differential method based on dual-satellite time difference and frequency difference passive positioning

A technology of passive frequency difference and pseudorange difference, which is applied in satellite radio beacon positioning system, radio wave measurement system, measuring device, etc., and can solve the problem of high-precision positioning of difficult radiation sources

Active Publication Date: 2014-03-19
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Problems solved by technology

At present, there are many researches at home and abroad that mainly focus on the improvement method of positioning solution of measurement equation, and the positioning accuracy can only reach 10-20km. If the scientific error correction method is not used to correct various positioning errors, it will be difficult Achieve high-precision positioning of radiation sources

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  • Pseudorange differential method based on dual-satellite time difference and frequency difference passive positioning
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  • Pseudorange differential method based on dual-satellite time difference and frequency difference passive positioning

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the examples, and the present invention includes but not limited to the following examples.

[0030] The measurement accuracy of the time difference of arrival adopted in this embodiment is 30 ns, the measurement accuracy of the frequency difference of arrival is 10 Hz, the inter-satellite ranging accuracy is 0.3 m, the inter-satellite relative position determination accuracy is 1 m, the satellite orbit is low-orbit satellite data, and the satellite height is 800 km . In this embodiment, the carrier frequency f of the reference station 0 = 10GHz, the initial coordinate of the unknown radiation source is [100 35 0] as an example, on this basis, the unknown radiation source is randomly selected, the reference station coordinate is [105 35 0], based on the pseudo- The distance difference method specifically includes the following steps:

[0031] 1. Measure the pseudorange difference between satelli...

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Abstract

The invention provides a pseudorange differential method based on dual-satellite time difference and frequency difference passive positioning. According to the method, the pseudorange difference between two satellites and a reference station is measured successively, the pseudorange correction of the satellites is calculated, the pseudorange difference of an unknown radiation source is corrected through the pseudorange correction to obtain an arrival time difference which is close to the true value, the arrival frequency difference between the reference station and the two satellites is measured, the arrival frequency difference between the reference station and the two satellite which is close to the true value is calculated, the arrival frequency difference between the unknown radiation source and the two satellites is corrected through the frequency correction of the satellites to obtain an arrival frequency difference which is close to the true value, and the high-accuracy positioning of the unknown radiation source is realized through an earth ellipsoid equation and the arrival time difference and the arrival frequency difference which are close to the true value. According to the invention, system positioning errors can be corrected, so that the accuracy of a dual-satellite passive positioning system can be improved.

Description

technical field [0001] The invention belongs to the technical field of passive positioning, in particular to a pseudo-range difference method applied in the error correction technology of dual-star passive positioning. Background technique [0002] GPS pseudo-range difference is a technology widely used at present. Its basic principle is that the receiver of the reference station measures the distance from it to the satellite. Because of the existence of ephemeris error and satellite clock error, the measured pseudo-range is not equal to the distance from the satellite. The pseudorange calculated by the ephemeris is regarded as the measurement value containing error, the pseudorange calculated according to the ephemeris is taken as the true value, the real pseudorange is compared with the measurement value containing error, and the difference is filtered by a filter and Calculate the pseudo-range correction number, and then broadcast the pseudo-range correction number of all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/41
CPCG01S19/41G01S19/42
Inventor 薛艳荣李孝辉许龙霞任烨李雨薇
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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