Ground target positioning method based on Doppler effect

Abstract

The invention provides a ground target positioning method based on a Doppler effect. The ground target positioning method comprises the following steps: acquiring high-precision Doppler data; determining satellite position information corresponding to the message capture time; according to the obtained message signal frequency and the calculated satellite position, ground target Doppler positioning is carried out by adopting a least square algorithm constrained by surface elevation, and target position positioning calculation is completed; according to the same ground terminal message captured by a plurality of satellites, ground terminal signal emission frequencies are respectively determined, inter-satellite measurement frequencies are corrected according to frequency differences calculated by different satellites of the same target, and multi-satellite data fusion is carried out; and carrying out secondary positioning on a target position by using multi-satellite fusion data and applying a Doppler positioning algorithm. According to the method, ground target position positioning is realized through high-precision time scale design, high-precision frequency measurement and inter-satellite frequency difference correction, so that the timeliness and accuracy of positioning are improved on the premise that the method does not depend on inter-satellite clock synchronization.

Description

technical field [0001] The invention belongs to the technical field of satellite message collection, in particular to a ground target positioning method based on the Doppler effect. Background technique [0002] Nowadays, with the intensification of human activities, people's pursuit and cognition of data is becoming more and more popular, and more and more people are paying attention to it. However, the research on satellite data collection in special environments is not enough, especially in some large connections, In terms of low-power data transmission, satellite data collection systems are still in their infancy. Obtaining data through traditional manual methods has the characteristics of high cost, high risk, and low efficiency. Therefore, data collection for satellite links (such as ocean remote sensing information, animal migration information, etc.) has become a development trend in various countries. [0003] At present, the detection of marine and polar environm...

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Problems solved by technology

[0003] At present, the detection of marine, polar and other environments at home and abroad is mainly realized through scientific research ships, and animal migration is mainly obtained by manual tracking. The current data acquisition has the disadvantages of small scope and high cost.

The use of space-borne receivers to achieve effective data reception can make up for the above shortcomings, but the current existing data collection satellites are prone to interference for large-scale and wide-coverage signal collection, and the success rate is not high

[0004] Due to the limitations of spaceborne data collection in many aspects, it is necessary to provide a ground target positioning method and solve the signal interference problem caused by the large-scale and wide-coverage signal collection of data collection satellites

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