Different-orbit single-satellite time-sharing frequency measurement positioning method based on star position optimization

Abstract

The invention discloses a different-orbit single-satellite time-sharing frequency measurement positioning method based on star position optimization. The method comprises the following steps: measuring the frequency of a signal sent by a ground radiation source reaching an observation satellite; establishing a different-orbit single-satellite time-sharing frequency measurement positioning model, selecting a plurality of satellites with different orbits to respectively carry out frequency measurement at different moments, and establishing a positioning equation set according to a plurality of measured different signal frequencies; deriving geometric dilution precision factors, and analyzing the influence of various factors on the positioning precision; and establishing a star position optimization model, and optimizing the selection of orbit and satellite observation moments to improve the positioning precision. According to the invention, within a limited range of visibility, single satellites flying through different orbits of a positioning visual area at different moments are used for repeatedly and independently observing the same interference source; due to the difference in the aspects of flight direction, observation position distribution and the like, compared with a single-orbit single-satellite time-sharing frequency measurement positioning scheme, the positioning effect is stable, the precision is higher, the space between satellites is larger, and the selection of measurement positions can be more flexible.

Description

technical field [0001] The present invention proposes a time-sharing frequency measurement and positioning method for a single satellite in different orbits based on star position optimization. By discussing different satellite observation positions on different orbits, the positioning effect is analyzed and simulated, and the satellite observation position under different orbit conditions is obtained. preferred option. Background technique [0002] The passive positioning technology of radiating target sources, especially the passive positioning system relying on modern low-orbit satellites, has a large positioning area and can quickly locate the transmitted signals of sea, land and air targets. It is widely used in civil and military fields. important role and broad application prospects. Commonly used radiation source positioning systems include single-satellite positioning and multi-satellite positioning systems. Compared with multi-satellite positioning technology, the...

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Problems solved by technology

[0004] The purpose of the present invention is to: aim at the problem that the probability of target source visible satellites is reduced in the positioning scene with limited field of view, resulting in difficult positioning, and proposes a time-sharing frequency measurement and positioning method based on star position optimization for different orbits and single satellites. Optimize the orbit and satellite observation position to achieve a significant improvement in positioning accuracy

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