Dual-satellite positioning method based on WGS (World Geodetic System)-84 model

Abstract

The invention belongs to the technical field of electronic countermeasures, in particular to a dual-satellite positioning method based on a WGS (World Geodetic System)-84 model. A dual-satellite direction-finding positioning closed resolving method based on the WGS-84 model is provided, the dual-satellite direction-finding closed resolving method is provided through the pseudo linearization of anangle measuring equation and combination of WGS-84 earth ellipsoidal model restraint, earth surface target radiation source is positioned and resolved, a weighted least square solution analysis of thetarget under the restraining action of an earth ellipsoidal model is provided; as proved by the simulation, the algorithm can approach the Cramer-Rao low bound (CRLB) of positioning error when the system direction-finding error is not very large; compared with the conventional method of directly resolving a multivariate non-linear equation by an analytical method and using a Newton iteration method to resolve the target position, the method has the advantages that when the two satellites are in the same rail or different rails, the target can be positioned and resolved uniformly, under the method, the configuration of a satellite is flexible, iteration resolution is not required, calculation amount is low, and the problem of inaccurate positioning solution is solved.

Description

technical field [0001] The invention belongs to the technical field of electronic countermeasures, and in particular relates to a double-star positioning method based on the WGS-84 model. Background technique [0002] With the militarization of space and the rapid development of electronic reconnaissance satellites, space has gradually become the strategic commanding heights for safeguarding national security and interests. The satellite-based space electronic reconnaissance system is not affected by space due to its wide-area coverage and little influence of climate factors. The characteristics of geographical restrictions have attracted widespread attention from the military of various countries, and the use of satellite reconnaissance systems to obtain information has become an important source of intelligence for battlefield operations. At present, my country's aerospace industry is developing rapidly, and satellite detection technology has been rapidly developed and wid...

AI Technical Summary

Problems solved by technology

[0003] At present, the positioning method of joint time difference / frequency difference in dual-satellite positioning cannot uniformly solve the situation of satellite co-orbit / difference when using the analytical method for positioning; using the Newton iteration method depends on the initial value point of the target, and the calculation amount is large. The stability of the algorithm is not good, and there is a problem of positioning and defuzzification

For double-star direction finding and positioning, there are also problems such as the high degree of nonlinearity of the direction finding equation and the difficulty in solving iterative methods.

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