Guangtongxin yanjiu (Jun 2024)
Dual-satellite Interference Source Localization based on Multi-Beam/TDOA Technology
Abstract
The single-satellite multi-beam interference source localization method requires more than three co-frequency beams to receive the interference source signal to achieve positioning. Due to the limited number of co-frequency beams and the randomness of the location of the interference source, it is usually that the co-frequency beams can receive the interference source signal less than three, or low receiving gain, which may affect the positioning accuracy.【Objective】In order to solve the problem of positioning with only two available beams and further improve the positioning accuracy of interference sources, a dual-satellite joint positioning model based on multi-beam antenna and Time Difference of Arrival (TDOA) technology is proposed through adjacent stars and main stars.【Methods】In this paper, the feasibility of the model is proved by establishing the dual-satellite joint positioning model and the positioning equations in parallel. At the same time, based on Geometric Dilution of Precision (GDOP), the positioning error of the positioning model is analyzed from four aspects: receiving gain error, beam pointing error, arrival time difference error and position prediction error.【Results】The simulation results show that the positioning accuracy of the dual-satellite joint positioning method based on multi-beam antenna and TDOA technology is obviously better than the traditional single-satellite multi-beam positioning method.【Conclusion】The dual-satellite joint positioning method based on multi-beam antenna and TDOA technology makes use of the advantage that TDOA has less influence on positioning accuracy. Therefore, it replaces part of the beam to participate in satellite positioning, which not only reduces the demand for the number of positioning beams, but also reduces the error of measurement gain and the error of beam pointing with improved positioning accuracy and the reliability. The simulation results indicate that the proposed method is a better positioning method than single-satellite multi-beam positioning.
