Method and system for estimating two-dimensional angle-of-arrival of satellite signal

Abstract

The invention belongs to the technical field of systems measuring a direction or a deviation from a predetermined direction and discloses a method and system for estimating a two-dimensional angle-of-arrival of a satellite signal. The method comprises a step of performing initial suppression on non-Gaussian clutter by using fractional low-order circular correlation, a step of performing secondarysuppression on the non-Gaussian clutter by using an improved zero-order statistical magnitude, a step of obtaining a signal subspace by an optimization method and obtaining a three-dimensional map oftwo-dimensional angle-of-arrival estimation by a multi-signal clustering method, and a step of performing maximum value search on the three-dimensional map to obtain an estimated value of the two-dimensional angle-of-arrival in a non-Gaussian clutter scene. When a generalized signal-to-noise ratio is greater than 10 dB, a root mean square error of azimuth and pitching angle estimation is smaller than 10<-1>. That means that the system and the method have good estimation performance for the two-dimensional angle-of-arrival of the satellite signal in the non-Gaussian clutter scene under a low SNR condition, and a moving target can be tracked and located through satellite radiation source signals by using the method and the system.

Description

Technical field [0001] The invention belongs to the technical field of systems for determining directions or determining deviations from a predetermined direction, and in particular relates to a method and system for estimating the two-dimensional angle of arrival of satellite signals. Background technique [0002] At present, the existing technology commonly used in the industry is as follows: Arrival angle estimation is an important research direction in the field of array signal processing. It is a technology to analyze the target azimuth according to the incident angle of the target signal received by the array antenna. It is currently widely used in various military and civil fields such as positioning, communication and prediction. The accuracy of the angle of arrival estimation will directly affect the positioning accuracy of the moving target, so the angle of arrival estimation has become an important part of moving target positioning. Normally, the technical development ...

AI Technical Summary

Problems solved by technology

[0003] In summary, the problems in the prior art are: The existing angle of arrival estimation method ignores the time characteristics of the signal, resulting in low DOA estimation accuracy; it is only suitable for one-dimensional DOA estimation, and cannot be used in scenarios where two-dimensional DOA is estimated; the amount of calculation is large, resulting in computational complexity High; the estimation accuracy is not high when the noise characteristics are strong

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