Statistics-based space-time null widening method for satellite navigation receivers

Abstract

The invention discloses a statistics-based space-time null widening method for satellite navigation receivers. The method comprises the following steps that: 1) array parameters are determined, a space-time signal vector received by an array is obtained; 2) disturbance conforming to normal distribution is applied to the incident angle of interference signals, the covariance matrix of signals received by the array at the current moment is calculated on the basis of the space-time signal vector received by the array; and 3) an optimal time-adaptive weight is calculated based on the covariance matrix of the signals received by the array and according to a linear constrained minimum variance criterion. According to the statistics-based space-time null widening method for the satellite navigation receivers provided by the invention, wide null can be formed in an interference direction, so that the degree of freedom of space-time processing can be significantly increased, and therefore, interference which changes within a certain range can be effectively cancelled, and the robustness of the adaptive algorithm of a small-array satellite navigation receiver can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation, in particular to a statistical space-time null widening method for a satellite navigation receiver. Background technique [0002] Satellite navigation can provide all-weather, all-time, continuous high-precision three-dimensional position, three-dimensional velocity and time information for land, ocean and space users, and has incomparable advantages over other navigation methods. In recent years, it has been widely used in various fields of social life. applications, especially in military applications. However, since the satellite is about 20,000km away from the earth's surface, the satellite signal received by the satellite navigation receiver is very weak, only about -160dBW, which is 20-30dB weaker than the thermal noise of the receiver. Therefore, the satellite navigation signal is easily affected by interference, so that the satellite navigation receiver cannot perform the fu...

AI Technical Summary

Problems solved by technology

However, for small arrays of satellite navigation receivers, some null widening methods are often ineffective because the degrees of freedom for anti-jamming are not enough

The essence of the null widening method is to increase the degree of freedom of interference, thereby widening the null, but the anti-interference degree of freedom and the small array itself are a pair of contradictions, and it cannot be applied to the small array of satellite navigation receivers at this stage

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