Null widened interference suppression method of high-dynamic satellite navigation system

Abstract

The invention discloses a high dynamic satellite navigation system interference suppression method widening zero defect, the method comprises: respectively down-frequency conversing N ways of radio frequency signals received by the N (N>2) element aerial array into IF signals; respectively performing the A / D conversion for the IF signals in the N ways obtained by the down-frequency conversion; obtaining the orthogonal complement space of the interference subspace based on the relation between the interference power and the satellite signal and the noise power, by using the N ways IF digital signals obtained in the step 2; calculating the new orthogonal complement space of the subspace relating to the differentiation order, the array element position and the interference subspace based on the differential constraint principle; combining the new orthogonal complement space of the subspace and the power invert algorithm to calculate the weighting vector of the aerial array based on the wave packet zero defect width setting proportionality coefficient to be reached by using the obtained new orthogonal complement space of the subspace in the step4. The invention can enable the output signal inference ratio of the satellite navigation receiver under high dynamic environment to be obviously increased, and can reduce the mis-capturing rate of the satellite signal by the satellite navigation receiver under high dynamic environment.

Description

technical field [0001] The invention relates to a satellite navigation system interference suppression method. In particular, it relates to a high dynamic satellite navigation system interference suppression method for widening the null width of the antenna beam in the interference direction and widening the null. Background technique [0002] The satellite navigation system is composed of artificial satellites and ground support systems. It provides comprehensive real-time three-dimensional navigation and positioning services for sea, land, and air, and is widely used in civilian and military fields. In civilian use, the receiver carrier is in a static state or a low-dynamic motion state, while in military use, the speed, acceleration, and acceleration rate of the receiver carrier are often very large, which is called high dynamic. With the modernization of national defense, the requirements for the accuracy and reliability of flying object trajectory testing and flying ob...

AI Technical Summary

Problems solved by technology

However, these methods can effectively suppress interference only when the receiver is in a static or low dynamic environment

When the receiver is in a highly dynamic environment, the performance of the algorithm will be seriously affected

This is because in a highly dynamic environment, the movement speed of the satellite navigation receiver carrier is generally greater than 1km / s. In war, the satellite navigation receiver carrier is often only tens or hundreds of kilometers away from the enemy jammer, causing interference relative to the satellite The direction of the navigation receiver changes quickly, and the null trap formed by the anti-jamming algorithm under low dynamics is too narrow, and the interference can easily move out of the direction pointed by the null trap and cannot be suppressed

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