Inhibition method of space-time blind self-adaptive GPS (Global Positioning System) interference based on despreading and respreading technology

Abstract

The invention relates to an inhibition method of space-time blind self-adaptive GPS (Global Positioning System) interference based on a despreading and respreading technology, which comprises the following steps of: firstly, using a weighted vector which is calculated by a space time minimum power algorithm as an initial weighted vector of a space time self-adaptive GPS interference array; secondly, despreading array output obtained by the space time minimum power algorithm and reconstructing all GPS satellite signals received by the array or L GPS satellite signals which satisfy the locating requirement; thirdly, using the reconstructed GPS satellite signals as reference signals and updating the weighted vector of the space time self-adaptive array; fourthly, despreading array output obtained by the weighted vector after updating and reconstructing the L GPS satellite signals; fifthly, repeating the step three and the step four until the algorithm converges, thereby obtaining L beams, wherein each beam points to a GPS satellite signal; and sixthly, carrying out equalization processing on each beam output. In the invention, a plurality of high-gain beams with the anti-interference ability can be generated, the multi-beam forming ability is not limited by an array number, and satellite signal direction information is not needed in the equalization processing, therefore, the invention is suitable for arbitrary array.

Description

technical field [0001] The invention relates to a GPS interference suppression method. In particular, it relates to a space-time blind self-adaptive GPS interference suppression method based on the de-respreading technology, which can realize interference suppression and ensure no attenuation of satellite signals. Background technique [0002] GPS is the most promising navigation system at present because it can provide accurate position, speed and time information for any place in the world all-weather and all-weather, and is widely used in military and civilian fields. However, because the received GPS signal is very weak, 20-30dB lower than the noise, and the spreading code C / A code of the GPS signal is public, thus making the GPS signal vulnerable to various intentional and unintentional interference signals influences. If the interference signal is very strong and exceeds the inherent processing gain of the GPS spread spectrum signal, the GPS receiver will lose its lo...

AI Technical Summary

Problems solved by technology

The space-time minimum power method is a commonly used space-time domain processing technique, but this algorithm can only suppress interference and cannot provide signal processing gain, which will cause GPS signal fading, which is undesirable for GPS receivers

In addition, due to the space-time processing structure, the GPS receiver produces acquisition bias, so the output of the space-time array must be equalized to compensate for the acquisition bias

Images