A Study Of Space-time-polarization Anti-jamming Algorithm

Interference suppression is an important part of GPS receiver throughout and has been studied for a long time. Here are some traditional technologies, like the processing methods based on frequency domain, space domain and space-time domain, which are all implemented by scalar sensor unit. But the complete information of electromagnetic wave needs both electronic field and magnetic field to express. The EVS(Electromagnetic vector sensor) can receive the information of signal completely, and can receive the information of polarization domain. The polarization sensitive array, which is made up by two-components of the electromagnetic vector sensor, can make the signal processing with polarization information to anti jammer and promote the performance of anti-jamming. This dissertation mainly studied some aspects of the GPS anti-jamming algorithms based on EVS as followed:1. The performance of the anti-jamming algorithm based on single EVS is analyzed, and is compared with that of the circular separated single EVS. To decrease the couple effect of dipoles/loops, the circular separated single EVS is designed specially. It can confirm the completeness of six components and meets the constraint of the size of the receiver’s antenna. The separation of the space makes the aperture with the improvement of the performance.2. The anti-jamming algorithm of polarization-space domain is proposed with the basis of polarization sensitive array. Compared with that of space domain, it can keep good performance when the jammer is close to the signal in the space. The application situation is extended.3. The space-time-polarization anti-jamming algorithm, which is a stretch of space-time anti-jamming and polarization-space anti-jamming, makes use of signal’s information of time, space and polarization domains. Multi-dimension anti-jamming is realized and has better response than polarization-space anti-jamming. To describe the orthogonal relationship of two-components of each EVS, quaternion is used to construct the model of signal that received by each unit and the space-time-polarization anti-jamming based on quaternion is achieved. Compared with that of plural, it ensures the performance, andreduces the computational complexity.