Satellite Antenna Anti-interference Technology Based On Multi-domain Fusion Processing

The satellite navigation and positioning system have already been used widely in the military, agriculture, transport, and scientific research fields, thus the satellite navigation technology becomes the modern focus. However, due to there are tens of thousands of kilometers between the satellites signals and ground, and the ground receiving signals’power are very weak, so they can easily been affected by both natural and man-made jamming, the normal working of satellite navigation receiver can be severe destructed. Therefore, the research on anti-jamming technology of satellite antenna on satellite navigation system is very necessary. The paper focused on the weakness of satellite navigation system, in order to improve the anti-jamming capability of the satellite navigation receiver’s antennas, the satellite anti-jamming antennas technology is researched deeply.Firstly, the development situation of satellite antenna anti-jamming technology from our over the world is researched, the anti-jamming measure is decided by adaptive mulling antenna anti-jamming technology by analyzing the characteristics of satellite and interference pattern.Secondly, we build the model of space nulling anti-jamming system based on Power Inversion array structure, the common narrowband interference and wideband interference in the satellite channel are suppressed by using LMS algorithm and its improved algorithm (MC-LMS algorithm), the anti jamming ability, convergence and rousted of the two kinds of algorithms are compared by simulation. On the basis, the SMC-LMS anti-interference algorithm is raised by using FROST space-time array processing model. The algorithm effectively reduces the space-time signal processing computational complexity and computati on, it has the advantages of fast convergence speed and small steady-state error etc, also has the ability of suppressing multiple interferences (the number more than the antenna array element).Thirdly, the paper designs an anti-interference algorithm based on multi-domain-STFBLMS anti-interference algorithm by combining the space-time signal processing structure model and FBLMS algorithm. The algorithm has good anti-interference ability; it can suppresses multiple narrowband interference and wideband interference, and has the advantages of fast convergence speed and small steady state error. Besides, the algorithm can play a good anti-jamming effect by estimating the array signal’s power spectrum and adapt step size adaptively under the conditions of low signal-to-interference ratio. All things consideration, the anti-interference performances of algorithm is discussed in a variety of situations, such as introducing to the array element, channel uncertainties and mutual coupling of sensor array etc.Finally, the implementation process of the MC-LMS algorithm is analyzed, and it overall design scheme of FPGA implantation is introduced, bedsides, the signal process module is analyzed in detailly.Through dividing the entire algorithm and coding by the VHDL language, the MC-LMS algorithm’s effectiveness and real time nature of suppressing interference signal is verified by using hardware simulation on the software platform of ISE12.4.