Development Of Anti Jamming GPS Receiver

With the development of science and technology, GPS technology used in daily life and military technology matures and won a huge development, such as in civilian vehicle navigation, geographical surveying and mapping, in the military precision strike and orientation. The current GPS research involves two aspects:how to use GPS in various fields effectively and how to break through the jamming with the GPS system. The improvement of GPS puts forward higher request to the anti-jamming ability of GPS receiver. Currently, the anti-jamming technology improves, Space-time adaptive anti-jamming technology can effectively suppress various kinds of jamming, which can greatly improve the anti-jamming capability of the receiver.This project combines theory with practice. In this project, the vulnerability of GPS signal, the classification of jamming, Reduced dimension processing and it's optimized criterion are summarized, GPS space-time adaptive anti-jamming algorithm is introduced, such as types of jamming, anti-jamming measures, principle and method of space-time anti-jamming processing based on reduced dimension suppression of technology principle and dimension reduced processing, these are the processing and method of simulation and experiment of the multi-channel GPS anti-jamming receiver provides.To produce the multi-channel GPS anti-jamming receiver, the hardware circuit of GPS anti-jamming receiver is designed, this includes AD module, DA module, FPGA module, DSP module, power and LC filters. In order to realize the function, GPS space-time anti-jamming algorithm based on FPGA and DSP program is completed. The software design is carried out from the following aspects such as if signal acquisition function, digital down/up conversion function and weight function.Finally, the joint debugging and performance test of the anti jamming system of GPS anti-jamming receiver is finished. The test results show that the anti-jamming performance of the GPS anti-jamming receiver is good, and the effectiveness of the anti-jamming algorithm is verified.Therefore, The research results of this paper have important reference value for the communication countermeasure.