Radiation source passive radar signal processing simulation
|School||University of Electronic Science and Technology|
|Course||Signal and Information Processing|
|Keywords||Multi- radiation source passive radar FM radio signals Adaptive beamforming Digital Down Conversion Doppler processing CFAR|
Unlike traditional active radar, passive radar itself does not radiate electromagnetic waves, but the use of radio, television and other external civil signal as an opportunity to radiation source, to detect aircraft or missile target, estimated its position, distance and speed parameters, and to track and identify targets. Radiation outside the main advantage of passive radar: external illuminators for civil signal, widely distributed, it is difficult to judge or destroyed, thus reducing the possibility of radar interference to improve the viability of the radar; most external radiation source lower frequency signal, and use it for target detection is also beneficial to found stealth targets and smaller target. Based on the FM radio multi passive radar radiation source using a plurality of FM broadcast signal as an opportunity to the irradiation source, processing of each of the FM broadcast signal after the object reflector, the use of coherent synthesis techniques to improve the detection performance of the radar, which is also conducive detect stealth targets. In this paper, based on FM radio radiation source of passive radar signal processing techniques are discussed and research. Mainly include the following: First, the basic principles and characteristics of the radiation source passive radar, as well as more than passive radar radiation source with respect to the advantages of traditional radar. Secondly, the study and analysis of the form and characteristics of the FM broadcast signal, to compare the influence of the type of signal in the form of target detection performance. No distortion of the signal due to sampling, the focus of the based orthogonal transform digital conversion technology, used to eliminate the target echo the direct wave adaptive digital beamforming method is deduced in detail on the echo the direct wave Doppler processing technology, and multiple sources of exposure were coherent synthesis processing results were verified. Again, the principle of passive radar detection analysis, coherent synthesis and non-coherent synthesis of the target detection performance improvement, the superior performance of the radiation source passive radar target detection is verified by simulation. The CFAR detection principle of analysis and simulation. Finally, the radiation source passive radar simulation platform. Including signal generation, transmission, signal processing and detection module, which highlights the digital down conversion (DDC), Doppler processing and constant false alarm rate (CFAR) module design and implementation, and is given by the simulation platform the radiation source passive radar simulation results.