Time filter

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Yao Y.,Nanjing Research Institute of Electronics Technology | Huang X.,Nanjing Research Institute of Electronics Technology | Wu G.,Nanjing Research Institute of Electronics Technology | Wei K.,Radar and Electronic Warfare Institute
IEEE National Radar Conference - Proceedings

In wideband digital array radars (DARs), channel equalization and fractional delay (FD) are needed for digital beamforming (DBF) since they can compensate the amplitude and phase imbalance between each channel as well as the aperture effect. Traditionally, the compensations were usually implemented separately via different finite impulse response (FIR) filters based on different design criterions. In this paper, equalization and FD are realized jointly in one FIR filter based on the Farrow structure that provides a general polynomial approximation. The presented filter provides satisfactory compensation performance for both the channel mismatch and the aperture effect with low complexity. Simulation results have confirmed the correctness and effectiveness of the joint filter design, showing that it's suitable for wideband DBF applications. © 2015 IEEE. Source

Ji D.-Z.,Radar and Electronic Warfare Institute | Ji D.-Z.,Air Force Engineer University Engineer College | Yang X.-L.,Radar and Electronic Warfare Institute | Wang G.-H.,Radar and Electronic Warfare Institute | And 2 more authors.
Xitong Fangzhen Xuebao / Journal of System Simulation

The problem of emitter target location was considered using a moving platform. Because this problem is a non-linear problem, many position algorithms are too sensitive to the initial coordinate value of emitter target. The accurate position is difficult to estimate. To solve this problem, a modified particle filter approach based on Minimum Mean Square Error was proposed. Then the modified method was applied on the problem of emitter target location. Its performance is better in the simulation. Source

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