| Because of the towed radar active decoy (TRAD), the seeker fails to track the target accurately. The decoy leads to a wrong detection of target’s velocity, range and angle, so it has become one of the most serious threats to the seeker. To improve the capacity of the seeker, the research and application of anti-TRAD methods are particularly important in electronic countermeasures.This thesis is under the background of a signal processor development for HPRF-PD phased array radar seeker in the laboratory. Firstly, the detection and tracking algorithms of velocity, range and angle for HPRF-PD radar are introduced. Secondly, the effect of the TRAD interference on the radar seeker tracking loop is analyzed. Based on the analysis of the probability density function of the monopulse ratio, a detection algorithm of the presence of TRAD based on GLRT is proposed. A method of anti-interference is given and the simulation results combined with the actual attack scenario is presented, which validates the feasibility of the method.Thirdly, the design of the software for the radar signal processor is detailed, which adopts a combination structure of TI’s high performance TMS320C6678 multicore DSP and the embedded real-time operating system SYS/BIOS. The eight cores of the DSP are all assigned with tasks reasonably. A variety of communication methods between cores is utilized depending on actual demand. The real-time tracking process of the velocity-range-angle and the TRAD detecting are also implemented. At last, in cooperation with the target echo simulator, the feasibility and performance of anti-TRAD radar signal processor are verified. |
