Analysis And Implementation Of Radar Anti-jamming Technology

With the development of modern technology, the increasingly complex electromagnetic environment and interference pattern of ever-changing form a huge threat to the radar in the battlefield. Radar anti-jamming technology has gradually become the key issues of the modern radar. Adaptive sidelobe cancellation and sidelobe blanking are two important techniques for effective suppression of radar jamming. In the modern radar systems, it plays an indispensable role. Adaptive sidelobe cancellation is an effective suppression of oppressive jamming technology. Sidelobe blanking can inhibit low duty cycle high intensity pulse interference or storage and forward interference entering from the antenna sidelobe. For the narrow-band radar systems, adaptive sidelobe cancellation principle is clear and simple. However, due to the presence of multipath and inter-channel analog primary and secondary differences in each channel signal delay, the cancellation performance drops. Similarly, the time delay between the main channel and the other channels reduce the probability, improve radar false alarm rate. The main problem how to effectively suppress the smart combination of interference and jamming is currently to be addressed.In order to achieve radar refinement process, improve radar jamming capability, in this paper, the main signal processing unit of radar system is designed and implemented based on the improved requirements of some type of anti-jamming radar. It describes the workflow radar signal processing, and introduces the design and implementation of the system, about moving target detection, clutter map, constant false-alarm rate processing, key algorithm processing and anti-interference point asynchronous trace cohesion. Combining simulation and experimental data analysis, it gives the realization of the effect of each signal processing module analysis.Secondly, the paper focuses on the radar jamming technology. For different types of interference, the article analyzes the mechanism that generates and gives the corresponding anti-jamming measures. For the delay difference between the effects of multipath and channel, given the delay section based solutions, and study the relationship between the numbers of the delay section between the cancellations of the performance. In order to cope with the smart jamming,this paper proposes the method of sample selection criterion based on the maximum correlation coefficient, effectively improve the dexterity of interference suppression. In order to solve problem of channel delay caused by differences blackout decrease the probability, this paper studies a two-dimensional window sidelobe blackout, and the effect of window length of blackout probability. Field tests and measured data analysis shows that the radar system is a good anti-jamming performance, it can effectively suppress noise repressive, store and forward type dense false target, and inhibit the distance, azimuth, Doppler modulation style changeable of the smart interference.Finally, based on the ADSP-TS201 S general signal processing platform, this article analyzes the main problems of existing in the system function. It gives the radar signal processing software process, describes in detail sidelobe blanking system and adaptive sidelobe cancellation system’s digital signal processor(Digital Signal Processor, DSP) implementation. It describes the implementation of system software design, the data transmission, ping-pang parallel processing technology, and test functions, and gives guarantee for performance and real-time DSP solutions.