Research On Range Compression And Target Detection For Air-to-air Missile Radar Sceker

Air-to-Air missile is an airborne weapon fired from an aircraft to search and destroy another maneuvering aircraft or targets.Post local wars research showed that the air-to-air missiles played an important role in controlling air supremacy and winning the air-combat.During the past decades,Many countries invested great effort into air-to-air missile research and a few advanced air-to-air missiles were developed and equiped.As expected,many attention will be attracted in the field of developing new air-to-air missile in a few years.Tradional radar-guided air-to-air missiles mainly works on a HPRF mode with continuous-wave(CW).It takes an advantage of high duty cycle and large average power which results in a longer detection range.In addition,there are no doppler ambiguities for HPRF radar which is helpful for targets detection.Generally speaking,the doppler shift for targets are mostly located in non-clutter region for a HPRF mode.Unfortunately,the performance of detection and anti-jamming for tail targets with low altitude under the look-down condition in which the doppler of targets are buried in the clutter region,as well as the seriously range ambiguities,will be decreased.With the development of aircrafts and missiles,there is an urgent need to improve the performance of guidance system together with target detection.Fortunately,pulse compression technology can address the problems between the detection range and transmit power,it is not only get the doppler information but also range information which can improve the performance of missiles.The present work do some research on pulse compression and target detection technique for a radar seeker of air-to-air missile,as well as the system architecture design of signal process for seeker.Firstly,a brief introduction on the basic theory of pulse compression,as well as advantage and/or disadvantage of different implemented methods is provided.Meanwhile,comparisons and simulations for widely used linear FM chrip,Non-linear FM and phase code signal are provided.Then,a proper scheme of pulse compression for radar seeker is selected based on analysis of the key technology and charactirise of air-to-air missile.Following,widely used techniques are introduced,including the moving-target indicator(MTI),moving-target detection(MTD),constant false alarm rate(CFAR),waveform design methods.Based on the simulations and work modes as well as environments,proper methods of MTD and CFAR are chosen for radar seeker.Finally,the design schemes for HPRF and MPRF mode are implemented on the platform of radar seeker,the inter experiments prove the validity of the proposed design.In addition,some proposals are provided based on the results which can improve the performance of target-detection.