| Air defense missile plays an important role in modern war.The key for air defense missile to hit the target accurately lies in the seeker.Pulse doppler radar seeker has good velocity resolution,so it is widely used in air defense missiles.However,when detecting low altitude penetration targets,PD radar seeker will not only face natural environment interference such as multipath scattering and clutter,but also face passive or active interference jamming released by the enemy.In addition,radar seeker may also face Multiple target cluster penetration.Various jamming factors will lead to the decline of target detection performance of radar seeker.Cluster multi-target will cause large angle measurement error of radar seeker.How do these multi factors formed by environment and target affect the detection performance of radar seeker? What is the effect? These questions must be answered to improve the detection performance of radar seeker in complex electromagnetic environment.Therefore,analyzing the effect of multi factor combination on target detection and angle measurement performance of PD radar seeker can provide an important reference for the research of radar seeker detection method and angle measurement method,and has important military significance.Firstly,this paper gives the system composition,transmitted signal and received signal model of PD radar seeker,and studies the signal processing methods of radar seeker,such as pulse doppler processing,constant false alarm rate detection and angle information processing.In this chapter,the characteristics of multipath scattering,clutter and noise suppression jamming are analyzed,and the multipath scattering,clutter and noise suppression jamming are modeled respectively.Then,the scene of radar seeker detecting low altitude penetration target is constructed.Combined with the scene parameters,the received signals of Radar Seeker under multiple environmental elements are simulated,including target multipath scattering echo,clutter,noise suppression jamming and so on.Furthermore,the effects of multiple factors on the Doppler spectrum and target detection probability of radar seeker signal are simulated and analyzed.The results show that under the set scene,the target keeps a certain speed and flies towards the radar seeker.When the height of the radar seeker is more than 3000 meters,the influence of multipath scattering on the target echo can be ignored;When the altitude is below 3000 meters and the missile target distance is close,the influence of multipath scattering above level 3 sea state on the target echo can be ignored.When the seeker flies at an altitude of 1000 m and detects low altitude targets,when the target speed is greater than 46 m s,the main factor affecting the target detection of radar seeker is long-distance support jamming;When the target velocity is less than 46 m s,the main factor affecting the target detection of radar seeker is clutter..Aiming at the low altitude dual target scene detected by high repetition frequency PD radar seeker,the effects of different combination elements on Seeker detection and angle measurement in different scenes are analyzed.Specifically,the results of dual target angle measurement without self-defense jamming and the influence of single target ejection jamming on target detection and angle measurement of PD radar seeker are analyzed.Combined with these two scenarios,Various active self-defense jamming combinations released by dual targets at low altitude are analyzed The effect of(suppression jamming and suppression jamming,suppression jamming and deception jamming,deception jamming and deception jamming)on target detection and angle measurement of high repetition frequency PD radar seeker.The results show that in the set scene,most of the seeker angle measurement results are between the two target angles,and the angle measurement results are affected by the following factors: jamming power,seeker height and target height.direction of releasing interference signal.The more targets of the speed deception unit in the real target CFAR reference unit,the greater the dry signal ratio required to achieve the same false alarm number and the smaller the dry signal ratio required to achieve the same missing alarm number;In several scenarios of dual target deception jamming combination,each target releases one deception jamming,which has the greatest impact on radar seeker target detection.Under speed deception jamming and suppression jamming,when the suppression jamming power released by the enemy is large and the release of deception jamming is controlled,the target detection and angle measurement performance of radar seeker can be effectively affected.Finally,the main work and innovation of the full text are summarized. |
