Research On Passive Positioning Technology Based On External Radiation Source

Radar detection system based on external radiation source has excellent performance in anti-stealth and low-altitude penetration.In the multi-base station distributed external radiation source radar system,the power of external radiation sources such as communication,broadcasting signals and TV signals are strong and widely distributed,and the external radiation source signals and the multi-base station radar are distributed and coordinated to form a network,which makes the application prospect of external radiation source radar broader.However,the speed and accuracy of the common passive location of multi-base radar still need to be further improved in practical application.In this paper,focusing on the accuracy and speed of target location of multiple receiving stations under the radar system of external radiation source,the method of estimating the combined information of external radiation source and target location as well as the improved simulated annealing method are studied to accelerate the positioning speed.The main contents of the work are as follows:1.In view of the influence of clutter and noise of the surrounding environment on the work of the external radiation source radar,the sorting and purification of the external radiation source signal were first studied.The relatively pure direct wave and target echo were obtained by ECA clutter suppression method.2.In the context of passive positioning of a single target by multiple radar receiving stations,two kinds of positioning algorithms were derived: the secondary positioning algorithm based on TDOA and the positioning algorithm based on DPD(signal known and unknown).The accuracy performance of the secondary TDOA positioning and DPD was analyzed and verified.3.Aiming at the problem of external radiation radar's multi-target passive positioning,the unknown number of targets and the known musk-dpd and mvdr-dpd passive positioning algorithms are derived respectively.Then,in the case of unknown external radiation information,an estimation method of combining external radiation source information with target location is proposed,and the influence of some parameters on the passive location performance of two multi-targets is analyzed and verified in detail.4.In view of the outside source of multi-objective passive radar directly locate the complexity of the problem,the intelligent search of traditional simulated annealing algorithm,and on this basis,to join the dual temperature control,the idea of differential evolution,cross selection and so on has carried on the improved variety,and the cluster particles in the airspace and range of gaussian kernel function under the constraint of group division,make after fusion classification cluster with multiple targets.5.Considering the problem of particle overload caused by the number of targets,a global optimization algorithm of multi-objective solution coupling is proposed,which transforms the multi-extremum search problem into the unipolar value problem of multiple global searches,and further optimization is carried out in combination with the actual scenario.The above work has been simulated and verified.The passive positioning technology based on external radiation source studied in this paper can increase its speed to twice as much without losing the positioning accuracy and solve the problem of the unknown number of targets.