Distributed Passive Radar For Location And Velocity Joint Estimation Research And Their Application

Passive radars does not transmit signals by itself,but utilizes non-cooperative signals to detect the targets.It has so many advantages such as environmental friendly,strong anti-interference ability.With the rapid progressing of mobile Internet technology,passive radar network,also known as distributed passive radar has drawn more and more attentions.The distributed passive radar will further improve the comprehensive capabilities of radar system,making up for the weakness of disability of transmitters.It has significant values to the application in low-altitude airspace management and combating terrorist activities such as "black flying" of UAVs.When setting up a distributed passive radar detection system,the optimization of station configuration is one of the most significant problems to be solved.The essence of topology optimization is to select a matched performance to evaluate the radar system,by optimizing this quantification we can achieve the topology optimization of radar system.At present,there are two kinds of quantification standards:first,maximize the coverage area of radar systems;second,optimize the missed detection probability or positioning accuracy.Different quantification standards will be proposed in kinds of scenarios by different purposes.In this paper,we studied it from the parameter estimation performance.Beginning with the Cramer-Rao bounds for joint location and velocity of distributed passive radar,we explored the influence on Cramer-Rao bounds from the topology elements and target fluctuation.Then,we constructed the optimization model of the topology elements including transmitters and receivers,and the detailed implementation methods to solve the optimization problems.Firstly,we introduced the basic knowledge of distributed passive radar and its technological difficulty.Then,we derived the closed-form expression of Cramer-Rao bounds for joint location and velocity of a DTMB-based distributed passive radar,and explored the influence on it from the topology elements and target fluctuation.After that,we constructed the optimization model of the topology elements including transmitters and receivers and proposed two specific types of practical application scenarios.By analyzed this two scenarios separately,we established the methods to solve the optimization problems and proposed detailed implementation methods,respectively.Finally,the effectiveness of these methods was verified by simulation analysis.