Research On Cooperative Detection Operation Mode And Clutter Suppression Method Of Airborne Radar

The airborne early warning radar can detect targets hundreds of kilometers away and can be deployed flexibly.It has become an indispensable important equipment in the modern battlefield and the first blow target of the enemy.Large airbrone early warning radar is expensive and difficult to mass-produce.Once destroyed by the enemy,the army will immediately lose its long-range alert capability.The coverage area of large early warning aircraft is mostly circular in shape,so that large airborne early warning radar sometimes is unable to adapt to the complex combat environments.The use of several small and medium-sized early warning aircrafts working together to replace large early warning aircraft working may brings some benefits.The performance of cooperative detection is closely ratelated to cooperative operation mode.Therefore,it is of great significance to study the optimization method of cooperative operation mode.In addition,some radars can work passively by relying on echoes generated by other radar transmitting signals(ie,form an airborne bistatic radar).This type of echo is serious range-dependent which brings new challenges to radar clutter suppression.As a word,research on the range-dependence compensation technology of airborne bistatic radar is needed.Considering that multiple radars work together in the airspace,in order to fully exploit the potential of each radar and make the whole system obtain better detection performance(For example,maximize the detection distance or data rate when the data rate is constant or the detection distance is constant respectively),this paper proposes an optimization method of airbrone radar cooperative operation mode that maximizes detection efficiency.In addition,for the detection of cruise missiles and slow-speed small targets,an optimization method of airbrone radar cooperative operation mode for minimizing the minimum detectable speed is proposed.Aiming at the range-dependence of airborne bistatic radar clutter,a matrix transformation method of selecting the peak power point of the clutter to transform is studied,which improve clutter suppression performance by reducing clutter range-dependence.The main contents of this article are summarized as follows:1.The optimization method of airborne radar cooperative operation mode is proposed.Firstly,multiple beams are formed by received radar to cover the radiation range of the transmitting radar for the case of large bistatic angle.However it brings difficulties to effective data acquisition.The calculation formula of the received beam center and the beginning and ending time of the data acquisition of each beam are derived.On this basis,this paper proposes an optimization method of airbrone radar cooperative operation mode to maximize detection efficiency,which can fully utilize the resources of each radar and make the whole system obtain better detection performance as well.In addition,System fonction somestimes needs to be turned to mainly detect cruise missiles and low-altitude small targets,an optimization method of airbrone radar cooperative detection operation mode to minimize the minimum detectable speed is proposed.Finally,the cognitive time resource scheduling scheme under multi-target tracking state is studied.The target radar cross-sectional area prediction result based on echo is used to determine the time allocation ratio for the next exposure,which satisfys the accuracy of tracking requirements for small signal-to-noise ratio targets.2.Some radars may be configured to passively receive in some directions(equivalent to bistatic operation mode),which brings severe range-dependence to the clutter under the above-mentioned operation mode of multiple radars cooperative detection.Based on the construction of the echo model and the in-depth analysis of the bistatic clutter characteristics,a matrix transformation method of selecting the peak power points of clutter to transform is studied.The iterative adaptive method is used to estimate the power of the clutter spectrum The clutter points are selected at different intervals according to the clutter spectrum,which effectively reduce the range-dependence of the clutter and improve the clutter suppression performance.