Research And Development Of New Integrative Radar Reconnaissance Receiver Of Frequency And Direction Simultaneous Measuring——Signal Processor

In the past or nowadays, the radar reconnaissance receiver always plays an important role in electronic-war (EW). What the reconnaissance receiver faces is unknown electromagnetic circumstance, further more, some of the signals are especially designed to evade being intercepted. Along with increasing complexity and denseness of battle electromagnetic signals in modern EW, the traditional receivers, which are composed of a set of frequency measuring system and a set of direction-finding system with an antenna array, become more and more complex and cannot well satis1~?the need of EW any more in technology and performance. It is urgent to research and develop new system of reconnaissance receiver with the properties of powerful performance, miniaturization and integration. A representative new system is an integrative receiver of frequency measuring and direction finding, which is based on superresolution and high precision spectral estimation theory.In this dissertation, the main aim is to research and develop an integrative reconnaissance receiver with the ability to simultaneous frequency and two-dimensional (2D) angles of arrival (AOA) measuring. The following aspects are studied and gain some valuable results.The array signal data models of element-space and beam-space with spatial-temporal subNyquist sampling are formulated. The slope K of frequency aliasing function is countered as one of the model parameter to denote the influence of temporal sub-Nyquist sampling in the data model.The total scheme of new system radar reconnaissance receiver with wide instantaneous bandwidth and wide band range is designed. It accomplishes the purpose to simultaneous estimate both carrier frequency and 2D AOA with one set array system.The non-aliasing frequency estimation method is studied, it抯 pointed out that using high precision indirect method of spectral estimation will fulfil the precision and resolution demand of modern EW.A necessary condition of array antennas configuration is proposed. It ensures the uniqueness of AOA estimation solved by integral search method.An algorithm base on Pro-ESPRIT and MR-ESPRIT of simultaneous estimation of frequency and 2D AOA with spatial-temporal sub-Nyquist sampling is proposed. The frequency estimation algorithm is suit for arbitrary geometry of antenna array.A remedy for the blind spot in frequency estimating method using temporal sub-Nyquist sampling is proposed.Considering the offered performance of the frequency and 2D AOA estimation algorithmand the practical environment of EW, apply spatial smoothing method to non-unitary linear array and beam-space data to implement the frequency and 2D AOA estimation of coherent signals.Signal processor of new system reconnaissance receiver is developed. Investigation reveals no such a similar signal processor developed in other domestic and overseas institute, it抯 appraised as an advanced signal processor in 90抯 all over the world by EW experts.