Research Of Wideband Digital Radar Reconnaissance Receivers

Along with the development of A/D device and the improvement of DSP speed, the research of radar reconnaissance receivers concentrate on wideband digital receivers. The paper bring forward a IF digital radar reconnaissance receivers structure based on bandpass sampling on the base of device development. The paper aims at the implement of the digital radar reconnaissance receivers. The following aspects are studied and gain some valuable results: 1, The receivers system's work parameters is acquired according to the requirement of the system and the feature of receive signal.2, the research of digital down conversion. 3, We must considered the hardware resource in the process of the digital implement because of the multi parallel structure. A method of the implement of FIR filter is given out based on the improved distributed arithmetic method to save the FPGA hardware resource. The hardware simulation of the wideband digital radar reconnaissance receivers is also given out using VHDL in this paper.The paper also researched measure method of the radar signal frequency and the estimation of AOA according to the requirement of radar reconnaissance receivers. A frequency measure method is given out based on digital phase measurement. This method can measure the frequency of two signals which arrive at the same time. To solve the problem of phase ambiguity in the phase interferometer measurement system, a new method for eliminating phase ambiguity is given out. This new method can deal with the two fuzzy data and acquire the exact data.