The Research On High Speed And Efficiency Digital Channelized Receiver And Its Implementation

As the important part of passive radar seeker, the receiving and processing of the radar signals has been a hot point for research. With the appearance of LPI radar and frequency agility radar, the traditional receiver of passive radar seeker faces a great challenge. The traditional radar receiver adopts analog receiving mode, which has worse linear circuit and large temperature drift, so, the development of digital receiver has become a trend. In order to receive these wideband radar signals, the wideband digital receiver that has large instantaneous bandwidth, large dynamic and high sensitivity becomes a development demand. The channelized receiver, which has the whole probability receiving and ability of processing simultaneous arriving signals, has become a hot point for research of wideband digital receiver.The digital channelized technology and the subsequent processing technology were studied in detail in this paper. A set of digital channelized receiver was designed based on engineering application and the performance was tested.The paper has given the derivation of high-speed and efficient structure of the uniform digital channelized receiver based on polyphase filter and FFT. At the channelized subsequent processing, the CORDIC algorithm was adopted to extract signals'instantaneous amplitude and instantaneous phase, at the same time the phase difference algorithm was adopted to realize instantaneous frequency measurement. In the respect of hardwire implementation, high-speed ADC08D1000 was used to achieve data sampling, FPGA and DSP were used to achieve digital signal processing.