The Research And Implementation Of Wideband Channelized Receiver

Channelized receiver has been widely used in EW(electronic warfare). In this master thesis, several traditional channellized technology are presented first, including the channellized technology based on parallel DDC(digital down converter), channellized technology based on polyphase filter, channellized technology based on the WOLA(weighted overlap-add) structure and dynamic channellized technology based on DFT(Discrete Fourier Transform) modulated filter banks. Countless applications have proved that these traditional channellized technologies are highly efficient under some circumstances. But in the case of ultra-wideband receiver, they may be complex, high cost and inefficient in resources utilization. In this thesis, two new direct IF(intermediate frequency) channellized technologies are proposed which can overcome the disadvantage of traditional channellized technologies, and they have certain dynamic characteristics.This thesis also studied the signal detector, including both the fixed threshold signal detector and CFAR(Constant False Alarm Rate) signal detector.This thesis also studied the parameters encoder of channelized receiver. The estimation algorithm of pulse amplitude, pulse width, RF(Radio Frequency) and time of arrival are studied. Since the CORDIC(Coordinate Rotation Digital Computer) algorithm is widly applicated in parameters encoder, its principle and error are discussed in detail.According to the theoretical research results, this thesis designs and realizes a wideband digital channelized receiver. This receiver features 1.5 GHz instantaneous bandwidth, 30 channels, 50 MHz bandwidth for each channel, and variable center frequency. The design uses single ADC for IF sampling, and uses single Virtex6-FPGA for channelizing and parameters encoding. The pulse description word is transmitted through 15 Rocket IO transceivers, which have total data rate of 30 Gbps.