The Design Of High Speed And Efficiency Channelized Receiver And Its Implementation

With the rapid development of technology on radar, the receiver,which is used in the electronic warfare, is required to have a broad instant frequency band, a high sensitivity and a broad dynamic range, to be able to detect multiple signals arrived simultaneously, and to have Real-time processing capacity as well. Based on the software radio theory , band pass sampling theory and Multi-rate sampling theory, this paper discusses the basic elements of channelized receiver of high speed and efficient which is based on polyphase filter and the actual implementation of hardware. The scheme reduces the computational rate and the amount of computation greatly which uses the efficiency of polyphase filter and the flexibility of FFT, and it can actualize real-time processing to the signal.In this dissertation, we mainly study the efficient architecture of channelized digital receiver,discuss the particular realization approaches,then testify them with simulation and do tests of system performance. Above all,the basic theory of digital receiver,such as the technique of sample, multirate signal processing,digital down converter, is introduced. Based on upper study deeply the efficient digital channelized architectures based DFT polyphase filter banks to deduce and establish a channelized digital receiver mathematic model for real signal. Simulation results show that the method has the capability of whole probability intercept and capture to broad band signal and testifie the receiver mathematic model as well. At last,we put forward several guidelines of the receiver on the basis of analyzing theories, and we implement the algorithm by setting up the hardware platform of broad band channelized receiver. By tests, this platform achieve the anticipative design ones and meet the need of radar reconnaissance.