Research On Digital Channelized IFM Receive Technology

In the design of radar reconnaissance receiver, generally have the characteristics including broadband instantaneous frequency coverage, good sensitivity and dynamic range, simultaneous signal detection, and fine frequency measurement. The channelized receiver covers these characteristics, but the traditional analog channelized receivers have the limitations, that is phase non-linearity, the amplitude gain non-consistent and so on. At present, the wideband digital receiver has the "bottleneck" question that the high speed ADC can not match low speed DSP processing ability. According to the question which the radar reconnaissance receiver in the design, this dissertation proposes a design method of channelized receiver based on poly-phase filters, and their corresponding theoretical analyses are given. The algorithms and conclusions in the dissertation are verified by a plenty of computer simulations. The main work of this dissertation contained following several aspects:In the dissertation we studied the characteristics of wideband digital receiver, the main question, solution method at present, proposed a design method of channelized receiver based on poly-phase filters .The computer simulations experiments were done, the performances analysed deeply.In the dissertation we studied the characteristics of frequency measurement about radar reconnaissance receiver, proposed one kind of instantaneous frequency measurement method based on the cordic algorithm and the one order phase difference algorithm, and the computer simulations were done, the frequency measurement precision was discussed in detail.Characteristics of FPGA of Stratix series of the ALTERA Corporation were introduced, FPGA hardware realization method of each part of the digital channelized IFM receiver was proposed, and the system FPGA hardware simulations were made in FPGA design software QuartusII, and frequency...