Study On Digital Channelization Technology Via Software Defined Radio

Channelization technology is one of the most critical technologies in current Electronic Warfare(EW), especially in two aspects that improving the operational performance and the effect of the investigation. For example, improving detection accuracy of detecting signals,increasing the accuracy of separating signals and etc.This paper is mainly devoted to that how to finish channel separation effectively in complex reception bandwidth. For example, doing channelization effectively in some contexts,including multiple narrowband in target bandwidth, wideband signal and changing spectrum.First, this paper reviews basic theories about channelization and software radio, which are considered as basis of research project. Second,this paper studies the realization scheme of uniform channelization. Facing the disadvantage that increasing this program performance need increase the consumption of system resources, we propose an improved program which is based on frequency response shielding technology. This program doesn't reduce performance and saves resources effectively as the same time. According to two characteristics that signals are divided into different sub-bands due to multi-channel analysis filter bank and sub-band signals can be reconstruction and recovery because of synthesis filter bank of meeting reconstruction condition, when one sub-signal covers some sub-band signals in the range of the target signal, we can recover this target signal by using this program.Non-uniform channelization implementation is used to realize sub-band decomposition for the signal of entire received bandwidth and then finish reconstruction for sub-band signals of different frequencies. This article also studies spectrum detection method of signal spectrum estimation. It is considered as prior information of channelization. Testing the program detection performance by modifying window function and signal overlap rate.This study also proves the method of signal spectrum detection and give a extraction method of non-uniform channelization. After that, we give an implementation of dynamic channelization and do standardized packaging for reconstruction function interface of signal.This program is realized and verified in software radio based on FPGA. Facts have proved that the separation of different frequency domain signal distribution is more accurate, and the spectrum changes can be adaptively adjust. This paper presents the verification of the theoretical issues of engineering design in FPGA, including pretreatment, spectrum detection,the sub-band decomposition. We write data extraction procedure based on C ++ MFC , a signal reconstruction program and parameter configuration interface program. We test the tested signal which generated by city's FM radio signals together with the signal generator.Finally, we verify the feasibility of the dynamic channel programs.