Adaptive Digital Channelization Technology For Wideband Receiver

Cross-channel adaptive wideband signal reception is the difficulty of digital channelization receiver and the hotspot of digital channelization research at home and abroad in recent years.Cross-channel problems occur when channelized signals are received.At the same time,for the phase coded signal,due to spectral spurious,there will be phase loss in channelized reception.Aiming at these problems,this paper studies adaptive channelization in time domain and frequency domain respectively.Aiming at several common receiver received signal,linear frequency modulation signal,phase coded signals and so on,discusses the basic principle and model of digital channelized analysis of traditional channelized receiver when receiving,such problems as possible channel blind area and traditional solutions,such as 50% overlap channel,and to summarize across the channel to receive the difficulty.The main research work and innovation of this thesis are as follows:1.Aiming at the problem of overlapping adjacent channels or blind areas in traditional digital channelization,a time domain adaptive channelization method is proposed based on tree structure channelization.In this method,the channel is divided into even and odd channels,and then the filter is analyzed and integrated.The time domain adaptive channelization method realizes the wide band signal receiving across the channel and reduces the signal distortion rate.Taking LFM signal as an example,the accuracy of receiving signal width increases from 95.57% to 99.75%.2.For the time domain adaptive channelization method,when receiving the phase coded signal,it needs to increase the channel to ensure the signal receiving accuracy and reduce the phase distortion.Based on the phase matching principle and frequency response masking principle,the frequency domain adaptive digital channelization algorithm is studied.Details the implementation steps of frequency domain adaptive channel,the time domain method and frequency domain adaptive channel adaptive channel method,the algorithm complexity and precision comparison shows that the time domain and frequency domain theory,as well as the similarities and differences of two methods and frequency domain adaptive channel simulation method is a good way to solve the time-domain adaptive channelized receiving phase coded signal phase distortion problem.3.Adaptive channel in time domain and frequency domain adaptive channelized signal detection,the comparative analysis of various methods for signal detection based on the detection probability and the computational complexity,and proposed the related double threshold detection used in time domain and frequency domain adaptive channel adaptive channelized neutron channel signal detection part,reduce the false alarm probability,improve the detection probability.