Key Technologies Of Wideband Digital Receivers

The wide-band digital receiver is one important developing branch of electronic reconnaissance receiver. The data acquisition is completed at intermediate frequency, and by using the system of data transporting rate convert, the subsequent signal processing is done at the digital domain. In this paper, two methods to realize the wide-band digital receiver are researched, they are frequency-guided receiver and channelized receiver. The key problems of designing and realizing the wide-band digital signals are researched, and methods to convert the data transporting rate under high data transporting rate are highlighted.The time-interleaved sample provides a way to acquire the high speed and accuracy data, in this paper, the problem of channel mismatch of time-interleaved sample system is analyzed and one method to correct the error which generated by this problem is proposed, the feasibility of the method is testified by simulation on Matlab. Through researching the DDC technology, one high-efficiency structure of DDC is designed. And to generate the NCO data, the DDS is simulated on Maxplus II. The problem of channel mismatch of quadrature demodulation is analyzed, a method to calculate the error is proposed, and the simulations are done to correct the error. A general structure for polyphase DFT channelizer is deducted. In the end of this paper, the WOLA structure of channelized receiver is introduced and the detecting methods of channelization output are discussed, and one signal detecting method which base on the instantaneous auto correlation is proposed.