Research On Key Technologies Of HF Wideband Multiplex Parallel Receiving System

Multiplex signal receiving is a basic problem in HF non cooperative communication.Based on the hardware of the HF Broadband Receiver and computer,considering the special needs of non cooperative communication,the subject has launched a series of research for key technologies aiming at the problem of multiplex signal receiving and narrow band signal processing.In this paper,the research of multiple x signal parallel reception and narrow band signal equalization is of theoretical innovation.This paper has practical significance in the practice of the innovation of the HF narrowband time-frequency analysis tool.In this paper,we firstly studied the performance index of the wideband receiver,analyzed the influence factors such as wideband ADC capability,DDC performance,presented the performance evaluation criterion and the implementation method of wideband receiver for narrow band receiving.The measurement and calculation of the actual signal confirmed that the output of the wideband receiver can be used in the narrow band receiving.In order to get the narrow band data from the broadband data,this paper designed the algorithm which combines the frequency-cross double uniform channelization and the channelization based on DDC realizing parallel output of multi-channel narrow band signals.In this paper,the output performance and computational complexity of the algorithm is analyzed and simulated in detail,the algorithm of the optimal structure parameters are obtained.The algorithm only needs a broadband receiver front-end in hardware,which can realize the receiving bandwidth of arbitrary frequency,arbitrary multiple narrowband output,with the excel ent performance and the high function-price ratio.This paper studied the HF narrowband signal blind equalization algorithm,focused on the analysis of the influence of step function on the performance of the algorit hm,designed a new variable step blind equalization algorithm based on MSE transform,proposed step function design principle and gave the method to realize the function,demonstrated the excellent performance of the new design of the step function through the simulation.Finally,this paper designed a new scheme for the HF narrowband signal time-frequency analysis tool,browsing system for HF narrow band frequency sweep data file.In the browsing system,the methods of the drawing and loading separately,multi line display,scrolling up and down display are used.Features and advantages are obvious in the aspects of the loading and display of the spectrum diagram of the browsing system.