The Research On Sorting And Recognition Of Pulse-to-Pulse Various Waveform Radar Signals

The sorting device of radar signals is one of the pivotal components of radar detector. It always needs rapid data processing capability, high real-time performance and little volume. With rapid development of radar technique, radar signal becomes more and more complicated, and the real-time processing performance of traditional sorting and tracking system faces great challenge. This dissertation is centred on the algorithm of signal sorting and recognition . Besides, the algorithm has been tested in the hardware system. At the same time, the theory of the sorting and recognition signal is also analyzed in the dissertation.Firstly, this dissertation represents the problems of signal sorting under high pulse density condition. The complicated environment of radar signal is analyzed, and several traditional methods are compared and analysised. A new method, which removes the conventional radar signals using SDIF algorithm before sorting the radar signals with agile PRI using parameter-matching algorithm, is proposed.Secondly, the dissertation investgates the inner feature of receiving signal. As clarifying the conception of the inner character, it gets the instantaneous frequency base on the instantaneous self-correlation of receiving signal. And put the result into the matching filter designed in the system. The practical applications of this method also are mentioned in the thesis.Thirdly, the dissertation gives details to the design of matching filter. According to the relation between the matching filter and signal processing, it puts forward the multi-channel matching model based on the traditional digital matching filter design theory. And based on the successful matching signals, it can also get the hardware design of system for future procession. The simulation result shows that this design has potential value for the whole system.Finally, according to the acqirements of system, the hardware design that is based on DSP (TMS320C6202) and FPGA, working procedure and software flow chart are given. After debugging, it implements the functions of sub-system design which gets the sorted and tracked signals through the series interface of the computer, and also realizes the inosculation with other sub-systems. The design of the circuit structure and correlative program is introduced in detail. The test result shows that the alogrithsm analysised and designs can successfully realize the sorting and tracking functions that the system needs.It has been proved that this new sorting and tracking sub-system has better identification performance for various radar signals' waveforms.