| Modern radar countermeasures environment becomes more and more complex because of the dense radar signals and the varied radar signal forms. What’s more, various kinds of new type radars are from theoretical research into equipment and application. As the precondition and core of electronic countermeasures, radar reconnaissance requires to process radar signals more accurately and quickly. Focusing on the radar detection algorithm of simultaneous radar signals and the key technologies of DSP-based radar detection signal processor, main work of this thesis is as follows:1. In the case of simultaneous signals which are overlapped in time domain but separated in frequency domain and they can’t be separated by channelized, the signal separation with the method of frequency domain filtering is completed in DSP and the time domain data of each signal is obtained.2. Analyzing six kinds of radar signals including mono-pulse(MP), linear frequency modulation(LFM), “V†linear frequency modulation, binary phase shift keying(BPSK), Quaternary Phase Shift Keying(QPSK), Frequency Shift Keying(FSK) signal, recognition of modulation type is completed according to the time-frequency characteristic curve which is generated by the phase difference. Then parameter estimation of these six kinds of signals is researched and an improved Fourier coefficient interpolation iteration algorithm is proposed. Every algorithm is simulated and analyzed.3. Several frequently-used methods for radar signal sorting in the dense-pulse environment are researched and simulated. In addition, their advantages and disadvantages are compared. Then aiming at the frequency agility radar, time difference of arrival method for signal sorting is researched and simulated.4. The TMS320C6701-based processing system of simultaneous radar signals is structured and the key technologies of hardware implementation are analyzed. Finally, all the algorithms are emulated and tested in this processing system. |
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