| The Linear Frequency Modulation (LFM) pulse compression signal is analyzed, in combination with technical and tactical specification of a certain fuse, this paper researches the generation of LFM signal as well as the engineering design.LFM signal is a kind of big product of bandwidth and timewidth by nonlinear phase modulation. The bandwidth and timewidth LFM signal could be independent choose to obtain good distance resolution and speed resolution. What's more, LFM signal is insensitive to Doppler frequency shift, which means the signal processing is easy.The periodic ambiguity function (PAF) is a tool for analyzing the performance of a radar system utilizing a periodically modulated signal and a receiver matched to one or several periods thereof. The PAF is a generalization of the periodic autocorrelation function, to the case of non-zero Doppler shift. The PAF of LFM signal shows the Doppler axis is being compressed with direct ratio of number of period, this bring the result that Doppler resolution enhanced.For DDS has Micro-Hertz turning resolution, complete digital control, fast "hopping speed" and phase-continuous frequency hops advantages, system employs AD9854 for LFM signal generation and AD8346 for single sideband modulation. System design on hardware and software are both illustrated. |
PDF Full Text Request