| High-resolution radar as an important sonar can further detect, trace and imagetargets all the time and all the weather. Thus, the high-resolution information can beachieved and recognized probability of target can be enhanced. Hence, high-resolutionradar plays a key role both in military and in citizen field, which is widely studied andattended for a long time.Usually, high-resolution radar signal is a classical non-stationary signal. Its frequencyfeature is variable as time changes. Thus, the traditional digital signal processingmethod can not be applied to describe the time-frequency feature of this kind of thesignal effectively. Time-frequency analysis method can show the instantaneousfrequency at the different time. Therefore, some researches aimed at the application ofthe time-frequency analysis in high-resolution radar signal processing and relatedsoftware realization are carried out in this thesis. The works can be revealed in details asfollows.Firstly, on the basis of radar signal analysis and processing theory is detailedintroduced, a new method of parameter extraction for radar Linear FrequencyModulation (LFM) signal based on time-frequency analysis and Hough transform isstudied. And some related simulations are executed by using the Matlab software.Simulation results show that the time-frequency feature of LFM signal can be describedvalidly and LFM signal parameters can be extracted exactly by using the proposedmethod. At the same time, simulation results also suggest that the method in this thesisis comparatively robust.Secondly, Gabor transform as a kind of classical time-frequency analysis method, isutilized to analyze the theoretical express of high-resolution radar micro-Doppler signalproduced by target’s turning or rotation. And some related simulations are carried outby using the Matlab software similarly. The correctness of the feature of turning orrotation micro-Doppler signal and the well time-frequency analysis capability of Gabortransform are validated. |
