| Summary: | 博士 === 國防大學理工學院 === 國防科學研究所 === 103 === Airborne pulse-Doppler radar is used to mitigate the interference of clutter as it detects or tracks target at a look-down environments. By inherent characteristics of a pulse Doppler radar, it has simultaneous advantages of the range recognition from pulse wave and of the speed detection from continuous wave. Most of all it has better performance of clutter suppression and moving target recognition in a strong clutter environment.
In our research on airborne pulse-Doppler radar, the primary topics are focused on the distribution of those spectra such as Doppler shift and ground clutter, the ambiguity of range and Doppler, the ability of target detection, false alarm rate…etc. In order to increase the clear range of spectrum for target detection, we must raise the pulse repetition rate of the pulse-Doppler radar. Since the power reflected from the clutter are higher than from the target, we used a notch filter to reject clutter interference to separate the true target signal and the ground clutter.
In this thesis we also treat the problems that actually happened in our airborne target detetor and give anti-cruise missile mode, clutter rejection methods which had been already verified in flight test. Finally we give the results of our research which showed good detecting and tracking capabilities.
Key words: Pulse-Doppler Radar, Pulse Repetition Frequency, Doppler frequency, Constant False Alarm Rate, Spectrum Distribution.
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