| The PD radar is a new type of radar system based on the development in MTI .It is a full-coherent radar and is widely used which utilizes the Doppler Shift between the target and the radar to acquire and process target information. It can effieiently solve the interference from the strenth clutter. The pulse train of the PD radar has characteristics of the coherent ,So it often uses high repeat requency working mode in order to eliminate ambiguity in velocity measurement. At the same time,the higher working ratio is often used to reduce the peak power and maintain power. However, a series of ranging solving ambiguity method is formed for the ambiguity in the PD radar dependence pulse envelope method which caused by the above characteristic . The frequency modulation range principle is used by some of these PD radar. Ranging solving ambiguity pulse is used by carrier-frequency step motion while uses the high repetition frequency work. This method used PD radar original Doppler survey and the resolution fully, did not increase any processing hardware nearly, only the carrier frequency of transmitting signal needed to be modulated by carrying on a small slippery changes.it is also need to increases the corresponding signal processing software,then the unambiguity range could be realized under the high repetition frequency condition.Also,This method has certain anti-deceit disturbance ability. This method causes strong correlation between range and velocity Measurement.If the deceptive jamming signal cannot maintain this correlation of the distance and velocity, then it is easy to be recognized as a dummy target or jammed by the radar signal processing .Obviously, this kind of PD radar has the merit of high real-time and convenience.The thesis starts from operation principle of PD radar. We discuss the distance ambiguity and velocity ambiguity resolution of PD radar. Using high repeat frequency PD radar detection, there is existing range ambiguity problem.For this kind of radar, we have given many ways to solve this issue. The thesis present a method and implementation technology which is transmit frequency step-up to solve the range ambiguous based on the principles of Frequency Modulation Ranging. It also present the simulations.The PD have advantages including both in continuous wave radar and pulse radar ,so it has strong capabilities both in anti-noncoherent electronic jamming and noncoherent distance and velocity deception jamming. This thesis discuss the deception jamming based on DRFM . The signal processing main methods of this kind of PD radar is researched. In the DRFM, the correlation and contemporaneous of distance deception jamming and velocity deception jamming is realized by the improvement of the traditional DRFM. |
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