Research On Low Probability Of Interception Radar Technology

With the use of the Electronic Support Measure (ESM) and the Radar Warning Receiver (RWR), especially the Anti Radar Missile (ARM), the radar living conditions are serious threat. Low probability of interception (LPI) radar is precisely one novel system radar which proposed under this kind of environment. LPI attempts to use all kinds of possibility technology to avoid its signal intercepting by the interception receiver, and improves its own survivability.The first, the development of the low probability of interception (LPI) radar is introduced in this dissertation. Then, the interception factor of the LPI-R is analyzed, discussing each parameter of the radar influence on radar's low interception capacity and introducing the technology in the actual project which influences the interception factor in this dissertation. Because the choice of radar signal is the most important to LPI-R, some typical LPI signals are analyzed in the dissertation, including phase coded signal, linear frequency modulation signal (LFM), phase coded and linear frequency modulation composite signal and the signal based on orthogonal frequency division multiplexing (OFDM) technology. The signal analysis indicates that the signal based on OFDM has strong anti-noise characteristic and covert characteristic, and the OFDM technology has been maturely applied in communication field. The theoretical derivation, modeling and simulation are made for the signal based on OFDM in the dissertation. The OFDM radar system is also given out in the dissertation, including process of the launching and the receiving. During the signal process, we solve the problems of doppler frequency sensitivity and frequency resolving power.