Research On The Low Probability Of Intercept Radar Technology

With the development of the radar electronic countermeasure technology and theemergence of anti-radiation missile, the working and living environment that modernradar systems are facing is even worse. The hotspot of research on radar detectiontechnology is how to reduce the probability of radar detection. And low probability ofintercept radar technology can make radar system to reduce the probability from theelectronic countermeasures system intercept receiver and anti-radiation missile threat.The signal waveform design is to become one of the primary means of improving radarLPI performance. Therefore, this paper focused on the design of radar signal waveforms,the theoretical analysis and simulation of various LPI signal. It discusses themulti-carrier radar signal of the LPI performance and the PAPR suppression method.1. This thesis introduces the LPI radar development status and research backgroundbriefly. On this basis, it derives the radar intercept factor and discusses the impact of theparameters about radar for the intercept factor.2. On the basis of the theory of radar signal, it detailed analysis the performance ofLPI radar signals and simulates, including linear frequency modulation, phase codedsignal and some complex modulation signals. Compare the advantages anddisadvantages of each signal as well as the performance of low probability ofinterception and Algorithms of pulse compression.3. It analyses the multi-carrier phase-coded radar signal combined with OFDMtechnology. The analysis includes time domain and frequency domain, Ambiguityfunction, range resolution and speed resolution. Because of the OFDM signalpeak-to-average ratio is too high, so we proposes a method of inhibiting which usingcarrier frequency of amplitude weighted and phase weighted, and compares the impactof two methods for system’s PMEPR.The research results show that the pulse compression technology can improve theinstantaneous bandwidth of the radar and a radar transmitter signal constituted by amulti-carrier signal can enhance radar system LPI performance. This signal transmitsbeams simultaneously at different frequencies in order to reduce the frame scan time constraints on the integration time. In addition, the multi-carrier envelope of the radarsignal suppression method can effectively reduce the PAPR of the OFDM radar signal.