Lpi Radar Signal Design And Processing Technology Research

LPI(Low Probability of Interception) radar can prevent itself from interceptor while detecting targets. The research on LPI radar technology is very important for theory and practice. The dissertation focused on the LPI signal design, digital LPI signal processing, optical signal processing and large bandwidth antenna.On the signal design, we analysed the criteria for LPI radar in analogue field and finite field. The requirement on the sequence's auto-correlation was loosened after the research on ambiguity function. The candidate sequences were great broadened. We created a directive rule for LPI signal design. The conventional codes' fitness for LPI was valued. Bent function and sequence and high-form sequence were designed and analysed. It was found that they were fit for the LPI applications.On the digital signal processing, we studied the demand on compute ability for fast acquest. We designed a new signal form named DS-FH-TH signal which costs less in processing but without any lost on the LPI performance. Quick and accurate acquest of signal is critical for the utility of an LPI radar. The realization of quick acquest under very low SNR and big frequency shift is one of the key problems of LPI radar. We designed a new receiver which needs less computation spend without any decline of the performance of the radar.On the optical signal processing, we argumented the feasibility of optical processing for LPI radar application, then estimated the capability of optical signal processing under today's technology especially VLSI technology. We introduced the mechanism of SLM(Spatial Light Modulator), and designed a complex amplitude SLM. The detection of correlate peak is one of bottlenecks of optical signal processing in LPI radar. We devised the smart pixels and RAM camera to solve this problem. To acquire higher input speed, we studied the possibility of using a volume holographic storage as an input device for optical signal processing. We contrived a new optical correlator which can perform 1024-1024 2-dimensionality correlation per microsecond. The usage of time-integrating correlator in LPI radar was studied. The application of optical technology in the LPI radar was introduced.