Evaluation Of Anti-jamming Capability Of Typical Radio Proximity Fuzes Based On Ambiguity Function Incision

Not only measurement principles and means for anti-jamming capability of radio proximity fuzes (RPF), but also the important basis for their anti-jamming technology guide-lines are characterized by its evaluation theory and methodology. Anti-jamming capability of RPF can be evaluated objectively and scientifically, which is a foundation and prerequisite for the effective usage of RPF and effective release of ammunition power. Several typical RPF are taken as research objects. Their equivalent generalized theoretical model is established. The anti-noise performance and anti-typical-barrage-jamming capability of the pseudo-random binary phase coded CW fuze as a representative of them are analyzed. The active jamming mechanism model is established. The evaluation theory and methodology for anti-jamming capability of RPF based on methodology of ambiguity function incision is proposed, which is applied to evaluating the anti-jamming capability of typical pulse fuzes and periodic modulation CW fuzes respectively. The main contributions are as followings:(1) Operation principles of the four typical pulse type fuzes such as pulse ranging fuze, pulse Doppler fuze, pseudo-random binary phase coded pulse ranging fuze and pseudo-random binary phase coded pulse Doppler fuze are summarized. Meanwhile, it also summarizes the operation principles of three typical CW type fuzes such as symmetric triangular frequency modulated CW fuze, sawtooth frequency modulated CW fuze and pseudo-random binary phase coded CW fuze. On this basis, these fuzes are realized on the basis of correlation reception, by analyzing and deducing the input/output signal of each module of fuzes. Equivalent generalized model of them is established.(2) anti-noise performance/anti-radio-frequency jamming capability, anti-FM-by-noise jamming capability, anti-AM-by-noise jamming capability of pseudo-random binary phase coded CW fuze are analyzed, which is by means of deriving the SNR/SJR of the fuze receiver based on Doppler effect. The jamming effect decreases in order of radio frequency jamming, FM-by-noise jamming, AM-by-noise jamming.(3) Cuts of ambiguity function for rectangular pulse signal at certain different Doppler shifts and time delays are analyzed. Ambiguity function of pulse coded by m-sequence is derived by the properties of m-sequence and the related probability theory. Fine structures around the original are described by the formula derived and simulation.(4) According to the properties of periodic ambiguity function (PAF) and the relationship between PAF and single PAF, the generalized PAF of CW signal modulated periodically is derived. The single PAF and PAF of symmetric triangular frequency modulated CW signal, sawtooth frequency modulated CW signal and pseudo-random binary phase coded CW signal are derived. Their cuts of ambiguity function for rectangular pulse signal at certain different Doppler shifts and time delays are analyzed. Their 3-D ambiguity patterns are analyzed also.(5) On the basis of the equivalent generalized model, active jamming mechanism model and the equivalent between ambiguity function, match filter and correlator, the evaluation theory and methodology for anti-jamming capability of RPF based on the methodology of ambiguity function incision is proposed.(6) The inherent anti-jamming capability of the typical fuzes is evaluated by the methodology of ambiguity function incision. Their inherent anti-jamming capability changing with their characteristic parameters is described. The comparisons of anti-jamming capability between them are analyzed.