| Hyper/hyper-sonic anti-ship missiles have excellent penetration and strike capabilities,and are an important development direction for future anti-ship missiles.Compared with the traditional low-repetition instantaneous bandwidth radar and low-repetition step-frequency synthetic broadband radar,the highrepetition random frequency-hopping synthetic broadband coherent radar has stronger target detection,low-interception and anti-jamming capabilities.Applying the new system of high repetition frequency random frequency hopping radar to super/hyper-sonic anti-ship missiles can effectively solve the problems of target detection,low interception and anti-jamming in the process of missile terminal guidance.In this paper,aiming at the application background of hyper/hyper-sonic anti-ship missiles and the new system of high repetition frequency random frequency hopping synthesis broadband,for long accumulation time/large-scale cross-sampling unit distance walking/special distance-Doppler coupling in the case of distance-Doppler For two-dimensional imaging,a sub-aperture imaging based on sub-pixel-level range-walk bias and a sub-aperture synthesis method based on pixel-level range-walk alignment are proposed;for the evaluation of the"low interception" performance of the new radar system,a guided radar detection method is proposed.The low-acquisition waveform parameter design and the lowacquisition performance evaluation method under performance constraints are carried out,and the imaging performance and low-acquisition performance of the radar are effectively evaluated through experimental simulation.In the sub-aperture imaging method,the acceleration compensation is performed through inertial navigation information,the reasonable sub-aperture division is determined by the average frequency hopping interval,and the distance travel of scatterers on different velocity channels in the accumulation time is decomposed into pixel-level and sub-pixel level.In the two parts,the subpixel-level distance walk correction is realized through offset sub-aperture imaging,and the synthesis and coherent accumulation of each sub-aperture image are realized through pixel-level distance walk alignment.This method effectively solves the high-resolution range-Doppler two-dimensional imaging in the case of hyper-sonic speed/long accumulation time/random frequency hopping synthetic broadband.In the evaluation of low interception performance,the basic principle of high repetition frequency stochastic frequency hopping radar to achieve low interception is firstly analyzed and pointed out,and then the parameter design method of low interception waveform is proposed for ship target detection in the background of sea clutter.For square-law accumulation detection,the analysis method of radar target detection performance and reconnaissance interception performance based on chi-square test is analyzed and proposed,and the equivalent output signal-to-noise ratio gain of non-coherent accumulation with sufficient degrees of freedom and constraints is given.The relationship between the number of data accumulation points and the bias factor,the value of the bias factor is deduced.Finally,according to the typical application scenarios and typical parameter design,under the given detection performance constraints,the performance of the new radar system is quantitatively evaluated."Low Intercept"performance.The experimental results of this paper show that sub-aperture synthetic imaging can solve the high-resolution imaging problem in the case of long accumulation time/large-scale cross-sampling unit distance walking;the combination of high repetition frequency and random frequency hopping can significantly improve the performance of synthetic broadband radar signals.Low interception performance. |
