Design method of smart jamming noise signal based on speed dragging

Abstract

The invention provides a smart jamming noise signal design method based on velocity pull-off and relates to the smart jamming noise signal design method. The smart jamming noise signal design method based on the velocity pull-off is put forward to solve the problem that false target track is easy to be cancelled by radar anti-interference when uncorrelated, so that the effect of suppression jamming cannot be achieved, and the effect of anti-jamming measures, such as echo sidelobe cancellation, is not good enough. The method is realized through the following steps: 1) calculating time delay tau; 2) calculating Doppler frequency shift fd obtained after an electromagnetic signal is reflected back to a radar antenna through secondary scattering of a target; 3) calculating the amplitude value At of a target echo signal at the time t after the electromagnetic signal is reflected back to the radar antenna through secondary scattering of the target; 4) calculating the target echo signal sr(t); and 5) increasing offset of the Doppler frequency shift fd. The method is applied to the smart jamming noise signal design field.

Description

technical field

[0001] The invention relates to a smart interference noise signal design method, in particular to a speed drag-based smart interference noise signal design method. Background technique

[0002] Assuming that the radar transmitted signal is a chirp signal s(t), its expression is:

[0003]

[0004] Among them, f 0 Is the carrier frequency, μ is the frequency modulation slope. Assuming that the target is a point target, the scattering cross-sectional area is σ, and the target distance is R, then the response function of the target is:

[0005] h(t)=σδ(t-τ R ) (2)

[0006] Among them, τ R =R / (2c), c is the speed of light, then the target echo is:

[0007]

[0008] Let the pulse compression factor of the signal processor be s * (-t), after matching filtering, the expression of the target echo after the pulse pressure is obtained is as follows:

[0009]

[0010] Let the spectrum of h(t) be H(f), and the spectrum of s(t) be S(f), then the spectrum o...

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