Interference Research On Early Warning Aircraft Using STAP Technology

The research in this paper is about jamming methods of early warning radar with the Space-Time Adaptive Processing.Firstly introduced the main effect of STAP technique, which solve the problem that clutter interfere the work under airborne seriously.Through constructing model of early warning radar, phased array pulse doppler radar, described in detail the working principle of early warning radar and how clutter of early-warning radar target jamming is.Then expounded the basic principle of STAP algorithm, the basic idea of STAP algorithm is processing module handle two dimensional data space and time at the same time, for clutter suppression to extract target information.Among them, the spatial data from N arrays, time data derived from the M pulse coherent processing time.Data of arrays N, M pulses and L adistance doors, makes up the 3 d data cube.When moving targets has been determined, in theory we can be convenient to calculate the best weights of space-time twodimensional filter, and then filter the output power.By constructing ideal STAP filter model-— — all dimensional space-time adaptive filter,discussed the basic principle of STAP algorithm in detail, and pointed out the limitation of STAP—— large amount of calculation,needing enough and sample data to be detected independent identically distributed(IID) of the training sample.All dimensional space-time adaptive filter is hard to engineering application;Then, interference feasibility of space-time adaptive processing are reviewed.This article use the rf interference technology with digital storage technology and direct digital synthesis technology, digital radio frequency(rf) storage technology is used to intercept the radar pulse signal of the radio frequency to save a certain amount of time,when needed, again; The effect of direct digital synthesis technique is to generate arbitrary waveform signal of want.Then, using the traditional methods of interference to disturb the radar with space-time adaptive processing technology, which was mainly noise suppressing jamming and false target deception jamming. Noise suppression of interference is based on the direct digital synthesizer signal noise mixing, narrowband noise interference; False target deception jamming is implemented through DRFM technology, The false target technology in this paper were delay forwarding interference, frontier forward copy loop interference and random interference with frequency shift forward, and then to evaluate the methods of performance analysis respectively.Finally aimed at the problem of low utilization of noise suppressing jamming power to STAP, this paper puted forward an improved interference method——convolution noisejamming.Analyzing the feasibility of this method first, and then expounding its basic working principle, at last, through the experiment to evaluate the jamming effect.Evaluation results show that the convolution noise jamming can completely get signal processing gain,can the thorough implementation to generate false target on a predetermined position, and also can produce very good suppression effect of the target signal.