Study On Anti-jamming Algorithm Based On Frequency Diverse Array

With the increasing complexity of the electromagnetic environment in the modern battlefield,the stability of the radar is facing severe challenges.The interference technology is developing rapidly at present.The development of anti-jamming technology is lagging behind relatively,which mainly manifest in the fact that the type of anti-jamming is single and the effect of deceptive jamming suppression is poor.Therefore,in order to ensure the reliability of radar,it is meaningful to research on anti-jamming technology deeply.Frequency diversity array(FDA)is a new type of array system.Because of the frequency offset between the carrier frequencies of the adjacent array elements,there increase the controllable range-dependent relative to the traditional array.The angle-range coupled of FDA is useful to against range-related jamming,which provides a new path for anti-jamming technology.This article analyzes the features of FDA based on its transmit model and receive model.And research on the anti-jamming methods on the airspace and frequency domains respectively,reply to the development needs.In the airspace domain,based on the angle-range coupled of FDA,the suppression of spatial distribution jamming is realized using the adaptive beam forming.And for the potential risks caused by the periodicity of frequency diversity array with fixed frequency offset,an adaptive anti-spatial distribution jamming method based on frequency diversity array with log-offset is proposed.By improving the array model,while suppressing the spatial distribution jamming,a single mapping relationship between the main peak and the target is ensured.In the frequency domain,the transmit-spatial frequency and receive-spatial frequency are extracted from the normalized steering vectors of FDA?s receive domain,which composed the frequency-domain signal processing model of FDA.On this basis,combining with the production mechanism of range-deception jamming,suppression of range-deception jamming is achieved via adaptive beam forming in frequency domain.And for the type of complex jamming that consists of deceptive jamming and repressive jamming,anti-compound jamming method is proposed in FDA?s frequency domain.Using the low side lobes of receiving pattern that present in the receive-spatial frequency dimension,which obtained by receiving vector reconstruction,the suppression of compound jamming is realized.