Mainlobe compound jamming suppression method for airborne radar based on superimposed stepped frequency waveform

With the continuous development of modern electronic warfare technology, the main electromagnetic threat to radar has changed from single intentional jamming to compound jamming. The emergence of various new types of compound jamming poses a significant threat to the survival and operation of radars. In particular, modern high-power jammers have already been capable of generating both suppressive jamming and deceptive jamming simultaneously. In order to mitigate the threat of the mainlobe suppression-deception compound jamming and to ensure the normal operation of airborne radar, a mainlobe compound jamming suppression method for airborne radar based on superimposed stepped frequency waveform is proposed. In the first stage, the superimposed stepped frequency waveform is used as the transmitted waveform to obtain the echo data. Then, the frequency points covered by the suppressive jamming are eliminated from the echo data in combination with the prior information. In the second stage, the carrier frequency domain compensation is conducted on the data from which the suppressive jamming has been eliminated, enabling the false targets to be shifted to the same true range bin. The true target and clutter are blocked by the blocking matrix, and then adaptive filtering processing is carried out in the carrier frequency domain to achieve the suppression of deceptive jamming. Finally, the remaining clutter is suppressed by the space-time adaptive processing technology. The simulation results demonstrate that this method exhibits excellent performance in mainlobe compound jamming and clutter suppression.