| Because of its strong anti-interference ability, anti-interception capability and anti-fading ability, frequency-hopping technology has been a most effective measure to improve the anti-jamming ability in electronic antagonism environment. However, with the development of jamming technology and constant upgrade of electromagnetic countermeasure, it is unable to meet the needs of the modern battlefield simply by frequency-hopping technology to achieve anti-interference. Introducing spatial filtering technology to frequency hopping communication system is an important means.Firstly, this paper introduces the background and development of the frequency-hopping technology and common anti-interference technology. Secondly, different array models are analyzed to derive the flow pattern of each array model including uniform linear array, uniform circular array and rectangular array, illustrating that the number of array elements and element spacing have an influence on array performance. Then, the uniform linear array and uniform circular are simulated using the power inversion adaptive nulling algorithm and beamforming algorithm respectively. On this basis, an algorithm combined the power inversion algorithm with beam-forming algorithm is proposed. Beam-forming and null-steering can be archived simultaneously by application of the algorithm, and it doesn’t need estimate the DOA of the interference signal. For the uniform linear array, the anti jamming performance of the adaptive null-steering algorithm is analyzed from the perspective of the array pattern and the frequency spectrum.Finally, the paper makes the anti-jamming process for the wideband frequency hopping communication system. Through the reasonable design of the array layout and combined with the adaptive nulling algorithm, the problem that beam-forming and null-steering can’t be archived simultaneously due to the strong mutual coupling effect in low frequency is solved. At the same time, the bad real time capability of the beam-forming algorithm in the wideband frequency hopping communication system is improved, and the effective anti-interference is achieved. |
