Research On Adaptive Anti-Jamming Based On Array Antenna Structure Optimization

Because of the satellite's unique wide area and high superiority,the satellite navigation system has become the most widely used navigation system with high accuracy,all-weather and global navigation.However,the satellite navigation signal is extremely weak when it reaches the ground and is easily disturbed by intentional or unintentional.Therefore,research on satellite navigation anti-jamming technology is of great significance.In the anti-jamming of satellite navigation,when the signal source and the interference source are related in the time domain and adjacent in the spatial domain,the traditional beam forming algorithm forms a zero-disturbance in the interference direction,so the desired signal will be suppressed,which will cause the distortion of desired signal and create an issue of unsatisfactory detection.Based on the above analysis,this paper studies on the condition that the number of channels is limited,and focuses on the adaptive anti-jamming technology based on spatial correlation coefficient optimization.The main content is summarized as follows:By deriving the relationship between output SINR and array number and spatial correlation coefficient,this paper analyzed the influence of spatial correlation coefficient of the output SINR under different dry-noise ratio conditions.By introducing the evaluation of spatial correlation coefficient,an Adaptive Anti-jamming Technique Based on planar array steering is proposed.By optimizing the steering of the line array,the space correlation coefficient of the desired signal and the interference signal is optimized to overcome the shortcoming of serious performance degradation of the array when the desired signal and the interference signal are adjacent to each other.Consequently,the SINR of the output signal is improved so as to improve the anti-jamming capability of the navigation system.For the source adjacent to the interference source airspace,it is expected that the signal reception gain is reduced and the receiver performance is affected.In this case,In practical engineering,taking into account the interference signal and the expected signal information to the existence of errors in the factors that define the average output signal to interference and noise ratio,I proposed an Adaptive Anti-jamming method for sparse optimization of array antennas under the constraints of orientation and direction finding precision.At the same time,the genetic algorithm is used to control the array structure to sparsely optimize the subarrayswith good performance from the uniform array at the fixed array element position,so as to reduce the influence of the desired satellite signal and jamming signal on the array structure Spatial correlation coefficient,which can improve the output SINR and enhance the anti-jamming capability and effective capturing performance of the satellite navigation system and improve the detection performance of the source and the noise source in the time domain,airspace adjacent satellite navigation signal.