基于单比特FFT的Ka频段测控系统抗干扰方法

Anti-interference Method for Ka-band TT&C System Based on 1-bit FFT

摘要:

天基信息是获取战场情报的重要来源,为了保证数据快速落地,地面测控设备正朝着机动化,小型化方向发展；针对Ka频段测控系统抗窄带干扰消耗资源大、运算复杂的问题,提出一种基于单比特运算的抗干扰算法；首先,该算法采用单比特量化采样和单比特FFT运算,减小了FFT过程中运算量；其次,该算法对运算过程中的旋转因子进行量化投影,进一步简化了单比特FFT的运算过程,使算法可以通过单比特数加减运算实现；最后,时频联合进行处理,根据干扰频点和强度确定适合的陷波器消除干扰；通过性能仿真和样机验证,证明该算法与传统频域抗干扰算法相比,在保证抗干扰性能的同时,硬件资源消耗量大幅减少,有效减少了抗干扰过程的资源消耗和运算复杂度。

Abstract:

Space-based information is an important source for obtaining battlefield intelligence. To ensure rapid data delivery, ground tracking and control equipment is evolving towards mobility and miniaturization. In response to the high resource consumption and complex computations of Ka-band tracking and control systems in resisting narrowband interference, an anti-interference algorithm based on single-bit operations is proposed. Firstly, this algorithm employs single-bit quantization sampling and single-bit FFT operations, reducing the computational load during the FFT process. Secondly, it quantizes and projects the rotation factors in the operation process, further simplifying the single-bit FFT operation, enabling the algorithm to be implemented through single-bit addition and subtraction operations. Finally, it processes in the time-frequency domain jointly, determining the appropriate notch filter based on the interference frequency and intensity to eliminate interference. Through performance simulation and prototype verification, it is demonstrated that compared with traditional frequency-domain anti-interference algorithms, this algorithm significantly reduces hardware resource consumption while maintaining anti-interference performance, effectively reducing the resource consumption and computational complexity of the anti-interference process.