关键词: 跟踪干扰, 数字对消, 信号估计, 仿真验证

Abstract:

Auti-follower jamming becomes a hot and difficult topic in frequency hopping (FH) communications. In order to solve the difficult problem of FH communications in achieving anti-follower jamming, this paper uses the digital cancellation method to mitigate follower jamming. According to the characteristics of follower jamming signals and tactics background, a method to estimate follower jamming signals is proposed to extract reference signals in digital cancellation. And then, a further cancellation about jamming signal and mixed signals is conducted to mitigate follower jamming signals. Finally, a hardware-in-the-loop simulation platform is built by using field programmable gate array (FPGA). Experiment results show that the proposed method is effective to mitigate follower jamming. Signal-to-interference ratio (SIR) promotion degrees are different with different jamming frequencies, and the jamming mitigation performance is affected by the interference intensity. The SIR promotion average can reach 10 dB when the variance of jamming signals varies from 0.75 to 1.5. When the variance is 0.25 or 2, the SIR promotion average is less than 8 dB.

Key words: follower jamming, digital cancellation, signal evaluation, simulation verification