提出利用双向载波捕获体制(双捕)提高通信链路的抗干扰性能,并分析其抗干扰机理。通过准线性和判断环路主导权的方法,得到了载波完成错锁环路正确频率牵引所需的载波-干扰功率比,定量地评价了双捕的抗干扰性能;同时给出了载波-干扰功率比与载波扫描速率、环路自然谐振频率和干扰频率关系的经验公式。数值仿真结果表明,优化环路设计和扫描频率后,可将完成错锁环路正确频率牵引所需的载波-干扰功率比降到1dB以下,与理论分析结果一致。 Proposed the use of two-way carrier capture system (dual capture) to improve the communication link anti-jamming performance, and analysis of anti-jamming mechanism. Through the quasi-linearity and the method of determining the loop dominance, the carrier-to-interference power ratio required for the carrier to complete the correct frequency pulling of the wrong-locked loop is obtained, and the anti-jamming performance of the dual-capture is evaluated quantitatively. At the same time, Power ratio and carrier sweep rate, loop natural resonant frequency and interference frequency of the empirical formula. The numerical simulation results show that after optimizing the loop design and scanning frequency, the carrier-to-interference power ratio required to achieve the correct frequency-pulling of the mis-locked loop can be reduced below 1 dB, which is consistent with the theoretical analysis.