二次雷达S模式询问信号的解调译码实现

摘要

Demodulation and decoding of secondary radar signal is one of the main tasks to ensure the air traffic control system to communicate normally. To demodulate and decode the secondary radar signal more accurately, one quadrature demodulation method was presented, which based on the signal pulse characteristics and was different from the traditional way of carrier recovery. This approach orthogonally demodulated the secondary radar query signals that modulated by ASK, DPSK, and then obtained the signal envelope and instantaneous phase information to realize the signal recovery finally. The experiment results proved that S mode query signal was demodulated and decoded correctly by this method.%二次雷达信号的解调译码是空中交通管制系统实现正常通信的主要任务之一.在与传统的载波恢复实现解调的方法比较下,为了更加准确有效地实现二次雷达信号的解调译码,提出了一种根据信号脉内特征信息实现信号解调的方法.该方法将经过ASK、DPSK等方式调制的二次雷达S模式询问信号进行正交解调,获得信号包络与瞬时相位信息,实现信号恢复.通过实验验证,使用该方法能正确解译S模式询问信号.