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本文讨论了在捷变频雷达中由于系统的鉴频效应将本振的FM噪声转换为接收机AM噪声的原理;重点分析并推导了在具有快速自频调子系统的雷达中移相鉴频的形成过程及其对整机噪声的影响;提出了降低本振附加的FM噪声,减小系统的鉴频效应,使整机的附加噪声得以有效抑制的改进措施。这些措施已在雷达的实际应用中得到成功的验证。
In this paper, we discuss the principle of converting local oscillator FM noise into receiver AM noise due to the frequency-discriminating effect of the system in the frequency-agile radar. The formation of the phase-shifted frequency discrimination in radar with a fast self-tuning sub-system is emphatically analyzed and deduced Process and its impact on the noise of the whole machine; the improvement measures of reducing the additional FM noise of the local oscillator, reducing the frequency discrimination effect of the system and effectively suppressing the additional noise of the whole machine are proposed. These measures have been successfully verified in the practical application of radar.