Double loop high speed vacuum suction system, spread to the surrounding air by the central.

双回路高速真空吸气系统，由中央向四周扩散吸气。

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When the system close -loop controlling is realized for lower frequency perturbation, the approximate diffraction limited line spread function can again be achieved on the image plane.

对于低频扰动，当系统实现闭环控制后，像面上线扩散函数已接近衍射极限。

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This paper discusses the despread of low signal to noise ratio of the direct sequence (DS) spread spectrum signals using intermediate-frequency recirculation summation loop (IFRSL).

本文讨论了用中频积累法实现低信噪比直接序列扩频信号的解扩。

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