讨论了信号时长和差拍频率对雷达作用距离的影响；
The influence of time length and beat frequency on radar range is discussed.
用普通光电池，人们就能够探测到两个不同的激光之间的拍频。
With ordinary photocells, one can pick up the frequency between two different lasers.
用普通光电池，人们就能够探测到两个不同的激光之间的拍频。
With ordinary photocells, one can pick up the frequency between two different lasers.
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