对于使用高脉冲重复频率的主动多普勒雷达导引头，连续波近似法不仅计算相对简单，而且可以给出较高的计算精度。
For a Doppler radar homing seeker with high pulse repetition frequency, the continuous wave approximation is not only simple, but also has a high calculation accuracy.
伪随机三频波激电法能够计算三个幅频率和三个相对相位差，相对相位差能够很大程度上区分金属矿勘探中的碳质层。
The three breadth frequencies and three relative phase differences can be measured with the pseudo-random tripe-frequency IP method.
这两种方法各有特点：频率域法的鲁棒性强，而空间域方法相对精确度更高。
Both types have their own advantages: frequency domain methods have strong robustness, while spatial domain methods have higher accuracy.
交流注入信号频率本文选择60 Hz，相对与S信号注入法，称为低频交流注入法。
Compared with the injected s signal technique, this method is called low frequency AC signal injection method.
交流注入信号频率本文选择60 Hz，相对与S信号注入法，称为低频交流注入法。
Compared with the injected s signal technique, this method is called low frequency AC signal injection method.
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