Three subjects-UWB radar antenna, UHF/VHF band receiver noise temperature, and the target detection from background, which are main factors in UWB SAR range equation, are studied.

从超宽带雷达天线、UHF/VHF波段接收机噪声温度以及最小可检测的信噪比三个方面研究了超宽带合成孔径雷达方程。

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The question raised by radio frequencies - microwaves or radio frequencies of the UHF or VHF band - was whether the electromagnetic could have a similar effect at very low levels.

无线电频率， 微波，或者超高无线电频率（VHF ）所带来的疑问是电磁环境在非常低能量的状态下是否也会引发类似的效果。

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The radio also has an extended range that provides access to low-band VHF.

该无线电系统还可扩展频率范围，提供低频段甚高频。

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Mr Matthews said kayakers should also carry a VHF marine band radio to call the coastguard on channel 16 if they get into difficulty.

BBC: Llangennith: Surfer rescues kayaker on Gower