The purpose of this chapter is to familiarize the reader with the basic propagation characteristics that describe various wireless communication channels, such as terrestrial, atmospheric, and ionospheric for VHF to the X-band. Well-known stand

种定位算法都具有较好的定位解算能力，解算效率和精度较高。-f navigation aids was born. These included radio beacons, vhf omnidirectional radios (VORs), long-range radio navigation (LORAN),

D_矩阵在超短波设备综合诊断中的设计D_ matrix in the VHF equipment in the design of comprehensive diagnosis-D_ matrix in the VHF equipment in the design of comprehensive diagnosis

无线电常用单位转换（测两点之间损耗 、自由空间损耗、接收端场强 DBM、手台和中继间通讯距离、毫瓦转DBM、DBM转MW 、八木天线增益的估算、两个VHF电台不同高度通讯距离估算）-radio unit transform