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一、引言1947年ITU在《国际无线电规则》中分配给民航使用的VHF频段为118-137MHz,若采用25KHz为信道间隔,共760个信道。除了应急、搜索救援和保留给地空数据链VDL的信道,实际可指配的信道为600多个。为解决飞行繁忙区域的通信容量不足,EUROCONTROL在欧洲的部分地区采用8.33KHz的频率间隔,从而使可指配的信道数量大大增加。ICAO对8.33KHz间隔也增加了相应的技术规范。
I. INTRODUCTION The 1947 VHF frequency band allocated to civil aviation by the ITU in the International Radio Regulations is 118-137 MHz. If 25 kHz is used for channel spacing, a total of 760 channels are used. In addition to emergency, search and rescue and reserved for the air-ground data link VDL channel, the actual assignable channel is more than 600. In order to address the lack of communications capacity in areas with heavy traffic, EUROCONTROL uses a frequency separation of 8.33 kHz in parts of Europe, resulting in a significant increase in the number of assignable channels. ICAO also added the corresponding specifications for the 8.33 kHz interval.