very high frequency direction finding 甚高频测向

high-frequency direction finding 高频测向

medium-high frequency direction finding station 中高频测向台

high frequency direction-finding station 高频测向台

Fix Frequency Direction Finding 单频测向

high frequency direction finding 高频测向

medium frequency direction finding 中频测向

high frequency direction finding station 高频测向台

Frequency Band Direction Finding 频段测向