Function test and calibration self-heterodyne curve for direction finder on sea trial.
Function test and calibration self-heterodyne curve for direction finder on sea trial.
航行试验中测向仪效用试验及自差曲线校正。
Function test and calibration self-heterodyne curve for direction finder on sea trial.
航行试验中测向仪效用试验及自差曲线校正。