多频观测
Multi-frequency Observation
多频观测器
multiple frequency observer
观测频带
Observational frequency band
基本综观观测
principal synoptic observation
间综观观测
intermediate synoptic observation
三频观测值
triple frequency observations
伪随机多频观测
pseudo-random multi-frequency
pseudorandom multi-frequency
有效观测频带
effective observation frequency band
最低观测频率
lowest observed frequency
测频测周
frequency and period measuring method
frequency and periodical signal measuring