“探险者”宇宙飞船的长途通信线路采用了大约2200兆赫频率的接收和发射线路。宇宙飞船和地面站都使用锁相环接收机。为了防止由于游标发动机和制动发动机燃烧以及着陆时冲击引起的震动致使相位失锁,发射机和接收机必须符合如下的短期稳定度的要求,即在10赫到10千赫的3g(零—峰值)的震动条件下,在噪声带宽为425赫的锁相环中测得的最大相位抖动为45度(峰——峰值)。 The long-haul spacecraft for Explorers spacecraft uses receive and transmit lines at about 2200 MHz. Spacecraft and ground stations are using phase-locked loop receiver. To prevent loss of phase due to vibration caused by vernier and brake engine combustion and impact at impact upon landing, the transmitter and receiver must meet the short-term stability requirements of 3g (zero-to- Peak), the maximum phase jitter measured in a phase locked loop with a noise bandwidth of 425 Hz is 45 degrees (peak-to-peak).