To meet the need of miniaturization, the method of phase locked in microwave band and then multiplying into millimeter wave band is applied, and the super-small, ordinary 10 MHz crystal oscillator is chosen in the system. 为了满足系统小型化要求,采用微波频段锁定后倍频到毫米波频段的锁相倍频方案,选用超小型、无任何补偿措施的普通10MHz晶振。