MIL-DTL-52872 Sensor Group, Ultrasonic Motion: Transceiver Rt-1161/Fss-9\(V\) And Processor Mx-9444/Fss-9\(V\)This specification covers an ultrasonic motion signal transceiver and an ultrasonic motion signal processor which combine to form an ultrasonic motion sensor, designed to detect the motion of an intruder inside a protected space.