초록 ▼

An apparatus and method for varying the sampling frequency of a Doppler effect device, based on environmental conditions, is described comprising: (i) a transmitter for transmitting energy into a protected area; (ii) a receiver for receiving energy reflected from the protected area and for transform

An apparatus and method for varying the sampling frequency of a Doppler effect device, based on environmental conditions, is described comprising: (i) a transmitter for transmitting energy into a protected area; (ii) a receiver for receiving energy reflected from the protected area and for transforming the received energy into a motion detection signal which is proportional to any Doppler energy received by the receiver; (iii) a processor responsive to the motion detection and operative to automatically modify the sampling frequency when the motion detection signal exceeds a predetermined threshold value and the apparatus has not been operated at each of a plurality of sampling frequencies; and (iv) an alarm coupled to the processor activated when the motion detection signal exceeds the predetermined threshold value and the apparatus has been operated at each of the plurality of sampling frequencies. The device is useful in minimizing unstable Doppler effect channels in both single and dual technology devices.

대표청구항 ▼

A Doppler effect intrusion alarm apparatus operable to detect intruders at a plurality of sampling frequencies comprising: transmitter means of said apparatus for transmitting energy into a protected area; receiver means of said apparatus for receiving energy reflected from said protected area and f

A Doppler effect intrusion alarm apparatus operable to detect intruders at a plurality of sampling frequencies comprising: transmitter means of said apparatus for transmitting energy into a protected area; receiver means of said apparatus for receiving energy reflected from said protected area and for transforming said received energy into a motion detection signal which is proportional to any Doppler energy received by said receiver means; processing means responsive to said motion detection signal and operative to automatically modify said sampling frequency when said motion detection signal exceeds a predetermined threshold value and said apparatus has not been operated at each of said plurality of sampling frequencies; and alarm generating means coupled to said processing means activated when said motion detection signal exceeds said predetermined threshold value and said apparatus has been operated at each of said plurality of sampling frequencies.