A Doppler detector device includes means for transmitting signals into a field to be protected, means for generating a unit step signal from the Doppler shift signal, means for integrating the unit step signal, means for activating an alarm when the output of the integrating means reaches a predetermined threshold level, and a false alarm inhibitor including means for sampling the integrator output and for resetting the integrator if the output does not reach the predetermined threshold level within a predetermined time. The false alarm inhibitor prefera...
A security device comprising a Doppler principle detection device, means for generating an output signal from a Doppler shift signal developed by the detection device, an integrator for integrating the output signal, an alarm adapted to be activated when the output of the integrator reaches a predetermined threshold level, and a false alarm inhibitor including means for sampling the integrator output and for resetting the integrator if the integrator output does not reach said predetermined threshold level within a predetermined time, said inhibitor acti...
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