Patent ID: 7817496

Claim:
A sensor for detecting moving objects with the use of an ultrawideband sounding signal, comprising: a first antenna and a second antenna; a pulse generator provided with two outputs, the first output being connected to an input/output of the first antenna and the second output being connected to an input/output of the second antenna, respectively; an input circuit comprising two detectors, an input of the first detector being connected to the input/output of the first antenna, and an input of the second detector being connected to the input/output of the second antenna; a differential amplifier; a feedback device; a low frequency filter; and a comparator; wherein an output of the first detector is connected to a first input of the differential amplifier, an output of the second detector is connected to a second input of the differential amplifier, an output of the differential amplifier is connected to an input of the low frequency filter and to an input of the feedback device which is intended for suppressing external noise of the sensor and which output is connected to one of the differential amplifier first and second inputs, an output of the low frequency filter is connected to an input of the comparator, a sensor operating threshold voltage is supplied to another input of the comparator, and an output of the comparator generates a sensor alarm signal.