Intrusion detection apparatus having supervisory control means

Claim 2

An intrusion detection system, comprising a microwave transmitter means for radiating a microwave field into an area, receiver means for receiving said energy, an amplifying means connected to the output of the receiver means and having a selected gain characteristic including a first gain portion over a selected frequency range related to selected motion of a target within said microwave field and a different and lesser gain portion with frequencies above said frequency range, discriminating means connected to said amplifying means to detect signals within said first gain portion, and a supervisory modulating means coupled to the transmitter means to modulate the transmitter field and establishing a supervisory signal in said amplifying means having a frequency within said lesser gain portion, and a supervisory response means connected to said amplifying means and responsive to said supervisory signal.

Claim 3

The intrusion detection system of claim 1, wherein said modulating means includes means to adjust the frequency and the amplitude of the supervisory signal and said supervisory response means having means to correspondingly adjust the response to said supervisory signal.

Claim 4

The intrusion detection system of claim 1, wherein said discriminating means is responsive to signals of a predetermined minimum amplitude within said first gain portion, and having second discriminating means connected to said amplifying means and responding to an output signal of a predetermined greater amplitude than said predetermined minimum amplitude.

Claim 5

The intrusion detection system of claim 1, wherein said transmitter means includes a solid state Clapp oscillator having a coaxial cavity, a solid state direct current voltage regulator having a series connected transistor regulating the bias supply to said Clapp oscillator and biasing said oscillator to generate said microwave field, said modulating means including a multivibrator circuit establishing an alternating current output voltage within said decreasing gain portion and having a variable resistor to vary the amplitude of the voltage and a variable capacitor to vary the frequency of the voltage, the multivibrator circuit being connected to modulate said voltage regulator and thereby the bias supply to said Clapp oscillator to establish said modulation of the transmitted signal, said amplifying means including an adjustable load resistor connecting the amplifying means to the discriminating means and producing gain adjustment of the amplifying means, said supervisory response means including a tunable band pass filter directly connected to the output of the amplifying means and to an output responsive means.

Claim 6

The intrusion detection system of claim 4, having a second voltage regulator connected as the bias supply to said receiving means and to said multivibrator circuit.

Claim 7

The intrusion detection system of claim 1, wherein said transmitter means includes a solid state microwave oscillator having a regulated direct current bias supply, said supervisory modulating means is a solid state multivibrator coupled to modulate the bias supply of the transmitter.

Claim 8

The intrusion detection system of claim 6, wherein said multivibrator includes an adjustable capacitor means connected in the circuit of the multivibrator to adjust the frequency and an adjustable resistor connected in the circuit of the multivibrator to adjust the amplitude of the supervisory signal.

Claim 9

The intrusion detection system of claim 1, wherein said first gain portion is a relatively constant gain over said related frequency range and the lesser gain portion is a progressively decreasing gain with increasing frequencies, and said discriminating means is responsive to signals of a predetermined minimum amplitude.

Claim 10

The intrusion detection system of claim 8, wherein said transmitter means iNcludes a solid state oscillator having a coaxial transmitting cavity, a solid state direct current voltage regulator connected as the bias supply to said oscillator to generate said microwave field, said modulating means including a solid state supervisory oscillator establishing an alternating current output voltage of a frequency within said decreasin gain portion and having a variable resistor connected in the circuit of the oscillator to vary the amplitude of the voltage and a variable capacitor connected in the circuit of the oscillator to vary the frequency of the voltage, the supervisory oscillator being connected to modulate said regulator and thereby the bias supply to said first solid state oscillator to establish said modulation of the transmitted field.

Claim 11

The intrusion detection system of claim 9 having a variable resistor connecting said amplifying means to said discriminating means and said supervisory response means is a solid state triggered switch means connected directly to the amplifying means.

Claim 12

The intrusion detection system of claim 8, wherein said transmitter means includes a solid state oscillator coupled to a coaxial cavity, a solid state direct current voltage regulator connected as the bias supply to said solid state oscillator and biasing said oscillator to generate said microwave field, said modulating mans including a solid state multivibrator circuit establishing an alternating current output voltage within said decreasing gain portion and having a variable resistor connected in the circuit of the multivibrator to vary the amplitude of the voltage and a variable capacitor connected in the circuit of the multivibrator to vary the frequency of the voltage, the multivibrator circuit being connected to said regulator and modulating the output of said regulator and the bias of said solid state oscillator to establish said modulation of the transmitted field.

Claim 13

An intrusion detection system comprising transmitter means having a solid state microwave oscillator and an antenna connected to said oscillator for radiating a microwave energy field into an area, receiver means mounted in said area for receiving said energy and detecting preselected Doppler frequencies related to selected motion of a target within said energy field, and a solid state supervisory oscillator means coupled to said microwave oscillator and modulating the transmitted field and establishing a supervisory signal having a frequency different than said preselected Doppler frequencies, and a supervisory response means connected to said receiver means to respond to said supervisory signal, said supervisory oscillator includes means connected in the circuit of the oscillator to adjust the frequency of the supervisory signal.

Claim 14

An intrusion detection system comprising transmitter means having a solid state microwave oscillator and an antenna connected to said oscillator for radiating a microwave energy field into an area, receiver means mounted in said area for receiving said energy and detecting preselected Doppler frequencies related to selected motion of a target within said energy field, and a solid state supervisory oscillator means coupled to said microwave oscillator and modulating the transmitted field and establishing a supervisory signal having a frequency different than said preselected Doppler frequencies, and a supervisory response means connected to said receiver means to respond to said supervisory signal, said supervisory oscillator includes means connected in the circuit of the oscillator to adjust the frequency of the supervisory signal.

Claim 15

An intrusion detection system comprising transmitter means having a solid state microwave oscillator and an antenna connected to said oscillator for radiating a microwave energy field into an area, receiver means mounted in said area for receiving said energy and detecting preselected Doppler frequencies related to selected motion of a target within said energy field, and a solid state supervisory oscillator means coupled to said microwave oscillator and modulating the transmitted field and establishing a supervisory signal having a frequency different than said preselected Doppler frequencies, said frequency of said supervisory signal and said Doppler frequencies both of the same order of magnitude, and a supervisory response means connected to said receiver means to respond to said supervisory signal, said supervisory oscillator includes means connected in the circuit if the oscillator to adjust the amplitude of the supervisory signal.

Claim 16

An intrusion detection system comprising transmitter means having a solid state microwave oscillator and an antenna connected to said oscillator for radiating a microwave energy field into an area, receiver means mounted in said area for receiving said energy and detecting preselected Doppler frequencies related to selected motion of a target within said energy field, and a solid state supervisory oscillator means coupled to said microwave oscillator and modulating the transmitted field and establishing a supervisory signal having a frequency different than said preselected Doppler frequencies, said frequency of said supervisory signal and said Doppler frequencies both of the same order of magnitude, and a supervisory response means connected to said receiver means to respond to said supervisory signal, said supervisory oscillator includes means connected in the circuit if the oscillator to adjust the amplitude of the supervisory signal.

Claim 17

An intrusion detection system comprising transmitter means having a solid state microwave oscillator and an antenna connected to said oscillator for radiating a microwave energy field into an area, receiver means mounted in said area for receiving said energy and detecting preselected Doppler frequEncies related to selected motion of a target within said energy field, and a solid state supervisory oscillator means coupled to said microwave oscillator and modulating the transmitted field and establishing a supervisory signal having a frequency different than said preselected Doppler frequencies, said frequency of said supervisory signal and said DOppler frequencies both of the same order of magnitude, an amplifying means connected to the output of the receiver means and having a selected gain characteristic including a relatively constant gain over the range of said preselected Doppler frequencies and a progressively decreasing gain portion with increasing frequencies and a supervisory response means connected to said amplifying to respond to said supervisory signal.

Claim 18

An intrusion detection system comprising transmitter means having a solid state microwave oscillator and an antenna connected to said oscillator for radiating a microwave energy field into an area, receiver means mounted in said area for receiving said energy and detecting preselected Doppler frequEncies related to selected motion of a target within said energy field, and a solid state supervisory oscillator means coupled to said microwave oscillator and modulating the transmitted field and establishing a supervisory signal having a frequency different than said preselected Doppler frequencies, said frequency of said supervisory signal and said DOppler frequencies both of the same order of magnitude, an amplifying means connected to the output of the receiver means and having a selected gain characteristic including a relatively constant gain over the range of said preselected Doppler frequencies and a progressively decreasing gain portion with increasing frequencies and a supervisory response means connected to said amplifying to respond to said supervisory signal.