Abstract: In at least one embodiment the present invention relates to a Multiple Input Multiple Output (MIMO) covert terrain following outdoor perimeter security sensor that can detect, locate and categorize intruders as they move in proximity to buried sensor cables. This MIMO cable guided radar utilizes parallel standard leaky coaxial cables with uniform aperture(s) in the outer conductor. RF transmissions from both ends of one cable setup an invisible electromagnetic detection field which couples into parallel receive cables. When an intruder moves within the coupled electromagnetic fields the amplitude and phase of the multiple received signals are altered. Signals received from both ends of each receive cable are processed jointly to detect and locate intruders along the length of the sensor cables. The joint processing of the responses seen from both ends of the cable(s), referred to as End-to-End correlation provides uniform sensitivity along the length of cables without the need for expensive “graded” cables.

Abstract: In at least one embodiment the present invention relates to a Multiple Input Multiple Output (MIMO) covert terrain following outdoor perimeter security sensor that can detect, locate and categorize intruders as they move in proximity to buried sensor cables. This MIMO cable guided radar utilizes parallel standard leaky coaxial cables with uniform aperture(s) in the outer conductor. RF transmissions from both ends of one cable setup an invisible electromagnetic detection field which couples into parallel receive cables. When an intruder moves within the coupled electromagnetic fields the amplitude and phase of the multiple received signals are altered. Signals received from both ends of each receive cable are processed jointly to detect and locate intruders along the length of the sensor cables. The joint processing of the responses seen from both ends of the cable(s), referred to as End-to-End correlation provides uniform sensitivity along the length of cables without the need for expensive “graded” cables.

Abstract: The present invention provides an intrusion detecting system and method for precisely locating an intruder along the length of a sensor cable and for determining the intruder distance from the cable to precisely locate multiple, simultaneously occurring intrusions. The method includes the steps of: generating a TX signal and transmitting same over a first transmission line of the sensor cable, for creating an electromagnetic field; detecting an RX signal induced in a second transmission line of the cable by the electromagnetic field and identifying in the RX signal a contra-directional reflection received from a target and a co-directional reflection received from the far-end of the first transmission line, processing the contra-directional reflection for providing a first coordinate of the target, and processing the co-directional reflection for providing a second coordinate of the target.

Abstract: The present invention provides an inexpensive security sensor cable, a method for manufacturing of same and an overall security system for using that sensor cable. The sensor cable consists of a central conductor, an air separator, a polyethylene dielectric tube, an outer conductor and an outer protective jacket. The central conductor is loosely centered in the coaxial cable and thus freely movable relative to the dielectric tube. The sensor cable has application either in a passive sensing system or in an active ranging sensing system to determine the location of an intrusion along the cable. For the passive sensing function, when the center conductor moves, it contacts a suitable dielectric material from the triboelectric series, such as polyethylene, which can be processed to produce a charge transfer by triboelectric effect that is measurable as a terminal voltage.

Abstract: The present invention provides an intrusion detecting system and method for precisely locating an intruder along the length of a sensor cable and for determining the intruder distance from the cable to precisely locate multiple, simultaneously occurring intrusions. The method includes the steps of: generating a TX signal and transmitting same over a first transmission line of the sensor cable, for creating an electromagnetic field; detecting an RX signal induced in a second transmission line of the cable by the electromagnetic field and identifying in the RX signal a contra-directional reflection received from a target and a co-directional reflection received from the far-end of the first transmission line, processing the contra-directional reflection for providing a first coordinate of the target, and processing the co-directional reflection for providing a second coordinate of the target.

Abstract: The present invention provides an inexpensive security sensor cable, a method for manufacturing of same and an overall security system for using that sensor cable. The sensor cable consists of a central conductor, an air separator, a polyethylene dielectric tube, an outer conductor and an outer protective jacket. The central conductor is loosely centered in the coaxial cable and thus freely movable relative to the dielectric tube. The sensor cable has application either in a passive sensing system or in an active ranging sensing system to determine the location of an intrusion along the cable. For the passive sensing function, when the center conductor moves, it contacts a suitable dielectric material from the triboelectric series, such as polyethylene, which can be processed to produce a charge transfer by triboelectric effect that is measurable as a terminal voltage.

Abstract: An outdoor microwave transceiver intrusion detector that alternately transmits pulses of RF energy at two different frequencies and uses range and direction of travel information derived from the phase of the two Doppler responses to optimize the signal processing and apply range dependent thresholds. The time delay between the onset of the transmitted pulse and the sample of the Doppler response is controlled to provide an accurate range cutoff. The two frequencies are selected so that the difference in phase of the Doppler response at the two frequencies increases from zero to ninety degrees as the target goes from the Transceiver to the maximum range. Digital signal processing is used to measure the difference in phase of the two Doppler responses and translate this information into location of the target. The location information is used to create a number of range bins.

Abstract: A FM CW cable guided radar for the detection and location of outdoor perimeter intruders. Helically wound outer conductors on coaxial transmit and receive transmission lines provide a slow wave structure to support the propagation of external electromagnetic fields. The two leaky coaxial lines are enclosed in an extruded plastic jacket with the outer conductors in continuous electrical contact along the length of the cable. A chirp frequency modulation provides a continuous target response having a baseband frequency that is proportional to the distance along the length of the cable. After location determination, the amplitude of the response is compared to a location specific threshold to determine if an intruder is present.

Abstract: An outdoor microwave transceiver intrusion detector that alternately transmits pulses of RF energy at two different frequencies and uses range and direction of travel information derived from the phase of the two Doppler responses to optimize the signal processing and apply range dependent thresholds. The time delay between the onset of the transmitted pulse and the sample of the Doppler response is controlled to provide an accurate range cutoff. The two frequencies are selected so that the difference in phase of the Doppler response at the two frequencies increases from zero to ninety degrees as the target goes from the Transceiver to the maximum range. Digital signal processing is used to measure the difference in phase of the two Doppler responses and translate this information into location of the target. The location information is used to create a number of range bins.

Abstract: A FM CW cable guided radar for the detection and location of outdoor perimeter intruders. Helically wound outer conductors on coaxial transmit and receive transmission lines provide a slow wave structure to support the propagation of external electromagnetic fields. The two leaky coaxial lines are enclosed in an extruded plastic jacket with the outer conductors in continuous electrical contact along the length of the cable. A chirp frequency modulation provides a continuous target response having a baseband frequency that is proportional to the distance along the length of the cable. After location determination, the amplitude of the response is compared to a location specific threshold to determine if an intruder is present.

Abstract: A location and ranging system using a pair of leaky coaxial cables to detect targets along a prescribed route. When used as a security surveillance system an intruder is treated as the target and the prescribed cable routing is the perimeter of the protected area. The cables are mounted parallel to each other with a separation sufficient so as to cause the two cables to be loosely coupled. A transmitter is connected to one of the cables to supply pulses of RF energy for propagation therealong. The presence of a target (any body which reflects or absorbs radio frequency energy) alters the magnitude and phase of the signal received at the other cable and, hence, provides a change in the return signal to a receiver connected to the other cable. This change in signal is processed digitally to discriminate between legitimate targets and very slow environmental changes and very high speed changes due to undesirable targets such as birds.