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US 6,208,248 B1Granted
Quick response perimeter intrusion detection sensor
AssigneeAnro Engineering, Inc.
InventorGerald F. Ross
Life of this patent
Estimating the term…
Abstract
An Ultra Wideband (UWB) short-range radar system is used for the detection of targets in clutter. Examples of targets on the ground include human walkers, crawlers and runners, and vehicles. The UWB sensor can also be used to detect small approaching boats in different levels of sea clutter or airborne targets like hang gliders. One of the primary differences between this device and other UWB radar sensors is the manner in which the bias on the threshold detector is set as well as the logic circuitry used to find targets in clutter while maintaining a low false alarm rate. The processing is designed to detect targets in varying degrees of clutter automatically. There may be no front panel controls other than an ON-OFF switch. The system is lightweight, low-cost, and can be easily installed in minutes.
Claims14
An Ultra Wideband (UWB) short range covert sensor for detection of an intruder in a cluttered environment, comprising:
- a transmitting dipole element cut to be half wave resonant at a predetermined frequency and fed by a wideband balun to produce a radiated signal which is noise-like in appearance to search said cluttered environment looking for said intruder;
- a UWB Marx generator for generating a baseband pulse to excite said wideband balun;
- a system clock to set the pulse repetition frequency (PRF) of said sensor to a lowest value to detect a fastest expected target traveling radially towards said sensor, said system clock including a random number generator for randomizing pulses being sent to said generator, said system clock further generating a pulse train sequence and a clock pulse sequence;
- a range gate controller responsive to said pulse train sequence and said clock pulse sequence for generating a sequential range gate signal of a predetermined duration;
- a receiving dipole element for receiving a reflected signal from said cluttered environment and generating a plurality of signals indicating an amount of noise and clutter;
- a register for storing bits representative of said plurality of signals and generating an output signal if there is an increase or decrease in said bits by more than a predetermined amount;
- a signal processor responsive to said output signal and said range gate signal to generate an alarm signal indicating the presence of said intruder;
- an alarm which is activated by receiving said alarm signal and may be reset either manually or remotely.
5 more elements
A method of using an Ultra-Wideband (UWB) short range sensor for a detection of an intruder in a cluttered environment, including the steps of:
- A. Setting a range gate of said sensor of a predetermined width to scan a cluttered area at a distance A from said sensor for a predetermined time interval,
- B. Switching said range gate to scan said cluttered area at a distance A′ from said sensor for if no intruder is detected where said distance A is greater than said distance A′,
- C. Alternately switching said range gate between said distance A and said distance A′ after said predetermined time interval,
- D. Detecting a potential intruder at said distance A or said distance A′,
- E. Reducing said range gate to a distance B wherein said distance B is less by a predetermined distance from said distance A if said intruder was detected at said distance A, and said distance B is less by said predetermined distance from said distance A′ if said intruder was detected at said distance A′,
- F. Detecting said intruder at said distance B within a prescribed time period,
- G. Reducing said range gate to a distance C wherein said distance C is less by said predetermined distance from said distance B,
- H. Detecting said intruder at said distance C within said prescribed time period,
- I. Triggering an alarm,
- J. Returning to step A if no intruder is detected at said range set at said distance B or said distance C within said prescribed time period.
7 more elements
An Ultra-Wideband (UWB) short-range covert sensor for a detection of an intruder in a cluttered environment, comprising:
- a network for sending a sequence of noise-like range gate signals to said cluttered environment;
- a receiver for receiving a first sequence of reflected signals from said cluttered environment from a first band at a first predetermined distance from said sensor for detecting said intruder who is upright, and alternatively from a second band at a second predetermined distance from said sensor for detecting said intruder who is crawling, said second band being closer to said sensor than said first band;
- a processor for analyzing said first sequence of reflected signals and generating a first detection signal having a first value if said intruder is detected within said first or said second band;
- said receiver being responsive to said first detection signal having said first value for receiving a second sequence of reflected signals from a third band, said third band being closer to said sensor than the corresponding said first or said second band;
- said processor further analyzing said second sequence of reflected signals and generating a second detection signal having a first value if said intruder is detected within said third band;
- said receiver being further responsive to said second detection signal in said first state for receiving a third sequence of reflected signals from a fourth band, said fourth band being closer to said sensor from said third band;
- said processor further analyzing said third sequence of reflected signals and generating an alarm signal if said intruder is detected within said fourth band;
- said receiver receiving said first sequence of reflected signals if said processor generates said first or said second detection signals having a second value indicating a false detection of said intruder.
5 more elements
An Ultra-Wideband (UWB) short-range covert sensor for a detection of a glider approaching said sensor comprising:
- a network for sending a sequence of noise-like range gate signals to an area in which said glider will approach;
- a receiver for receiving a first sequence of reflected signals from said first band at a predetermined distance from said sensor for detecting said glider;
- a processor for analyzing said first sequence of reflected signals and generating a first detection signal having a first value if said glider is detected within said first band;
- said receiver being responsive to said first detection signal having said first value for receiving a second sequence of reflected signals from a second band, said second band being closer to said sensor than said first band;
- said processor further analyzing said second sequence of reflected signals and generating a second detection signal having a first value if said intruder is detected within said second band;
- said receiver being further responsive to said second detection signal having said first value for receiving a third sequence of reflected signals from a third band, said third band being closer to said sensor than the corresponding said first or said second band;
- said processor further analyzing said third sequence of reflected signals and generating an alarm signal if said intruder is detected within said third band.
4 more elements
Dependencies are inferred from the claim text.