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Unattended Ground Surveillance Sensor Systems

The first sensor is a Seismic Sensor. This sensor is buried underground and detects the movement of either human beings or vehicles. This is possible through the analysis of seismic activity at the sensor site. The seismic sensor detects all seismic activity and sends this information to the processor which distinguishes between human and vehicular traffic. All other seismic activity is discarded.

The second sensor is a Magnetic Sensor. This sensor is also buried underground, usually near a roadway leading to a location where monitoring is required. As vehicles travel past the magnetic sensor, the sensor detects the direction of travel and sends that information to the processor. This sensor will provide the direction of travel of vehicles or ATVs, regardless of the direction of the vehicle.

The third sensor is an Infrared Sensor that is mounted above ground to detect the movement of a thermal target. This sensor is effective at ranges of up 80 feet for human detection and 200 feet for vehicle traffic. As the name implies, this sensor is looking for infrared activity within its field of view. This sensor also has the ability to determine the direction of travel of a subject or vehicle. Typical applications are along pathways or in areas that the suspect has traveled in the past.

Multiple sensor applications:

In some system applications, you may wish to utilize multiple sensors at one site. This application is useful when you have a situation or location where redundant sensing will help to ensure accurate target detection. All systems have this multiple sensor capability. System configuration and production are use selectable. In other words, we will custom build the system package you need, not a system that is forced to fit your application.

LCT-XX Transmitter

(Low Current Transmitter) is a sophisticated processor and transceiver housed in a compact rugged case which facilitates storage, transportation, and concealment. This unit is ideal for long term deployment from 3 months to one year or longer depending on configuration. Constructed of injection-molded plastic, the watertight and corrosion-proof case may be deployed either above ground or buried for security and stealth; only the antenna needs to be above ground for proper operation.

Selectable sensitivity setting and alarm number for each input

Configurable with four types of sensor

A single unit receives, processes, and transmits information generated by contact closure/open, seismic, infrared, or magnetic sensor(s) either individually or in various combinations of deployment, giving the system maximum flexibility. The LCT-XX utilizes four types of sensor cards: Directional/Seismic (DS), Dual Directional (DD), Dual Seismic (SS) and Contact Closure/Open (CC).

All control switches are set using decimal format rotary switches. The switches are clearly labeled and easily read: address, channel select, self-test time, and alarm repeat. Each sensor input has individual sensitivity gain setting and alarm number (port) selectable by the user. The LCT-XX operates either in classify or detect mode.

The LCT-XX is designed to operate using a 12Vdc power source: (2x) 6Vdc lantern or rechargeable batteries, or a single 12Vdc rechargeable battery. Power supply options depend on environmental conditions and the length of time the unit is to be deployed. Solar-powered or commercial power sources may also be used.

Transmitters are also called processor/transmitters because this is the point in the detection chain where the intrusion that is detected by the sensors is interpreted and processed into information that you can act upon. As the intrusion information is received, the processor/transmitter looks for usable information such as human footsteps, and confirms that seismic signature as one which requires additional action. After confirmation of the intrusion signature, the transmitter transmits the intrusion alarm to its next destination, such as a Remote Relay, cell tower or handheld receiver.

In short, there are two types of transmitters; long term and short term deployment models. In the long term there are two additional models to choose from.

What Is Long Term?

As it relates to Remote Intrusion Detection, long term is any deployment where you install sensors and transmitters for longer than six (6) months. Long term transmitters such as the LCT have the ability to be deployed for over a year without additional service or batteries.

A seismic sensor is a passive intrusion detector that responds to seismic stimuli created by either vehicles or persons within the area under surveillance. The processor accepts the signals sent by the seismic detectors, determines the magnitude of activity, establishes whether the intrusion is a pedestrian or vehicle, and transmits the appropriate alarm.

The seismic activity is monitored in conjunction with an Automatic Gain Control (AGC) circuit to reduce the effects of background noise (natural seismic occurrences). A buried seismic sensor detects seismic activity at the detector location and generates an electrical signal that is analyzed by the micro-controller to determine if a specified type of intrusion has occurred.

A single seismic detector is used to monitor a small area or trail, or several detectors can be combined in a string to monitor large open areas or perimeters. Detection range will depend on several variables such as type of terrain, sensitivity setting, number of sensors, and type of intruders.

A seismic sensing pattern is circular in a horizontal plane. The sensing pattern for a seismic string depends on the number and spacing of the seismic probes used. Up to ten seismic probes in a string may be used with a single processor in seismically quiet locations. This arrangement can provide a considerable economic advantage when used on extended boundaries and perimeters.

The Seismic Sensor and Seismic Line String operate satisfactorily in a variety of soil types, environmental conditions, and intrusion profiles. Nonetheless, specific site selection may be an important factor in providing a reliable input signal. The following guidelines may be helpful in site selection:

Detection of Pedestrians Select areas where the walking surface is firm or hard and relatively dry. When possible, avoid loose sand, swampy areas, or areas that are springy from roots or heavy surface vegetation. Choose a location where the walking is likely to be continuous, not start-stop or extremely cautious. Avoid staging areas or extremely rough terrain. Seismic sensors are designed to detect the human cadence (between 1 Hz and 3 Hz), not the higher cadence of four-legged animals.

Detection of Vehicles Select areas where the surface of the expected vehicle path is reasonably smooth and uniform. Select a location where the vehicle path is essentially a straight line and constant speeds are probable. Avoid sharp turns, steep grades, or extremely rough terrain. GROUND SCOUT circuitry filters high-frequency vibrations to sense vehicles and generates an alarm. Through the use of automatic gain control (AGC), false alarms are reduced.

Nuisance and false alarm probability may be minimized by:

a. Operation at minimum acceptable sensitivity.

b. Location of the detector in areas least favorable to casual intrusions.

c. Deeper implantation and some ground cover in the vicinity of the detector.

Avoidance of areas where periodic or intermittent seismic activity is generated. For example, the vicinity of motors, pumps, pipelines, railroads, the base of wind-loaded structures, or areas of high geothermal and earth tremor activity.

Magnetic Sensor

A magnetic sensor is a passive intrusion detector that responds to magnetic stimuli created by the movement of ferrous metal within its range. Stationary iron or steel objects within sensing range are not sensed and do not affect the sensor's ability to detect movement within the surveillance area. The magnetic detector determines direction of travel.

The magnetic sensor detects extremely small changes in the earth's magnetic field caused by movement of ferromagnetic materials near the magnetometer probes. The incoming signal is processed by both frequency and time-domain circuits. Frequency and time criteria used in the circuits are derived from field-testing and have proven to be highly effective.

Care should be exercised in the deployment of the magnetic sensor to assure optimum performance. The range of vehicle speeds detectable by the sensor is from 5 to 70 miles per hour. The distance of the sensor from the road is variable up to 35 feet. After the magnetic sensor is aligned, it must be rigidly fixed. The ideal site for installation of the magnetic sensor is a relatively straight vehicle track with a reasonably smooth and uniform surface, where vehicle speed is likely to be constant past the detector. Avoid sharp turns, steep grades, and extremely rough terrain.

The sensor does not require a line-of-sight environment for operation; hence, it can be concealed underground, installed at ground level behind walls, moored underwater, or mounted above ground. In underground installations, the sensor is secured by the soil covering it. In surface or above-surface installations, secure the sensor with sandbags or other heavy non-metallic objects.

The sensor detects changes in magnetic field level; therefore, any large metallic objects moving close to the sensor may set off a nuisance alarm. If the sensor must be deployed near a large mass of metal, the mass must be stationary. The larger the mass of metal, the longer the range within which the sensor will respond to the mass. It is suggested that the sensor be kept at least 100 feet from large moving metal objects.


Passive Infrared Sensor (PIRS)

The Passive Infrared Sensor (PIRS) is an intrusion detector that produces a standard output pulse in response to infrared energy radiated by pedestrians or vehicles within its field of view. Depending on the temperature difference between the subject and the background, useful range of detection for a short-range sensor is upwards of 80 feet for pedestrians and 200 feet for vehicles. It produces a signal when it senses the movement of heat sources. The unit is utilized for remote detection of vehicles and people.

Several models are available with various detection ranges and capabilities. The PIRS is telescopic in design for either indoor or outdoor application and housed in a rugged all-weather, water-resistant PVC case. Easily deployed and concealed, it is ideal for monitoring isolated roads and trails. The PIRS is used with either a one (1) or two (2) thermopile head assembly.

The sensor includes circuitry that cancels noise spikes and automatically adjusts the alarm threshold according to the amount of background noise present (adaptive threshold). Mounting and positioning the thermopile head requires care and proper alignment. Infrared detection will prove superior to other types of sensors when it is necessary to have low false alarm rates and highly directional coverage. A two (2) thermopile head assembly determines the direction of travel of the intruder.

The ideal installation of the PIRS is a firm post or pole for mounting the thermopile head assembly. For successful operation, the site must:

a. have an unobstructed line-of-sight from the head to the subject (not through a window or reflected from a mirror).

b. be as far as possible from background objects that might move, such as leaves, highway traffic or farm animals.

c. not point directly at the path of the sun (or at its specula reflection).

There are multiple receiver types that can be used for monitoring an area:

1. Base Station Model: The base station is the primary receiver system of the Mule series. The base station has the capability of receiver multiple alarm information on different frequencies. The system is configured to work with a software operating system for observing multiple sensor systems

2. Mobile System: The mobile system and display allows for observing alarm information in a vehicle mount configuration or used in the field as a handheld unit. The mobile system also has the capability of working with the Monitron software operating system.

3. Handheld System: For the operator in the field, there is also a handheld version that is ruggedized and has an optional belt or harness attachment for easy carrying.

The seismic sensor is a passive intrusion detector that responds to seismic stimuli created by either vehicle or persons within the area under surveillance. The processor/transmitter accepts the signal input from the seismic sensor and can determine the type of intrusion as either vehicle or pedestrian. The Monitron seismic sensor has a connector at the end of each array that allows for multiple seismic sensors to be attached creating a larger area of detection.

The seismic sensing pattern is circular in a horizontal plane. The sensing pattern for a seismic string depends on the number and spacing of the seismic probes. Up to twelve seismic sensor systems can be used with each processor/transmitter.

The M C Border Security Inc. magnetic sensor is a passive intrusion detector that responds to magnetic stimuli created by the movement of ferrous metal within its range. Stationary iron or steel objects within the sensing range are not detected and do not affect the sensorís ability to detect movement within the surveillance area. The M C Border Security Inc. magnetic sensor system has the capability of determining direction of travel.

The Passive Infrared Sensor is an intrusion detector that produces a standard output pulse in response to infrared energy radiated by vehicle and pedestrian traffic within its field of view. Several models are available with various detection ranges and capabilities. The Infrared sensor system is telescopic in design for either indoor or outdoor application and housed in a rugged all-weather, water-resistant PVC case. Easily deployed and concealed, it is ideal for monitoring isolated areas.

The M C Border Security Inc. Relay/Repeater functions as a remote switch that is activated when a specific addresses and alarms are decoded. Two set of contact points (N/O & N/C) are programmed via the keypad. The Relay/Repeater can store up to fifty specific addresses and relay activation times can be operator programming. The repeater function can be used to extend the range of the transmitter processors. The Relay/repeater system works with all series systems offered by M C Border Security Inc.

We also carry a full line of video and thermal imagery as well as secure video transmission devices.

For related links see:

http://monitronllc.com , http://bockoptronics.ca , www.msensor.com ,†http://www.groundscout.com †, http://lxsix.com , http://qual-tron.comhttp://intelli-scope.com http://telocate.com www.deepdevelopmentcorp.com www.focaltrack.com www.reconyx.com

or call (506) 450-2800

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