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Perimeter Surveillance Radar
Perimeter surveillance radar (PSR) is a class of radar sensors that monitor activity surrounding or on critical infrastructure areas such as airports, seaports, military installations, national borders, refineries and other critical industry and the like. Such radars are characterized by their ability to detect movement at ground level of targets such as an individual walking or crawling towards a facility. Such radars typically have ranges of several hundred metres to over 10 kilometres. Alternate technologies include laser-based systems. These have the potential for very high target position accuracy, however they are less effective in the presence of fog and other obscurants. Characteristics PSR's usually have the following required characteristics: *No operator required: The radar autonomously detects movement in a defined area, tracks those targets and raises an alarm if the targets cross into alarm areas. *Export of target data: The radar not only has its own dedicated dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beamforming
Beamforming or spatial filtering is a signal processing technique used in sensor arrays for directional signal transmission or reception. This is achieved by combining elements in an antenna array in such a way that signals at particular angles experience constructive interference while others experience destructive interference. Beamforming can be used at both the transmitting and receiving ends in order to achieve spatial selectivity. The improvement compared with omnidirectional reception/transmission is known as the directivity of the array. Beamforming can be used for radio or sound waves. It has found numerous applications in radar, sonar, seismology, wireless communications, radio astronomy, acoustics and biomedicine. Adaptive beamforming is used to detect and estimate the signal of interest at the output of a sensor array by means of optimal (e.g. least-squares) spatial filtering and interference rejection. Techniques To change the directionality of the array when transm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clutter (radar)
Clutter is a term used for unwanted echoes in electronic systems, particularly in reference to radars. Such echoes are typically returned from ground, sea, rain, animals/insects, chaff and atmospheric turbulences, and can cause serious performance issues with radar systems. Backscatter coefficient What one person considers to be clutter, another may consider to be a target. However, targets usually refer to point scatterers and clutter to extended scatterers (covering many range, angle, and Doppler cells). The clutter may fill a volume (such as rain) or be confined to a surface (like land). In principle, all that is required to estimate the radar return (backscatter) from a region of clutter is a knowledge of the volume or surface illuminated and the echo per unit volume, η, or per unit surface area, σ° (the backscatter coefficient). Clutter-limited or noise-limited radar In addition to any possible clutter there will also always be noise. The total signal competing with t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doppler Radar
A Doppler radar is a specialized radar that uses the Doppler effect to produce velocity data about objects at a distance. It does this by bouncing a microwave signal off a desired target and analyzing how the object's motion has altered the frequency of the returned signal. This variation gives direct and highly accurate measurements of the radial component of a target's velocity relative to the radar. Concept Doppler effect The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the difference between the observed frequency and the emitted frequency of a wave for an observer moving relative to the source of the waves. It is commonly heard when a vehicle sounding a siren approaches, passes and recedes from an observer. The received frequency is higher (compared to the emitted frequency) during the approach, it is identical at the instant of passing by, and it is lower during the recession. This variation of f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Video Content Analysis
Video content analysis or video content analytics (VCA), also known as video analysis or video analytics (VA), is the capability of automatically analyzing video to detect and determine temporal and spatial events. This technical capability is used in a wide range of domains including entertainment,KINECT , add-on peripheral for the console and video browsing, health-care, retail, automotive, transport, home automation< ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Man Portable Radar
Man-portable radar is a lightweight surveillance radar system that does not require vehicle support to transport or operate. Man-portable radar was developed to introduce radar to remote areas where vehicle support is not feasible. Examples PPE PGSR-3i ‘Beagle’ 'PPE PGSR-3i ‘Beagle’'' is a unique lightweight man-portable radar by 'Pro Patria Electronics'', which is capable of intercepting, detecting and tracking targets moving on or close to the ground. It can also classify and differentiate targets based on their size and movement characteristics. PPE PGSR-3i ‘Beagle’ can operate on standard Bren Tronics military batteries as well as from a vehicle or mains power source. PPE PGSR-3i ‘Beagle’ can scan from 11 to 360 degrees with a continuous 360 degree scanning. PPE PGSR-3i ‘Beagle’ has automatic and manual doppler audio mode, artillery correction mode, continuous 360 degree scanning mode. Has detection ranges of 40 km for very large vehicles 25 km for vehi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elta Systems
ELTA Systems Ltd (ELTA) is an Israeli provider of defense products and services specializing in radar, ELINT, COMINT, C4ISTAR, Electronic Warfare, Communication, Autonomous Ground Systems, Intelligence and Cyber products. ELTA, a group and subsidiary of Israel Aerospace Industries, is one of Israel's major defence electronics companies specializing in a variety of fields. The company was established in 1967 and moved to Ashdod as part of Levi Eshkol's policy of industry decentralization. The group operates as a designer and manufacture of defense systems house with products based on electromagnetic sensors (radar, electronic warfare and communication) and on other advanced technologies. ELTA products are designed for use in Intelligence, surveillance, target acquisition, and reconnaissance (ISTAR), early warning & control, homeland security (HLS), self-protection and self-defense, fire control and Cyber Defense . ELTA operates a worldwide marketing network, which includes cu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FLIR Systems
Teledyne FLIR LLC (an acronym for "forward-looking infrared"), a subsidiary of Teledyne Technologies, specializes in the design and production of thermal imaging cameras and sensors. Its main customers are governments and in 2020, approximately 31% of its revenues were from the federal government of the United States and its agencies. Operations FLIR produces devices for the following markets: * Surveillance and reconnaissance * Force protection * Border and maritime patrol * Critical infrastructure protection * Search and rescue * Detection * Targeting * Airborne law enforcement * Drug interdiction Facilities The company has offices, manufacturing, and/or research and development facilities in Nashua, New Hampshire; Goleta, California; North Billerica, Massachusetts; Orlando, Florida; Bozeman, Montana; Stillwater, Oklahoma; Arlington County, Virginia; Chelmsford, Massachusetts; Ventura, California; Elkridge, Maryland; Freeport, Pennsylvania; Oak Ridge, Tennessee; Waterloo, Onta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compact Surveillance Radar
Compact surveillance radar are small lightweight radar systems that have a wide coverage area and are able to track people and vehicles in range and azimuth angle. They weigh less than 10 pounds, consume less than 15 Watts of power and are easily deployed in large numbers. Compact surveillance radar have the same characteristics of the larger Ground Surveillance Radar Ground may refer to: Geology * Land, the surface of the Earth not covered by water * Soil, a mixture of clay, sand and organic matter present on the surface of the Earth Electricity * Ground (electricity), the reference point in an electrical c ... (GSR) namely; the ability to track many moving targets simultaneously, all weather day & night operation, wide coverage areas and the ability to track targets and cue cameras automatically. References Radar {{Technology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radar
Radar is a detection system that uses radio waves to determine the distance (''ranging''), angle, and radial velocity of objects relative to the site. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the objects. Radio waves (pulsed or continuous) from the transmitter reflect off the objects and return to the receiver, giving information about the objects' locations and speeds. Radar was developed secretly for military use by several countries in the period before and during World War II. A key development was the cavity magnetron in the United Kingdom, which allowed the creation of relatively small systems with sub-meter resolution. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surveillance
Surveillance is the monitoring of behavior, many activities, or information for the purpose of information gathering, influencing, managing or directing. This can include observation from a distance by means of electronic equipment, such as closed-circuit television (CCTV), or interception of electronically transmitted information like Internet traffic. It can also include simple technical methods, such as Human intelligence (intelligence gathering), human intelligence gathering and postal interception. Surveillance is used by citizens for protecting their neighborhoods. And by governments for intelligence gathering - including espionage, prevention of crime, the protection of a process, person, group or object, or the investigation of crime. It is also used by criminal organizations to plan and commit crimes, and by businesses to Industrial espionage, gather intelligence on criminals, their competitors, suppliers or customers. Religious organisations charged with detecting he ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
