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Antenna Control Unit COFDM stands for Coded Orthogonal Frequency Division Multiplexing. Typically the incoming video signal is first compressed, then modulated using inverse Fast Fourier transforms and shared between 1704 transmitted carriers. Several levels of error protect are included and transmission parameters can be optimized for robust use. COFDM transmission is a multi-carrier digital transmission technique that thrives in high multi-path environments. The increased performance of the COFDM system is both in the terms of link continuity and picture quality because the receiver is able to utilize reflected and direct signals. ECS have developed a COFDM Antenna Control Unit (ACU) to control the Active Switch Sector Base Station Antenna which interfaces with the VLR 15-16-1D series of COFDM base stations.
As an option this antenna control unit maybe fitted with a GPS receiver for use in mobile or temporary applications. The range has the ability to control either 5 or 6 antennas. The 2.3 and 3.5GHz variants control 5 sector antennas whereas the 4.5GHz version has a 6 sector antenna. Video Link Rack Receiver The Video Link Rack Receiver is designed for use as a base station or mobile receiver. It may be used with the switched sector antenna system or with omnidirectional antennas. The 3.5 and 4.5GHz versions have filtering and frequency down conversion to the first intermediate frequency near the antenna. The receiver will automatically select the matching code rate, guard interval and demodulation scheme for any given input signal.
Decryption can be provided within the system if required and is fully automatic. Two video channels can be received and decoded simultaneously. The LCD display provides an indication of signal strength, channel selected and encryption code authorised. Outputs are provided in RGB, Y/C, NTSC and MPEG. An ASI output is also available on request. Base Station Receiving Equipment The ECS COFDM Digital Base Station Receiver is designed to use as a base system or mobile receiver. It can be used with either the ECS switched sector antenna system or omni directional antennas. Not only does it automatically select matching code rate, guard interval and demodulation scheme for any given input signal, the Base Station Receiver is also available with fully automatic decryption upon request. Coded Orthogonal Frequency Division Multiplexing (COFDM) is a state of the art transmission technique utilizing multiple carriers to provide high quality real time video images in environments and situations where conventional video links would fail through multipath interference.
The system consists of: The COFDM Antenna Control Unit The COFDM Active Switch Sector Antenna The COFDM Digital Base Station Receiver with dual channel video. These three parts make up a complete COFDM base station able to receive air to ground video transmission from 45-50n miles @200ft. GPS information is utilized to control the base station switch sectored antenna. Features
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Video Link Briefcase Receiver The digital briefcase receiver has been specifically designed for mobile reception of COFDM digital video transmission from either aircraft or ground based transmitters. Installed is high brightness detachable 10.4'' LCD colour monitor with the facility to daisy chain into other larger monitors as required. Both the dual and single video channel versions are available. The Briefcase can be produced in a variety of GHz bands.
Features
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Digital Video Aircraft Downlink The Digital Aircraft Downlink is optimized for air to ground use and is extremely resistant to multi-path interference. It is designed to comply with Home Office MG42C, DVB-T and MPEG specifications. The Digital Aircraft Downlink is available for the 2.4, 3.45 and 4.5GHz bands. The Digital Video Aircraft Downlink is designed to comply with Home Office MG42C, DVB-T and MPEG2 specifications. The U.K. Police Force Helicopters Divisions use the Downlink system, which has enabled them to obtain outstanding results. They have even commented that the picture quality is exceptional and one of the best they have ever used. These successes have also lead to significant Military installations, with equally successful results.
The Digital Video Aircraft Downlink system can be installed in both Helicopter and Fixed Wing Aircraft giving both the Police Forces and the Military a huge range of operational options. Features
Tech Video Codec and Modulator Box
Transmitter
Antenna
Encryption Control Unit
Downlink Encryption Control Unit The Downlink Encryption Control Unit has been designed to fit within the Digital Video Aircraft Downlink package of products. The three soft keys enable the users to easily select and control the key functions, Transmitter on/off and mute, the encryption code and Transmit mode.
The system allows the airborne user to set the destination encryption code which defines which ground user will be able to decode the COFDM transmission. Features
Tech
1.4GHz & 2.3GHz Downlink Transmitter The VLT 15-10-6-D1.4 operates at 1.4GHz and is one element of the Digital Video Aircraft Downlink package. It is a linear amplifier which takes in a low power of 10 watts to feed into the microwave antenna. This amplifier has been designed for helicopter use and the United Kingdom Police Forces who have installed the complete Downlink package have commented on the efficiency of this amplifier, both for its low power use and the ease of using the remote cable control facility.
The VLT 15-10-6-D2.3 operates at 2.3GHz and is one element of the Digital Video Aircraft Downlink package. It is a linear amplifier which takes in a low power of 10 watts to feed into the microwave antenna. This amplifier has been designed for helicopter use and the Military have commented on the efficiency of this amplifier, both for its low power use and the ease of using the remote cable control facility. Bi-Directional Fixed Link The Guardsman 'M' & 'M2' are fully military specification COFDM back bone links utilizing ECS unique accredited CESG approved AES encryption. The 'M' version has full duplex video as well as single channel audio and date. Utilizing 16QAM modulation the 'M' & 'M2' equipment have an air data rates of 18Mbps.
Video picture quality is to DVD standards and the equipment consists of mast head mounted diplexer, up/down converter and optional power amplifier with equipment room encoder and decoder units at each end of the link. All Guardsman equipment is dry nitrogen back filled for better environmental performance. Diversity Receiver Module Designed specifically for mobile reception and vehicle use, this latest ECS COFDM receiver uses two antennas and diversity reception to offer a 6-8dB receiver margin improvement over single channel receivers. A sophisticated channel state indictor system provides an accurate measurement of received signal to noise performance, selecting the best available information from the dual antenna inputs in real time on a carrier by carrier basis. The ECS COFDM digital receiver can be used with a wide variety of covert and overt antennas. Individual low noise frequency down converts are provided for each antenna. This equipment is provided in three parts, two modular down converters, a receiver with an IF input and a control panel that provides receiver and signal status.
When used with either the ECS 1 watt or 10 watt COFDM transmitters the resultant encrypted video link is extremely robust and ideal for surveillance in built up areas. Mobile applications include:- a) Vehicle to Vehicle b) Person to Vehicle c) Uplink to Aircraft and rebroadcast from either person or vehicle. Features
Tech Down Converter (2 required for DIV operation)
Receiver
Connectors
Mini Surveillance Transmitter The ECS COFDM transmitter is a miniature, rugged, 1 watt unit designed to be easily deployed and used for street surveillance in metropolitan areas. It is also extremely effective in transmitting real time video images from within buildings to ECS portable receiving equipment within a vehicle. The ECS mini COFDM transmitter utilizes a separate hand held programmer enabling comprehensive control and programming if required, but reducing the operator controls to a simple on/off switch. Features
Tech
Module Receiver (picture currently unavailable) The ECS COFDM modular receiver has been specifically designed for reception of digital video transmission from either aircraft or ground based transmitters and comprises a modular receiver; a single block down converter and a hand held controller unit. The receiver will automatically select the matching code rate and demodulation scheme for any given input signal. Decryption is based upon 'Destinations' and is fully automatic. This digital receiver can be used with a wide variety of covert and overt antennas. When used with either the ECS 1 watt or 10 watt COFDM transmitters the resultant encrypted video link is extremely robust and ideal for surveillance in built up areas. Mobile applications include: * Vehicle to Vehicle * Person to Vehicle *Uplink to aircraft and rebroadcast from either person or vehicle Mini Transmitter Module The Sentry is a fourth generation COFDM transmitter with integrated AES encryption
. The standard unit operates on a single RF channel, multi channel versions are also available with channel selection via an operational hand held controller or software running on a PC. 1.4GHz Transmit & Receive Modules (picture currently unavailable) The VLT/R16 series is an entry level COFDM link with many features of its military relatives. Designed for professional security users such as Local Authorities and Police TSU's, it features substitution cipher encryption as standard. The receiver is split into a down converter unit and IF receiver to allow the widest range of practical installations. Furthermore the power to the down converter is fed via the feeder coax to minimize installation costs. An optional Hybrid coupler and bias tee can be fitted in order to run two receivers from a single down converter along with antenna, allowing single installation to receive two channels simultaneously. 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