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Using COFDM microwave links in mission-critical apps

Posted: 25 Jul 2011 ?? ?Print Version ?Bookmark and Share

Keywords:Aerial downlinking? COFDM? coded orthogonal frequency division multiplexing? microwave?

In a hostage situation, MobilCMDR can be used on the receiving end with a body worn camera/transmitter by a member of the SWAT team. The SWAT team member can transmit video from his location whether it be perimeter surveillance or inside a building. Thus, the MobilCMDR is used as a force multiplier in creating a vision not normally used in these tactical operations. When used in this way, someone in tactical command can give directions and intelligence to the team to efficiently ensure operation success.

In addition, bomb squads can also use the MobilCMDR in robotic video applications for bomb disposal, monitoring or detection. The use of an EOD robot and the small handheld receiver are viewing the robot visual area of action. They can also transmit the video to more than just one person in the command and control group. As a result, numerous members of the squad can examine the video and get an idea of just how serious the situation is without having to get too close. This outlook enables the team to ascertain the best scenarios to diffuse the situation.

How it works
The MobilCMDR receives microwave signals from two different antennas, and then combines the signal inputs to provide a superior non-line-of-sight video. This combining technique with diversity reception is known as maximum ratio combining. All of the features of the MobilCMDR receiver, including, the high brightness screen, (the monitor can be seen even in sunlight) enables a COFDM receiver/monitor for government, law enforcement and security applications.

In order to address a wide range of applications, the device features on screen display, Ethernet monitoring for remote control access, and IP encapsulation for Internet broadcast. It can deliver either SD or HD (SDI) video, depending on which built-in decoder is specified. It is designed for intuitive, straightforward operating and is housed in a compact chassis with optional recording capabilities. The MobilCMDR is available in L-Band, S-Band and C-Band frequency ranges and has AES decryption capabilities that make it suited for applications ranging from public safety monitoring to covert surveillance.

The MobilCMDR supports a range of video input and output formats, including ASI and HD/SD SDI. This will allow the unit to function in many receive applications including portable, remote and command center operations. Further, offering H.264 decoding, it displays COFDM video transmissions using a built-in internal eight inch class 16:9 format screen. The unit also allows for multiple remote viewers to monitor the same video simultaneously. Well suited for the variety of field applications, the MobilCMDR's milled aluminum chassis and ergonomic hand grips are weather resistant.

The administration software package also allows users to configure and store up to 16 custom preset configurations. The presets can store as little or as much information as the administrator wishes. The simplicity of this configuration enables the end user to completely control this process. These values can then be locked in place, providing simple and reliable operation. The MobilCMDR employs AES encryption preventing unauthorized viewing from decoding or eavesdropping.

The unit's On-Screen Display (OSD) feature exhibits an information summary, and also includes signal strength, demodulator lock, decryption active and decoding indicators. This can be helpful in remote operations with hostile environmental conditions. These figures give the ability to the user to ensure interoperability between the transmissions systems and the receive systems.

- Stephen Shpock
??President
??Integrated Microwave Technologies

To download the PDF version of this article, click here.


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