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The
WESCAM™ WISARD™ Digital
Microwave System
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Clean and
secure microwave downlink from air to ground |
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COFDM Digital
Transmit and Receive |
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Stable video
in high noise environment |
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Multipath
tolerant |
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Optional
encryption and decryption |
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Homeland
Security applications including: |
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- ALE
- Costal Patrol
- Surveillance
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WISARD™ is breakthrough digital video
transmission technology that puts real-time tactical surveillance
video in the hands of those who need it, when they need
it, without the limitations imposed by traditional analog
transmission.
WISARD™ is a proven technology that
will revolutionize tactical airborne surveillance. Providing
a clean picture in non-line-of-site conditions by using
microwave signals that bounce off structures surrounding
the tactical situation. These mulipath signals that cause
interference in traditional analog equipment are a good
source of signal for the WISARD receive equipment.
High-quality signals to tactical locations
WISARD’s breakthrough is achieved by
using a transmission technique called Coded Orthogonal
Frequency Division Multiplexing (COFDM). COFDM encodes
the video using error-correcting formulas and then transmits
it using 2000 carriers that fill the frequency band. When
the WISARD receiver captures the arriving signals, both
direct and multipath, the information on some of the 2000
carriers is degraded and contains errors. However, the
error-correcting formulas allow the correct digital information
to be recovered, resulting in a clean video display at
the receiver. COFDM technology gives the WISARD receiver
greater sensitivity than analog equipment, but should not
be expected to operate reliability in extreme non-line-of-site
conditions e.g. from an aircraft to a user deep inside
a large building. WISARD will work reliability in more
tactical situations than any other currently available
technology for real-time video.
 Solid Transmission to mobile users
The COFDM technology works continuously to
compensate for transmission signal level and multipath
conditions. Therefore, a moving user, such as a mobile
tactical command post, can receive video on the fly.
Uses less frequency spectrum
Microwave spectrum is a scarce resource.
Users with existing regulatory approval to use the spectrum
face pressure to use less. Users seeking new approvals
face greater difficulties in getting those approvals. WISARD
eases these issues by using far less spectrum than analog
microwave transmission.
Standard analog transmission channels are
17 MHz wide. WISARD features a 7.5 MHz channel width, enabling
two WISARD digital links to operate within one analog channel.
Customized channel widths are available upon request.
Request
more information
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