Cobham Antenna Systems miniaturised INterference CANcellation (mINCAN) system eliminates mutual interference when multiple radio systems are integrated into tactical land, marine and airborne platforms.
The complexity of modern communications and counter IED
systems combines with the
compactness of the platforms they are installed on to create
major co-site interference problems. This is made much worse
when frequency agile radios and broadband monitoring receivers
are involved. The result is that many receivers will receive
levels of interference from co-sited transmitters that cause
unacceptable noise levels and some receivers may be driven into
The principle of Cobham Antenna Systems Interference
Cancellation system is deceptively simple: the removal of
interference by injecting an accurately scaled anti-phase
version of the interfering RF signal. This can be achieved for
multiple transmitters and receivers from HF through to microwave
The principle is similar to acoustic noise cancellation systems
in car phones and hearing aids. mINCAN can handle very high levels
of received interference and at the high hopping speeds of modern
frequency agile transmitters. A sample of the signal from the
co-sited transmitter is taken using a directional coupler in the
transmit antenna feed. It is then scaled in phase and amplitude
before being algebraically added to the receive path to cancel out
the co-sited interference.
Modular and Adaptable
Multiple interfering transmitters can be cancelled by allocating
a cancelling module for each interfering transmitter.
mINCAN is fully adaptive, it does not need a direct interface to
the transmitter or receiver. By interfacing only with the
antenna feed cables it ensures that installation on new or legacy
platforms is a straight forward process. The benefit of mINCAN's
high speed cancellation is effective before the interfering signal
reaches its full amplitude. This ensures that receiver
blocking does not occur.