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Switching off a radar set electronically for a predetermined length of time or, “blanking,” is way to mitigate the effects of electromagnetic interference (EMI) in a transmitter or receiver. The tactic is used when multiple communication, navigation, radio, or other EMI emitting devices are used in close proximity. Unfortunately blanking a receiver stops its ability to receive all or part of a signal.
Navy scientists and engineers have developed a blanking system that addresses the above problem. A control system generates blanking signals for various types of receiver and transmitter combinations. These are generated based on the signal characteristic information stored in memory including a delay following receipt of a pre-trigger signal from a transmitter and a pulse width of control signals generated for specified receivers. Control signals are routed to a related receiver to reduce or eliminate interference effects. The system deals with variables such as:
- High number of transmitter and receiver combinations
- Cable length to and between various components in the blanking system
- Capacity of processors and signal buffers to simultaneously process signals for a large number of inputs and outputs
- Sources of reflection
- Distance from each transmitter to its antenna
- Size and power limitations on test or end-units which incorporate a blanking system
- Receiver sensitivity
Data representing associated RF transmitters and receivers can be determined, synchronized, and stored in data structures during testing operations until the received interference signals are properly aligned, synchronized, or controlled at an associated receiver.
- Controls signal interference across a number of devices
- FPGAs route each transmitter signal to the blanking channels and can be programmed to accommodate new types of transmitters
- Modified control signal data can be stored in memory and used for future signal generation
- US patent 8,150,325 available for license