Digital radio frequency memory for signal simulation

Converts an incoming analog RF signal to a digital signal allowing for digital signal processing and retransmission as an analog RF signal


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A Digital Radio Frequency Memory (DRFM) system is designed to digitize an incoming RF signal at a frequency and bandwidth to adequately represent the signal and then reconstruct the RF signal when required for retransmission. Using DRFM provides for digital duplication of the received signal without the signal degradation normally associated with analog memory loops, which continuously cycle energy through a front end amplifier allowing greater range error during jamming and other applications.

In the past DFRMs relied on high-speed emitter coupled logic circuits to perform the function of delaying radio frequency signals. The engineering cost associated with these high-speed circuits generally made commercially available DRFM systems cost prohibitive for many applications.

As a low-cost alternative, Navy researchers have developed a DRFM from mainly commercially available components. The DRFM can also change the signal frequency in the range of plus or minus 100,000 KHz which places a Doppler on the signal. The Doppler makes the RF signal look like an aircraft either traveling toward or away from the circuit and its antenna.

The circuit provides a means for simulating the RF signals from the flight of an aircraft without the cost associated with flying an aircraft. These costs can be as much as $4,000 an hour.

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