What is DRFM technology?
Digital Radio Frequency Memory (DRFM) is an electronic method for digitally capturing and retransmitting RF signals. DRFM systems are typically used in radar jamming, although applications in cellular communications are becoming more common.
How does a DRFM work?
A DRFM, or digital radio frequency memory, system performs real-time processing of received signals, typically radar. By digitizing, processing and transmitting an adversary’s radar pulses, a DRFM can deceive the radar system, which is especially critical to protect against radar-guided missiles.
How does a DRFM jammer work?
Digital frequency radio memory, or DRFM, is a repeater technique that confuses a radar by altering and re-transmitting received radar energy. For example, by changing the delay in transmission of pulses, the jammer can alter the range the radar detects and creating false targets.
What is denial jamming?
One EA technique is denial jamming. Put simply, if an enemy system emits one frequency with a particular pulse-width and pulse interval, your system detects and identifies that signal. It then blasts a massive amount of noise at that frequency, jamming the enemy and preventing that frequency from being used.
What is coherent jamming?
An Effective Coherent Noise Jamming Method for Deception of Wideband LFM Radars. The proposed jamming technique the jamming signal is acquired by dividing the intercepted radar signal into several equal chunks by bandwidth division, and then finds optimal retransmission order.
Are jammers illegal?
The use of a phone jammer, GPS blocker, or other signal jamming device designed to intentionally block, jam, or interfere with authorized radio communications is a violation of federal law. It is also unlawful to advertise, sell, distribute, import, or otherwise market jamming devices to consumers in the United States.
Which is the most important feature of DRFM?
The most significant aspect of DRFM is that, as a digital “duplicate” of the received signal, it is consistent with the source of the received signal. Moreover, it can act as a waveform synthesizer (non-coherent replicas).
Which is the key element of coherent ECM?
The key element to implement coherent ECM techniques is the Digital Radio Frequency Memory (DRFM). The DRFM is the core of a super-heterodyne selective receiver that is the basic response channel architecture in any jammer system where a narrow band of signal has to be handled at time for jamming purposes.
How is a slice repeater used in DRFM?
Slice repeater is a coherent DRFM functional mode capable to reconstructing a coherent jamming replica using only a little part (slice) of the incoming signal (Figure 3). This will allow receiving only for a while and transmitting before the end of the incoming pulse: the alternation between RX and TX operation is made inside the pulse only once.