Direction of Arrival Deception Using Metasurfaces

The invention of radars was soon followed by extensive research and development of counter measures, the most well-known being the invention of stealth technology. By employing special geometric designs and carefully selected materials, a reduction of the target’s radar cross section and the resulting backscattered energy was successfully achieved, substantially reducing distances between the radar and the target for successful detection. In addition to stealth technology, numerous active jamming countermeasures have been developed.

Metamaterial-based invisibility cloaking, which was considered a promising solution, did not yet succeed in delivering reliable performance against real radar systems, mainly due to its narrow operational bandwidth. 
We propose a novel approach, which addresses the issue from a signal-processing standpoint and, as a result, is capable of coping with many radar systems by exploiting vulnerabilities in their design.
Our semi-passive approach to radar invisibility does not require transmitting signals to confuse or jam the radar, nor does it require a lot of a priori knowledge about the type of radar at hand. Instead, a temporally modulated reflecting coating is suggested, which can control the time-dependent phase of the electromagnetic field as it is backscattered toward the interrogating radar.
Figure 1. below Illustrates the proposed invisibility concept. Two airplanes and a mountain are shown reflecting echoes back into the interrogating radar. The left plane is coated with a special metasurface, which dynamically controls the phase of the scattered electromagnetic pulse back into the radar. Temporal modulation of the metasurface causes the reflected phase to remain unchanged in time, even though the airplane is moving. This serves to conceal the Doppler signature of the aircraft, making it appear as stationary as the surrounding clutter (i.e., the ground or the mountains near the radar). This causes the radar to filter out the cloaked target together with the stationary clutter, rendering it invisible. The second airplane appears clearly against the backdrop of the mountains, even though it is a much smaller scatterer, due to the fact it can be detected using its Doppler signature.
Similar technology allows equipping the metasurface cover with additional functions, including those that are capable of confusing the Detection of Arrival  (DoA) unit and also (for certain radar waveforms) to deceit the range bin, including the creation of the illusion of an artificial range rate. Those 3 main functions (i) artificial Doppler, (ii) artificial DoA, and (iii) artificial range, including the range rate, can completely deceive a radar system.

• Military Aircrafts
• Naval Vessels 
• Missiles
• Unmanned Aerial Vehicles (UAVs).
• Ground Vehicles


Patent pending, PCT stage.

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