RADIO-FREQUENCY (RF) PRECISION NULLING DEVICE
An exemplary interference nulling system includes an electromagnetic energy (e.g., RF) based system such as a radar system for transmitting radar signals and receiving return signals reflected from a target, and a nulling device having a surface for diffracting/blocking the transmitted signals to electromagnetically obscure the target. The nulling device is preferably sited between the transmitter and the target in a blanking range of the radar system.
1 . An interference nulling system, comprising:
an electromagnetic (EM) system for transmitting EM signals and receiving return signals reflected from a target; and
a nulling device having a surface for diffracting/blocking the transmitted EM signals to electromagnetically obscure the target, wherein the nulling device is sited between the transmitter and the target in a blanking range of the EM system.
2 . The system of claim 1 , wherein the the EM system is a radar system.
3 . The system of claim 1 , wherein the nulling device has height and width determined by a geometry of at least one of the target and the site.
4 . The system of claim 1 , wherein the nulling device is sited in an optical line-of-sight between the radar system and the target.
5 . The system of claim 1 , wherein the nulling device includes plural separated metal plates covered in radar-absorbing material.
6 . The system of claim 1 , wherein each edge of the nulling device is notched to cancel the signals diffracted from the surface of the nulling device.
7 . The system of claim 6 , wherein a dimension of each notch is determined by at least one of the geometry of the target and the site.
8 . A nulling device having a surface for diffracting/blocking the transmitted radar signals to electromagnetically obscure the target, wherein the nulling device is designed to be sited between an electromagnetic transmitter and a target.
9 . The nulling device of claim 8 , wherein the nulling device has height and width determined by a geometry of at least one of the target and the site.
10 . The nulling device of claim 8 , wherein the nulling device is sited in an optical line-of-sight between the electromagnetic transmitter and the target.
11 . The nulling device of claim 8 , wherein the nulling device includes plural separated metal plates covered in electromagnetic wave-absorbing material.
12 . The nulling device of claim 8 , wherein each edge of the nulling device is notched to cancel the signals diffracted from the surface of the nulling device.
13 . The nulling device of claim 8 , wherein a dimension of each notch is determined by at least one of the geometry of the target and the site.
14 . The nulling device of claim 8 , wherein the electromagnetic transmitter is a radar transmitter.