Most radar systems do not consider the situation where the return is dominated by the polarisation orthogonal to the polarisation transmitted by the radar. A cross-polarisation jammer exploits this limitation by transmitting a signal with this orthogonal polarisation to cause an angular error. Mathematical models of crosspolarisation monopulse patterns are derived, and their results are shown to be similar to those of five simulated monopulse antennas and one measured monopulse antenna. The polarisation accuracy of the jammer is shown to play a crucial role, with the jammer needing high polarisation accuracy. The induced angular error increases slowly when the jammer-to-signal ratio (JSR) is between 0 dB and 20 dB and increases faster when the JSR is greater than 20 dB.
Mayhew-Ridgers, Gordon; Van Jaarsveld, Paul A.; Odendaal, J.W. (Johann Wilhelm)(Institute of Electrical and Electronics Engineers, 2023-09)
The three-antenna technique is typically used in the context of absolute-gain measurements where no gain standard is required. When implemented in a spherical near-field test range, the conventional approach is to use ...
Gerber, Monique; Odendaal, J.W. (Johann Wilhelm); Joubert, Johan(Institute of Electrical and Electronics Engineers Inc, 2020-05)
Double-ridge guide horn (DRGH) antennas are widely used in antenna and EMC testing facilities as feed antennas and gain transfer standards. Increasing the low-frequency gain to obtain a more constant 3 and 10 dB beamwidth, ...
Ever-increasing bandwidth requirements from various industries drive the need for the ever-increasing bandwidth of antennas used for testing. Broadband Double-Ridged Guide Horn (DRGH) antennas are used extensively in antenna ...
