Far-field uncertainty due to random near-field measurement error |
| |
Authors: | Hoffman JB Grimm KR |
| |
Affiliation: | Technol. Service Corp., Silver Spring, MD; |
| |
Abstract: | Recent planar near-field scanning tests with ultralow-sidelobe antennas have confirmed that random near-field measurement errors will ultimately limit the accuracy of far-field patterns. A formulation is outlined for estimating the spectral signal-to-noise ratio (SNR) arising from noncorrectable near-field random measurement errors. The formulation applies to arbitrarily directive test antennas and probes-even nulling probes. A far-field parameter, called the scan plane coupling factor, may be computed directly from the near-field data, and then used to form the spectral SNR. The accuracy of the spectral SNR is confirmed by simulation and by actual tests with low-sidelobe AWACS array antenna |
| |
Keywords: | |
|
|