翻訳と辞書 Words near each other ・ Phase telescope ・ Phase Three ・ Phase transformation crystallography ・ Phase transition ・ Phase transitions and critical phenomena ・ Phase variation ・ Phase velocity ・ Phase VII ・ Phase vocoder ・ Phase-boundary catalysis ・ Phase-change Dual ・ Phase-change incubator ・ Phase-change material ・ Phase-change memory ・ Phase-coherent holography ・ Phase-comparison monopulse ・ Phase-contrast imaging ・ Phase-contrast X-ray imaging ・ Phase-fired controllers ・ Phase-locked loop ・ Phase-locked loop ranges ・ Phase-out of incandescent light bulbs ・ Phase-out of lightweight plastic bags ・ Phase-shift keying ・ Phase-shift mask ・ Phase-shift oscillator ・ Phase-transfer catalyst ・ Phase-type distribution ・ Phase2 International (company) ・ Phase5 Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Phase-comparison monopulse ： ウィキペディア英語版 Phase-comparison monopulse Phase-comparison monopulse (also called phase-interferometry) describes a technique that can be used in radar and direction finding applications to accurately estimate the direction of arrival of a signal from the phase difference of the signal measured on two (or more) separated antennas. ==Mathematics== Assume two antenna separated by a distance ''d'', with a wavefront incident at an angle θ, then the extra path the signal must travel between Antenna 1 and Antenna 2 (see figure) results in a phase difference, ΔΦ, between the two antennas. This can be used to calculate the direction of arrival using: :$\backslash theta\; =\; \backslash sin^\; \backslash left(\; \backslash frac\; \backslash right)$ where λ is the signal's wavelength. For unambiguous results, the antennas should be spaced half a wavelength apart, or less. However, this can result in significant mutual coupling between elements, which means that each antenna's phase measurement will be corrupted by the other's. The approach assumes that the phase centres of the antennas are exactly known. With more complex antenna structures (such as the log-periodic antenna) the effects of mutual coupling can make the phase centre locations unknown. In this case, calibration or electromagnetic modeling may be required. The ability to accurately measure a signal's phase depends on the signal-to-noise ratio (SNR), and hence the accuracy of this technique is dependent on the SNR. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Phase-comparison monopulse」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.