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・ Amplitude amplification
・ Amplitude and phase-shift keying
・ Amplitude damping channel
・ Amplitude death
・ Amplitude distortion
・ Amplitude domain reflectometry
・ Amplitude gate
・ Amplitude modulation
・ Amplitude modulation signalling system
・ Amplitude of accommodation
・ Amplitude of low frequency fluctuations
・ Amplitude panning
・ Amplitude Studios
・ Amplitude versus offset
・ Amplitude-companded single-sideband modulation
Amplitude-Comparison Monopulse
・ Amplitude-shift keying
・ Amplituhedron
・ AmpLive
・ Amplypterus
・ Amplypterus celebensis
・ Amplypterus mansoni
・ Amplypterus mindanaoensis
・ Amplypterus panopus
・ Amplypterus sumbawanensis
・ Ampm
・ Ampney
・ Ampney Crucis
・ Ampney St Mary
・ Ampney St Peter


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Amplitude-Comparison Monopulse : ウィキペディア英語版
Amplitude-Comparison Monopulse

Amplitude monopulse direction finding refers to a common technique employed in radar systems to improve the accuracy with which the direction of arrival of a pulse can be estimated.
==Approach==
Two overlapping antenna beams are formed, which are steered in slightly different directions, usually such that they overlap at the 3dB-point of the beams.〔(Amplitude Comparison Monopulse ) - Introduction of Radar Analysis〕 By comparing the relative amplitude of the pulse in the two beams, its position in the beams can be determined with an accuracy dependent on the signal-to-noise ratio (SNR). An accuracy of a tenth of beamwidth can be achieved with an SNR of 10dB.
In most implementations, two signals are formed, one being the sum of the two beams, and the other being the difference of the two beams. The ratio of these two beams normalises the difference signal and allows the direction of arrival of the signal to be calculated. The shape of the antenna beams must be known exactly and hence the accuracy of the techniques can be affected by unwanted multipath reflections.〔(Amplitude-Comparison Monopulse ) - Tracking Radar, Chap 18, p. 9〕

Image:MonopulseBeams.gif|Two beams, steered so that they overlap
Image:MonopulseSum.gif|Sum of the two beam patterns
Image:MonopulseDiff.gif|Difference of the two beam patterns
Image:MonopulseRatio.gif|Ratio of the sum-difference patterns


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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