Phase-comparison monopulse

Phase interferometrymonopulsephasephase comparison
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.wikipedia
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Direction finding

radio direction findingradio direction-findingdirection-finding
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.

Monopulse radar

monopulsemonopulse technique
Historically, monopulse systems have been classified as either phase-comparison monopulse or amplitude monopulse.

Radar

radar stationradarsradar system
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.

Log-periodic antenna

log periodic antennalog-periodicLog-periodic dipole array
With more complex antenna structures (such as the log-periodic antenna) the effects of mutual coupling can make the phase centre locations unknown.

Computational electromagnetics

Electromagnetic modelingcomputational electrodynamicselectromagnetic simulation
In this case, calibration or electromagnetic modeling may be required.

Signal-to-noise ratio

signal to noise ratioSNRsignal-to-noise
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.

Transponder landing system

TLSTransponder Landing System (TLS)
After receiving a response, TLS determines the aircraft's location using three sets of antenna arrays: one for horizontal position using monopulse techniques, the other for vertical monopulse and a third for trilateration.

Active electronically scanned array

AESAAESA radaractive phased array
The rough direction can be calculated using a rotating antenna, or similar passive array using phase or amplitude comparison.

Kolchuga passive sensor

KolchugaKol'chuhaKolchuga air defense system
The dishes may exploit amplitude monopulse techniques for improved direction finding, whilst the angled spacing of the log-periodic antenna suggests that they may use phase interferometry to improve angle measurements.

AI Mk. IV radar

AI Mk IVAI Mk. IVAI Mark V
The team seriously considered phase comparison as a solution, but could not find a suitable phase shifting circuit.

Passive radar

passivePassive (multistatic) radaranti-radar homing
Alternatively, some research systems have used only a pair of antenna elements and the phase-difference of arrival to calculate the direction of arrival of the echoes (known as phase interferometry and similar in concept to Very Long Baseline Interferometry used in astronomy).