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Monopulse radar is a radar system that uses additional encoding of the radio signal to provide accurate directional information. The name refers to its ability to extract range and direction from a single signal pulse.
Monopulse radar avoids problems seen in conical scanning radar systems, which can be confused by rapid changes in signal strength. The system also makes jamming more difficult. Most radars designed since the 1960s are monopulse systems. The monopulse method is also used in passive systems, such as electronic support measures and radio astronomy. Monopulse radar systems can be constructed with reflector antennas, lens antennas or array antennas.
Historically, monopulse systems have been classified as either phase-comparison monopulse or amplitude monopulse. Modern systems determine the direction from the monopulse ratio, which contain both amplitude and phase information.[1][2] The monopulse method does not require that the measured signals are pulsed. The alternative name "simultaneous lobing" has therefore been suggested, but not popularized.
^Barton, David; Sherman, Samuel (2011). Monopulse Principles and Techniques.
^Frid, Henrik; Jonsson, B. L. G (2018). "Determining Installation Errors for DOA Estimation with Four-Quadrant Monopulse Arrays by using Installed Element Patterns". Proceeding of the Atlantic Radio Science Conference (AT-RASC) 2018.
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page 142. Barlow, E. J.; "Doppler Radar", Proc. IRE, vol. 37, pp. 340–355, April 1949 Page, R. M.; "MonopulseRadar", op. cit. Von Aulock, W. H.; "Properties...
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Touchstone, 1996 Colton, Roger B.; "Radar in the United States Army", Proc. IRE, vol. 33, p. 749, 1947 Page, R. M., "MonopulseRadar", IRE National Conference Record...
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