Monopulse azimuth measurement in the ATC Radar Beacon System
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1971-12-01
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Edition:Technical Report
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Abstract:A review is made of the application of sum-difference beam
techniques to the ATC Radar Beacon System. A detailed error analysis
is presented for the case of a monopulse azimuth measurement based
on the existing beacon antenna with a modified feed network. A comparison of the total expected monopulse error with the azimuth error of the existing ATCRBS indicates that there is little to be gained by a monopulse modification. Without beam sharpening, the
single-reply monopulse accuracy is less than that of the existing
system. With beam sharpening and/or by using multiple reply information,
the azimuth error is estimated to be as little as 1 or 2
Azimuth Change Pulses (ACP's), compared to 3 ACP's measured error
for the Common Digitizer. However, the monopulse modification
implies a considerable increase in system cost and complexity, and
the estimated accuracy has not so far been demonstrated in the field.
A monopulse modification for azimuth measurement in ATCRBS therefore
is not recommended. In terms of fruit reduction, an advantage is
obtainable by utilizing sum-difference techniques for artificial
beam sharpening, but other solutions may be preferable.
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