Communications: directive radio wave systems and devices (e.g. – Determining direction – Monopulse
Reexamination Certificate
2007-07-31
2007-07-31
Tarcza, Thomas H. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining direction
Monopulse
C342S080000, C342S149000, C342S158000, C342S194000
Reexamination Certificate
active
11184653
ABSTRACT:
A method and apparatus for generating accurate estimates of a radar target's azimuth and elevation angles for a phased-phased array rotating radar. Scan modulated coherently integrated (SMCI) monopulse curves are generated from a measured one-way transmit antenna pattern and three receive antenna patterns. The SMCI monopulse curves are calculated in advance for the expected beam steers. To utilize the SMCI monopulse curves, two-way Sum, Delta-Azimuth and Delta-Elevation target returns are coherently integrated, the target's monopulse ratios calculated, and the SMCI monopulse curves or polynomials used to calculate the target's U-offset and V-offset sine-space angles, which are added to the radar's beam steer to get an improved estimate of the target's sine-space angular position denoted as Utgtand Vtgt. A coordinate system transformation transforms Utgtand Vtgtto azimuth and elevation angles in a non-rotating coordinate system.
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Cangeme John
Manoogian David V.
Pitstick Gerald M.
Barker Matthew
Dawson, Esq. Walter F.
Pearson & Pearson LLP.
Pearson, Jr. Esq. John H.
Raytheon Company
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