Communications: directive radio wave systems and devices (e.g. – Determining direction – Low angle processing
Reexamination Certificate
1989-11-08
2008-08-26
Sotomayor, John B (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining direction
Low angle processing
C342S149000, C342S152000, C342S154000, C342S194000
Reexamination Certificate
active
07417584
ABSTRACT:
A monopulse radar operating at low angles of elevation (LOE) receives returns from a target by a direct path and by a path including a reflection from that portion of the Earth's surface lying between the radar and the target. The surface-reflected signal tends to cause errors in the estimate of the elevation of the target. A radar system directs at least upper and lower overlapping beams at LOE toward the target for receiving returns. The upper and lower beams may be sequential or simultaneous. Real and imaginary portions of the sum (Σ) and difference (Δ) signals are generated for each beam. The monopulse estimates of elevation ê derived from the real portion of the Σ and Δ signals are processed to produce correction signals for upper and lower beams. Each correction signal is weighted and summed to correct the estimate of elevation.
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Morris Randall Deen
Reifler Frank Joshua Raphael
Duane Morris LLP
Lockheed Martin Corporation
Sotomayor John B
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