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This condition causes look direction error.
In the monopulse beamforming, the pattern look direction must be exactly known.
The pattern look direction in the current monopulse processing period is fixed and provided by the angle tracking loop filter.
Simulation results demonstrate that the proposed algorithm can maintain high anti-jamming capability and angle estimation performance when look direction error exists.
This kind of SV mismatch model is universal because it can be caused by calibration error, local scattering error, look direction error, and so on.
The simulation results demonstrate that the proposed algorithm can maintain high angle estimation accuracy in the mainlobe region when look direction error exists.
When look direction error exists, the constraint mismatches the SOI direction, and the main lobe of the beam pattern may be distorted.
The array takes on more characteristics of a far-field array where the vertical direction MLW is so large that one only considers the angle or look direction instead of a focal point.
The proposed robust adaptive monopulse algorithm can achieve high-angle estimation accuracy and good robustness to look direction error while expending only one additional degree of freedom compared to conventional LCMV-based method.
Given a look direction, the directive response is obtained for all scenarios.
Furthermore, it requires a specific look direction.
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