Method for three-dimensional beam forming in direction finding systems
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United States of America Patent
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Jan 23, 2001
Grant Date -
N/A
app pub date -
Mar 24, 1999
filing date -
May 19, 1998
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Abstract
For improving 3D focussing and side lobe suppression in a direction finding system identical groups of transducers are provided at each side of a first and a second axis, which are inclined by an angle 0.degree..noteq..psi.<180.degree., preferable .psi.=90.degree.. A first magnitude summation signal is derived from the first pair of transducer groups associated with the first axis and a second magnitude summation signal is derived from the second pair of transducer groups associated with the second axis. Furthermore, a differential signal is derived between the complex output signal of each pair of transducers. For each axis the absolute value of said differential signal is subtracted from the associated magnitude summation signal. The resulting two output signals, associated with said two axis, are then combined to finally obtain a three-dimensionally focussed beam pattern.
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