Line scan radar antenna using a single motor
First Claim
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1. A line scan radar antenna comprising:
- a secondary reflector,a motor,a shaft coupling the motor to the secondary reflector, the axis of the shaft forming an angle α
with the axis of symmetry of the secondary reflector,means affixed to the shaft for translating the shaft in a direction transverse to the axis of the shaft in response to the rotation of the motor and secondary reflector, anda primary reflector which receives radar rays reflected off the secondary reflector and reflects them in a line scan.
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Abstract
According to the present invention, radar rays are reflected off a rotatingecondary reflector which is both tilted with respect to and synchronously translated, in simple harmonic motion, in a direction transverse to the axis of rotation of the secondary reflector. The combined effect of the tilting and translating of the secondary reflector is to produce a line scan when the rays from the secondary reflector are reflected off a primary reflector.
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Citations
10 Claims
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1. A line scan radar antenna comprising:
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a secondary reflector, a motor, a shaft coupling the motor to the secondary reflector, the axis of the shaft forming an angle α
with the axis of symmetry of the secondary reflector,means affixed to the shaft for translating the shaft in a direction transverse to the axis of the shaft in response to the rotation of the motor and secondary reflector, and a primary reflector which receives radar rays reflected off the secondary reflector and reflects them in a line scan. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of line scanning a radar antenna comprising the steps:
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rotating the shaft of a motor, affixing a secondary reflector to the end of the shaft, tilting the axis of symmetry of the secondary reflector to an angle α
with the axis of the shaft,translating the secondary reflector in oscillatory fashion in a direction transverse to the direction of the shaft axis, synchronizing the secondary reflector translation with the shaft rotation, reflecting a radar ray off the tilted, rotating secondary reflector, to obtain a reflector ray which scans in a direction perpendicular to the transverse direction, limiting the amount of translation to that required to cancel the angular displacement of the radar ray in the direction transverse to the shaft axis due to the tilt of the secondary reflector, reflecting the ray from the secondary reflector into a primary reflector, and reflecting a line scan pattern from the primary reflector. - View Dependent Claims (8, 9, 10)
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Specification