Methods and apparatus for determination of a filter center frequency
First Claim
1. A method for calculating a center frequency and a bandwidth for a radar doppler filter, the center frequency and bandwidth calculated to provide radar performance over varying terrain and aircraft altitude, pitch, and roll by keeping a doppler swath centered in an antenna beam, said method comprising:
- receiving an antenna mounting angle, a slant range, and velocity vectors in body coordinates;
calculating a range swath doppler velocity, and a track and phase swath bandwidth using the antenna mounting angle, slant range, and velocity vectors;
calculating a phase swath doppler velocity based at least in part on the range swath doppler velocity and the track and phase swath bandwidth;
calculating a range swath center frequency based on the range swath doppler velocity;
calculating a phase swath center frequency based on the phase swath doppler velocity; and
calculating a level and verify swath bandwidth based upon the track and phase swath bandwidth.
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Abstract
A method for calculating a center frequency and a bandwidth for a radar doppler filter is herein described. The center frequency and bandwidth are calculated to provide radar performance over varying terrain and aircraft altitude, pitch, and roll. The method includes receiving an antenna mounting angle, a slant range, and velocity vectors in body coordinates, calculating a range swath doppler velocity, a track and phase swath bandwidth, and a phase swath doppler velocity. The method continues by calculating a range swath center frequency based on the range swath doppler velocity, calculating a phase swath center frequency based on the phase swath doppler velocity, and calculating a level and verify swath bandwidth based upon the track and phase swath bandwidth.
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Citations
10 Claims
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1. A method for calculating a center frequency and a bandwidth for a radar doppler filter, the center frequency and bandwidth calculated to provide radar performance over varying terrain and aircraft altitude, pitch, and roll by keeping a doppler swath centered in an antenna beam, said method comprising:
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receiving an antenna mounting angle, a slant range, and velocity vectors in body coordinates;
calculating a range swath doppler velocity, and a track and phase swath bandwidth using the antenna mounting angle, slant range, and velocity vectors;
calculating a phase swath doppler velocity based at least in part on the range swath doppler velocity and the track and phase swath bandwidth;
calculating a range swath center frequency based on the range swath doppler velocity;
calculating a phase swath center frequency based on the phase swath doppler velocity; and
calculating a level and verify swath bandwidth based upon the track and phase swath bandwidth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A processor configured to:
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receive an antenna mounting angle, a slant range, and velocity vectors in body coordinates;
calculate a range swath doppler velocity, and a track and phase swath bandwidth using the antenna mounting angle, slant range, and velocity vectors;
calculate a phase swath doppler velocity based at least in part on the range swath doppler velocity and the track and phase swath bandwidth;
calculate a range swath center frequency based on the range swath doppler velocity;
calculate a phase swath center frequency based on the phase swath doppler velocity; and
calculate a level and verify swath bandwidth based upon the track and phase swath bandwidth.
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Specification