Range-resolved vibration using large time-bandwidth product LADAR waveforms
First Claim
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1. A method, comprising:
- forming range bins from range compressed data, the range compressed data comprising a train of coherent pulses formed from a return signal originating from a transmitted signal reflected from an object, the transmitted signal generated by a laser detection and ranging (LADAR) sensor, the train of coherent pulses having a large time-bandwidth product, the large time-bandwidth product being a product of coherent integration time times a bandwidth, the large time-bandwidth product being greater than 100;
for each range bin,compensating for motion of the LADAR sensor;
performing a Fourier transform on the range compressed data;
determining a centroid of individual velocity measurements by determining an instantaneous Doppler frequency of a peak intensity of each vertical line that represents an instantaneous velocity at that point in time; and
performing a Fourier transform of the centroid to determine a vibration.
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Abstract
In one aspect, a method includes forming range bins from range compressed data, the range compressed data comprising a train of coherent pulses formed based on a transmitted signal from a laser detection and ranging (LADAR) sensor and having a large time-bandwidth product and for each range bin, compensating for motion of the LADAR sensor, performing a Fourier transform on the compressed range data, determining a centroid of individual velocity measurements and performing Fourier transform of the centroid to determine a vibration.
65 Citations
19 Claims
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1. A method, comprising:
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forming range bins from range compressed data, the range compressed data comprising a train of coherent pulses formed from a return signal originating from a transmitted signal reflected from an object, the transmitted signal generated by a laser detection and ranging (LADAR) sensor, the train of coherent pulses having a large time-bandwidth product, the large time-bandwidth product being a product of coherent integration time times a bandwidth, the large time-bandwidth product being greater than 100; for each range bin, compensating for motion of the LADAR sensor; performing a Fourier transform on the range compressed data; determining a centroid of individual velocity measurements by determining an instantaneous Doppler frequency of a peak intensity of each vertical line that represents an instantaneous velocity at that point in time; and performing a Fourier transform of the centroid to determine a vibration. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An article comprising:
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a non-transitory machine-readable medium that stores executable instructions, the instructions causing a machine to; form range bins from range compressed data, the range compressed data comprising a train of coherent pulses formed from a return signal originating from a transmitted signal reflected from an object, the transmitted signal generated by a laser detection and ranging (LADAR) sensor, the train of coherent pulses having a large time-bandwidth product, the large time-bandwidth product being a product of coherent integration time times a bandwidth, the large time-bandwidth product being greater than 100; for each range bin, compensate for motion of the LADAR sensor; perform a Fourier transform on the range compressed data; determine a centroid of individual velocity measurements by determining an instantaneous Doppler frequency of a peak intensity of each vertical line that represents an instantaneous velocity at that point in time; and perform a Fourier transform of the centroid to determine a vibration. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An apparatus, comprising:
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circuitry to; form range bins from range compressed data, the range compressed data comprising a train of coherent pulses formed from a return signal originating from a transmitted signal reflected from an object, the transmitted signal generated by a laser detection and ranging (LADAR) sensor, the train of coherent pulses having a large time-bandwidth product, the large time-bandwidth product being a product of coherent integration time times a bandwidth, the large time-bandwidth product being greater than 100; for each range bin, compensate for motion of the LADAR sensor; perform a Fourier transform on the range compressed data; determine a centroid of individual velocity measurements by determining an instantaneous Doppler frequency of a peak intensity of each vertical line that represents an instantaneous velocity at that point in time; and perform a Fourier transform of the centroid to determine a vibration. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification