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US 8,947,647 B2Granted
Range-resolved vibration using large time-bandwidth product LADAR waveforms
AssigneeRaytheon Company
InventorsMaurice J. Halmos, Jean-Paul Bulot, Matthew J. Klotz
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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.
Claims19
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.
4 more elements
An article comprising:
- 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.
5 more elements
An apparatus, comprising:
- 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.
5 more elements
Dependencies are inferred from the claim text.