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公开(公告)号：US20210341607A1
公开(公告)日：2021-11-04
申请号：US16863858
申请日：2020-04-30
Applicant: RAYTHEON COMPANY
Inventor： Adam Hodge Greenberg , Eran Marcus
Abstract: Lidar and method for generating repeatable PPM waveforms to determine a range to a target include: a processor for a) creating a modulation pool, based on a maximum nominal PRF and a specified final PPM code length of N; b) obtaining a seed code; c) eliminating bad modulation levels from the modulation pool to generate a good modulation pool, d) selecting a modulation level from the good modulation pool; e) concatenating the selected modulation level to the seed code to generate an i-element modulation sequence; f) repeating steps c to e N times to generate an N-element modulation sequence; g) selecting a PRF less than the maximum nominal PRF; and h) generating a repeatable PPM waveform by applying the N-element modulation sequence to the selected PRF.
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公开(公告)号：US20210341579A1
公开(公告)日：2021-11-04
申请号：US16863826
申请日：2020-04-30
Applicant: RAYTHEON COMPANY
Inventor： Adam Hodge Greenberg , Eran Marcus
Abstract: A lidar for generating long PPM waveforms includes: receiving an initial PPM code element and a desired maximum sidelobe height; b) generating a two-column lookup table; c) selecting a candidate modulation level from a pool of available elements; d) identifying the differences between the selected candidate modulation value and each of the code values in the initial PPM code and incrementing corresponding values in the lookup table; e) comparing the values of the lookup table against the desired maximum sidelobe height; f) when a value exceeds the desired maximum sidelobe height, discarding the candidate modulation level, decrementing the corresponding values in the lookup table and repeating steps c to g; g) otherwise, appending the candidate modulation level to the end of the initial PPM code to update the initial code, and repeating steps c to e N times to generate a PPM waveform of length N.
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公开(公告)号：US20210341578A1
公开(公告)日：2021-11-04
申请号：US16863792
申请日：2020-04-30
Applicant: RAYTHEON COMPANY
Inventor： Adam Hodge Greenberg , Eran Marcus
IPC: G01S7/484
Abstract: System and method for generating Pulse Position Modulated (PPM) lidar waveforms generating Pulse Position Modulated (PPM) waveforms in a lidar includes: a) creating a modulation pool, based on a maximum nominal pulse repetition frequency (PRF); b) eliminating bad modulation levels from the modulation pool to generate a good modulation pool; c) selecting a modulation level from the good modulation pool to generate a PPM code element; d) repeating steps b and c N times to generate an N-element PPM code, wherein the PPM code is PRF independent; e) selecting a PRF less than the maximum nominal PRF; f) generating a PPM waveform by applying the N-element PPM code to the selected PRF; and g) transmitting the PPM waveform by the lidar toward a target to determine a range to the target.
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公开(公告)号：US11658451B2
公开(公告)日：2023-05-23
申请号：US16928512
申请日：2020-07-14
Applicant: Raytheon Company
Inventor： Robert D. Stultz , Derek Hendry , Eran Marcus
CPC classification number: H01S3/06754 , G01S7/484 , G01S17/10 , H04B10/504
Abstract: A laser transmitter including a waveform controller arranged to generate a waveform script having at least one of a pulse repetition frequency setting, a pulse duration setting, and a pulse amplitude pre-warp setting. The transmitter also includes an optical waveform generator arranged to: i) receive the waveform script, ii) generate pre-warped signal pulses based on the waveform script to compensate for gain distortion effects of a laser power amplifier, and iii) output the pre-warped signal pulses. The laser power amplifier is arranged to: i) receive the pre-warped signal pulses, ii) receive a continuous wave signal, and iii) output amplified signal pulses that maintain a substantially constant drive intensity at the input of a non-linear wavelength converter. The non-linear wavelength converter is arranged to receive the amplified signal pulses and emit wavelength-converted pulses.
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公开(公告)号：US11555896B2
公开(公告)日：2023-01-17
申请号：US16863826
申请日：2020-04-30
Applicant: RAYTHEON COMPANY
Inventor： Adam Hodge Greenberg , Eran Marcus
Abstract: A lidar for generating long PPM waveforms receives an initial PPM code element including a number of code elements and a desired maximum sidelobe height; b) generates a two-column lookup table; c) selects a candidate modulation level; d) compares the values of the number of times a code element difference has been observed in the initial PPM code element from the lookup table against the desired maximum sidelobe height; e when a value of the number of times exceeds the desired maximum sidelobe height, discards the selected candidate modulation level, decrements corresponding values in the lookup table and repeats steps c to d; f otherwise, appends the selected candidate modulation level to the end of the initial PPM code element to update the initial PPM code element, and repeats steps c to f N times to generate a PPM waveform of length N.
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Patent Agency Ranking
公开(公告)号：US11513218B2
公开(公告)日：2022-11-29
申请号：US16863055
申请日：2020-04-30
Applicant: RAYTHEON COMPANY
Inventor： Adam Hodge Greenberg , Eran Marcus
Abstract: A transmitter for communication-less bistatic ranging includes a photon emitter configured to emit a plurality of photons at particular times in a pointing direction, and a processor configured to identify a particular sub-code of a plurality of sub-codes based on a dynamic state of the transmitter, each one of the plurality of sub-codes including a portion of a long optimal ranging code, generate a plurality of encoded pulse timings by dithering pulse timings from a nominal repetition frequency based on the particular sub-code, and control the photon emitter to emit the plurality of photons at the plurality of encoded pulse timings.
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公开(公告)号：US20200371240A1
公开(公告)日：2020-11-26
申请号：US16419768
申请日：2019-05-22
Applicant: Raytheon Company
Inventor： Arthur M. Newman , Eran Marcus , Brian Boland
Abstract: A measured photo-event array is converted from two spatial coordinates and one temporal coordinate into three spatial coordinates for real-time imaging. Laser light pulses illuminate at least one object, and a Geiger-mode avalanche photodiode array receives photons from laser light reflected off the object. For each pulse of the laser light, the GMAPD outputs a first array of photo-events representative of reflected photons. A three-dimensional (3D) Gaussian distribution kernel arranged as a list of array locations to be processed and weight list(s) are provided. The weight list(s) specify an amount array values are scaled based on the Gaussian distribution or photon arrival time. A graphics processing unit arranges the first array of measured photo-events as a list, convolves the Gaussian displacement list with the list of measured photo-events to produce a convolution output, and applies weights from the weight list(s) to the values to produce a density point cloud.
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公开(公告)号：US11822015B2
公开(公告)日：2023-11-21
申请号：US16863792
申请日：2020-04-30
Applicant: RAYTHEON COMPANY
Inventor： Adam Hodge Greenberg , Eran Marcus
IPC: G01S7/484
CPC classification number: G01S7/484
Abstract: System and method for generating Pulse Position Modulated (PPM) lidar waveforms generating Pulse Position Modulated (PPM) waveforms in a lidar includes: a) creating a modulation pool, based on a maximum nominal pulse repetition frequency (PRF); b) eliminating bad modulation levels from the modulation pool to generate a good modulation pool; c) selecting a modulation level from the good modulation pool to generate a PPM code element; d) repeating steps b and c N times to generate an N-element PPM code, wherein the PPM code is PRF independent; e) selecting a PRF less than the maximum nominal PRF; f) generating a PPM waveform by applying the N-element PPM code to the selected PRF; and g) transmitting the PPM waveform by the lidar toward a target to determine a range to the target.
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公开(公告)号：US11480678B2
公开(公告)日：2022-10-25
申请号：US16863484
申请日：2020-04-30
Applicant: RAYTHEON COMPANY
Inventor： Adam Hodge Greenberg , Eran Marcus
IPC: G01S17/10 , G01S7/484 , G01S7/4861 , G01S7/487
Abstract: A method for operating a laser detection and ranging system. In some embodiments, the method includes transmitting a plurality of laser pulses, each at a respective one of a plurality of pulse transmission times; detecting a plurality of return pulses, each at a respective one of a plurality of return pulse times; forming a first time difference, the first time difference being the difference between a first return pulse time of the plurality of return pulse times and a first pulse transmission time of the plurality of pulse transmission times; and incrementing a first element of a first array, the first element of the first array having an index based on the first time difference.
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公开(公告)号：US20220206152A1
公开(公告)日：2022-06-30
申请号：US17138386
申请日：2020-12-30
Applicant: Raytheon Company
Inventor： Adam Hodge Greenberg , Eran Marcus
IPC: G01S17/89 , G01S7/481 , G01S7/4861
Abstract: An apparatus, and method of operating the same processes of LADAR data including iterating back and forth between target detection in a 2-D array having range and range rate dimension, and a 4-D array having azimuth, azimuthal velocity, elevation, & elevation velocity dimensions. The apparatus includes a receiver and a processor arranged to generate photo events including target signal photo events and background photo events, transform the photo events into the 2-D target tracking array including range and range-rate parameters and tag photo events determined to be 2-D target signal photo events. The processor transforms tagged photo events into the 4-D target and tags photo events determined to be 4-D target signal photo events.
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