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公开(公告)号：US11709234B2
公开(公告)日：2023-07-25
申请号：US16863744
申请日：2020-04-30
Applicant: RAYTHEON COMPANY
Inventor： Adam Hodge Greenberg
IPC: G01S7/484
CPC classification number: G01S7/484
Abstract: A lidar for generating a cyclically optimal Pulse Position Modulated (PPM) waveform includes: a memory for storing a list of prime numbers; a processor for obtaining a list of prime numbers up to a predetermined maximum code length; selecting a largest prime number p* that is less than or equal to a ratio of a timing system bandwidth to the predetermined pulse repetition frequency (PRF), from the list of the prime numbers; constructing a list of pulse indices, m=0: p*−1 for the cyclically optimal PPM waveform; calculating a list of pulse modulations, dJs=mod(m2, p*)−(p*−1)/2, wherein dJs are modulation values; calculating a list of nominal pulse timings T, as T=m×ceil(TPRI/Δj), where Δj is a predetermined modulation resolution, and TPRI is the reciprocal of the PRF; calculating pulse timings t0 of the cyclically optimal PPM waveform as t0=Δj×(T+dJs); and generating the cyclically optimal PPM waveform from the pulse timings t0.
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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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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：US12117558B2
公开(公告)日：2024-10-15
申请号：US17322629
申请日：2021-05-17
Applicant: RAYTHEON COMPANY
Inventor： Adam Hodge Greenberg
Abstract: A method for transforming data from the time domain to the frequency domain. The method including receiving time domain input data, the time domain input data being sparse and binary-valued, obtaining at least one time vector corresponding to times of non-zero entries in the time domain input data, obtaining a frequency vector corresponding to frequencies of interest, determining at least one matrix corresponding to the at least one time vector and the frequency vector, performing a Sparse Partial Fourier Transform (SPFT) computation using the at least one matrix, and providing frequency domain output data corresponding to the time domain input data.
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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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Patent Agency Ranking
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：US12153139B2
公开(公告)日：2024-11-26
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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公开(公告)号：US20240386073A1
公开(公告)日：2024-11-21
申请号：US18198645
申请日：2023-05-17
Applicant: Raytheon Company
Inventor： Adam Hodge Greenberg , Bradley A. Flanders
IPC: G06F17/18
Abstract: Embodiments regard feature fusion with uncertainty, such as for classification. A method includes altering, for each feature of features to be fused and based on a marginal uncertainty distribution corresponding to a feature of the features and the marginal uncertainty distribution accounting for uncertainty in measuring the feature, a marginal feature distribution of the feature resulting in respective marginal feature distributions that account for uncertainty, altering, based on a joint uncertainty covariance of the features, a joint feature covariance of the features resulting in a covariance that jointly accounts for feature covariance and uncertainty covariance, generating, based on the covariance that jointly accounts for feature covariance and uncertainty covariance and the respective marginal feature distributions that account for uncertainty, a joint density function that accounts for feature values and uncertainty, and classifying the features based on the joint density function that accounts for feature values and uncertainty.
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公开(公告)号：US11630206B2
公开(公告)日：2023-04-18
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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