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公开(公告)号：US10581471B1
公开(公告)日：2020-03-03
申请号：US16173672
申请日：2018-10-29
Inventor： Jonathan P. Beaudeau , Prabahan Basu , David J. Couto , William D. Watson
Abstract: An electronic transmitter includes: a generator circuit to generate a baseband signal; a modulator circuit to modulate a carrier signal with the baseband signal; an emitter to emit the modulated signal at an intended recipient; and a distortion circuit to apply a final distortion to the baseband signal or the modulated signal. The final distortion is optimized to minimize the ability of unintended recipients to localize the emitter using correlation-based techniques, and to minimize any degradation to the data rate of the emitted signal at the intended recipient. In some cases, the transmitter is part of an electronic communication system that also includes a receiver at the intended recipient. The receiver is aware of the final distortion and includes a collector to collect the emitted signal, and a demodulator circuit to demodulate the collected signal using the final distortion to recover the baseband signal.
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公开(公告)号：US20210011156A1
公开(公告)日：2021-01-14
申请号：US16507832
申请日：2019-07-10
Inventor： Apurva N. Mody , David J. Couto , Prabahan Basu , Michael J. Shea
IPC: G01S17/10 , G01S7/52 , H04B10/556 , H04B1/69
Abstract: A multi-user system to simultaneously perform operations such as communication, RADAR, Light Detection and Ranging (LIDAR) and Relative Navigation (RELNAV). The techniques according to an embodiment includes generating a Fourier based orthogonal chirp sequence of length P, a prime number greater than the number of users targeted for communication. The orthogonal chirp sequence is based on an identifier, in the range of one to P−1, associated with one of the targeted users. The method further includes using the orthogonal chirp sequence to generate a spread user signal based on a message directed to the one targeted users. The method further includes generating a sequence of training pulses for insertion into the spread user signal to facilitate reception of the signal. The method further includes transmitting and receiving a reflection of the spread user signal from one of the targeted users, the reflection used to detect and range the user.
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Patent Agency Ranking
公开(公告)号：US10666475B2
公开(公告)日：2020-05-26
申请号：US16173796
申请日：2018-10-29
Inventor： William D. Watson , Prabahan Basu , Jonathan P. Beaudeau , David J. Couto
IPC: H04J13/10 , H04L27/227 , H04L27/20
Abstract: An electronic transmitter includes: a modulator to phase modulate a carrier signal with a baseband signal using a phase modulation sequence; and an emitter to emit the phase modulated signal. The phase modulated signal has poor autocorrelation, has a corresponding mismatched filter based on the phase modulation sequence, and is configured to demodulate into the baseband signal through poor cross-correlation with the mismatched filter. Sometimes, the transmitter is part of a sensing apparatus, where the emitter emits the phase modulated signal at a target and the emitted signal reflects off the target. The sensing apparatus includes a receiver that has a collector to collect the reflected signal, and a demodulator to demodulate the collected signal into the baseband signal through the poor cross-correlation with the mismatched filter. Sometimes, the transmitter is part of a communication system, where the emitter emits the phase modulated signal to an intended recipient.
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公开(公告)号：US11366227B2
公开(公告)日：2022-06-21
申请号：US16507832
申请日：2019-07-10
Inventor： Apurva N. Mody , David J. Couto , Prabahan Basu , Michael J. Shea
IPC: H04J13/00 , G01S17/26 , H04B10/556 , H04B1/69 , G01S7/52
Abstract: A multi-user system to simultaneously perform operations such as communication, RADAR, Light Detection and Ranging (LIDAR) and Relative Navigation (RELNAV). The techniques according to an embodiment includes generating a Fourier based orthogonal chirp sequence of length P, a prime number greater than the number of users targeted for communication. The orthogonal chirp sequence is based on an identifier, in the range of one to P−1, associated with one of the targeted users. The method further includes using the orthogonal chirp sequence to generate a spread user signal based on a message directed to the one targeted users. The method further includes generating a sequence of training pulses for insertion into the spread user signal to facilitate reception of the signal. The method further includes transmitting and receiving a reflection of the spread user signal from one of the targeted users, the reflection used to detect and range the user.
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公开(公告)号：US20200136870A1
公开(公告)日：2020-04-30
申请号：US16173796
申请日：2018-10-29
Inventor： William D. Watson , Prabahan Basu , Jonathan P. Beaudeau , David J. Couto
IPC: H04L27/227 , H04L27/20
Abstract: An electronic transmitter includes: a modulator to phase modulate a carrier signal with a baseband signal using a phase modulation sequence; and an emitter to emit the phase modulated signal. The phase modulated signal has poor autocorrelation, has a corresponding mismatched filter based on the phase modulation sequence, and is configured to demodulate into the baseband signal through poor cross-correlation with the mismatched filter. Sometimes, the transmitter is part of a sensing apparatus, where the emitter emits the phase modulated signal at a target and the emitted signal reflects off the target. The sensing apparatus includes a receiver that has a collector to collect the reflected signal, and a demodulator to demodulate the collected signal into the baseband signal through the poor cross-correlation with the mismatched filter. Sometimes, the transmitter is part of a communication system, where the emitter emits the phase modulated signal to an intended recipient.
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公开(公告)号：US11159939B2
公开(公告)日：2021-10-26
申请号：US16669822
申请日：2019-10-31
Inventor： Jonathan P. Beaudeau , Prabahan Basu
IPC: H04W12/00 , H04W12/033 , H04L27/20 , H04L1/00
Abstract: Techniques are disclosed for generating a featureless low-probability-of-intercept/low-probability-of-detection (LPI/LPD) waveform via a continuously variable symbol rate transmission. A continuous-phase-modulation (CPM) signal can be represented with a phase trellis. During each symbol duration, the trellis is traversed in either a positive or negative direction in a continuous fashion from the starting phase value to the end phase value. The rate at which the trellis is traversed is varied continuously as a time-varying function. The time-varying phase velocity function, or instantaneous symbol rate, is a type of spreading code or secret key shared between the transmitter and receiver. The disclosed techniques can be implemented with CPM compromising the constant-modulus property of CPM signals.
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公开(公告)号：US20210136568A1
公开(公告)日：2021-05-06
申请号：US16669822
申请日：2019-10-31
Inventor： Jonathan P. Beaudeau , Prabahan Basu
Abstract: Techniques are disclosed for generating a featureless low-probability-of-intercept/low-probability-of-detection (LPI/LPD) waveform via a continuously variable symbol rate transmission. A continuous-phase-modulation (CPM) signal can be represented with a phase trellis. During each symbol duration, the trellis is traversed in either a positive or negative direction in a continuous fashion from the starting phase value to the end phase value. The rate at which the trellis is traversed is varied continuously as a time-varying function. The time-varying phase velocity function, or instantaneous symbol rate, is a type of spreading code or secret key shared between the transmitter and receiver. The disclosed techniques can be implemented with CPM compromising the constant-modulus property of CPM signals.
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