Patents Assigned to Interstate Electronics Corporation
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Patent number: 11927678Abstract: Apparatus and methods provide anti-spoofing capability from a first global navigation satellite system (GNSS) receiver to a second GNSS receiver. These GNSS receivers can be, for example, global positioning satellite (GPS) receivers. Via an authentication technique, signals from authentic GNSS sources are distinguished from signals from spoofers. Timing information, such as numerically-controlled oscillator (NCO) settings, used for tracking authenticated signals are then used to generate replica GNSS signals, which are then provided to the second GNSS receiver. As a result, the second GNSS receiver can provide accurate positioning system information in the presence of GNSS spoofers.Type: GrantFiled: November 16, 2021Date of Patent: March 12, 2024Assignee: L3Harris Interstate Electronics CorporationInventors: Derek Michael Loomer Boyer, Steven B. Alexander, Richard F. Redhead
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Patent number: 11733389Abstract: Disclosed is a technique that can provide one or more countermeasures against spoofers. A beamformer can control an antenna pattern of a CRPA to generate a survey beam. The survey beam is swept across space to determine a characteristic signature based on carrier-to-noise ratios (C/No) for particular space vehicle signals. Matching C/No signatures can be used to identify the existence of spoofers and invoke a countermeasure, such as nulling.Type: GrantFiled: December 1, 2021Date of Patent: August 22, 2023Assignee: L3Harris Interstate Electronics CorporationInventors: Ivan L. Johnston, Gilberto Isaac Sada, Steven B. Alexander
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Patent number: 11693122Abstract: Disclosed is a technique that can provide one or more countermeasures against spoofers. A direction from which a spoofing attack occurs is identified. A beamformer can control an antenna pattern of a CRPA to null out signals from that direction, which can assist a GNSS receiver to avoid error induced by the spoofing attack. Further, after two or more observations, the location of the spoofer can be identified.Type: GrantFiled: March 2, 2021Date of Patent: July 4, 2023Assignee: L3Harris Interstate Electronics CorporationInventors: Steven B. Alexander, Gilberto Isaac Sada
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Patent number: 11675090Abstract: Apparatus and methods permit the use of a microelectromechanical systems (MEMS) oscillator in a satellite positioning system receiver, such as a Global Positioning System (GPS) receiver. Techniques to ameliorate jitter or phase noise disadvantages associated with MEMS oscillators are disclosed. For example, a receiver can use one or more of the following techniques: (a) use another source of information to retrieve ephemeris information, (2) perform advanced tight coupling, and/or (3) use a phase-locked loop to clean up the jitter or phase noise of the MEMS oscillator. With respect to advanced tight coupling, an advanced tight coupling processor can include nonlinear discriminators which transform I and Q data into linear residual measurements corrupted by unbiased, additive, and white noise. It also includes an amplitude estimator configured to operate in rapidly changing, high power noise; a measurement noise variance estimator; and a linear residual smoothing filter for input to the navigation filter.Type: GrantFiled: December 1, 2020Date of Patent: June 13, 2023Assignee: L3Harris Interstate Electronics CorporationInventors: David Duane Chapman, Steven B. Alexander
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Patent number: 11409003Abstract: Disclosed is a technique to estimate at least a portion of an attitude, such as an azimuth angle from true North, based on beam angles from a controlled reception pattern antenna (CRPA) to space vehicle locations. Other attitude information such as roll and/or pitch can also be estimated. The at least portion of the attitude can be provided with or without an additional sensor, such as a compass or magnetometer, an inertial measurement unit (IMU), or the like. An attitude estimate can be useful because oftentimes the attitude of an object can vary from its track or velocity direction.Type: GrantFiled: August 18, 2020Date of Patent: August 9, 2022Assignee: L3Harris Interstate Electronics CorporationInventor: Steven B. Alexander
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Patent number: 11287534Abstract: Apparatus and methods determine the rotational position of a spinning object. A satellite positioning system can be used to determine the spatial position of an object, which in turn can be used to guide the object. However, when the object is spinning, such as an artillery shell, then the rotational orientation should be known in order to properly actuate the control surfaces, such as fins, which will also be spinning.Type: GrantFiled: April 2, 2020Date of Patent: March 29, 2022Assignee: Interstate Electronics CorporationInventors: Steven B. Alexander, Richard Redhead
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Patent number: 11194053Abstract: Disclosed is a technique that can provide one or more countermeasures against spoofers. A beamformer can control an antenna pattern of a CRPA to generate a survey beam. The survey beam is swept across space to determine a characteristic signature based on carrier-to-noise ratios (C/No) for particular space vehicle signals. Matching C/No signatures can be used to identify the existence of spoofers and invoke a countermeasure, such as nulling.Type: GrantFiled: January 24, 2020Date of Patent: December 7, 2021Assignee: Interstate Electronics CorporationInventors: Ivan L. Johnston, Gilberto Isaac Sada, Steven B. Alexander
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Patent number: 11181646Abstract: Apparatus and methods provide anti-spoofing capability from a first global navigation satellite system (GNSS) receiver to a second GNSS receiver. These GNSS receivers can be, for example, global positioning satellite (GPS) receivers. Via an authentication technique, signals from authentic GNSS sources are distinguished from signals from spoofers. Timing information, such as numerically-controlled oscillator (NCO) settings, used for tracking authenticated signals are then used to generate replica GNSS signals, which are then provided to the second GNSS receiver. As a result, the second GNSS receiver can provide accurate positioning system information in the presence of GNSS spoofers.Type: GrantFiled: June 16, 2020Date of Patent: November 23, 2021Assignee: Interstate Electronics CorporationInventors: Derek Michael Loomer Boyer, Steven B. Alexander, Richard F. Redhead
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Patent number: 11101829Abstract: A radio receiver has a front end having a shared amplification path for both radio frequency signals and intermediate frequency signals. In one example, the shared amplification path can include a low noise amplifier and an attenuator. By amplifying both radio frequency (RF) signals and intermediate frequency (IF) signals with the same shared amplification path, gains in power efficiency, and reductions in cost and circuit size can be achieved.Type: GrantFiled: April 8, 2020Date of Patent: August 24, 2021Assignee: Interstate Electronics CorporationInventor: David Duane Chapman
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Patent number: 10948602Abstract: Disclosed is a technique that can provide one or more countermeasures against spoofers. A direction from which a spoofing attack occurs is identified. A beamformer can control an antenna pattern of a CRPA to null out signals from that direction, which can assist a GNSS receiver to avoid error induced by the spoofing attack. Further, after two or more observations, the location of the spoofer can be identified.Type: GrantFiled: July 9, 2018Date of Patent: March 16, 2021Assignee: Interstate Electronics CorporationInventors: Steven B. Alexander, Gilberto Isaac Sada
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Patent number: 10921464Abstract: Apparatus and methods determine the rotational position of a spinning object. A satellite positioning system can be used to determine the spatial position of an object, which in turn can be used to guide the object. An adaptive sideband filter is used to provide increased robustness against interference. However, when the object is spinning, such as an artillery shell, then the rotational orientation should be known in order to properly actuate the control surfaces, such as fins, which will also be spinning.Type: GrantFiled: June 15, 2020Date of Patent: February 16, 2021Assignee: Interstate Electronics CorporationInventors: Steven B. Alexander, Richard F. Redhead
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Patent number: 10866325Abstract: Apparatus and methods permit the use of a microelectromechanical systems (MEMS) oscillator in a satellite positioning system receiver, such as a Global Positioning System (GPS) receiver. Techniques to ameliorate jitter or phase noise disadvantages associated with MEMS oscillators are disclosed. For example, a receiver can use one or more of the following techniques: (a) use another source of information to retrieve ephemeris information, (2) perform advanced tight coupling, and/or (3) use a phase-locked loop to clean up the jitter or phase noise of the MEMS oscillator. With respect to advanced tight coupling, an advanced tight coupling processor can include nonlinear discriminators which transform I and Q data into linear residual measurements corrupted by unbiased, additive, and white noise. It also includes an amplitude estimator configured to operate in rapidly changing, high power noise; a measurement noise variance estimator; and a linear residual smoothing filter for input to the navigation filter.Type: GrantFiled: July 18, 2018Date of Patent: December 15, 2020Assignee: Interstate Electronics CorporationInventors: David Duane Chapman, Steven B. Alexander
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Patent number: 10768309Abstract: Disclosed is a technique to estimate at least a portion of an attitude, such as an azimuth angle from true North, based on beam angles from a controlled reception pattern antenna (CRPA) to space vehicle locations. Other attitude information such as roll and/or pitch can also be estimated. The at least portion of the attitude can be provided with or without an additional sensor, such as a compass or magnetometer, an inertial measurement unit (IMU), or the like. An attitude estimate can be useful because oftentimes the attitude of an object can vary from its track or velocity direction.Type: GrantFiled: July 9, 2018Date of Patent: September 8, 2020Assignee: Interstate Electronics CorporationInventor: Steven B. Alexander
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Patent number: 10725182Abstract: Apparatus and methods provide anti-spoofing capability from a first global navigation satellite system (GNSS) receiver to a second GNSS receiver. These GNSS receivers can be, for example, global positioning satellite (GPS) receivers. Via an authentication technique, signals from authentic GNSS sources are distinguished from signals from spoofers. Timing information, such as numerically-controlled oscillator (NCO) settings, used for tracking authenticated signals are then used to generate replica GNSS signals, which are then provided to the second GNSS receiver. As a result, the second GNSS receiver can provide accurate positioning system information in the presence of GNSS spoofers.Type: GrantFiled: January 4, 2018Date of Patent: July 28, 2020Assignee: Interstate Electronics CorporationInventors: Derek Michael Loomer Boyer, Steven B. Alexander, Richard F. Redhead
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Patent number: 10698119Abstract: Apparatus and methods determine the rotational position of a spinning object. A satellite positioning system can be used to determine the spatial position of an object, which in turn can be used to guide the object. An adaptive sideband filter is used to provide increased robustness against interference. However, when the object is spinning, such as an artillery shell, then the rotational orientation should be known in order to properly actuate the control surfaces, such as fins, which will also be spinning.Type: GrantFiled: May 17, 2018Date of Patent: June 30, 2020Assignee: Interstate Electronics CorporationInventors: Steven B. Alexander, Richard F. Redhead
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Patent number: 10637514Abstract: A radio receiver has a front end having a shared amplification path for both radio frequency signals and intermediate frequency signals. In one example, the shared amplification path can include a low noise amplifier and an attenuator. By amplifying both radio frequency (RF) signals and intermediate frequency (IF) signals with the same shared amplification path, gains in power efficiency, and reductions in cost and circuit size can be achieved.Type: GrantFiled: January 29, 2019Date of Patent: April 28, 2020Assignee: Interstate Electronics CorporationInventor: David Duane Chapman
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Patent number: 10620321Abstract: Apparatus and methods determine the rotational position of a spinning object. A satellite positioning system can be used to determine the spatial position of an object, which in turn can be used to guide the object. However, when the object is spinning, such as an artillery shell, then the rotational orientation should be known in order to properly actuate the control surfaces, such as fins, which will also be spinning.Type: GrantFiled: August 28, 2017Date of Patent: April 14, 2020Assignee: Interstate Electronics CorporationInventors: Steven B. Alexander, Richard Redhead
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Patent number: 10545246Abstract: Disclosed is a technique that can provide one or more countermeasures against spoofers. A beamformer can control an antenna pattern of a CRPA to generate a survey beam. The survey beam is swept across space to determine a characteristic signature based on carrier-to-noise ratios (C/No) for particular space vehicle signals. Matching C/No signatures can be used to identify the existence of spoofers and invoke a countermeasure, such as nulling.Type: GrantFiled: July 8, 2016Date of Patent: January 28, 2020Assignee: Interstate Electronics CorporationInventors: Ivan L. Johnston, Gilberto Isaac Sada, Steven B. Alexander
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Patent number: 10200068Abstract: A radio receiver has a front end having a shared amplification path for both radio frequency signals and intermediate frequency signals. In one example, the shared amplification path can include a low noise amplifier and an attenuator. By amplifying both radio frequency (RF) signals and intermediate frequency (IF) signals with the same shared amplification path, gains in power efficiency, and reductions in cost and circuit size can be achieved.Type: GrantFiled: April 23, 2018Date of Patent: February 5, 2019Assignee: Interstate Electronics CorporationInventor: David Duane Chapman
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Patent number: 10107919Abstract: Apparatus and methods permit the use of a microelectromechanical systems (MEMS) oscillator in a satellite positioning system receiver, such as a Global Positioning System (GPS) receiver. Techniques to ameliorate jitter or phase noise disadvantages associated with MEMS oscillators are disclosed. For example, a receiver can use one or more of the following techniques: (a) use another source of information to retrieve ephemeris information, (2) perform advanced tight coupling, and/or (3) use a phase-locked loop to clean up the jitter or phase noise of the MEMS oscillator. With respect to advanced tight coupling, an advanced tight coupling processor can include nonlinear discriminators which transform I and Q data into linear residual measurements corrupted by unbiased, additive, and white noise. It also includes an amplitude estimator configured to operate in rapidly changing, high power noise; a measurement noise variance estimator; and a linear residual smoothing filter for input to the navigation filter.Type: GrantFiled: March 1, 2016Date of Patent: October 23, 2018Assignee: Interstate Electronics CorporationInventors: David Duane Chapman, Steven B. Alexander