Patents by Inventor Michail K. Tsatsanis
Michail K. Tsatsanis has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11736063Abstract: Systems and methods are provided for compensating for mechanical acceleration at a reference oscillator. A reference oscillator provides an oscillator output signal and an accelerometer on a same platform as the reference oscillator, such that mechanical acceleration at the reference oscillator is detected at the accelerometer to produce a measured acceleration. A filter assembly, having an associated set of filter weights, receives the measured acceleration from the accelerometer and provides a tuning control signal responsive to the measured acceleration to a frequency reference associated with the system. An adaptive weighting component receives the oscillator output signal of the reference oscillator and an external signal that is provided from a source external to the platform and adjusts the set of filter weights for the filter assembly based on a comparison of the external signal and the oscillator output signal.Type: GrantFiled: March 24, 2022Date of Patent: August 22, 2023Assignee: VIASAT, INC.Inventors: Branislav A. Petrovic, Michail K. Tsatsanis
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Publication number: 20220216829Abstract: Systems and methods are provided for compensating for mechanical acceleration at a reference oscillator. A reference oscillator provides an oscillator output signal and an accelerometer on a same platform as the reference oscillator, such that mechanical acceleration at the reference oscillator is detected at the accelerometer to produce a measured acceleration. A filter assembly, having an associated set of filter weights, receives the measured acceleration from the accelerometer and provides a tuning control signal responsive to the measured acceleration to a frequency reference associated with the system. An adaptive weighting component receives the oscillator output signal of the reference oscillator and an external signal that is provided from a source external to the platform and adjusts the set of filter weights for the filter assembly based on a comparison of the external signal and the oscillator output signal.Type: ApplicationFiled: March 24, 2022Publication date: July 7, 2022Inventors: Branislav A. Petrovic, Michail K. Tsatsanis
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Patent number: 11323066Abstract: Systems and methods are provided for compensating for mechanical acceleration at a reference oscillator. A reference oscillator provides an oscillator output signal and an accelerometer on a same platform as the reference oscillator, such that mechanical acceleration at the reference oscillator is detected at the accelerometer to produce a measured acceleration. A filter assembly, having an associated set of filter weights, receives the measured acceleration from the accelerometer and provides a tuning control signal responsive to the measured acceleration to a frequency reference associated with the system. An adaptive weighting component receives the oscillator output signal of the reference oscillator and an external signal that is provided from a source external to the platform and adjusts the set of filter weights for the filter assembly based on a comparison of the external signal and the oscillator output signal.Type: GrantFiled: November 19, 2020Date of Patent: May 3, 2022Assignee: VIASAT, INC.Inventors: Branislav A. Petrovic, Michail K. Tsatsanis
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Publication number: 20210152122Abstract: Systems and methods are provided for compensating for mechanical acceleration at a reference oscillator. A reference oscillator provides an oscillator output signal and an accelerometer on a same platform as the reference oscillator, such that mechanical acceleration at the reference oscillator is detected at the accelerometer to produce a measured acceleration. A filter assembly, having an associated set of filter weights, receives the measured acceleration from the accelerometer and provides a tuning control signal responsive to the measured acceleration to a frequency reference associated with the system. An adaptive weighting component receives the oscillator output signal of the reference oscillator and an external signal that is provided from a source external to the platform and adjusts the set of filter weights for the filter assembly based on a comparison of the external signal and the oscillator output signal.Type: ApplicationFiled: November 19, 2020Publication date: May 20, 2021Inventors: BRANISLAV A. PETROVIC, MICHAIL K. TSATSANIS
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Patent number: 10886877Abstract: Systems and methods are provided for compensating for mechanical acceleration at a reference oscillator. A reference oscillator provides an oscillator output signal and an accelerometer on a same platform as the reference oscillator, such that mechanical acceleration at the reference oscillator is detected at the accelerometer to produce a measured acceleration. A filter assembly, having an associated set of filter weights, receives the measured acceleration from the accelerometer and provides a tuning control signal responsive to the measured acceleration to a frequency reference associated with the system. An adaptive weighting component receives the oscillator output signal of the reference oscillator and an external signal that is provided from a source external to the platform and adjusts the set of filter weights for the filter assembly based on a comparison of the external signal and the oscillator output signal.Type: GrantFiled: December 18, 2018Date of Patent: January 5, 2021Assignee: VIASAT, INC.Inventors: Branislav A. Petrovic, Michail K. Tsatsanis
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Patent number: 10871575Abstract: Systems and methods are described herein for multi-mode compensation of frequency errors within signals transmitted and received by a mobile terminal. The frequency error can be due to Doppler shift and oscillator error, which introduce opposite frequency shifts. In an acquisition mode, the mobile terminal initially compensates for the oscillator error while transmitting a signal to a communication system that contains the Doppler shift. Upon receiving a message from the communication system indicating the Doppler shift contained in the transmit signal, the mobile terminal can then switch to a tracking mode that can compensate for both Doppler shift and oscillator error.Type: GrantFiled: October 26, 2018Date of Patent: December 22, 2020Assignee: Viasat, Inc.Inventors: Branislav A Petrovic, Michail K Tsatsanis
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Publication number: 20200195196Abstract: Systems and methods are provided for compensating for mechanical acceleration at a reference oscillator. A reference oscillator provides an oscillator output signal and an accelerometer on a same platform as the reference oscillator, such that mechanical acceleration at the reference oscillator is detected at the accelerometer to produce a measured acceleration. A filter assembly, having an associated set of filter weights, receives the measured acceleration from the accelerometer and provides a tuning control signal responsive to the measured acceleration to a frequency reference associated with the system. An adaptive weighting component receives the oscillator output signal of the reference oscillator and an external signal that is provided from a source external to the platform and adjusts the set of filter weights for the filter assembly based on a comparison of the external signal and the oscillator output signal.Type: ApplicationFiled: December 18, 2018Publication date: June 18, 2020Inventors: BRANISLAV A. PETROVIC, MICHAIL K. TSATSANIS
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Publication number: 20200132859Abstract: Systems and methods are described herein for multi-mode compensation of frequency errors within signals transmitted and received by a mobile terminal. The frequency error can be due to Doppler shift and oscillator error, which introduce opposite frequency shifts. In an acquisition mode, the mobile terminal initially compensates for the oscillator error while transmitting a signal to a communication system that contains the Doppler shift. Upon receiving a message from the communication system indicating the Doppler shift contained in the transmit signal, the mobile terminal can then switch to a tracking mode that can compensate for both Doppler shift and oscillator error.Type: ApplicationFiled: October 26, 2018Publication date: April 30, 2020Applicant: VIASAT, INC.Inventors: BRANISLAV A PETROVIC, MICHAIL K TSATSANIS
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Patent number: 6445692Abstract: The present invention utilizes a filter that works on an algorithm that filters out multiuser and multi-path interference. The algorithm is programmed into the DSP processors of receiver handsets and base stations in cellular and multihop wireless radio networks which use the CDMA technology. It can also be implemented in hardware. Additionally, the invention works in a blind manner such that it learns without requiring training samples. The algorithm can be expressed as updating the receiver parameter vector f(n) as: f(n+1)=[I−C(CHC)−1CH][f(n)−mfy(n)yH(n)f(n)]+C(CHC)−1g(n) wherein y(n) is a data vector for each transmitted bit W1(n) from user 1, the receiver will estimate that bit by filtering y(n), i.e. w1(n)=fH(n)y(h), where H denotes Hermitian; g(n) corresponds to the multipath parameters and is updated by a separate revision; and C is a matrix constructed from elements of the desired user's spreading code.Type: GrantFiled: May 19, 1999Date of Patent: September 3, 2002Assignee: The Trustees of the Stevens Institute of TechnologyInventor: Michail K. Tsatsanis