Patents by Inventor Rajesh Ramalingam Varadharajan
Rajesh Ramalingam Varadharajan 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: 11906626Abstract: Described herein are systems and methods that that mitigate avalanche photodiode (APD) blinding and allow for improved accuracy in the detection of a multi-return light signal. A blinding spot may occur due to saturation of a primary APD. The systems and methods include the incorporation of a redundant APD and the utilization of time diversity and space diversity. Detection by the APDs is activated by a bias signal. The redundant APD receives a time delayed bias signal compared to the primary APD. Additionally, the redundant APD is positioned off the main focal plane in order to attenuate an output of the redundant APD. With attenuation, the redundant APD may not saturate and may have a successful detection during the blinding spot of the primary APD. Embodiments may include multiple primary APDs and multiple secondary APDs.Type: GrantFiled: September 10, 2020Date of Patent: February 20, 2024Assignee: Velodyne Lidar USA, Inc.Inventors: Kiran Kumar Gunnam, Nitinkumar Sagarbhai Barot, Rajesh Ramalingam Varadharajan, Roger Jullian Pinto, Kanke Gao
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Patent number: 11774559Abstract: Described herein are systems and methods that create a capacitive link based on a rotating cylinder capacitor. A cylindrical rotor rotates around a shaft and maintains an air gap between the cylindrical rotor and the shaft and to create one or more air gap capacitors. A first subsystem, comprising a light detection and ranging components, is coupled to the rotor. A second sub-subsystem, comprising data analysis functions, is coupled to the shaft. The first subsystem and the second subsystem are coupled via capacitive links created by the air gap capacitors. The communication signaling utilized on the capacitive links may be bi-directional and differential signaling. The first subsystem and the second subsystem may comprise a LIDAR light detection and ranging system. The second subsystem may power the first subsystem via inductive coupling.Type: GrantFiled: January 24, 2022Date of Patent: October 3, 2023Assignee: Velodyne Lidar USA, Inc.Inventors: Pravin Kumar Venkatesan, Abhilash Goyal, William B. Etheridge, Rajesh Ramalingam Varadharajan
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Publication number: 20220146642Abstract: Described herein are systems and methods that create a capacitive link based on a rotating cylinder capacitor. A cylindrical rotor rotates around a shaft and maintains an air gap between the cylindrical rotor and the shaft and to create one or more air gap capacitors. A first subsystem, comprising a light detection and ranging components, is coupled to the rotor. A second sub-subsystem, comprising data analysis functions, is coupled to the shaft. The first subsystem and the second subsystem are coupled via capacitive links created by the air gap capacitors. The communication signaling utilized on the capacitive links may be bi-directional and differential signaling. The first subsystem and the second subsystem may comprise a LIDAR light detection and ranging system. The second subsystem may power the first subsystem via inductive coupling.Type: ApplicationFiled: January 24, 2022Publication date: May 12, 2022Inventors: Pravin Kumar Venkatesan, Abhilash Goyal, William B. Etheridge, Rajesh Ramalingam Varadharajan
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Patent number: 11231487Abstract: Described herein are systems and methods that create a capacitive link based on a rotating cylinder capacitor. A cylindrical rotor rotates around a shaft and maintains an air gap between the cylindrical rotor and the shaft and to create one or more air gap capacitors. A first subsystem, comprising a light detection and ranging components, is coupled to the rotor. A second sub-subsystem, comprising data analysis functions, is coupled to the shaft. The first subsystem and the second subsystem are coupled via capacitive links created by the air gap capacitors. The communication signaling utilized on the capacitive links may be bi-directional and differential signaling. The first subsystem and the second subsystem may comprise a LIDAR light detection and ranging system. The second subsystem may power the first subsystem via inductive coupling.Type: GrantFiled: January 6, 2020Date of Patent: January 25, 2022Assignee: VELODYNE LIDAR USA, INC.Inventors: Pravin Kumar Venkatesan, Abhilash Goyal, William B. Etheridge, Rajesh Ramalingam Varadharajan
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Publication number: 20210231809Abstract: Described herein are systems and methods that that mitigate avalanche photodiode (APD) blinding and allow for improved accuracy in the detection of a multi-return light signal. A blinding spot may occur due to saturation of a primary APD. The systems and methods include the incorporation of a redundant APD and the utilization of time diversity and space diversity. Detection by the APDs is activated by a bias signal. The redundant APD receives a time delayed bias signal compared to the primary APD. Additionally, the redundant APD is positioned off the main focal plane in order to attenuate an output of the redundant APD. With attenuation, the redundant APD may not saturate and may have a successful detection during the blinding spot of the primary APD. Embodiments may include multiple primary APDs and multiple secondary APDs.Type: ApplicationFiled: September 10, 2020Publication date: July 29, 2021Inventors: Kiran Kumar Gunnam, Nitinkumar Sagarbhai Barot, Rajesh Ramalingam Varadharajan, Roger Jullian Pinto, Kanke Gao
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Patent number: 10775486Abstract: Described herein are systems and methods that that mitigate avalanche photodiode (APD) blinding and allow for improved accuracy in the detection of a multi-return light signal. A blinding spot may occur due to saturation of a primary APD. The systems and methods include the incorporation of a redundant APD and the utilization of time diversity and space diversity. Detection by the APDs is activated by a bias signal. The redundant APD receives a time delayed bias signal compared to the primary APD. Additionally, the redundant APD is positioned off the main focal plane in order to attenuate an output of the redundant APD. With attenuation, the redundant APD may not saturate and may have a successful detection during the blinding spot of the primary APD. Embodiments may include multiple primary APDs and multiple secondary APDs.Type: GrantFiled: February 15, 2018Date of Patent: September 15, 2020Assignee: Velodyne LIDAR, Inc.Inventors: Kiran Kumar Gunnam, Nitinkumar Sagarbhai Barot, Rajesh Ramalingam Varadharajan, Roger Jullian Pinto, Kanke Gao
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Publication number: 20200144859Abstract: Described herein are systems and methods that create a capacitive link based on a rotating cylinder capacitor. A cylindrical rotor rotates around a shaft and maintains an air gap between the cylindrical rotor and the shaft and to create one or more air gap capacitors. A first subsystem, comprising a light detection and ranging components, is coupled to the rotor. A second sub-subsystem, comprising data analysis functions, is coupled to the shaft. The first subsystem and the second subsystem are coupled via capacitive links created by the air gap capacitors. The communication signaling utilized on the capacitive links may be bi-directional and differential signaling. The first subsystem and the second subsystem may comprise a LIDAR light detection and ranging system. The second subsystem may power the first subsystem via inductive coupling.Type: ApplicationFiled: January 6, 2020Publication date: May 7, 2020Applicant: VELODYNE LIDAR, INC.Inventors: Pravin Kumar Venkatesan, Abhilash Goyal, William B. Etheridge, Rajesh Ramalingam Varadharajan
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Publication number: 20200088844Abstract: Described herein are systems and methods for improving detection of a return signal in a light ranging and detection system (LiDAR). The method includes the following steps at the LiDAR system: encoding and transmitting a sequence of pulses based on a user signature. Then, receiving a multi-return signal based on a reflection off objects of the sequences of pulses. The multi-return signal may be decoded based on the user signature, and then authenticated the via a correlation calculation. The user signature may determine an amplitude of a first pulse in the sequence of pulses, an amplitude of a second pulse of the sequence of pulses, and an interval between the first pulse and the second pulse. A bit representation of the user signature is orthogonal to a bit representation of another user signature of another LiDAR system. The user signature may be dynamically adjusted by the LiDAR system.Type: ApplicationFiled: September 18, 2018Publication date: March 19, 2020Applicant: Velodyne LiDAR, Inc.Inventors: Kanke GAO, Kiran Kumar GUNNAM, Rajesh RAMALINGAM VARADHARAJAN, Anand GOPALAN, David HALL
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Patent number: 10530185Abstract: Described herein are systems and methods that create a capacitive link based on a rotating cylinder capacitor. A cylindrical rotor rotates around a shaft and maintains an air gap between the cylindrical rotor and the shaft and to create one or more air gap capacitors. A first subsystem, comprising a light detection and ranging components, is coupled to the rotor. A second sub-subsystem, comprising data analysis functions, is coupled to the shaft. The first subsystem and the second subsystem are coupled via capacitive links created by the air gap capacitors. The communication signaling utilized on the capacitive links may be bi-directional and differential signaling. The first subsystem and the second subsystem may comprise a LIDAR light detection and ranging system. The second subsystem may power the first subsystem via inductive coupling.Type: GrantFiled: February 15, 2018Date of Patent: January 7, 2020Assignee: Velodyne Lidar, Inc.Inventors: Pravin Kumar Venkatesan, Abhilash Goyal, William B Etheridge, Rajesh Ramalingam Varadharajan
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Publication number: 20190252916Abstract: Described herein are systems and methods that create a capacitive link based on a rotating cylinder capacitor. A cylindrical rotor rotates around a shaft and maintains an air gap between the cylindrical rotor and the shaft and to create one or more air gap capacitors. A first subsystem, comprising a light detection and ranging components, is coupled to the rotor. A second sub-subsystem, comprising data analysis functions, is coupled to the shaft. The first subsystem and the second subsystem are coupled via capacitive links created by the air gap capacitors. The communication signaling utilized on the capacitive links may be bi-directional and differential signaling. The first subsystem and the second subsystem may comprise a LIDAR light detection and ranging system. The second subsystem may power the first subsystem via inductive coupling.Type: ApplicationFiled: February 15, 2018Publication date: August 15, 2019Applicant: Velodyne LiDAR, Inc.Inventors: PRAVIN KUMAR VENKATESAN, ABHILASH GOYAL, WILLIAM B. ETHERIDGE, RAJESH RAMALINGAM VARADHARAJAN
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Publication number: 20190250256Abstract: Described herein are systems and methods that that mitigate avalanche photodiode (APD) blinding and allow for improved accuracy in the detection of a multi-return light signal. A blinding spot may occur due to saturation of a primary APD. The systems and methods include the incorporation of a redundant APD and the utilization of time diversity and space diversity. Detection by the APDs is activated by a bias signal. The redundant APD receives a time delayed bias signal compared to the primary APD. Additionally, the redundant APD is positioned off the main focal plane in order to attenuate an output of the redundant APD. With attenuation, the redundant APD may not saturate and may have a successful detection during the blinding spot of the primary APD. Embodiments may include multiple primary APDs and multiple secondary APDs.Type: ApplicationFiled: February 15, 2018Publication date: August 15, 2019Applicant: Velodyne LiDAR, Inc.Inventors: KIRAN KUMAR GUNNAM, NITINKUMAR SAGARBHAI BAROT, RAJESH RAMALINGAM VARADHARAJAN, ROGER JULLIAN PINTO, KANKE GAO