Abstract: A method of calibrating a LiDAR sensor mounted on a vehicle includes positioning the vehicle at a distance from a target including a planar mirror and features surrounding the mirror. The vehicle is positioned and oriented relative to the mirror so that an optical axis of the LiDAR sensor is nominally parallel to the optical axis of the mirror, and the target is nominally centered at a field of view of the LiDAR sensor. The method further includes acquiring, using the LiDAR sensor, a three-dimensional image of the target including images of the features of the target and a mirror image of the vehicle formed by the mirror. The method further includes determining a deviation from an expected alignment of the LiDAR sensor with respect to the vehicle by analyzing the images of the features and the mirror image of the vehicle in the three-dimensional image of the target.

Abstract: A method of calibrating a LiDAR sensor mounted on a vehicle includes storing a reference three-dimensional image acquired by the LiDAR sensor while the LiDAR sensor is in an expected alignment with respect to the vehicle. The reference three-dimensional image includes a first image of a fixed feature on the vehicle. The method further includes, acquiring, using the LiDAR sensor, a three-dimensional image including a second image of the fixed feature, and determining a deviation from the expected alignment of the LiDAR sensor with respect to the vehicle by comparing the second image of the fixed feature in the three-dimensional image to the first image of the fixed feature in the reference three-dimensional image.

Abstract: A LiDAR system includes one or more light sources configured to emit a set of light pulses in a temporal sequence with randomized temporal spacings between adjacent light pulses, one or more detectors configured to receive a set of return light pulses, and a processor configured to: determine a time of flight for each return light pulse of the set of return light pulses; and obtain a point cloud based on the times of flight of the set of return light pulses. Each point corresponds to a respective return light pulse. The processor is further configured to, for each respective point of the set of points in the point cloud: analyze spatial and temporal relationships between the respective point and a set of neighboring points in the set of points; and evaluate a quality factor for the respective point based on the spatial and temporal relationships.

Abstract: A scanning lidar system includes a fixed frame, a first platform, and a first electro-optic assembly. The first electro-optic assembly includes a first laser source and a first photodetector mounted on the first platform. The scanning lidar system further includes a first flexure assembly flexibly coupling the first platform to the fixed frame, and a drive mechanism configured to scan the first platform with respect to the fixed frame in two dimensions in a plane substantially perpendicular to an optical axis of the lidar system. The scanning lidar system further includes a controller coupled to the drive mechanism. The controller is configured to cause the drive mechanism to scan the first platform in a first direction with a first frequency and in a second direction with a second frequency. The second frequency is similar but not identical to the first frequency.

Abstract: A light projection system includes a base, a lens, and a set of flexures flexibly attaching the lens to the base. The light projection system further includes a board fixedly attached to the base, and a light source mounted on the board and spaced apart from the lens along an optical axis of the lens. The light source is configured to emit a light beam to be projected by the lens toward a scene. The light projection system further includes a driving mechanism configured to scan the lens via the set of flexures in a plane substantially perpendicular to the optical axis of the lens, thereby scanning the light beam emitted by the light source over the scene.

Abstract: An imaging system includes a base, an imaging lens fixedly attached to the base, a board, a first set of flexures flexibly attaching the board to the base, and a detector mounted on the board and positioned at an image plane of the imaging lens. The imaging system further includes a driving mechanism configured to scan the board via the first set of flexures in a plane substantially perpendicular to an optical axis of the imaging lens, thereby scanning the detector to a plurality of image positions in the image plane. The imaging system further includes electronic circuitry configured to read out a respective electrical signal output by the detector as the detector is scanned to each respective image position of the plurality of image positions in the image plane, and generate an image based on the electrical signals read out from the detector at the plurality of image positions.

Abstract: A headlamp module of a vehicle includes a housing including a window, an illumination submodule disposed inside the housing and configured to provide illumination light to be transmitted through the window toward a scene in front of the vehicle, and a first LiDAR sensor disposed inside the housing and laterally displaced from the illumination submodule. The first LiDAR sensor includes one or more laser sources configured to emit laser beams to be transmitted through the window toward the scene, the laser beams being reflected off of one or more objects in the scene, thereby generating return laser beams to be transmitted through the window toward the first LiDAR sensor and one or more detectors configured to receive and detect the return laser beams.

Abstract: An optical system includes a laser source having an emission area that has a first width in a first direction and a first height in a second direction orthogonal to the first direction, the first width being greater than the first height. The optical system further includes a cylindrical lens having a negative power and positioned in front of the laser source. The cylindrical lens is oriented such that a power axis of the cylindrical lens is along the first direction. The cylindrical lens is configured to transform the emission area of a laser beam emitted by the laser source into a virtual emission area having a virtual width and a virtual height, where the virtual width is less than the first width. The optical system further includes an rotationally symmetric lens positioned downstream from the cylindrical lens and configured to collimate and direct the laser beam towards a far-field.

Abstract: A lidar system includes a laser source, an emission lens configured to collimate and direct a laser beam emitted by the laser source, a receiving lens configured to receive and focus a return laser beam reflected off of one or more objects to a return beam spot at a focal plane of the receiving lens, and a detector including a plurality of photo sensors arranged as an array at the focal plane of the receiving lens. Each photo sensor has a respective sensing area and is configured to receive and detect a respective portion of the return laser beam. The lidar system further includes a processor configured to determine a respective time of flight for each respective portion of the return laser beam, and construct a three-dimensional image of the one or more objects based on the respective time of flight for each respective portion of the return laser beam.

Abstract: A scanning lidar system includes a fixed frame, a first platform, and a first electro-optic assembly. The first electro-optic assembly includes a first laser source and a first photodetector mounted on the first platform. The scanning lidar system further includes a first flexure assembly flexibly coupling the first platform to the fixed frame, and a drive mechanism configured to scan the first platform with respect to the fixed frame in two dimensions in a plane substantially perpendicular to an optical axis of the lidar system. The scanning lidar system further includes a controller coupled to the drive mechanism. The controller is configured to cause the drive mechanism to scan the first platform in a first direction with a first frequency and in a second direction with a second frequency. The second frequency is similar but not identical to the first frequency.

Abstract: A digitally controlled oscillator (DCO) modulation apparatus and method provides a wideband phase-modulated signal output. An exemplary modulator circuit uses an oscillator in a phase-locked loop. The circuit receives a wrapped-phase input signal, unwraps the wrapped-phase input signal to generate an unwrapped-phase signal, and differentiates the unwrapped-phase signal. The wrapped-phase input signal and the differentiated unwrapped-phase signal are both injected into a feedback loop of the modulator circuit. The feedback loop may include a multi-modulus frequency divider with a frequency divisor that is temporarily incremented or decremented to cancel out abrupt phase jumps associated with the wrapped-phase to unwrapped-phase conversion.

Abstract: A digitally controlled oscillator (DCO) modulation apparatus and method provides a wideband phase-modulated signal output. An exemplary modulator circuit uses an oscillator in a phase-locked loop. The circuit receives a wrapped-phase input signal, unwraps the wrapped-phase input signal to generate an unwrapped-phase signal, and differentiates the unwrapped-phase signal. The wrapped-phase input signal and the differentiated unwrapped-phase signal are both injected into a feedback loop of the modulator circuit. The feedback loop may include a multi-modulus frequency divider with a frequency divisor that is temporarily incremented or decremented to cancel out abrupt phase jumps associated with the wrapped-phase to unwrapped-phase conversion.

Abstract: A digitally controlled oscillator (DCO) modulation apparatus and method provides a wideband phase-modulated signal output. An exemplary modulator circuit uses an oscillator in a phase-locked loop. The circuit receives a wrapped-phase input signal, unwraps the wrapped-phase input signal to generate an unwrapped-phase signal, and differentiates the unwrapped-phase signal. The wrapped-phase input signal and the differentiated unwrapped-phase signal are both injected into a feedback loop of the modulator circuit. The feedback loop may include a multi-modulus frequency divider with a frequency divisor that is temporarily incremented or decremented to cancel out abrupt phase jumps associated with the wrapped-phase to unwrapped-phase conversion.

Abstract: A digitally controlled oscillator (DCO) modulation apparatus and method provides a wideband phase-modulated signal output. An exemplary modulator circuit uses an oscillator in a phase-locked loop. The circuit receives a wrapped-phase input signal, unwraps the wrapped-phase input signal to generate an unwrapped-phase signal, and differentiates the unwrapped-phase signal. The wrapped-phase input signal and the differentiated unwrapped-phase signal are both injected into a feedback loop of the modulator circuit. The feedback loop may include a multi-modulus frequency divider with a frequency divisor that is temporarily incremented or decremented to cancel out abrupt phase jumps associated with the wrapped-phase to unwrapped-phase conversion.

Abstract: A digitally controlled oscillator (DCO) modulation apparatus and method provides a wideband phase-modulated signal output. An exemplary modulator circuit uses an oscillator in a phase-locked loop. The circuit receives a wrapped-phase input signal, unwraps the wrapped-phase input signal to generate an unwrapped-phase signal, and differentiates the unwrapped-phase signal. The wrapped-phase input signal and the differentiated unwrapped-phase signal are both injected into a feedback loop of the modulator circuit. The feedback loop may include a multi-modulus frequency divider with a frequency divisor that is temporarily incremented or decremented to cancel out abrupt phase jumps associated with the wrapped-phase to unwrapped-phase conversion.

Abstract: A method and system using a compressed display mode list is disclosed. In particular, the compressed display mode list includes a plurality of data representing the display modes. The data is formatted according to a plurality of compression format rules. The compression format rules reduce and minimize the size of the compressed display mode list. A driver controls a graphical processing unit that renders an image for displaying on a display device according to a selected display mode from the compressed display mode list. Moreover, a computer-readable medium can store the compressed display mode list.