Devices, methods, and computer program products for measuring the speed of an object. A speed measuring device includes a rangefinder module configured to measure distances from the device to a target object. Activating the device causes the device to measure a first distance from the device to the object along a first line-of-sight, and a second distance from the device to the object along a second line-of-sight. The device determines an angular displacement between the first line-of-sight and the second line-of-sight, and one or more of an elapsed time between measuring the first distance and measuring the second distance and a radial velocity of the object. The device then determines the absolute speed of the object based on the first distance, the second distance, the angular displacement, and one or more of the elapsed time and radial velocity.

In order to continuously acquire positional information of a moving body without losing sight of a target provided to the moving body, a moving body control system 1 a includes a moving body 100a with a target 100a, a positional information transmission apparatus 200 transmitting positional information of the target 100a on the basis of tracking the target 100a, a collimation possibility determining unit 109 determining, on the basis of an inclination of the moving body 100 predicted depending on a movement control instruction for moving the moving body 100, whether or not an incident angle at which a straight line connecting the positional information transmission apparatus 200 and the target 100a enters the target 100a falls within a prescribed range, and a control instruction changing unit 111 changing the movement control instruction based on the result of the determination.

In order to continuously acquire positional information of a moving body without losing sight of a target provided to the moving body, a moving body control system 1 a includes a moving body 100a with a target 100a, a positional information transmission apparatus 200 transmitting positional information of the target 100a on the basis of tracking the target 100a, a collimation possibility determining unit 109 determining, on the basis of an inclination of the moving body 100 predicted depending on a movement control instruction for moving the moving body 100, whether or not an incident angle at which a straight line connecting the positional information transmission apparatus 200 and the target 100a enters the target 100a falls within a prescribed range, and a control instruction changing unit 111 changing the movement control instruction based on the result of the determination.

A system for identifying a location of one or more assets in a predefined two-dimensional area comprises at least three tracking stations and one or more tracking tags. Each tracking station selectively emits a vertical laser line upon which is embedded a unique identifier, selectively sweeps its laser line about its central axis such that each tracking station's laser line sweeps across at least a portion of the predefined 2-D area, and selectively transmits a current angle of its laser line as its laser line sweeps about its central axis. Each tracking tag detects a laser line from at least three tracking stations within its line of sight. Each tracking tag decodes the unique tracking station identifier, receives the current angle from the tracking station corresponding to the detected laser line, and stores the decoded unique tracking station identifier and the received current angle.

A system for identifying a location of one or more assets in a predefined two-dimensional area comprises at least three tracking stations and one or more tracking tags. Each tracking station selectively emits a vertical laser line upon which is embedded a unique identifier, selectively sweeps its laser line about its central axis such that each tracking station's laser line sweeps across at least a portion of the predefined 2-D area, and selectively transmits a current angle of its laser line as its laser line sweeps about its central axis. Each tracking tag detects a laser line from at least three tracking stations within its line of sight. Each tracking tag decodes the unique tracking station identifier, receives the current angle from the tracking station corresponding to the detected laser line, and stores the decoded unique tracking station identifier and the received current angle.

Examples relate to a method for determining distance information of an object using a Time of Flight (ToF) system and to a ToF system. The method includes emitting modulated light towards the object using a light source. The method includes measuring a reflection of the modulated light using a ToF sensor module. The reflection of the modulated light is generated by successive reflections of the modulated light by the object and by an additional reflective surface. The method includes determining the distance information of the object based on the measured reflection of the modulated light.

A position determination device, including a main body, a first laser emitter disposed on at least a portion of the main body to emit a first laser beam pointing in a first direction, a second laser emitter hingedly disposed on at least a portion of the main body to emit a second laser beam pointing in the first direction, such that the first laser emitter and the second laser emitter determine at least one of a size of a conduit, an angle to install the conduit, a distance of the first laser emitter to a wall, and a distance of the second laser emitter to the wall, and a conduit attachment unit removably connected to at least a portion of the main body to connect the main body to the conduit.

An optical system with an entrance pupil, has a first aperture diameter, an exit pupil and a reflective or transmissive filter element spaced at a distance from the entrance pupil, which is designed and arranged such that a second diameter is illuminated on the filter element by a beam passing through the entrance pupil and spreading divergently from this. The second diameter corresponds to n times the first aperture diameter, and n is a number greater than 1, as a result of which the local angular spectrum at each point on the filter element is n times smaller in comparison to the entrance pupil. The filter element selectively reflects or transmits to the exit pupil at each point only a predetermined spectral range. An optical imaging unit comprising the filter element is provided, which images the entrance pupil onto the exit pupil.

The techniques disclosed herein detect sensor misalignments in a display device by the use of sensors operating under different modalities. In some configurations, a near-to-eye display device can include a number of sensors that can be used to track movement of the device relative to a surrounding environment. The device can utilize multiple sensors operating under multiple modalities. For each sensor, there is a set of intrinsic and extrinsic properties that are calibrated. The device is also configured to determine refined estimations of the intrinsic and extrinsic properties at runtime. The refined estimations of the intrinsic and extrinsic properties can then be used to derive knowledge on how the device has deformed over time. The device can then use the refined estimations of the intrinsic and extrinsic properties and/or any other resulting data that quantifies any deformations of the device to make adjustments to rendered images at runtime.

Disclosed herein are systems and methods for linearizing frequency chirp in a frequency-modulated continuous wave (FMCW) coherent LiDAR system. Exemplary methods can include generating a continuous wave laser signal having a frequency characteristic, in which the frequency characteristic can include a frequency chirp over a frequency band in at least one period; and receiving a signal based on the generated laser signal. The methods can further include mixing the received signal with a local oscillator signal, the local oscillator signal having the frequency characteristic; determining at least one beat frequency based on the mixed signal; sampling the mixed signal at a rate equal to at least two times the beat frequency; determining a correction signal based on the sampled signal; and applying the correction signal to the laser signal.