31 results about "Radar tracker" patented technology

A head tracker system for determining a user's head orientation relative to a datum comprises: a head mounting, preferably a helmet (2), for attachment to the user's head and a sensor system (10,12) for sensing the orientation of the head mounting (2) relative and the datum. A distinguishable marking (26) is provided at a first known point fixed relative to the head mounting or a second known point fixed relative to the datum. At the other known point an optical sensor (18), preferably a video camera, is mounted. The system further comprises processing means (28) for determining when the marking is within the field of view of the optical sensor and the output of the processing means is used to correct for drift in the sensor system or to provide an independent verification that the system is functioning within preselected tolerances.

A radar transceiver of an on-vehicle radar transmits and receives a radar wave. Objects ahead of a vehicle having the on-vehicle radar are sensed based on the reflected radar wave reflected from the objects. A target vehicle to be monitored is extracted from the sensed objects based on the reflected radar wave. Also, a blind spot object, which is present in a blind spot of the target vehicle is extracted from the sensed objects based on the reflected radar wave.

The invention relates to the modification to the tracking method of the star tracker. The process includes: it gets the reference star map of the K+1 frame by the star mapping; the every star in the star map collected by the (K+1) frame is matched to the star in the reference star map of the K+1 frame; the character is to map the star by the threshold value mapping; while it searches the star by the zone catalogue; in the matching process, it arrays the sequence firstly then to match. The computing of the invention cost the short time, so it has the high speed.

The invention discloses an accuracy measurement system for a star sensor. The accuracy measurement system comprises a fixer and a star sensor accuracy measurement unit, wherein the fixer is used for fixing the star sensor to make a main shaft of the star sensor aligned with a zenith; the star sensor accuracy measurement unit is used for measuring the accuracy of a navigation star; a test startingmoment T is input into the star sensor; a direction vector under a J2000.0 rectangular coordinate system is determined according to declination, right ascension and apparent motion parameters of the navigation star under a J2000.0 coordinate system; the direction vector is converted into the direction vector under an epoch ecliptic coordinate system and then converted into a direction vector (VCRFT) under a celestial sphere coordinate system; the direction vector of the navigation star under the celestial sphere coordinate system is changed into a direction vector (VTRF) under an earth-fixed coordinate system; and based on the direction vector (VTRF) under the earth-fixed coordinate system, the accuracy of the star sensor is obtained. According to the accuracy measurement system provided by the invention, the star sensor is fixedly connected to the earth by using the accuracy of rotation of the earth, and the main shaft of the star sensor is aligned with the zenith for observation.

A method for the automatic correction of alignment errors in individual star trackers (R, S) of star tracker systems (1) is provided. The correction of orientation errors is necessary whenever it is not possible to mount the star trackers of the star tracker system on a shared stable block of a platform. Orientation errors can arise due to installation deviations and deformation of the platform, for instance, caused by mechanical loads or temperature fluctuations. A star tracker (R) that is attached in a very stable manner to the platform serves as the reference tracker. The orientation that it measures constitutes the reference information. An error signal and an orientation matrix are derived from the measured orientation of the other star trackers, thereby effectuating the correction of the coordinate systems of the star trackers that are to be corrected, and thus of their measured quantities. The resulting orientation as the starting quantity of the star tracker system is then calculated on the basis of the orientation information of the reference tracker and of the other star trackers. The linking of the measured results of the individual star trackers can take place on the level of the star vectors of a star catalog, on the level of preprocessed tracker signals or on the level of the quaternions and/or on the level Euler angles.

A star tracker determines a location or orientation of an object, such as a space vehicle, by observing unpolarized light from one or more stars or other relatively bright navigational marks, without imaging optics, pixelated imaging sensors or associated pixel readout electronics. An angle of incidence of the light is determined by comparing signals from two or more differently polarized optical sensors. The star tracker may be fabricated on a thin substrate. Some embodiments have vertical profiles of essentially just their optical sensors. Some embodiments include micro-baffles to limit field of view of the optical sensors.

The invention discloses an illumination-full-adaptation heat control device of a star tracker. The illumination-full-adaptation heat control device comprises F46 silver-plated second surface mirrors,a polyimide heat insulation pad, S781 white paint, an electric heater and a low-temperature multilayer assembly, wherein the F46 silver-plated second surface mirrors are attached to the outer surfaceof a baffle of the star tracker and the outer surface of a head of the star tracker except the outer surface with the back to the opening direction of the baffle; the polyimide heat insulation pad ismounted between the baffle of the star tracker and the head of the star tracker; the S781 white paint is sprayed on the outer surface of a support frame of the star tracker and used for providing a low-temperature mounting boundary for the head of the star tracker; the electric heater is attached to the outer surface, with the back to the opening direction of the baffle, of the head of the star tracker; and the low-temperature multilayer assembly is wrapped around the outer surface, with the back to the opening direction of the baffle, of the head of the star tracker. The illumination-full-adaptation heat control device of the star tracker is capable of solving the problem of on-orbit temperature control of the head of the star tracker and realizing full adaptation to illumination, and hasthe beneficial effects of high temperature-control capability, simple system, high reliability, high design adaptability and the like.

A panoramic image system with parallax mitigation includes image sensors, a head tracker, a display, and a processor. Each image sensor is fixedly mounted a predetermined linear distance from a first reference axis and is disposed adjacent to at least one other image sensor and to point in a direction that is offset from its adjacent image sensor by a predetermined angle. The head tracker is configured to sense at least the angular position and movement direction of a viewer's head about a second reference axis and to supply an azimuth position signal representative thereof. The display is configured to selectively display images sensed by each of the image sensors. The processor is in operable communication with the image sensors, head tracker, and display. The processor is configured, based at least on the azimuth position signal, to command the display to display images sensed by only one image sensor.

A traffic radar system comprises a first radar transceiver, a second radar transceiver, a speed determining element, and a processing element. The first radar transceiver transmits and receives radar beams and generates a first electronic signal corresponding to the received radar beam. The second radar transceiver transmits and receives radar beams and generates a second electronic signal corresponding to the received radar beam. The speed determining element determines and outputs a speed of the patrol vehicle. The processing element is configured to receive a plurality of digital data samples derived from the first or second electronic signals, receive the speed of the patrol vehicle, process the digital data samples to determine a relative speed of at least one target vehicle in the front zone or the rear zone, and convert the relative speed of the target vehicle to an absolute speed using the speed of the patrol vehicle.

The invention belongs to the field of radar technologies and relates to a radar data transmission device and a radar system. The transmission device comprises a radar transceiver and a data transmitter; the radar transceiver is used for generating frequency sweep signals, wherein the frequency sweep signals have pulse transmission intervals and waiting intervals in the time domain, wherein the waiting intervals are used for isolating adjacent pulse transmission intervals; the data transmitter is connected with the radar transceiver; the radar transceiver is used for providing clock signals tothe data transmitter in the waiting intervals; and the data transmitter performs serial transmission on radar data based on clock signals. With the radar data transmission device and the radar systemof the present invention adopted, the high-speed transmission of multi-channel data can be realized with no additional clock circuits required. The radar data transmission device has the advantages ofsimple structure and low cost.

The invention relates to an underwater intelligent robot radar obstacle avoidance system. The system comprises a robot body (1), wherein a top surface, a bottom surface, a left surface and a right surface of the robot body are respectively equipped with a radar transceiver (2), the robot body is internally provided with a single-chip microcomputer (3) and a peripheral circuit connected with the single-chip microcomputer, the single-chip microcomputer (3) is internally provided with a timer (4), radar signals are transmitted to each radar transceiver (2) by the single-chip microcomputer (3) in a time division one-to-one correspondence mode, feedback signals of an obstacle are respectively transmitted by the radar transceivers (2) to the single-chip microcomputer (3) in a one-to-one correspondence mode, the timer (4) starts when the radar signals are transmitted, the timer (4) stops when the feedback signals are transmitted, and distances between the obstacle (5) and the radar transceivers (2) can be calculated by the single-chip microcomputer (3) according to time difference between starting and stopping of the timer (4). The system is advantaged in that obstacle avoidance can be more reasonably and effectively carried out, moreover, miniaturization and light weight can be realized, and the system can be applied to micro underwater robots.

The invention belongs to the field of parallel robots; the structure is as follows: a moving platform is connected with a fixed platform through two ranches, an axis of a hooke joint in the two branches which is connected with a base. The mechanism has the advantages of simple structure, full decoupling of the two rotations of the moving platform, easy control, low movement quality and good dynamic performance, and can be widely applied to telescopes, cameras, solar panels, positioners, missile launchers, radar trackers, artillery and other aiming equipments.

A method for tracking the accumulated load and any load events that exceed a maximum threshold in a mobile farm implement. The mobile farm implement includes a plurality of load sensors which provide a weight of the material in a bin to an indicator, and a memory that stores the accumulated load and the highest load events.

The invention discloses a laser radar and navigation radar target fusion method. The method comprises the following steps: S1, converting three-dimensional point cloud data of a laser radar into two-dimensional image data; s2, according to the two-dimensional image data of the laser radar, extracting, tracking and track distribution of a laser radar target are carried out through a radar tracker; and S3, the track fusion engine obtains the laser radar target track output by the radar tracker, combines the navigation radar target track to carry out track fusion, and generates a fusion target and track information of the fusion target. According to the laser radar and navigation radar target fusion method provided by the invention, the point cloud data of the laser radar is converted into the three-dimensional target of the geographic space, the three-dimensional target is converted into the two-dimensional target, and fusion with the two-dimensional target detected by the navigation radar is realized through the fusion engine. And data support is provided for accurate detection and judgment of complex traffic states.

The invention relates to a radar type tilt switch, which comprises a cylinder, a mercury switch, a circuit board, a radar transceiver, a radar transceiver fixing bracket, a signal line, a protection plate and a suspension component. Compared with the prior art, the radar type tilt switch has the advantages of being capable of monitoring storing height; and through a reversing radar principle, the radar type tilt switch automatically resets when detecting that the material is close, so that the radar type tilt switch is prevented from being buried by the material.