74results about How to "Extended Tracking" patented technology

The invention provides a physical education teaching auxiliary system based on a motion identification technology and an implementation method of the physical education teaching auxiliary system. The system is applicable to a personal computer (PC) or an embedded host. The system comprises a movement data collection module, a movement data acquisition module, an identification and training module and a virtual teaching environment module. The device is characterized in that: a micro-inertia measurement unit and an inertia parameter extraction unit are arranged in the movement data collection module; and a movement information resolving unit transmits data which is output by the inertia parameter extraction unit to a multi-sensor data fusion unit for resolving. The movement situation of a target is reflected comprehensively in an inertia tracking mode and an optical tracking mode, so a tracking range is effectively expanded, measurement accuracy is improved, and the problems that the integral information of the target cannot be acquired in the inertia tracking mode, complicated movement identification cannot be performed and sensitivity is poor are solved. A brand new teaching mode is provided for physical education teaching, and a physical education teaching method is digitalized, multi-media and scientifically standardized.

The invention discloses a multi-laser-radar-based pedestrian target tracking method. The multi-laser-radar-based pedestrian target tracking method comprises the following steps that: a sensor network consisting of a plurality of single-line laser radars monitors a whole scene; at every sampling moment, the radars output footstep point distance data of pedestrians, and the data among different radars are unified at a coordinate system through system calibration; a footstep movement model of the pedestrians is built and pedestrian movement states are tracked through Kalman filtering so as to finally acquire a stable target trace and relevant statistical information. In the method, the laser radars are used as sensors, so that the defects of influence of illumination variance on an image sensor in the tracking method can be overcome and reliability is enhanced greatly; furthermore, the tracking range is wide, the algorithm speed is high, the number of tracked pedestrians is large, all movement modes of the pedestrians are compatible, such as standing, walking and jogging, and positions of the pedestrians can be detected effectively and movement traces of the pedestrians can be tracked in real time. The multi-laser-radar-based pedestrian target tracking method is applicable to occasions in which main movement targets are pedestrians.

The invention discloses a novel three-phase photovoltaic grid-connected inverter system, wherein the system can be combined to grid after outputting the direct current to different photovoltaic arrays to independently boost; the system has good compatibility to the accessed photovoltaic array; the system boosts the corresponding photovoltaic array respectively through the BOOST circuit and tracks and controls the maximum power point of the BOOST circuit through a controller, so that the tracking range of the maximum power point is enlarged, and the direct current side voltage and the inverter conversion efficiency are improved; the system can be combined and connected with different photovoltaic arrays to achieve combination to the grid through single inverter, so the novel three-phase photovoltaic grid-connected inverter system saves cost and improves the voltage of the grid-connected side, and meanwhile, meets different photovoltaic array combination ways and different environmental requirements and improves the light energy utilization rate and the system generating efficiency.

This invention refers to a frequency deviation compensation method for separating RAKE receiver, which contains making independent frequency compensation to Doppler shift in each RAKE signal, generating base band feedback control signal according to RAKE shift and making uniform frequency compensation to RF and IF. Said method can quick and accurately estimate the frequency shift of tracked route, speed up AFC convergence rate and greatly raise the tracking range of frequency shift variation.

The present invention relates to one kind of six-freedom visual tracking method and system based on microcomputerized parallel processing structure. The tracking process includes the following operation steps: 1) installing artificial marker onto the tracked target, 2) performing view field acquisition of the scene with the artificial marker with several video cameras to obtain the original image, 3) processing the obtained image in computer, and 4) completing the 3D reconstruction of the spatial position and direction of the artificial marker and outputting the reconstructed result via network communication equipment to various man-computer interaction system. The tracking system includes N microcomputers, N image acquiring systems, N network communication cards and one network exchanger. The method and system of the present invention can realize the precise location and tracking of spatial target and has less influence of electromagnetic interference and other advantages.

The invention provides an automatic monitoring method and system for open source component vulnerabilities. The automatic monitoring method comprises the following steps: scheduling crawlers to searchand capture data newly published by bug disclosure platforms at home and abroad; recording the grabbed data and updating the grabbed data to a local open source component vulnerability library; scheduling an open source component used by the fingerprint scanner detection system and service, recording a scanning result and updating the scanning result to an open source component database; matchingthe grabbed data with information in an open source component database to screen components with risks at present; and performing early warning on related responsible persons by a scheduling component vulnerability feedback recording mechanism. The automatic monitoring method can realize Automatic vulnerability early warning tracking and security construction, so that security personnel only needto pay attention to screened vulnerabilities related to products and companies. Therefore, the extra-large workload is saved, and the security vulnerability discovery and tracking efficiency is improved; the vulnerability tracking range is expanded; and the latest burst vulnerability can be responded within 24 hours, so that the company network security response timeliness is improved.

The invention provides a pressure wave signal generator and a real-time tracking and positioning method for a detector in a pipe. The pressure wave signal generator is arranged on a flange of the detector in the pipe, and the pressure wave signal generator generates signals when the pressure wave signal generator advances in the pipe along with the detector in the pipe; and the pressure wave signal generator comprises a power take-off gear, a supporting arm, a swinging arm, a first gear, a releaser, a spring, a movement pair, a screw rod, a reducer and a second gear. The method comprises the following steps that real-time pressure signals of the head end of the pipe and the tail end of the pipe are collected, and phase-space reconstruction is conducted; a pressure wave chaos state prediction model is constructed and trained, and a pressure wave chaos state real-time model and a pressure wave chaos state synchronous model are synchronously constructed; the arrival time of the pressure wave signals generated by the pressure wave signal generator to the head end of the pipe and the arrival time of the pressure wave signals generated by the pressure wave signal generator to the tail end of the pipe are detected; and the distance between the detector in the pipe and the tail end of the pipe is calculated. According to the pressure wave signal generator and the real-time tracking and positioning method for the detector in the pipe, real-time tracking and blockage positioning of the detector in the pipe are achieved, the tracking range is large, and the pressure wave signal generator and the real-time tracking and positioning method for the detector in the pipe are not limited by the buried depth of the pipe and the thickness of the pipe wall.

The embodiment of the invention provides a target tracking system, method and device based on a GPS and a dome camera. The system comprises a first camera and a second camera. The first camera obtainsGPS coordinates of the target in the process of tracking the target, and sends the GPS coordinates to the second camera; and the second camera adjusts the shooting angle of the second camera according to the GPS coordinates, and controls itself to track the target after detecting the target in a second monitoring image shot by the second camera. Visibly, in the scheme, if the target moves out ofthe monitoring range of the first camera, the second camera continues to track the target, i.e., the tracking range of the target is improved through the linkage of the plurality of cameras.

A method for extending a tracking range of a PLL includes the steps of: establishing an initial tracking window of the PLL, the tracking window having a first width associated therewith; and dynamically adjusting the tracking window of the PLL within an extended tracking range when a frequency of an input signal supplied to the PLL is outside of the tracking window, the extended tracking range having a second width associated therewith which is greater than the first width.

The present invention discloses a servo/manual control mixing-type three-degree-of-freedom light-small unmanned aerial vehicle remote sensing holder system. The system comprises two work modes of servo stabilization and manual control. The system comprises a structure system, a power system and a control system. The pedestal of the structure system is connected with an airplane through a vibration damper to isolated from the vibration of an aircraft wire; an orientation framework is supported by the pedestal to realize revolution in the range of +_130 degrees; a roll framework is supported by the orientation framework to realize revolution in the range of +_30 degrees; and a pitching framework is supported by the roll framework to realize revolution in the range of -90 to 30 degrees. The control system generates an instruction according to framework angular position and angular rate information provided by an attitude reference system, and the power system is configured to perform compensation of attitude errors and rate disturbance to realize stabilization of an imaging load visual axis and real-time tracking of an object; when a tracking angle is large, the manual remote operation is employed to realize large-angle rapid tracking; and the system is small in size, light in weight, fast in response and wide in tracking range, and can be suitable for systems with light and small unmanned aerial vehicle remote control, target tracking and monitoring, etc.

An apparatus and a method for achieving lock-in of a phase-locked loop (PLL) are disclosed. The PLL receives a reference clock and generates an output clock according to the reference clock. The method comprises: adjusting an oscillation frequency of a controlled oscillator of the PLL close to a desired frequency by counting the number of rising edges of a first clock in a number of a second clock cycles; aligning a rising edge of a third clock and a rising edge of a fourth clock by temporarily changing the oscillation frequency of the digitally controlled oscillator; and locking the phases of the third and fourth clocks by a phase detector of the PLL, wherein the first and the third clocks correspond to the output clock and the second and fourth clocks correspond to the reference clock.

An imaging device, an imaging method and a nonvolatile recording medium are provided. The imaging device includes an imaging unit having a pixel group two-dimensionally arranged vertically and horizontally, and configured to read pixel signals associated with generation of a frame image in units of lines by a rolling shutter system, and a drive unit configured to periodically switch, when a plurality of frame images are consecutively read from the imaging unit with a predetermined frame period in video recording, positions of a plurality of lines each of which is made a read object in each of the frame images in units of frames.

The invention relates to a tracking method and apparatus. The method comprises the steps of obtaining point cloud data of multiple moving points of a current frame; determining at least one moving target based on a clustering algorithm according to the point cloud data of the plurality of moving points of the current frame; associating the point cloud data of a plurality of moving points of the current frame with the moving target based on an adaptive association gate and a nearest neighbor data algorithm to obtain associated data; and obtaining a moving track of the moving target according tothe associated data, thereby realizing tracking of the moving target. On the basis of obtaining the point cloud data of the moving target through radar signal processing, the tracking range is expanded, the moving target is detected and tracked, and the trajectory information of the moving target is obtained, so that the accuracy of the tracking algorithm is improved.

The invention discloses an ultrasonic handle tuning method for a cataract ultrasonic emulsification instrument. In the tuning method, an ultrasonic handle in a cataract ultrasonic emulsification instrument is tuned through the amplitude frequency characteristics of a resonant network; the resonant network is composed of a first switching tube, a second switching tube, a not gate, an output transformer, a matching inductor and the ultrasonic handle; a CPU (Central Processing Unit) outputs a frequency signal to carry out frequency sweeping on the resonant network, the direct current power supply at both ends of the resonant network is monitored by an A/D (Analog to Digital) converter, and the frequency corresponding to the minimum voltage value of the direct current power supply is the initial resonant frequency output by the CPU; and in the working process of the ultrasonic handle, the minimum voltage value of the direct current power supply is tracked so as to track the resonant frequency of the ultrasonic handle. The invention also discloses a process for tracking the resonant frequency of the ultrasonic handle. The invention has the advantages of high anti-jamming capability, large tracking range and easy implementation.

The invention discloses a real-time positioning method and device, relates to the field of positioning, and aims at solving the problem that data refreshing rates cannot be ensured while tracking areas are expanded in the prior art. The method comprises the following steps of: S10, obtaining a first synchronous scanning signal, an X-direction scanning signal, a second synchronous scanning signal and a Y-direction scanning signal; S20, respectively obtaining image horizontal coordinate sets, in at least two emitters, of a receiver; S30, respectively obtaining image vertical coordinate sets, inthe at least two emitters, of the receiver; S40, determining a target image coordinate combination according to the image horizontal coordinate sets, the image vertical coordinate sets and a preset threshold value; and S50, obtaining a three-dimensional coordinate of the receiver according to the target image coordinate combination. The method and device can be used in the field of motion capture,surgical navigation and virtual reality needing accurate tracking and positioning.

The invention relates to a self-adaptive tracking probe applied to ultrasonic scanning detection on materials and structures. The probe comprises a guide plate, a fixing bolt, a guide plate fixing base, a guide sliding plate, a lower baffle, a fixing plate, a rotating seat fixing support plate, a tracking contact, an elastic pad, a spherical rotating seat, a rotating seat fixing base, a spherical rotating head, an energy converter connecting sleeve, an ultrasonic energy converter, a guide protecting sleeve and a rotating shaft. According to the self-adaptive tracking method, the probe is connected with an external scanning mechanism; the sound wave coupling contact of a front end of the ultrasonic energy converter with the lower end surface of the tracking contact is formed at the surface of a detected part; the probe is moved; and the tracking probe drives the ultrasonic energy converter and the surface of the detected part to be in the shape surface and position contact, so as to realize the self-adaptive tracking scanning of the ultrasonic energy converter to the shape surface of the detected part. By utilizing the self-adaptive tracking probe, the self-adaptive tracking capability and flexibility of the ultrasonic energy converter to a curved surface part of which the chord height of each meter is larger than 100mm can be greatly improved, and the tracking range of the ultrasonic energy converter is greatly enlarged.

The optical tracking device of the present invention is contemplated to obtain a large tracking range in an open loop configuration. The tracking device projects and scans two probe beams across a symmetric reference landmark that has at least two symmetric lines or axes. The two probe beams scan repeatedly and alternatively along two directions of which each is perpendicular to a symmetric line of the reference mark. For each scan, a substantially symmetric profile is generated in the scattered light as the beam scans across the boundary on each side of the symmetric reference. This symmetric profile in the scattered light is detected and used to determine the position of the related symmetric line. The position detection of the symmetric line is independent from the object's movement along the direction of the symmetric line. The scattered-light signal from the two probe beams is separated by synchronized detection in the time domain. This way, the two probe beams scan and sense the positions of two symmetric lines and then the crossing point between the two lines determines the lateral position of the object to be tracked. The two symmetric lines may or may not be perpendicular to each other. The range of this detection is substantially as large as the size of the reference landmark.

The invention provides a joint iterative carrier synchronization and demodulation method of an SCCPM system. The method comprises coded modulation, up-conversion, channel noise, down-conversion, carrier synchronization initialization, and joint iterative carrier synchronization and demodulation. The device involved in the invention comprises an SCCPM coded modulation module, an up-conversion module, a down-conversion module, a carrier synchronization initialization module and a joint iterative carrier synchronization and demodulation module. By adoption of the joint iterative carrier synchronization and demodulation method provided by the invention, the disadvantages of separate operation of carrier synchronization and demodulation in the traditional EM technology are overcome, the sensitivity of a logarithm posterior probability to carrier parameters is reduced, and the carrier tracking range is greatly improved; and meanwhile, the disadvantages of failure to track systems containingcarrier frequency offset in the prior art are also overcome, and systems containing carrier frequency offset and carrier phase offset can be tracked at the same time.

The present invention provides a synchronous scanning circuit system based on PLL and DDS, which comprises trigger laser and a lens. The trigger laser is divided into two paths by the lens, wherein the optical path of one path of trigger laser is provided with a synchronous scanning strip camera, and the optical path of the other path of trigger laser is provided with a photoelectric converter and a synchronous scanning circuit. A trigger signal is converted to an electric pulse signal through the photoelectric converter and enters the triggering input end of the synchronous scanning circuit. The synchronous scanning circuit based on the PLL and DDS according to the invention mainly settles the following problems in an analog oscillating circuit: complicated structure, low integration degree and narrow synchronous tracking range.