87results about How to "Improve capture accuracy" patented technology

Since a conventional pollen sensor performs detection in an optical manner, there has been a problem that long time is required for the measurement. Further, it has also been a problem that a light source or a detector is required to be used, and the device has become larger. Correspondingly, it is an object to provide a compact sensor with which particles floating in the air can be easily detected. A sensor having a microstructure which detects a detection object by contact is used. A microstructure has an opening to be a detection hole corresponding to the size of a detection object, and a pair of electrodes having a bridge structure are provided thereabove or thereunder so as to partially contact with each other.

The invention provides an active protection system and a method thereof for preventing secondary damage of pedestrians, belongs to the technical field of automobiles and solves the problem that pedestrians are not efficiently protected when vehicles and pedestrians collide in the prior art. The active protection system comprises a vehicular control unit, a collision sensor, an automobile forward sensor, a pedestrian protection air bag device and a capture device. The method includes steps of A, detecting collision acceleration of the collision sensor, and detecting property and prior-collision motion states of an object to be collided by the automobile forward sensor; B, controlling the pedestrian protection air bag device to inflate and unfold an air bag when collision intensity exceeds the threshold; C, predicting flight path of the object according to the collision strength and the collision position, so as to correspondingly simulate moving track parameters of a current capture net and controlling the capture device to capture and wrap the object according to the moving track parameters of the current capture net. By the active protection system and the method thereof, secondary damage to the pedestrians can be effectively prevented, and safety of the pedestrians is protected to the greatest extent.

The invention discloses a compressed sensing-based multi-period direct-spread MSK signal two-dimensional joint acquisition method. According to the method, A/D sampling is performed on received intermediate-frequency direct-spread signals; after passing through a receiving and converting filter, sampled signals are converted into approximate direct-spread BPSK signals; the approximate direct-spread BPSK signals are subjected to down-conversion and low-pass filtering, so that direct-spread DSSH complex baseband signals are obtained; a sample point sequence of M symbol periods is selected from the signals so as to be adopted as an observation sequence, and local pseudo-codes are adopted to construct a joint sparse matrix; and an orthogonal matching pursuit algorithm is used to reconstruct compressed sensing signals, so that pseudo-code phase difference and Doppler frequency offset can be captured. The method of the invention has the advantages of simultaneous completion of pseudo code phase and Doppler frequency offset capture, large search range, high estimation precision, small error, and the like. The method of the invention is a novel two-dimensional capture method, is suitable for a high-dynamic low-signal to noise ratio application environment and has a high practical value.

The invention provides a non-ambiguity capturing method and device applicable to BOC (n, n) signals which comprises the following steps of: acquiring a digital intermediate frequency signal, mixing the digital intermediate frequency signal with a local carrier to obtain a spread spectrum signal; and performing a low-pass filter on the spread spectrum signal; extracting sampling into a segmented matched filter, wherein both the local code and the spread spectrum signal are divided into a plurality of segments, and the corresponding segment number is multiplied by two times to obtain a pluralityof points, and finally the accumulated value of the cached suitable points is FFT; comparing the obtained maximum value with the threshold, if it is greater than the threshold value, indicating thatthe signal acquisition is successful, entering into the next step of tracking; if it is less than the threshold,, indicating that the signal acquisition is not successful, feedback to extract again, and the mobile code phase is subjected to one-step serial matched filtering plus FFT operation until the acquisition is successful. The invention solves the problem that the self-correlation function of the binary offset carrier modulation technique in the prior art with a plurality of sub-peaks which in turn leads to ambiguity in signal acquisition.

The invention provides an air target quick capturing method of monopulse radar. By means of the method, a target searching and capturing capability of the radar can be remarkably improved on conditions of low signal-to-noise ratio and high-speed target movement, thereby realizing quick target capturing. The air target quick capturing method is realized through a technical solution which is characterized in that DSP embedded software is composed of a three-channel constant false-alarm rate detecting module, a wave beam direction adjusting module, a target parameter estimating module, a sequence position correlation module and a slide window accumulation confirmation module, wherein the method comprises the steps of inputting summation, direction difference and pitch difference three-channel distance images, performing constant false-alarm rate determination on the three-channel distance images, thereby obtaining a target signal with a highest amplitude; then changing elapse main triggering time, and adjusting the wave beam according to a designed strategy; performing target parameter estimation by means of a phase and a difference type monopulse measured angle; determining a fact that target correlation successes or fails by means of sequence position correlation; performing sliding window type accumulation on the correlation result, determining the accumulation result, and outputting the target information which is successively captured through the monopulse radar.

The invention discloses a carrier capturing method in a large dynamic range. The method is used for capturing uplink carrier signals on a spacecraft. The method comprises the following steps of: carrying out down conversion on received uplink carrier signals by using local carrier at a fixed frequency interval; filtering to obtain intermediate-frequency signals after down conversion; extracting the intermediate-frequency signals by using three sampling frequencies to obtain a high-speed extraction signal, an intermediate-speed extraction signal and a low-speed extraction signal; judging the peak values of the high-speed extraction signal, the intermediate-speed extraction signal and the low-speed extraction signal respectively, capturing the uplink carrier signals, and carrying out capture confirmation on the captured uplink carrier signals to obtain confirmed uplink carrier signals; and acquiring and outputting the carrier frequency and carrier power of the confirmed uplink carrier signals. By the method, single carrier can be captured at extremely low signal-to-noise ratio, and large frequency change range and high frequency change rate are adapted.

An optical scanner includes a CCD and a light monitor window (“LMW”) and a black region adjacent the LMW. The LMW is imaged to provide feedback signals for Red, Green and Blue channels of the CCD. The black region is imaged to remove flare from the feedback signals. The flare-corrected feedback signals may be supplied to gain compensation controls.

The invention relates to a table look-up method-based Beidou signal high-precision capturing method and belongs to the technical field of satellite navigation. The method comprises the following steps that: step 1, satellite signal pseudo codes are stripped; step 2, FFT is performed on the signals; step 3, a threshold value is set; step 4, an FFT output main peak value is compared with the threshold value, and if the FFT output main peak value is higher than the threshold value, capture is successful, and captured Doppler frequency shift is fd; step 5, an FFT output secondary peak value is compared with the threshold value, and if the FFT output secondary peak value is higher than the threshold value and is adjacent to a main peak position, Doppler frequency shift can be corrected, otherwise, fd is taken as a capture result; step 6, table look-up is performed with the ratio of an FFT output main peak to an FFT output secondary peak adopted as an address, so that a correction value fx is obtained; and step 7, a position relation between the main peak and the secondary peak is judged, if the secondary peak is on the left side of the main peak, corrected Doppler frequency shift is fd-fx, otherwise, the corrected Doppler frequency shift is fd+fx. The method is applied to a Deidou signal software receiver and can effectively improve the capture precision of the Doppler frequency shift under the condition that computational load is almost not increased.

The invention relates to a capture method and system for train virtual transponders. The method for the train virtual transponder comprises the steps that the running direction of a train is determined, the capture zones of the virtual transponders on a train running rout are determined, and the capture state of the current virtual transponders is judged; if the current virtual transponder is in the capture missing state, the first calculation capture time is calculated according to the train current positioning time and the train running state, and the first calculation capture time is the capture time of the current virtual transponders. According to the capture method and system, the virtual transponder in the capture missing state is recorded, the capture time of the virtual transponder in the capture missing state is reckoned through the train positioning position and the virtual transponders in the capture state, the capture accuracy and the capture probability of the virtual transponders on the train running rout are improved, and it is ensured that the train runs safely and reliably.

The invention provides an L1C/A and L1C combined capturing method and device of a PGS. The method comprises that 1) digital intermediate-frequency L1C/A+L1C signals in discrete time are obtained, andin-phase I and quadrature Q paths of signals are obtained; 2) a local L1C/A code sequence is divided into an odd unit signal C<L1_0> and an even unit signal C<L1_E>, and a local L1C sequence is divided into an odd unit signal C<L1C_0> and an even unit signal C<L1C_E>; 3) a module is picked up from a carrier wave removed complex signal I+jQ, and multiplied with the unit signals C<L1_0> and C<L1C_0>, and S<L1_0><-> and S<L1C_0> <-> are obtained respectively by integration; 4) S<L1_OE><-> is obtained by lagging S<L1C_0> <-> for Tc/2 sampling points, and S<L1C_OE><-> is obtained by lagging S<L1C_0> <-> for Tc/2 sampling points and negating; 5) the integration results S<L1_0><-> is multiplied with S<L1_OE><-> and the integration results S<L1C_0> <-> is multiplied with the S<L1C_OE><-> to obtaindetection quantities S<L1> and S<L1C> with wings respectively; 6) an unambiguous detection quantity Sc is obtained according to the reconstruction rule Sc equals the square of an absolute value of the product of the absolute value of S<L1> and (S<L1C>+the absolute value of (S<L1C>); and 7) the detection quantity SC is compared with a detection threshold set by a decision device, if the detectionvalue exceeds the detection threshold, it is determined that the signal is captured accurately, and otherwise, it is determined that the signal is not captured accurately, and the steps 1) to 7) are repeated.

The invention relates to an aerial anti-UAV (unmanned aerial vehicle) net fishing device. The aerial anti-UAV net fishing device comprises a head cabin segment, a net cabin segment, an umbrella cabinsegment, a boosting segment and a control surface segment which are sequentially arranged from the head to the tail, wherein the head cabin segment comprises a head hoop (1), a delay igniter (6), gunpowder (7), a mass block (8) and a body (2), and the net cabin segment comprises a net box (9) and a flying net (3), the umbrella cabin segment comprises a dummy plate (4), an umbrella box (10) and a recovery parachute (5). The aerial anti-UAV net fishing device realizes capture and recycle for UAVs, leaves out a hauling mechanism of the recovery parachute by designing the recovery parachute at therear end of the flying net and hauling out the recovery parachute through the flying net, and meanwhile realizes recycle of the net fishing device. The net fishing device is compact in structure andlow in weight, and is launched through an aerial platform, thereby being wide in capture range, long in intercept distance, and high in capture accuracy.

The invention discloses a coordinate capturing and correcting algorithm of an infrared multipoint touch screen. Emitting lamps and receiving lamps are distributed at the periphery of the touch screen; when a touch point appears, the coordinate of the touch point is obtained by the signal change of the receiving lamps; each receiving lamp is provided with receiving lays of multiple directions; in such a way, for the touch point, math linear equations brought by multiple lays exist, a least square method is used, the optimal solution of a coordinate value can be obtained, and the error of the coordinate value is smallest. After the coordinate is obtained more than once, especially for the constantly changing coordinate, a cubic spline interpolation method is used, and the aims of predicting the coordinate value and correcting the original measuring coordinate value are achieved.

The invention provides a quenching metal strip coiling device which comprises a shell, wherein the shell can continuously rotate along the axial direction, and an air exhaust channel is formed on the shell so as to form a negative pressure environment on the shell. The quenching metal strip coiling device is characterized in that a first groove is arranged on the shell along the circumferential direction of the shell; the width of the bottom of the first groove is greater than or equal to that of a quenching metal strip; the width of the first groove is gradually increased from the bottom of the first groove to the open end of the first groove; and a cavity containing a magnetic inner core is arranged in the shell. The quenching metal strip coiling device provided by the invention can effectively avoid the strip distortion, and has a relatively high capturing success rate at the same time.

The invention relates to a light supplement lamp control method, monitoring equipment, an electronic device and a storage medium, and the light supplement lamp control method comprises the steps: obtaining an invisible light image of a panoramic camera; performing target identification on the invisible light image; under the condition that a target of interest exists in the invisible light image,controlling a detail camera to be positioned at the target of interest; evaluating the monitoring image brightness of the detail camera, controlling a light supplementing lamp to be turned on under the condition that the monitoring image brightness is smaller than a preset brightness threshold value, and controlling the detail camera to capture a snapshot image of the target of interest. Accordingto the application, the problem that the operation of turning on the light cannot be triggered due to the fact that the image quality of the panoramic camera is poor and a microprocessor cannot identify a moving target in the image in an over-dark environment is solved, and the snapshot accuracy in the over-dark environment is improved.

The invention discloses an automatic welding machine based on machine vision. The automatic welding machine comprises a welding current control module, a welding speed control module, a welding gun height control module, a welding seam image acquisition module, a welding seam image analysis module and a welding machine control module, wherein the welding current control module is used for controlling welding current; the welding speed control module is used for controlling the welding speed; the welding gun height control module is used for controlling the length of a welding arc; the welding seam image acquisition module is used for shooting a welding seam image; the welding seam image storage module is used for pre-storing a standard welding seam image and storing the image shot by the welding seam image acquisition module; the welding seam image analysis module is used for analyzing the welding seam image shot by the welding seam image acquisition module; and the welding machine control module is in communication connection with the welding current control module, the welding speed control module and the welding gun height control module and is used for controlling welding parameters according to the analysis result of the welding seam image analysis module. The defects in the prior art can be overcome, and the welding seam quality detection speed is increased.

The invention discloses an installation platform for a sheet light source emitter in a small wind tunnel PIV measurement system and a using method of the installation platform. The installation platform comprises a bottom installation platform, a leading screw motion system, a telescopic bending type support system and a hollow rotating installation system; the laser sheet light source emitter isfixedly mounted on a hollow rotation platform, and moves in a 3D space via the hollow rotation platform, the telescopic bending type support system and the bottom leading screw motion system. Thus, the laser sheet light source emitter is fixedly mounted, rotates and moves during a PIV experiment so that the sheet light source is arranged at any angle vertical to the bottom surface and two side surfaces of a wind tunnel, a developing paper arrangement platform is arranged to obtain an optimal irradiation distance of the sheet light source in a to-be-measured object, and thus, flow field data indifferent measurement planes can be collected accurately during small wind tunnel PIV test. The device can be suitable for PIV measurement experiments with different measurement plane requirements.

The invention discloses a highway vehicle overspeed capturing system, which belongs to the technical field of intelligent traffic vehicle capturing systems. The system of the invention comprises a traffic monitoring terminal, a coordinator, a router and ZigBee wireless network nodes, wherein the ZigBee wireless network nodes are equidistantly arranged on the highway; each ZigBee wireless network node comprises a ZigBee module, a vehicle speed detection unit, a control unit and an image acquisition unit; the image acquisition unit comprises an image capturing module, an image transmission module and an image storage module; the image transmission module comprises a first convex lens with a focal length to be f1, a second concavoconcave lens with a focal length to be f2 and a third convex lens with a focal length to be f3; the ratio of f1 to f2 is -0.2 to -1.45; the ratio of f1 to f3 is 0.5 to 1.3; and the distance d1 between the first convex lens and the second concavoconcave lens is 2 to 7.5 mm. 24-hour automatic real-time monitoring can be carried out on the highway, and the captured image has high resolution.

The embodiment of the invention discloses a method and device for processing helicopter flow field data, relates to the technical field of rotor aircraft design, can reduce numerical dissipation in the rotor tip vortex transportation process caused by a traditional second-order JST format, and is high in capturing precision of flow details such as tip vortexes. The method comprises the following steps: generating a Cartesian background grid and a skin unstructured grid, and acquiring grid data information; utilizing the grid data information to pre-search and store the unit serial number of avirtual node, which corresponds to each interface and is required for constructing a seven-order WENO format, on a Cartesian background grid; obtaining left and right state values of a unit interface,solving a convection flux value to generate a Cartesian background grid and a skin unstructured grid, obtaining grid data information, and utilizing the grid data information to be on the Cartesian background grid; searching a unit serial number of a virtual node corresponding to each interface and required for constructing a seven-order WENO format in advance, storing the unit serial number, acquiring left and right state values on the unit interface, and solving a convection flux value; performing iterative processing on the flux in the flow field by utilizing the acquired flux on the unitinterface, and converging a processing result; and outputting the processing result to a display device. The invention is suitable for processing flow field data such as propeller tip vortexes.