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99results about How to "Less catch" patented technology

Beam switching method, system and device based on low earth orbit satellite and storage medium

The invention discloses a beam switching method, system and device based on a low earth orbit satellite and a storage medium, and the method is applied to a satellite terminal, and comprises the steps: obtaining the ephemeris information of the low earth orbit satellite; according to the ephemeris information and the geographic position information of the satellite terminal, obtaining a target beam to be switched and a target moment when switching occurs; switching to the target beam at a target moment; selecting the strongest adjacent beam with the strongest signal quality of the target beam;and switching to the strongest adjacent beam. According to the invention, switching parameters are flexibly configured according to the position information and ephemeris information of the satelliteterminal; the wave beam becomes a target wave beam more easily; and switching the beam to the target beam according to the switching moment, according to the invention, the switching accuracy is improved, the switching accuracy and the strongest beam reservation time are also improved by selecting and residing in the strongest adjacent beam under the target beam, the difficulty of link capture and tracking caused by Doppler frequency shift is reduced, the beam switching efficiency is improved, and the network searching efficiency of the satellite terminal is improved.
Owner:BEIJING SPREADTRUM HI TECH COMM TECH CO LTD

Semantic segmentation method and system based on dynamic interpolation reconstruction for streetscape understanding

The invention relates to a semantic segmentation method and system based on dynamic interpolation reconstruction for streetscape understanding, and the method comprises the steps: carrying out the preprocessing of an input image of a training set, enabling the image to be standardized, and obtaining preprocessed images with the same size; extracting general characteristics by using a convolutionalnetwork, then obtaining hybrid space pyramid pooling characteristics, and extracting coding characteristics by using the two parts of cascading as a coding network; selecting an intermediate layer characteristic from the convolutional network, calculating an interpolation weight characteristic in combination with the encoding characteristic, constructing a decoding network in a dynamic interpolation mode, reconstructing an image resolution, and calculating a decoding characteristic; performing calculating to obtain edge-enhanced semantic segmentation loss, and training the deep neural networkwith the purpose of minimizing the edge-enhanced semantic segmentation loss; and performing semantic segmentation on the to-be-segmented image by using the deep neural network model, and outputting asegmentation result. The method and the system are beneficial to improving the accuracy and robustness of image semantic segmentation.
Owner:FUZHOU UNIV

Method for improving incoherent detection performance of MSK (minimum shift keying) signals

The invention provides a method for improving the incoherent detection performance of MSK (minimum shift keying) signals, and aims at providing the method solving the problem of MSK signal application limitation caused by poorer incoherent detection performance and realization difficulty of coherent detection of the MSK signals. The method provided by the invention is realized through the following technical scheme that in an MSK data transmission receiving machine, a signal capture module stores baseband signals after the down-conversion into a memory, then, a high-speed clock is used for reading out the stored signals from the memory, next, the read signals are subjected to frequency offset compensation and bit synchronization searching according to the pre-divided frequency grooves, and the searching results are sent to a signal tracking module; the signal tracking module realizes the frequency and bit synchronization tracking through a frame head waveform matching correlator according to the capture results sent from the signal capture module; and a correlation judging module carries out correlation calculation on the signals sent by the signal tracking module with the local waveforms, selects the maximum correlation value from the correlation results and adopts the bit of the maximum correlation value corresponding to the middlemost part of the bit flow as the final judgment results to be output.
Owner:10TH RES INST OF CETC

Power control device and method used for low voltage ride through of direct-drive wind driven generator

InactiveCN103762919AImproved intrinsic pitch angle controlMeet the control requirements of active and reactive powerSingle network parallel feeding arrangementsReactive power adjustment/elimination/compensationWind drivenTerminal voltage
The invention discloses a power control device and method used for low voltage ride through of a direct-drive permanent magnetic synchronous wind driven generator. The device comprises a generator speed measuring module, a direct current voltage measuring module, a generator terminal voltage measuring module, a generator terminal current measuring module, a grid measurement voltage measuring module, a grid measurement current measuring module, a maximum power tracking and controlling module, a grid measurement power measuring module, a wind speed measuring module, a pitch angle measuring module and a power coordination control module. The invention further provides the power control method, active power and reactive power of a unit in a temporarily stable state period can be coordinated and controlled, so that the direct-drive wind driven generator effectively achieves low voltage ride through in a maximum power tracking area and a power limiting area, and the unit can provide dynamic reactive support for a power grid in a low-voltage transient state period. The power control device and method can use the control means of the direct-drive wind driven generator self sufficiently and reasonably without adding unloading hardware, and the power control method is easy to implement and remarkable in effect.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)

Megawatt wind power generation master control system

The invention discloses a megawatt wind power generation master control system, which comprises a master control unit, an upper monitoring system, a pitch control system and a variable frequency system, wherein the master control unit consists of a tower-bottom control cabinet and a cabin control cabinet; the tower-bottom control cabinet is provided with a master control central processing unit (CPU) module, a remote input output (IO) extended optical fiber master module, a CANOpen communication master module, an RS232 expansion module, a tower-bottom universal IO module, a first multimode optical fiber port four-electrical port industrial switch, a single-mode photoelectric converter, a first pigtail box, an in-situ upper computer and multimode optical fibers; and the master control unit is connected with the upper monitoring system through the single-mode photoelectric converter, connected with the variable frequency system through the CANOpen communication master module and connected with the pitch control system through an RS485 module. In the megawatt wind power generation master control system, the characteristics of a wind machine are taken as bases, and when the wind machine runs at an optimal tip-speed ratio lambda, a fan unit captures maximum energy to maintain the stable output power of a generator.
Owner:ZHEJIANG ZHONGKE AUTOMATION ENG TECH

Space junk removal satellite device

The invention discloses a space junk removal satellite device which comprises a satellite body and a task execution module. The satellite body comprises a first structure box, a power module, a navigation module, an orbit control module, a flight control module, a wireless communication module and a solar cell array, the power module, the navigation module, the orbit control module, the flight control module and the wireless communication module are arranged in the first structure box, the first structure box is a cube, and all the faces of the box are fixed through mechanical structures; andthe task execution module comprises a second structure box, a task control module, a detection recognition module, a capture module, a smashing module, a transporting module and a laser ablation module, the task control module, the detection recognition module, the capture module, the smashing module, the transporting module and the laser ablation module are arranged in the second structure box, the second structure box is a cube, the left side face of the second structure box is a fixed face mechanically locked to the satellite body, and the remaining five faces are each of a deformable structure and can be unfolded and folded within the range from -60 degrees to 60 degrees. The device can capture and remove small-size space junk, and the space junk containing a conductive material can beablated through the laser ablation module and then secondarily used to supply energy to the laser ablation module.
Owner:LANZHOU JIAOTONG UNIV

Vertical type electromagnetic braking device for controlling flow of molten steel in continuous casting crystallizer

The invention relates to a vertical type electromagnetic braking device for controlling flow of molten steel in a continuous casting crystallizer. The vertical type electromagnetic braking device comprises one or two pairs of horizontal magnetic poles, a magnet exciting coil, two pairs of vertical type magnetic poles and a magnet yoke; when one pair of horizontal magnetic poles are arranged, the horizontal magnetic poles are located below an intrusive type water opening and distributed along a wide face of the crystallizer; when two pairs of horizontal magnetic poles are arranged, the horizontal magnetic poles are marked as upper horizontal magnetic poles and lower horizontal magnetic poles, the lower horizontal magnetic poles are located below the intrusive type water opening and distributed along the wide face of the crystallizer, and the upper horizontal magnetic poles are located nearby the surface of the molten steel in the crystallizer and distributed along the wide face of the crystallizer; the two pairs of vertical type magnetic poles are distributed nearby areas of the two side faces of the crystallizer and intersect with the one or two pairs of horizontal magnetic poles; the magnet exciting coil and the magnet yoke are matched with the horizontal magnetic poles to be installed, a current is exerted through the magnet exciting coil, and a steady-state magnetic field is generated between the horizontal magnetic poles and the vertical type magnetic poles; and when passing through the steady-state magnetic field, the molten steel flowing in the crystallizer bears electromagnetic force opposite to the flowing direction of the molten steel, and flow of the molten steel in the crystallizer is controlled through the electromagnetic force.
Owner:NORTHEASTERN UNIV LIAONING

Navigation signal capturing to tracking method and system

InactiveCN105527636AReduce capture and trace timeBroad application prospectsSatellite radio beaconingVIT signalsSatellite
The invention relates to a navigation signal capturing to tracking method and system. The method comprises that serial 2D blind searching is carried out on a navigational star via a first channel, a tracking loop is turned to, and instant code phase information of the navigational start is output; code phase information in the capturing start time and code phase information in the capturing complete end time of the navigational star are rapidly captured via a second channel, and a fixed delay value is calculated; a fixed code delay difference from the capture start time to time when a capturing result is turned to the tracking loop is obtained according to the code phase information in the capturing start time and the instant code phase information; and a to-tracking fixed delay value is captured according to the fixed code delay difference and the fixed delay, and to-tracking code phase compensation is carried out according to the fixed delay value. According to the scheme, the fixed delay value is calculated accurately, a capturing code phase result is output in a compensated manner, and the method and system can be applied to accurate satellite object tracking. According to a real-time code phase deviant calculation method, the code phase deviant is compensated accurately, and the navigation signal capturing and tracking time can be shortened.
Owner:SPACE STAR TECH CO LTD
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