9results about How to "Shield interference" patented technology

This invention discloses an automatic road surface smoothness detection system for road construction, belonging to the field of road construction quality inspection technology. The system includes: an image acquisition unit for real-time acquisition of original road surface images during asphalt paving and synchronous acquisition of paver vibration characteristic information corresponding to the original road surface images; a data processing module, communicatively connected to the image acquisition unit, for receiving the original road surface images and the paver vibration characteristic information, achieving smoothness detection through vibration adaptive image analysis technology, and outputting structured detection results; and a data output unit, communicatively connected to the data processing module, for receiving the structured detection results and realizing real-time display and anomaly warning during the asphalt paving process. It has the effects of adapting to the vibration state of asphalt paving construction, shielding against dust and high-temperature reflective interference, and improving the accuracy and real-time performance of smoothness detection.

The application belongs to the field of display module residual image quantitative test, and relates to a display module residual image quantitative test device, which comprises a lower jig, an upper jig b provided above the lower jig, and an upper jig a fixedly connected to one side of the upper jig b; a shielding assembly provided between the lower jig and the upper jig b, the shielding assembly comprising a through hole b, a partition grid a and an optical test probe; and a switching assembly provided on the top of the lower jig. Through the arrangement of the shielding assembly, the upper jig a or the upper jig b can cover the entire display module main screen area, and only the through hole a or the through hole b position is reserved for brightness measurement, external light interference is effectively shielded, and it is ensured that the measurement data reflects the true brightness value of the display module main body itself. Through the arrangement of the switching assembly, the switching of the upper jig a and the upper jig b can facilitate the test of the black-white junction center position and improve the detection comprehensiveness.

The utility model relates to a kind of three coaxial output switching device, it includes closed shell, PCB board, phoenix terminal and three coaxial socket;PCB board is fixedly arranged in closed shell;The side of phoenix terminal is fixed on PCB board and is electrically connected with PCB board, the other side of phoenix terminal is plug-in end and passes out to the outside of closed shell, and phoenix terminal is spaced apart with the inner wall of closed shell;The side of three coaxial socket is fixed on PCB board and is electrically connected with PCB board, the other side of phoenix terminal is connecting end and passes out to the outside of closed shell;Phoenix terminal, PCB board and three coaxial socket form switching part, by the closed shell being set, and the connecting part of phoenix terminal, PCB board and three coaxial socket three is located in the inside of closed shell, closed shell can effectively shield the interference of external signal;And the part of phoenix terminal in closed shell is spaced apart with the inner wall of closed shell, can avoid the leakage between the pin of phoenix terminal, and test precision is high.

The utility model discloses an integrated unmanned vehicle ground reference station, including shell and front cover, the front cover sets up at the front of shell, the front of front cover and the back of shell all is provided with the fin, the front of fin is provided with the cooling fan, the back of shell inner chamber is provided with power module, picture transmits module, flight control module, conversion module, data exchange module and satellite time service module in proper order. The utility model discloses through fin is a kind of passive heat dissipation equipment, usually made of metal material, its working principle is through increasing radiating area to improve heat conduction efficiency, and fin is in close contact with heating element, and the heat generated by element is rapidly conducted to the surface of fin, and the heat is dissipated to air through natural convection, and through cooling fan is a kind of active heat dissipation equipment, and the rotation of fan blade is driven by motor, and forced convection air is used to accelerate the dissipation of heat, to further improve the heat dissipation efficiency.

This invention discloses a small-sized printed circuit board radio frequency identification (RFID) tag antenna with anti-metal interference, comprising three metal layers from top to bottom. The top layer is a radiating layer with a "U"-shaped antenna of zigzag structure on its surface. The middle layer is an impedance matching layer with a non-resonant loop structure on its surface. The bottom layer is a grounding shielding layer. An FR-4 dielectric substrate is placed between the top radiating layer and the impedance matching layer, and similarly, an FR-4 dielectric substrate of the same thickness is placed between the impedance matching layer and the grounding shielding layer. Furthermore, short-circuit walls connecting the three metal layers are provided on both sides of the edges. This invention utilizes mature printed circuit board (PCB) processing technology, enabling efficient and low-cost manufacturing of the tag antenna. The stability and consistency of PCB processing technology ensure product quality while supporting large-scale mass production, suitable for industrial applications. Combined with the multi-layer antenna design of this invention, the precise processing of complex electromagnetic structures is achieved through standardized processes, simplifying the production process and significantly reducing manufacturing costs. Compared with traditional ceramic antenna designs that require precise material preparation, molding and sintering steps, this invention is not only easier to process, but also more cost-effective and easier to promote and apply.

A method and device for managing link state in an MRP ring network, the method comprising: in an open loop state, in response to receiving a first MRP link state packet from any one of two ring ports of an MRM, starting a time window with the time of the receiving as the starting point; within the time window, in response to receiving a first MRP link state packet from the other of the two ring ports, and the link states indicated by the first MRP link state packets received by each of the two ring ports being different, determining the ring port receiving the first MRP link state packet first as a priority port, and determining the ring port receiving the first MRP link state packet later as a sub-priority port; before determining that the forwarding path is in a stable state, processing each MRP link state packet received from the priority port in turn, and not processing each MRP link state packet received from the sub-priority port, effectively suppressing the occurrence of ring network oscillation.

This invention relates to a UAV target recognition method based on ISAC signal decomposition and background contrast attention fusion, belonging to the field of radar signal processing. The method includes: configuring the transmitted signal of an ISAC base station based on a 5G NR frame structure; receiving and establishing a CSI mixed signal model; constructing a parameterized operator; using the rmD-NSP algorithm to iteratively decompose the mixed signal, separating the rotor micro-Doppler component, and converting the separated signal into a micro-Doppler time-frequency spectrum; using the RMBL module to model multi-scale background features of the time-frequency spectrum; using the BCA module to calculate the difference weights between target features and background features, generating a background-suppressed micro-motion feature vector; generating an HRRP sequence using the CSI mixed signal; using an LSTM network to extract the target's geometric structure feature vector; and weighted concatenating and fusing the micro-motion feature vector and the geometric structure feature vector and inputting them into a classifier to output the UAV target's category probability.

This invention discloses a probe module for crystal oscillator frequency testing, comprising a test circuit board, a non-metallic block, and several probe assemblies. Each probe assembly includes a probe, a probe sleeve, an insulating sleeve, a metal sleeve, and a shielding wire. The non-metallic block has several holes that match the metal sleeves. The probe is inserted into one end of the probe sleeve, and the inner core of one end of the shielding wire is inserted into the other end of the probe sleeve. The probe sleeve is correspondingly positioned within the insulating sleeve, the insulating sleeve within the metal sleeve, and the metal sleeve within the holes of the non-metallic block. The other end of the shielding wire is electrically connected to the test circuit board. This invention uses a metal sleeve, such as stainless steel, on each probe to create a Faraday cage effect, shielding against external electromagnetic interference. This invention can simultaneously test multiple crystal oscillators, improving testing efficiency.