11results about How to "Realize anti-jamming" patented technology

The invention belongs to the technical field of wireless communication, and particularly relates to a Beidou high-precision lightweight anti-interference array antenna which comprises a metal structural member, an antenna bottom plate arranged at the top of the metal structural member and four B3 frequency band unit antennas symmetrically arranged at four corners of the top of the antenna bottom plate, the metal surrounding ring and the air micro-strip multi-frequency integrated antenna are arranged at the top of the antenna bottom plate; the air micro-strip multi-frequency integrated antenna is located in the metal surrounding ring, and the center of the air micro-strip multi-frequency integrated antenna, the circle center of the metal surrounding ring and the center of the antenna bottom plate are coaxially arranged. The Beidou multi-band array antenna formed by combining a plurality of independent antennas can cover B3, B1, L and S bands of Beidou, not only meets the requirements of Beidou navigation equipment, but also realizes the requirements of high-precision positioning, interference resistance and light weight of the navigation equipment.

The invention discloses a broadband partial discharge detection simulation method, a detection circuit and a detection system, and belongs to the technical field of partial discharge signal detection. According to the broadband partial discharge detection simulation method, the sensing model, the analog signal conditioning model, the digital processing model and the shape generation model are established, the broadband impedance unit is utilized, and the broadband detection algorithm and the signal acquisition algorithm are combined, so that the microscopic characteristics of partial discharge and interference pulses can be truly reflected; partial discharge detection in a strong interference environment can be realized, and the operation insulation condition of power equipment can be accurately evaluated, so that the safety and reliability of a power grid system are improved. Furthermore, a plurality of simulation models are constructed, electric signals are processed, detection and virtual simulation of broadband partial discharge are realized, and a credible detection result is obtained, so that the method can be used for structural circuit design analysis and detection effect verification of partial discharge detection equipment, the research and development period can be effectively shortened, manpower and manufacturing cost can be reduced, and the method is suitable for popularization and application. The research and development efficiency is high.

The invention discloses a wireless signal multi-frequency transmission method and system based on a compression algorithm, and relates to the technical field of wireless communication, and the method comprises the steps: dividing a multi-frequency wireless signal into a high-frequency signal band and a low-frequency signal band according to frequency characteristics, and obtaining a to-be-processed signal group; carrying out signal amplitude analysis on the to-be-processed signal group by adopting adaptive threshold detection, generating an amplitude characteristic matrix, dividing compression levels, selecting a wavelet basis function, and respectively carrying out wavelet transformation on a high-frequency signal band and a low-frequency signal band to obtain a transformation coefficient set; dividing the transformation coefficient set into to-be-transmitted data segments according to a preset length, and allocating channel identification codes and check codes to the to-be-transmitted data segments; and distributing the data segments to be transmitted to different frequency bands according to a frequency division multiplexing rule, and setting a protection bandwidth between adjacent frequency bands to complete multi-frequency parallel transmission. According to the technical scheme of combining self-adaptive compression and intelligent transmission, the utilization efficiency of spectrum resources is improved, and the reliability of transmission quality is ensured.

The invention provides a heart CT imaging control method and device, a medium and heart CT imaging equipment, and relates to the technical field of medical imaging. The method comprises the following steps: in response to a starting signal of a first scanning stage, adjusting a collimator of heart CT imaging equipment to a narrow-opening working mode, and after adjusting exposure current to a low-exposure-dose mode, collecting projection data of a heart center section corresponding to different times in the first scanning stage, further determining an exposure moment corresponding to the optimal phase in the second scanning stage; in response to a starting signal of the second scanning stage, after the collimator is adjusted to a large-opening working mode and the exposure current is adjusted to a high-exposure-dose mode, projection data of the heart corresponding to the exposure moment in the second scanning stage is collected, and then a first reconstructed image of the heart at the optimal phase is determined. According to the method, ECG gating is not needed, and a high-quality reconstructed image of the heart in a low-motion state can be obtained under the situation that the exposure dose is slightly increased.

The utility model relates to the technical field of machine part conveying, and discloses a machine part machining conveying device which comprises a workbench, the bottom end of the workbench is fixedly connected with a bearing block, the top end of the left side of the bearing block is fixedly connected with a first motor, and the driving end of the first motor is fixedly connected with a rotating disc. A connecting column is fixedly connected to the left end of the rotating disc, a moving plate is fixedly connected to the left end of the connecting column, a connecting frame is fixedly connected to the right side of the moving plate, a supporting plate is fixedly connected to the left end of the workbench, a supporting frame is fixedly connected to the right end of the supporting plate, and a protective frame is fixedly connected to the left side of the top end of the workbench. A discharging hole is formed in the right side of the protection frame, and the left side of the supporting plate is fixedly connected with a carrying platform. According to the quantitative conveying device, quantitative conveying of accessories is achieved, continuity and efficiency of a production line are improved, and downtime in production is shortened.

The present invention discloses a single local oscillator frequency reduction circuit and a frequency reducer, including a polarized antenna; a multi-stage cascade amplifier circuit, the first stage amplifier circuit is connected to the polarized antenna; a multi-stage radio frequency narrowband filter, the radio frequency narrowband filter is connected to the cascade amplifier circuit at intervals; a phase-locked loop integrated circuit is connected to the last stage radio frequency narrowband filter; a dielectric filter is connected to the phase-locked loop integrated circuit; an output filter circuit is connected to the dielectric filter, and the output filter circuit is connected to an external interface. The multi-stage cascade amplifier circuit can enhance the reception of radio frequency signals, and the multi-stage radio frequency narrowband filter can effectively suppress signals in the 3.4GHz to 3.7GHz band during the transmission of radio frequency signals, thereby achieving anti-interference. After the radio frequency signal is processed by the phase-locked loop integrated circuit, it enters the dielectric filter, which can suppress the out-of-frequency signal, and further filter out the interference signal through the output filter circuit to obtain a high narrowband intermediate frequency bandwidth, which is beneficial to improving the anti-interference ability of the frequency reducer.

The invention discloses a gypsum mine collapse monitoring system and a method for assembling the system, comprising a borehole, a monitoring sensor, a demodulation device, a monitoring platform, and a buzzer; a plurality of boreholes are independently arranged at various monitoring positions in a goaf area; a monitoring sensor is arranged in a borehole; a demodulation device is arranged in a safe area; the demodulation device is connected to the monitoring sensor and uploads monitoring data to monitoring software of a monitoring platform so as to issue a prejudgment alarm; a buzzer is installed at a surface position of a monitoring point and is connected to the demodulation device; the monitoring sensor comprises a fiber grating displacement meter, a fiber grating piezometer, a geological disaster alarm, and a seismic detector; the buzzer issues an on-site alarm according to a signal of the geological disaster alarm; the monitoring sensor monitors multiple parameters of the geology of the goaf area, collects comprehensive data, realizes all-round monitoring, and simultaneously provides prejudgment alarms and on-site alarms, so as to help operators quickly make timely response measures to dangerous geological conditions.

The utility model relates to a capacitive touch screen capable of improving interference resistance, which comprises a capacitive touch screen sensor, a touch chip and a system power supply part, the capacitive touch screen sensor is connected with the touch chip, and the touch chip is connected with the system power supply part; the touch chip comprises a receiving part and a transmitting part, and the receiving part of the touch chip comprises a signal receiving part, a touch driving circuit part and a band-pass filter; the system power supply part comprises a power supply part and a power supply interference signal suppression circuit; the capacitive touch screen is simple in structure, and the anti-interference performance of the capacitive touch screen can be effectively improved.

In various intelligent systems, the system needs to adjust its behavior based on external feedback. For example, industrial equipment adjusts its operating parameters based on operator instructions, recommendation systems optimize recommendations based on user feedback, and vehicle systems execute operations based on driver instructions. However, existing technologies suffer from homogenized feedback processing, static weights, simplistic feedback handling, and a lack of closed-loop optimization. Therefore, a method is needed that can dynamically adjust weights based on the source, resist interference through an accumulation mechanism, and continuously optimize the feedback processing strategy to improve the robustness and intelligence level of the system. This application provides a feedback processing method, system, and computer-readable storage medium based on source weights, aiming to achieve robust and adaptive feedback processing by dynamically maintaining source weights, accumulating feedback until a threshold is triggered, and continuously optimizing based on the feedback results.

This utility model relates to the field of electronic detonator technology, and in particular to an integrated end-piece and spring sheet structure for use in wireless electronic detonators. The integrated end-piece and spring sheet structure for use in wireless electronic detonators includes: a first terminal and a second terminal, connected by an insulating adhesive block; the end-piece and spring sheet include a fixed end and a free end, the fixed end being embedded in the insulating adhesive block, and the free end extending outwards; wherein, when the first terminal and the second terminal are partially placed inside the casing, the free end abuts against the inner wall of the casing to limit the movement of the first and second terminals, and also to conduct static electricity through the inner wall of the casing. Through the above structure, the two terminals and the spring sheet are fused together with insulating adhesive, achieving not only anti-interference, anti-static, and circuit protection functions, but also saving materials and costs, reducing welding times, saving space on the wireless electronic detonator, and being compatible with other functional devices in more control modules.

The present invention relates to an explicit guidance method for anti-interference fixed-point landing of a spacecraft, comprising: establishing a dynamic model in a LVLH coordinate system; establishing an interference observer, estimating the disturbance online to obtain an anti-interference term, and introducing it into a guidance instruction for compensation to obtain a disturbance-compensated model; constructing a guidance law for the disturbance-compensated model using an optimal principle, and solving the guidance instruction; solving to obtain an analytical range expression, and calculating a thrust correction value to achieve control of the anti-interference fixed-point landing of the spacecraft. The method of the present invention can ensure the guidance accuracy in the presence of uncertain interference, and has the advantages of small calculation amount and being able to achieve fixed-point landing.