15results about How to "Increase transmit power" patented technology

This invention provides a novel scanning laser wind-measuring radar, employing a high-stability, narrow-linewidth semiconductor laser as the transmitting device. A high-speed optical switch precisely modulates the continuous laser in the time domain to generate ideal laser pulses. High-power amplifiers and low-noise amplifiers are used to enhance the transmitted power and echo signal quality, significantly compensating for the decrease in atmospheric echo power and improving range resolution and wind speed accuracy. The high-stability, narrow-linewidth laser improves the signal-to-noise ratio through a triple mechanism of increased coherence efficiency, reduced background noise, and sharpened spectral resolution, enabling long-range detection. When using a transceiver telescope system, it avoids a reduction in the scanning field of view due to a decrease in signal-to-noise ratio. The semiconductor laser solution is lighter than fiber lasers, suitable for airborne platforms, and enables miniaturized laser wind-measuring radar equipment. Furthermore, the high-stability, narrow-linewidth semiconductor laser used meets temperature and vibration stability requirements, ensuring the long-term reliability of the wind-measuring radar in field environments.

The application discloses a 750-850nm waveband photonic crystal surface emitting laser and a preparation method, and belongs to the field of semiconductor lasers. The application is divided into surface etching and buried photonic crystal layer structures, uses n-GaAs as a substrate, combines surface etching or buried photonic crystal structures, uses amorphous silicon, titanium oxide, GaP or AlGaAs as main materials of a resonant cavity, utilizes large-area in-plane resonance and high coupling with a quantum well active layer, realizes low-loss resonance and optical gain, and realizes a 750-850nm waveband semiconductor laser with high light beam quality, high power and surface emission.

This application discloses a resonant DC / DC converter, system, method, and controller, including: a primary-side circuit, a resonant cavity, a secondary-side circuit, and a controller; the first terminal of the primary-side circuit is connected to a DC source, the second terminal of the primary-side circuit is connected to the first terminal of the resonant cavity, and the second terminal of the resonant cavity is connected to the secondary-side circuit; the controller is used to achieve zero-current turn-off of the primary-side circuit's switching transistor when the gain of the resonant DC / DC converter is less than 1, and when the gain of the resonant DC / DC converter is greater than 1, and when the switching frequency of the resonant DC / DC converter is greater than the resonant frequency of the resonant cavity, to achieve zero-current turn-off of the primary-side circuit's switching transistor. Thus, during startup, the switching transistor of the primary-side circuit of the resonant DC / DC converter can achieve zero-current turn-off, protecting the switching transistor.

The application provides a downhole electric drilling tool for gas drilling and an application method thereof, wherein the downhole electric drilling tool comprises a drill string joint, a power unit, a transmission unit and a drill bit, the drill string joint is fixedly connected to the upper end of the power unit, and the drill string joint is used for connecting the electric drilling tool with an upper drill string; the transmission unit and the drill bit are sequentially connected to the lower end of the power unit, the power unit comprises a power supply assembly and a motor, the power supply assembly is connected with the motor, and the power supply assembly can provide power for the motor; the transmission unit comprises a speed reducer, the speed reducer is connected between the motor and the drill bit, and is used for transmitting the power output by the motor to the drill bit to drive the drill bit to drill. The application adopts a mode that high-density storage batteries directly supply power to the electric drilling tool, and then a planetary reducer is used to obtain the torque required for sliding drilling of gas drilling, and the driving mode of a gas screw is abandoned, and the operation capacity and reliability are greatly improved.

The application discloses an AM transmitting signal modulation depth calibration method and device, and relates to the technical field of communication. The method comprises the following steps: initializing and configuring an AM transmitting link according to a control signal sent by an AM detection control link to obtain an initial AM amplitude modulation signal; performing signal conversion on the initial AM amplitude modulation signal to obtain an AM envelope digital signal, and performing preliminary AM carrier signal and modulation signal amplitude calibration according to the AM envelope digital signal to obtain a preliminary amplitude calibration result; generating a control signal of the AM transmitting link, traversing a working frequency range of the AM transmitting link according to the control signal of the AM transmitting link, and performing S2 to complete the AM modulation depth calibration point by point. The application can make the modulation depth of the AM transmitting signal meet the corresponding standard requirements, thereby improving the transmission quality and power utilization rate of the AM transmitting signal and ensuring the signal transmission efficiency.

The application discloses a BWPT system power control method suitable for a variable receiving end of an electric vehicle. The system is composed of a network side and a vehicle side DC bus, a filter capacitor, a bidirectional full-bridge converter, a resonance compensation network, a magnetic coupling mechanism and a sampling and digital control module. The receiving end receiving coil structure is variable, and LCC or S compensation can be adopted. In the forward charging and reverse power feedback mode, the control module is based on the DC side voltage sampling and the power analysis model, and the rated output power is the primary target, and the system driving frequency and the external phase angle are adjusted. The method can realize stable and practical power control under the condition of "fixed primary side and variable secondary side".

This application provides a vehicle-mounted communication terminal, a vehicle-mounted communication system, and a vehicle, relating to the field of vehicle networking technology. The vehicle-mounted communication terminal includes a processing component and a satellite short message component. The satellite short message component is connected to the satellite communication terminal of the processing component. A general-purpose integrated circuit card (GPIC) is built into the satellite short message component, containing a BeiDou user identifier. The processing component receives communication information and sends it to the satellite short message component. The satellite short message component sends the communication information and the BeiDou user identifier to the BeiDou satellite in short message format. The communication information includes receiving device information and specific communication content. The BeiDou user identifier is used to uniquely identify the vehicle-mounted communication terminal in the BeiDou network. This application can solve the problem of vehicles being unable to communicate when terrestrial communication networks are unavailable.

The utility model discloses an active device for signal synchronization of a cinema 3d film and 3d glasses, and relates to the technical field of image signal processing, and the active device comprises a mainboard, and an infrared transmitter, a knob, a display screen and a laser calibrator which are connected with the mainboard; the mainboard is used for receiving a synchronizing signal of the projector and driving the infrared transmitter to output an infrared signal according to the synchronizing signal, is also used for detecting the state of the infrared transmitter and displaying the state through the display screen, and is also used for controlling the laser calibrator to debug the synchronizing signal; the infrared transmitter is provided with a plurality of lamp beads so as to increase the infrared signal transmitting power; the synchronizing signal is used for synchronizing a 3d movie and 3d glasses; and the knob is used for controlling the synchronous signal to be output in advance or in a lagging manner. According to the invention, the 3d movie and the 3d glasses can be subjected to signal synchronization in time, and the playing effect is improved.

The application relates to an enhanced detection method based on a reconfigurable intelligent surface assisted radar, which comprises the following steps: an electromagnetic scattering characteristic model of an enhanced detection system comprising a radar, a target and an RIS array is established; a power ratio of a radar direct link and an RIS link is obtained based on the electromagnetic scattering characteristic model, and the power ratio of the radar direct link and the RIS link is used as an optimized objective function; the reflection coefficient matrix of the RIS array is optimized and solved to maximize the objective function, so that an optimal coding matrix is obtained; the reflection coefficient of each RIS unit is obtained according to the optimal coding matrix, and then the state of each unit of the RIS array is obtained, and an enhanced detection system integrating the RIS array and the radar is constructed. According to the application, a new autonomous controllable transmission link is constructed between the target and the radar receiver, and the radar system only needs to perform coherent processing on the double-link received echo signals in the back-end signal processing, so that the radar receiving echo power can be enhanced.

The utility model relates to the technical field of antennas, in particular to a 0.02 GHz-6GHz broadband signal emission combined antenna device, which comprises an emission installation panel and nine omnidirectional antennas installed on the emission installation panel, the arrangement sequence and the spacing of the antennas are as follows: an antenna 4, an antenna 6, an antenna 2, an antenna 1, an antenna 3, an antenna 5, an antenna 7, an antenna 9 and an antenna 8 in sequence from left to right, the spacing between the antenna 4 and the antenna 6 is 5cm, and the spacing between the antenna 4 and the antenna 6 is 5cm. The distance between the antenna 6 and the antenna 2 is 10cm, the distance between the antenna 2 and the antenna 1 is 15cm, the distance between the antenna 1 and the antenna 3 is 15cm, the distance between the antenna 3 and the antenna 5 is 10cm, the distance between the antenna 5 and the antenna 7 is 5cm, the distance between the antenna 7 and the antenna 9 is 5cm, the distance between the antenna 9 and the antenna 8 is 5cm, the distance between the antennas with similar frequencies is more than 15cm, near-field electromagnetic coupling is weakened, the positions of high-frequency and low-frequency antennas are staggered, and octave interference is avoided. After optimization, the standing-wave ratio of the antenna array is reduced, and the mutual coupling strength is weakened.

The application discloses a kind of single-pixel imaging method and device based on array light source, including obtaining the illumination light field of array light beam and the back light intensity detection value of the reflection back after array light beam irradiation on target object;Based on back light intensity detection value and illumination light field, reconstruct target image as rough target image;Based on rough target image and back light intensity detection value, reconstruct target image using depth neural network without training, output final target image.The present application realizes high efficiency imaging and long distance target detection based on array light source, while removing image noise, artifact and periodicity by introducing depth neural network, further improves the imaging quality and imaging efficiency of single-pixel imaging.

The application discloses a rotary flapping-wing underwater low-frequency sound emitting device and a control method. The device comprises a support and a flapping-wing device for flapping water flow. The support is provided with a rotary driving device for controlling the rotation of the flapping-wing device and a flapping device for controlling the linear reciprocating motion of the flapping-wing device. When the device is started and operated, the rotary driving device controls the rotary motion of the flapping-wing, and the flapping device controls the periodic linear reciprocating motion of the flapping-wing at the same time. The flapping-wing flaps the water flow under the cooperative driving of the rotary motion and the linear reciprocating motion, so that the water flow forms a multi-directional and periodic composite disturbance, greatly improves the energy exchange efficiency of the flapping-wing and the water flow, and improves the emission power of the low-frequency sound wave. Moreover, the rotary motion and the linear reciprocating motion of the flapping-wing do not interfere with each other, the rotary motion parameters and the linear reciprocating motion parameters of the flapping-wing can be independently adjusted, different frequency characteristics of the low-frequency sound wave can be modulated, and different underwater application scenarios can be adapted.

A regenerative braking engine for new energy sources includes a casing, a heat regenerator, a working fluid cylinder, a working fluid piston, a working fluid piston rod, an upper limit ring, a lower limit ring, a receiver piston, an upper permanent magnet ring, a lower permanent magnet ring, a sleeve, a drive head permanent magnet ring, a heater, a transmission grease chamber, an outer spherical cylinder, an integrated connecting rod piston, a crankshaft, a crankcase, a pressure regulating plug, and a pressure regulating cylinder liner. The heat regenerator is fixedly connected to the top and inner wall of the casing. The heater is fixedly connected to the top of the heat regenerator. The working fluid cylinder is located below the heater and fixedly connected to the top of the heat regenerator. The receiver piston is floatingly connected to the lower end of the inner wall of the outer shell. The upper and lower permanent magnet rings are fixed inside the sleeve and fixedly connected to the upper part of the receiver piston. The driving head permanent magnet ring at the lower end of the working fluid piston rod extends into the working space of the upper and lower permanent magnet rings. The magnetic field directions of the upper and lower permanent magnet rings and the driving head permanent magnet ring are the same. A working gap is provided between the driving head permanent magnet ring and the upper and lower permanent magnet rings. The crankcase is fixedly connected to the outer shell, the outer spherical cylinder is fixedly connected to the crankcase, the lower end of the integrated connecting rod piston is hinged to the crankshaft, and the upper end passes through the outer spherical cylinder and enters the transmission grease chamber, where it is immersed in grease.

The application discloses a face recognition method and device, electronic equipment and storage medium, and relates to the technical field of face recognition. The method comprises the following steps: in response to a face recognition instruction, the integrity of a first region is detected; if it is detected that the first region is broken, the current emission power of a target light source is increased to a first target power, and the first target power is less than a first power threshold; the target light source is controlled to emit light at the first target power, and an image acquisition unit is used to acquire a first face image in an environment; and face recognition is performed according to the first face image. In this way, the problem that, in the case that the screen is broken, the emission power of the target light source after being increased is too large, the energy of the light emitted by the target light source is too large, the human eye safety standard is exceeded, and the human eye is damaged during the face recognition process is avoided, and the safety of the human eye recognition process is further ensured.

This invention relates to the field of power line carrier communication technology, specifically to a control method, processor, control device, and storage medium for power lines. The method includes: connecting phases A, B, and C of a power line to the same coupler and setting them to share a common N terminal, forming a three-phase coupling transformer; setting the number of turns of the primary and secondary coils of the three-phase coupling transformer to be equal; and setting the coupling inductance power of the weak current side analog-to-digital converter terminal, the weak current side digital-to-analog converter terminal, and the strong current side phases A, B, and C of the three-phase coupling transformer to be equal. The three parallel communication signals ensure that an interruption in any one channel does not affect the signals of the others, i.e., a phase loss does not cause communication interruption, thus improving the quality of three-phase communication. Phases A, B, and C are synchronized when transmitting and receiving signals, achieving multiple-input multiple-output (MIMO) and enhanced signal strength. The transmit and receive power of the coupler are both increased, improving channel quality and enhancing communication success rate and reliability.