40results about How to "Reduce indicator requirements" patented technology

This invention discloses a low altitude targeted surveillance method which is on the basis of microphone array joint net. The invention belongs to low altitude targeted surveillance passive positioning technique field. Aim directly at requirement of administration blind area of remote area and monitoring uncooperation object, through microphone array of rational distribution, data merging system of multitude transmitters, low altitude targeted surveillance net of multitude subgroups wirdess network structure, compose single microphone array by means of space array through multitude transmitters, make every microphone receive sound wave signal of flying equipment shaking air radiation, through self-adaptation wave bunch treater, use algorithm such as wave beam shape, use wave beam control delay line, change delay amount of direction control delay line, measure wave direction of object; use multitude self-adaptation treater to superpose to construct self-adaptation transmitter array, make multitude microphone arrays process and obtain multi-target wave direction information by multitude self-adaptation transmitter arrays, merge information from multitude subgroups wirdess network structure to multi-transmitter data merging system, extract objective navigating information.

The invention discloses an optical amplitude modulation method suitable for a CVQKD system. The modulation method comprises an optical isolator, a polarization-maintaining optical coupler BS, a phasemodulator PM and a delay optical fiber DL. Only two passive devices (an optical loop and a 2*2 optical coupler) and a phase modulator are needed to modulate the amplitude of the optical signal precisely by using the special structure of an optical fiber Sagnac (Sagnac) loop. As that amplitude modulation method of the invention does not have the bias drift of the working point when the amplitude ismodulate, the modulation accuracy is high, and the external feedback control is not needed at the same time, the realization structure is simple, the cost is low, and the requirement for the modulated signal is low. This method is especially suitable for amplitude modulation of quantum optical signals in continuous variable quantum cryptosystems. It can greatly improve the stability of continuousvariable quantum key distribution system and greatly promote the practical application of continuous variable quantum cryptosystems.

The invention relates to a frequency-adjustable Butler matrix, which comprises a metal copper-clad upper layer, a dielectric layer, a metal copper-clad lower layer which are sequentially laminated from top to bottom. The frequency-adjustable Butler matrix is characterized in that the metal copper-clad upper layer comprises four groups of frequency-adjustable directional couplers distributed in four directions, two groups of broadband phase shifters distributed in two directions diagonally and two groups of connecting wires. The first group of frequency-adjustable directional coupler is respectively and sequentially in series connection with the first group of broadband phase shifter, the second group of frequency-adjustable directional coupler, the first group of connecting wire, the third group of frequency-adjustable directional coupler, the second group of broadband phase shifter, the fourth group of frequency-adjustable directional coupler and the second group of connecting wire according to the clockwise direction to form a closed loop. The frequency-adjustable Butler matrix has the advantages that the scheme of the frequency-adjustable Butler matrix adopts the frequency-adjustable directional couplers to replace fixed-frequency directional couplers used in a traditional Butler matrix, and the Butler matrix has frequency adjustable capacity.

The invention relates to the technical field of radio frequency communication, in particular to an optical generation method and device for 32-frequency multiplication millimeter wave signals. Comprising the following steps: dividing a light wave into two orthogonal polarization directions, dividing an upper path of light into two paths of light for polarization modulation respectively, dividing a radio frequency signal into two paths for driving corresponding polarization modulators respectively, converging the output, dividing the light wave into two paths again, injecting the two paths of light into the corresponding polarization modulators respectively, converging the output again, and multiplexing a lower path of light. And after the optical carrier is suppressed, a 32-frequency-doubled millimeter wave signal is finally obtained through an optical amplifier. The method designed by the invention has the advantages of high frequency multiplication factor, no need of a filter, simple structure and the like, the quality of the generated signal is higher, the defect of low frequency multiplication factor of the existing millimeter wave generation method can be effectively made up, and the method is suitable for current and future wireless and optical fiber communication systems; the device can reduce the requirement on equipment, thereby realizing the generation of high frequency multiplication millimeter wave signals with lower cost and simple structure.

The invention provides a virtual extensible local area network (VXLAN) tunnel end point (VTEP) adjacency learning method and a VXLAN VTEP adjacency learning device. The VXLAN comprises a VTEP server and a VTEP client. The VTEP serve stores VTEP adjacency information. The VXLAN VTEP adjacent learning method comprises the steps of when the VTEP server determines change of the stored VTEP adjacency information or verifies inconsistency between the VTEP adjacency information of the VTEP client and the VTEP adjacency information of the VTEP server, synchronizing the VTEP adjacency information stored in the VTEP server by the VTEP server to the VTEP client; and storing the VTEP adjacency information which is synchronized from the VTEP server by the VTEP client. Through the VXLAN VTEP adjacency learning method and the VXLAN VTEP adjacency learning device, quick learning for VTEP adjacency is realized through message interaction of two roles of the VTEP server and the VTEP client in a VXLAN network environment.

The invention discloses a method for improving the workability of cement by using tailings powder, which belongs to the technical field of cement processing. The weight percentage content of each component in the cement is: tailings powder 4.5-6%, limestone 7-8%, Non-ferrous metal ash 6-7%, desulfurized gypsum 4-5%, clinker 75-77%, and then through grinding to control the content of particles in the material, optimize the clinker firing temperature and process, and fine processing parameters can be obtained. The workability, fluidity and cohesion of cement can be improved, and the obtained cement product meets the requirements of national standards and has high quality.

The invention discloses a circuit for reducing chopping amplifier output ripple. The circuit comprises a switching capacitor sampling summing circuit, wherein the switching capacitor sampling summing circuit comprises a first switching capacitor circuit, a second switching capacitor circuit and a summing circuit, the second switching capacitor circuit and the first switching capacitor circuit are connected in parallel and have the same structure, and output ends of the first switching capacitor circuit and the second switching capacitor circuit are connected to the input end of the summing circuit. The invention also discloses a measuring device and an amplifying signal measuring method. The circuit for reducing chopping amplifier output ripple is used. The chopping amplifier output ripple width is reduced, an analog low-pass filter is not required, the energy consumption and the area are saved and the design of the circuit is simplified.

The invention discloses a low-altitude target monitoring method based on microphone array networking, and belongs to the technical field of low-altitude target monitoring passive positioning. Aiming at the needs of air traffic control blind spots and monitoring non-cooperative targets in sparsely populated remote areas, through a reasonable layout of microphone arrays, multi-sensor data fusion systems, and a low-altitude target monitoring network structured by multi-hop packet wireless networks, it is composed of multiple sensors in the form of spatial arrays A single microphone array, so that each microphone in the array receives the sound wave signal radiated by the aircraft vibrating air, through the adaptive beam processor, using beamforming and other algorithms, using the beam control delay line, changing the direction to control the delay of the delay line, and measuring the target Direction of Arrival; multiple adaptive processors are superimposed to form an adaptive sensor array, so that multiple microphone arrays can be processed by multiple adaptive sensor arrays to obtain multi-target direction of arrival information, and multi-hop packet wireless network to multi-sensor data fusion The system performs information fusion and extracts the track information of the target.

The invention discloses a radial horizontal drilling system using supercritical carbon dioxide and a drilling method thereof. The drilling system comprises a liquid carbon dioxide supplying device, a drilling device, an in-well pressure control device, a solid, liquid and gas three-phase separating device and a carbon dioxide recycling device, wherein the drilling device is arranged in a shaft, and includes an oil pipe, a steering gear mounted at the bottom of the oil pipe, and a flexible drill stem sleeved in the oil pipe; the flexible drill stem passes through the steering gear and then realizes steering; the flexible drill stem has a hollow drill stem channel; a supercritical carbon dioxide jet drill is mounted at the end of the part, in a horizontal direction, of the flexible drill stem; a nozzle, which is communicated with the drill stem channel, is formed on the jet drill; the in-well pressure control device is disposed at the opening of a well; the solid, liquid and gas three-phase separating device and the carbon dioxide recycling device are disposed on the ground. The radial horizontal drilling system disclosed by the invention uses supercritical carbon dioxide fluid as rock breaking fluid, thus avoiding pollution to oil reservoir layers, effectively protecting the oil reservoir layers, greatly increasing rock breaking efficiency, and realizing cyclic utilization of the carbon dioxide; and the radial horizontal drilling system using supercritical carbon dioxide and the drilling method thereof have important application value to increase of production of old wells and to development of unconventional oil-gas reservoir.

The invention discloses a measurement and control method and system for a satellite orbiting section, and relates to the technical field of satellite measurement and control. The method includes the steps of: establishing uplink and downlink dual communication links between the last stage of a carrier rocket and a user satellite; establishing a relay satellite system The space-based TT&C forward and return links between the carrier rocket and the last stage; through the downlink communication link and the space-based TT&C return link, the satellite telemetry signal sent by the user satellite is sent to the relay satellite system; through the space-based The measurement and control forward link and uplink communication link send the satellite remote control signal sent by the relay satellite system to the user satellite. The measurement and control method of the present invention realizes the telemetry and remote control of the orbiting section of the user star by the relay satellite system by establishing the uplink and downlink dual communication links between the last stage of the carrier rocket and the user star; due to the distance between the user star and the last stage of the carrier rocket It is relatively close, so the requirements for communication antenna indicators are relatively low, and the engineering implementation is relatively simple, which can effectively guarantee the stability of the communication link and realize real-time information interaction.

The invention relates to a frequency-adjustable Butler matrix, which comprises a metal copper-clad upper layer, a dielectric layer, a metal copper-clad lower layer which are sequentially laminated from top to bottom. The frequency-adjustable Butler matrix is characterized in that the metal copper-clad upper layer comprises four groups of frequency-adjustable directional couplers distributed in four directions, two groups of broadband phase shifters distributed in two directions diagonally and two groups of connecting wires. The first group of frequency-adjustable directional coupler is respectively and sequentially in series connection with the first group of broadband phase shifter, the second group of frequency-adjustable directional coupler, the first group of connecting wire, the third group of frequency-adjustable directional coupler, the second group of broadband phase shifter, the fourth group of frequency-adjustable directional coupler and the second group of connecting wire according to the clockwise direction to form a closed loop. The frequency-adjustable Butler matrix has the advantages that the scheme of the frequency-adjustable Butler matrix adopts the frequency-adjustable directional couplers to replace fixed-frequency directional couplers used in a traditional Butler matrix, and the Butler matrix has frequency adjustable capacity.

The invention relates to a self-calibrating method of internal reference resistors of a multi-range digital electronic measuring instrument, comprising the following steps of: on the basis of the design line of the traditional digital electronic measuring instrument, additionally setting an electronic switch and a self-calibrating program; setting a resistor with good long-term stability as an internal standard resistor in a set of internal reference resistors; when in a self-calibrating state, controlling the electronic switch by using the self-calibrating program to form different combinations so as to obtain comparing and measuring circuits among different reference resistors; and respectively and directly or indirectly comparing the reference resistors with the set internal standard resistor to measure respective actual resistance values and storing the actual resistance values in an internal storage for automatically correcting measuring results. Because only one standard resistor with good long-term stability needs to be adopted, other reference resistors are compared and calibrated with the standard resistor, and the method effectively reduces the requirements of other reference resistors, is beneficial to reducing the production cost and ensuring the measuring precision of each measuring process so that the calibration in the production process and the periodic calibration of users both are simpler and more effective and accurate.

The invention provides a total internal reflection color-combination prism, which comprises a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a sixth interface, a seventh interface, an eighth interface, a first surface, a second surface, a third surface, a first incident face, a second incident face, a third incident face and an emergent face, wherein the seventh interface and the eighth interface are crossed and vertical to each other; the seventh interface transmits red light and green light and reflects blue light; the eighth interface transmits the blue light and the green light and reflects the red light; the red light incident from the first incident face is transmitted through the first interface and the fourth interface, and transmitted out of the first surface; the green light incident from the first incident face is transmitted through the second interface and the fifth interface, and is transmitted out of the second surface; the blue light incident from the first incident face is transmitted through the third interface and the sixth interface, and is transmitted out of the third surface; the light incident from the first incident face is reflected by the eighth interface and is emergent from the emergent face; light incident from the third surface is reflected by the seventh interface and is emergent from the emergent face; and light incident from the second surface is directly transmitted by the seventh interface and the eighth interface, and is emergent from the emergent face.