47results about How to "To achieve high precision requirements" patented technology

An antenna device comprises a reflecting plate, a top shielding cover arranged on one side of the reflecting plate, a first frequency band feed network, a substrate, a first frequency band radiating face, a first frequency band medium layer, a second frequency band radiating face, a second frequency band medium layer, at least one first frequency band feed probe, a second frequency band feed probe, a second frequency band feed network arranged on the other side of the reflecting plate and a low-noise amplifying circuit. The top shielding cover is fixed on the substrate, the first frequency band radiating face is connected to the first frequency band feed network through the first frequency band feed probe, the second frequency band radiating face is larger than the first frequency band radiating face and positioned on the second frequency band medium layer, the second frequency band radiating face is connected to the second frequency band feed network through a second frequency band feed probe, and the first frequency band feed network and the second frequency band feed network are connected with the low-noise amplifying circuit. The invention further provides a receiving system. By means of the antenna device and the receiving system, mutual interference between all frequency points is avoided, the phase stability of an antenna is improved, and the measuring accuracy is improved.

The invention discloses a method for acquiring the C/A code signals of a GPS in the GPS communication technical field. The method comprises a rough acquisition process and a precise acquisition process. The rough acquisition process comprises the following steps: searching a plurality of parallel satellites set by a system and obtaining a rough code phase and carrier frequency by using code phase search based on FFT; and the precise acquisition process comprises the following steps: setting a precise acquisition carrier frequency step according to the code phase and the carrier frequency obtained from rough acquisition and determining the search scope of precise acquisition; and removing the correlation between input signals and local carrier signals influenced by the code phase and comparing a correlation value and a resetting threshold value to determine whether satellite signals can be really acquired. Compared with the prior GPS acquiring method, the invention improves the acquisition performance of GPS signals, ensures the GPS fast acquisition, and simultaneously achieves the high-accuracy requirements of the GPS acquisition.

The invention provides a preparation method for a percutaneous navigation guide board combined with a body position fixation device, pertaining to the field of medical instruments. The method comprises the following steps: (1) utilizing the body position fixation device; (2) fixing a marker to the skin surface corresponding to a required surgical spot of a human body, which is used for fixing the navigation guide board; (3) utilizing CT scanning technology to scan the required surgical spot to obtain spatial position data of a human body dissecting structure; (4) inputting CT scanning spatial position data into a computer and carrying out digital and three-dimensional reconstruction; (5) simulating operations in the virtual three-dimensional structure and virtually inserting needles/ nails on the virtual skin surface where markers are located; (6) fitting the navigation guide board on the virtual skin surface, wherein the navigation guide board is closely attached to the skin surface and can be used for virtual needle/ nail insertion adapted to the virtual markers and the navigation guide board has guide pipelines; (7) inputting data of the above virtual guide board into a 3D printer, wherein the 3D printer obtains the percutaneous needle/nail-inserting navigation guide board which can be used in combination with the body position fixation device.

The invention relates to a microscopic welding micro-tensile measuring instrument, which comprises a base, a support column arranged on the base, a frame arranged on the top of the support column, a workpiece chuck capable of moving up and down relative to the frame and a workbench which is arranged on the base and corresponds to the workpiece chuck, wherein a tension conducting structure with a pull rod is arranged in the frame; the pull rod extends out of the bottom of the frame and is fixed with the workpiece chuck; and a tension sensor is arranged inside the workpiece chuck, and is electrically connected with a tension display device. In the microscopic welding micro-tensile measuring instrument, the new photoelectric technology and mechanical technology of the tension sensor are combined, so that the tension sensor becomes a new measuring instrument which combines optics, mechanics and electronics; and the tension sensor is arranged on the workpiece chuck, so that the friction and various resistances which are caused by driving the workpiece chuck to move up and down are prevented, the measuring accuracy of tension is improved, and the measurement on the tension of small workpieces is realized.

The invention discloses a light carbon fiber case integral forming manufacturing method. The light carbon fiber case integral forming manufacturing method comprises the following contents of pre-formation of guide rails and wedge-shaped parts; implementation of threaded installation holes, wherein the threaded installation holes are implemented through metal embedded parts, bottom installation holes are pre-machined in the metal embedded parts, and the metal embedded parts are precisely positioned on the forming surface of a case die through the pre-machined bottom installation holes; pre-formation of side face installation beams; case body lay-up; machining; surface metallization on the inner surface and the outer surface of the case body; and surface three-proofing treatment. According to the light carbon fiber case integral forming manufacturing method, reasonable split design is carried out, the guide rails, the wedge-shaped parts and side face connecting beams are pre-formed and then assembled with the case body die, overall case body lay-up and autoclave co-curing formation are carried out, the manufacturing difficulty is lowered, and the overall rigidity requirement of the case body is also ensured; many printed board assemblies need to be installed in the case body, a power supply component needs to be installed outside the case body, installation interfaces are many, the positions are compact, the high-precision requirement for installation positions and dimensions is met through the embedded part precise positioning technology, and the connecting strength is ensured.

The invention discloses a combined positioning method and system based on BD2 and a ground-based navigation system, and the method comprises the steps: S1, collecting and correcting a pseudo-range value of a BD2 satellite; S2, calculating the spatial position of the BD2 satellite after earth rotation correction; S3, collecting and correcting the distance from a ground station of the ground-based navigation system to a distance measurement machine; S4, initializing the position of an aircraft and a clock error of a satellite receiver; S5, building and solving a corresponding linear equation group; S6, updating the roots of the linear equation group; S7, judging whether the iteration is ended or not: calculating an iteration threshold value delta, and enabling the calculation result obtained at step S6 to serve as the current position of the aircraft and enabling the iteration to be ended if the delta is not greater than a preset threshold value; or else, repeatedly carrying out step S5-S7 till the iteration is ended. The invention also provides a system achieving the above method. The method and system can greatly improving the positioning precision of a system, are not dependent on GPS resources, can be used during wartime, and are high in reliability.

The invention discloses a wide-range high-precision narrow-linewidth optical fiber laser with an adjustable linewidth, which comprises two laser emitting devices, a wave combiner, a polarization controller and a nonlinear optical fiber. A tunable single-frequency laser seed source generates single-frequency optical fiber laser, an optical fiber amplifier amplifies the power of the single-frequencyoptical fiber laser, the wave combiner combines the two single-frequency optical fiber laser beams subjected to power amplification into one laser beam, the polarization controller adjusts the polarization state of the combined laser beam, and the nonlinear optical fiber is used for controlling the linewidth of the output laser. The power ratio of the two paths of laser beams injected into the nonlinear optical fiber is adjusted, and therefore, the gain in the nonlinear optical fiber is changed, the output laser linewidth is further controllable, the narrow-linewidth optical fiber laser finally has the advantages of being flexible and controllable in linewidth, large in adjusting range, high in linewidth adjusting precision and the like, and the narrow-linewidth optical fiber laser can beapplied to the aspects of an optical wavelength division multiplexing system, coherent combination, spectrum combination, gravitational wave detection and the like.

The invention provides a large missile-borne radar radome erecting platform. The platform comprises a lifting mechanism, a coarse adjustment mechanism matched with the lifting mechanism, a fine adjustment mechanism matched with the coarse adjustment mechanism and a mounting mechanism matched with the fine adjustment mechanism; a radome can be fixed to the mounting mechanism; the lifting mechanism can drive the coarse adjustment mechanism to change the height, the coarse adjustment mechanism can drive the fine adjustment mechanism to adjust the position in the horizontal plane, and the fine adjustment mechanism can drive the mounting mechanism to change the height. Rapid coarse adjustment of the position of the radome is achieved through the lifting mechanism and the coarse adjustment mechanism, the radome is moved to the designated position, then accurate adjustment of the position is conducted through the fine adjustment mechanism, the high-precision requirement for head cover matching can be met, the matched mounting mechanism can be replaced according to the type of the radome, the adaptability is high, and the equipment cost is obviously reduced.

The invention relates to a manufacturing method of a millimeter wave array antenna. The method comprises the following steps: a plastic base material of an antenna fragmentation model is obtained through an injection molding method; and metallization treatment is carried out on the surface of the plastic base material. According to the millimeter wave array antenna processing method, the manufacturability of the product is improved, and batch production is facilitated; the millimeter wave antenna cost is reduced, the product weight is reduced, and the transportation and installation difficultyand cost are reduced.

The utility model discloses an intelligent battery SOC management system and method based on a cloud platform. The system comprises a BMS system configured to collect operation parameters of a batterymodule and environmental parameters of the current equipment and upload the operation parameters and the environmental parameters to the cloud server, calculate a SOC value of the battery module according to the operation parameters of the battery module, receive a regulation and control instruction and a new correction coefficient issued by the cloud server, and correct the calculated SOC value;and a cloud server configured to receive the operation parameters of the battery module and the environmental parameters of the current equipment acquired by the BMS system, analyze and process the operation parameters and the environmental parameters, and establish a corresponding operation parameter and environmental parameter database, and judge whether the battery SOC parameters need to be re-corrected according to the operation parameters, issue the regulation and control instruction to the BMS system if the battery SOC parameters need to be re-corrected, re-adjust the correction coefficients according to the operation parameters of the battery module and historical operation parameter information thereof to obtain new correction coefficients, and issue the new correction coefficients to the BMS system.

A delay circuit includes a first buffer, a second buffer, a wire, and a selector. The first buffer is configured to buffer an input signal to generate the first intermediate signal. The second buffer is used for buffering the input signal to generate the second intermediate signal. The winding is used for delaying the first intermediate signal to generate a delayed signal. The selector is configured to select the delayed signal or the second intermediate signal as an output signal. According to the invention, high-precision time sequence delay can be realized by adjusting the winding length.

The invention relates to a battery management system, and discloses a current sampling circuit. The current sampling circuit comprises a collecting circuit, a switching circuit, a serial bus separation circuit and a signal buffering circuit; the collecting circuit is used for collecting a simulated current signal; the input end of the switching circuit is connected with the output end of the collecting circuit, and the switching circuit is used for switching the simulated current signal to a digital current signal; the input end of the serial bus separation circuit is connected with the outputend of the switching circuit, and the serial bus separation circuit is used for switching the digital current signal to a serial current signal conforming to a serial bus protocol; and the input endof the signal buffering circuit is connected with the output end of the serial bus separation circuit, the signal buffering circuit is used for buffering output of the serial current signal, the high-precision requirement of current sampling is achieved, and meanwhile, the production cost is lowered.