6results about How to "Achieve direct access" patented technology

The application discloses a multi-core cache consistency debugging method based on multi-view access and belongs to the field of multi-core processor debugging. The method is characterized in that a target address is specified in a main memory by a host computer through a JTAG debugging interface, five groups of data of CPU view, L1 data cache view, L1 instruction cache view, L2 view and real memory view corresponding to the address are read in turn, whether cache is invalid is judged by comparing data consistency, and a cache level inconsistent is marked. The debugging system comprises a built-in JTAG TAP controller, an enhanced debugging access module, a storage level access arbitrator and a data and state collector. The application realizes direct access of the JTAG interface to data of each level of cache, does not need to modify hardware or disable cache, does not interfere with system operation, can quickly locate cache consistency problems under a multi-core architecture, improves debugging efficiency and accuracy, and is suitable for debugging scenes of large-scale multi-core processors.

The application relates to a multi-constant star and optical satellite integrated global positioning device and method, wherein the device comprises: an integrated star-satellite angle measurement system, which is used for simultaneously observing at least two constant stars and a low-orbit satellite carrying an infrared light source by using the same field of view, so as to obtain an optimal inertial system attitude of the multi-constant star and optical satellite integrated global positioning device based on second vector information; an infrared pulse optical data receiving system, which is used for observing an infrared optical code to obtain position information of the low-orbit satellite; and an embedded microprocessor, which is used for performing data processing to obtain positioning information of the multi-constant star and optical satellite integrated global positioning device. Therefore, the technical problem that related technologies need additional auxiliary sensors to realize high-precision global positioning, the structure of a positioning device is complex, the cost is high, and the precision and sensitivity of the auxiliary sensors are influenced by various factors, thereby influencing the global positioning result is solved.

This invention discloses a dynamic calibration device for a frequency-adjustable variable cross-section gas flow meter, belonging to the field of gas flow metering technology. The device includes a variable frequency motor, a rotary valve, a fan, a rectifier, a stabilizing section, a contraction section, a development section, and a testing section connected in sequence. The rotary valve consists of a stator and a rotor; the rotor rotation causes the flow cross-sectional area to change sinusoidally, generating a standard sinusoidal flow signal. The variable frequency motor is used to adjust the rotor speed, achieving precise control of the signal frequency. The fan provides suction power. The rectifier, stabilizing, contraction, and development sections are used to ensure the airflow reaches a fully developed laminar flow state. The testing section measures the pressure gradient using a dynamic pressure sensor. This invention also provides a method for obtaining a standard volumetric flow signal by solving the analytical solution of the Navier-Stokes equations based on the pressure gradient. This device solves the problems of difficulty in controlling the generation of dynamic flow signals and the difficulty in directly tracing the source of standard flow, achieving high-precision calibration of the dynamic characteristics of the gas flow meter.

The invention discloses an earth surface microtopography extraction method and device based on vegetation coverage conditions, and the method comprises the steps: uniformly distributing control points at two sides of an observation region through the control point function of Agisoft Metashape software, obtaining the coordinates of each control point, setting the origin of the coordinates, carrying out the photographing to obtain an image data set, and carrying out the extraction of the earth surface microtopography; agisoft Lens open source software is used to automatically correct distorted photos of the image data set to obtain a corrected image data set and export a correction coefficient, photo alignment is carried out to generate sparse point clouds, camera alignment optimization is carried out according to the sparse point clouds and the control point coordinates to obtain dense point clouds, and the dense point clouds are subjected to image alignment optimization. And performing high-precision classification on the dense point clouds according to the HSV value to obtain classified point clouds, selecting the classified point clouds of which the point cloud distribution category is the ground, and performing interpolation to generate a digital elevation model, thereby realizing direct acquisition and processing of the slope surface microtopography DEM under the vegetation coverage condition, reducing the influence of vegetation on surface microtopography extraction, and improving the extraction efficiency of the slope surface microtopography. And the detection of the microtopography change process under the vegetation coverage condition is enhanced.

This application discloses a flow velocity tube, comprising: a tube body, which is a hollow tubular structure, comprising an inlet section, a contraction section, a measuring section, and a diffusion section in sequence along the fluid flow direction, wherein the inner cavities of the inlet section, contraction section, measuring section, and diffusion section are connected to form a main channel for fluid flow; a measuring element disposed in the measuring section of the tube body, the measuring element having a front end face facing the inlet section and a rear end face facing away from the inlet section, the front end face having a total pressure tapping hole, and the rear end face or outer peripheral wall having a static pressure tapping hole; wherein, the measuring element has an independent and parallel extending total pressure channel and a static pressure channel inside, the total pressure channel being connected to the total pressure tapping hole and extending to the outside of the measuring element to connect to a pressure sensor, the static pressure channel being connected to the static pressure tapping hole and extending to the outside of the measuring element to connect to a pressure sensor, the total pressure channel and the static pressure channel transmitting total pressure signal and static pressure signal respectively, for calculating the pressure difference or flow rate of the fluid.

The application discloses a vehicle-mounted network disk audio playing method and device, a storage medium and a vehicle, relates to the technical field of vehicle-mounted audio playing, and comprises the following steps: detecting that a user starts a vehicle-mounted network disk audio application, determining a vehicle-mounted network disk selected by the user based on a preset vehicle-mounted network disk adaptive interface, and determining the authorization state of the vehicle-mounted network disk; in response to the fact that the vehicle-mounted network disk is successfully authorized, acquiring audio resources in the vehicle-mounted network disk; and determining first audio resources to be played from the audio resources according to the current vehicle-mounted network state. The application realizes direct data interaction between a vehicle machine and a vehicle-mounted network disk, breaks the limitation that the prior art does not extend to a vehicle-mounted scene, lays a foundation for subsequent convenient operation and stable playing, does not require the user to copy files to a local storage device in advance, completely breaks through the limitation of the local storage capacity, reduces network consumption of online playing at the same time, guarantees playing stability, and solves the pain points of unstable playing and dependence on a network.