80 results about "Relative precision" patented technology

The invention relates to a method for aiding the setting of the barometric altitude of an aircraft equipped with a means (11, 12) for determining the altitude not using the barometric pressure, determining with the aid of the means (11, 12) for determining the altitude an altitude (Zv, Zi, Zr, Zh) and its relative precision (Pzv, Pzr), comparing the determined altitude (Zv, Zi, Zr, Zh) with a barometric altitude measured aboard the aircraft, generating an alert when the discrepancy between the determined altitude (Zv, Zi, Zr, Zh) and the measured barometric altitude exceeds a predefined value and proposing a barometric altitude setting value.

The inertial system for gravity difference measurement uses COTS nano accelerometer and a strapdown Global Navigation Satellite System (GNSS)-aided inertial measurement unit (IMU). The former has low measurement noise density, while the latter is used to analytically stabilize the platform. Stochastic modeling of the gravity anomaly is utilized (as opposed to the deterministic modeling of causes and effects) to simplify the algorithm. The algorithm aims at finding relative changes between points, as opposed to absolute values at the points, which allows for high relative precision required in many applications.

This invention relates generally to semiconductor manufacturing and packaging and more specifically to semiconductor manufacturing in MEMS (Microelectromechanical systems) inertial sensing products. Embodiments of the present invention improve pressure sensor performance (e.g., absolute and relative accuracy) by increasing pressure insensitivity to changes in thermo-mechanical stress. The pressure insensitivity can be achieved by using the array of pressure sensing membranes, suspended sensing electrodes, and dielectric anchors.

The invention relates to a middle combined clamping tool for welding front assemblies of inner plates of left and right side walls of an automobile. The middle combined clamping tool for welding frontassemblies of inner plates of left and right side walls of the automobile comprises a middle supporting device, a side plate supporting device, a middle accessory positioning and pressing device anda right accessory positioning and pressing device; and the middle accessory positioning and pressing device and the right accessory positioning and pressing device are successively distributed on theright side of the middle supporting device. The middle complicated structures of the front assemblies of the inner plates of the left and right side walls of the automobile are designed specially, bythe tool, all components involved in the middle can be clamped and positioned, relative precision of the various components is ensured, the space utilization rate is high, and the production and manufacturing cost is reduced. In addition, automated welding treatment of an external welding robot is facilitated, the production efficiency and the quality of products are greatly improved, the degree of automation is high, and batched production and machining are realized favorably.

The present invention discloses an optical path control system and an optical module. The system comprises a focusing lens and an optical path acting assembly; the focusing lens is used for converging light beams passing through the focusing lens; the optical path acting assembly is used for controlling the transmission direction of the light beams; and when a plurality of incident light beams pass through the optical path acting assembly and the focusing lens sequentially, the optical path acting assembly converges the plurality of incident light beams, and the focusing lens converges each incident light beam into a light spot. According to the optical path control system and the optical module of the present invention, the intervals of the light beams can be adjusted through the functions of the optical path acting assembly and the focusing lens, and therefore, the structure of the optical path control system is simple, the number of optical path devices is reduced, the size of the whole optical path control system is greatly reduced, and thereby, the size of the whole optical module can be reduced; the relative positions of the focusing lens and the optical path acting assembly can be fixed easily, and therefore, the relative accuracy of focusing positions is improved; and the optical path acting assembly can be designed independently to realize independent control on the light beams, and the transmission direction and focusing point of each light beam can be independently controlled, and therefore, the degree of adjustment freedom is high.

The invention discloses a scene information integration method based on an internet GIS (Geographic Information System), and belongs to the field of the optimization analysis of communication networks. The scene information integration method based on the internet GIS comprises the following step: based on an internet map as an integration basis, by using ground object point information as an analytical factor, using a data structure as a guide, and comprehensively considering the relative timeliness of the updating of internet data and the relative precision of the internet data, carrying out scene information integration based on the internet GIS; the scene information integration method based on the internet GIS comprises the main content of two parts, i.e., the obtaining of the data of the internet GIS and scene classification, and data analysis and integration. By using the scene information integration method based on the internet GIS, the difficulty of obtaining the precise data of the GIS in a development process of the GIS is greatly decreased; the development process of the GIS is simplified; meanwhile, the precise data basis is provided for the optimization analysis-scene analysis of a network.

The invention relates to a track measurement data integral adjustment method based on a track geometrical state measuring instrument. According to the method, overall adjustment processing is carriedout on observation data of a total station free station and a track geometrical state measuring instrument prism; the problem that corners or abrupt changes are formed between adjacent observation stations due to independent adjustment processing of track measurement data according to an existing single observation station is solved, the influence of free station setting errors on track substationmeasurement is weakened, the relative precision between the adjacent observation stations is improved, and accurate measurement of the geometric state of the track is achieved.