467results about How to "Real-time positioning" patented technology

The invention provides a PPP-RTK positioning method based on a low-orbit constellation navigation augmentation system. The method includes the steps that direct transmission signals broadcasted by multi-system navigation satellites and low-orbit constellations are received to generate original observation data; navigation satellite augmentation information broadcasted by the low-orbit constellations and low-orbit satellite precise orbits and precise clock difference are received; precise point positioning is conducted by utilizing the navigation satellite augmentation information, the low-orbit satellite precise orbits and precise clock differences and the original observation data; or, when ground-based augmentation comprehensive error correction information is received, ground-based augmentation precise point positioning is conducted by comprehensively utilizing the navigation satellite augmentation information, the low-orbit satellite precise orbits and precise clock difference, theoriginal observation data and the ground-based augmentation comprehensive error correction information. By means of the method, near-real-time precise positioning, velocity measuring and timing results can be obtained in the globe, real-time centimeter-level positioning, velocity measuring and timing results can be obtained in ground-based augmentation regions, and seamless switching between ground-based augmentation regions and non-ground-based augmentation regions of the global region can be achieved.

The invention provides a real-time positioning method based on geomagnetic information. According to the method, an area positioning model is established based on WiFi signals in a positioning area, a geomagnetic path positioning model is established based on the geomagnetic information, and the current position of a user is estimated according to the established two models. According to the method, starting from the angle of multimode fusion, with the advantages of the geomagnet, the WiFi signals and an acceleration sensor being combined, and with the geomagnet, of which the signals are relatively stable, being the main body, accurate positioning is carried out within the range of a local area; with the WiFi positioning, of which the coverage area is relatively wide and the positioning accuracy is relatively poor, being the assist, the local search range for geomagnetic positioning is limited; and the acceleration sensor is utilized to judge the state of the user and the movement distance so as to determine whether to use the geomagnetic positioning method and determine the length of the geomagnetic track path for geomagnetic track matched positioning, so that indoor high-precision, low-power-consumption and real-time positioning can be realized.

The invention discloses an absolute grating ruler multi-track encoding method. In order to solve problems, such as the accumulative error of incremental encoding and the hardware complexity of absolute encoding, etc., in the micro-nano machining measurement process, the invention adopts an absolute encoding method based on p-element M-sequence pseudo-random codes suitable for single track and multiple tracks. The encoding method is suitable for a straight line absolute position encoder, and a disk absolute angle encoder, locating can be performed at any time, and the boot back-to-zero operation does not needed. Moreover, an incremental encoding strip is provided, so measurement accuracy can be improved by suing the phase segmentation method. The encoding method is an absolute position encoding method has advantages of easy generation, replication and processing, large encoding capacity, low decoding cost and macro-micro composite performance. The encoding method comprises ordinary single-track binary M-sequence absolute grating ruler straight-line encoding, a M-sequence disk encoder, code expanding method multi-code-channel pseudo-random code straight-line encoding and code expanding method p-element M-sequence pseudo-random codes, and the maximum encoding method is obtained by combing the above the encoding methods.