3 results about "Ranging" patented technology

The invention provides a method for determining a service range of a satellite-based augmentation system, which comprises the following steps of: selecting a target research area, resolving satellite augmentation orbit/clock correction and user difference ranging error information of a global navigation satellite system in a current epoch, calculating an orbit/clock correction comprehensive error of each satellite projected on a grid point in the current epoch, and determining the service range of the satellite-based augmentation system. Counting the UDRE envelope probability of grid points in a target area, calculating the delay error value of an ionosphere of the grid points and the vertical error information of the ionosphere of the grid, counting the GIVE envelope probability of the grid points in the target area, solving a union set for a public area under the integrity parameter envelope requirement, and determining a final SBAS service area. The union overlapped area is the final service area. On the basis of the requirement for avoiding the integrity risk event, the integrity parameter corrects the residual error of the corresponding correction with the 99.9% envelope probability to form the envelope, the processing method is reasonable, and the processing efficiency is high.

The invention discloses a space-ground combined orbit calculation method for navigation constellation measurement and control management. The method comprises: designing a space foundation whole network orbit calculation process for avoiding normal equation rank depletion, using a long-term forecast ephemeris as virtual observation for constraint, and combining traditional foundation S-band measurement data and a Ka inter-satellite link weighted fusion algorithm to calculate the space-ground combined orbit of the navigation constellation measurement and control management; and comprehensivelyprocessing traditional ground-based S-band tracking data and inter-satellite link bidirectional distance measurement to obtain a precise ephemeris product for supporting navigation satellite measurement and control management and inter-satellite link management.