3 results about "Ionosphere" patented technology

The invention relates to a short wave communication reliability evaluation method based on multi-system detection data. The method comprises the steps of: calculating reflection point positions of a short wave communication link and all detection links, and selecting detection link data close to the reflection point position of an ionized layer of the short wave communication link; according to the determined reflection point positions of ionized layers of the detection links and the determined detection link data, forecasting an ionized layer parameter of reflection points of the ionized layers of the detection links; according to the determined reflection point positions of the ionized layers of the short wave communication link and the detection links and the forecasted ionized layer parameter of the reflection points of the ionized layers of the detection links, reconstructing an ionized layer parameter of the reflection point of the ionized layer of the short wave communication link; forecasting the highest available frequency of the short wave communication link by using a short wave propagation forecasting method according to the obtained ionized layer parameter; and calculating the received field intensity when the short wave communication link adopts the highest available frequency for communication according to the obtained highest available frequency, and analyzing the reliability of the short wave communication link.

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 GNSS troposphere wet delay estimation method and system, equipment and a medium, and the method comprises the following steps: obtaining observation values of different frequency points, and forming an ionosphere-free combination observation equation in each epoch; performing Kalman filtering state updating and observation updating according to the prior ZWD random walk parameters to obtain an unknown variable forecast value and a variance covariance matrix shown in the description of the unknown variable forecast value; calculating mathematical expectations when given priori ZWD random walk noise and observation noise; using the mathematical expectation as a pseudo observation value, and estimating a new ZWD random walk parameter by using data in a sliding window; and updating the priori ZWD random walk parameter by using the new ZWD random walk parameter. According to the method, random model parameters changing along with time can be estimated in real time, and the troposphere wet delay estimation value can be improved.