Methods for generating accuracy information on an ionosphere model for satellite navigation applications
First Claim
1. Method, carried out by a computer or set of computers, for generating accuracy information for an ionosphere model calculated using a parameter estimation procedure based on phase observations made using a plurality of ground stations, whereineach phase observation is obtained from at least two signals transmitted from a satellite to a ground station, each of the at least two signals having a different frequency, andthe accuracy information is usable in a GNSS positioning system for estimating a position of a rover,the method comprising the steps of:
- for each of at least some of the phase observations having fixed or converged ambiguities,obtaining phase residual information of the parameter estimation procedure; and
computing coordinates of a pierce point on a sphere around the earth, the sphere being defined by an ionosphere single layer model, wherein the coordinates indicate where the at least two signals from which the phase observation has been obtained pierce the sphere;
mapping, for each pierce point, the phase residual information of the corresponding phase observation to the vertical at the pierce point to generate vertical residual information;
for each of at least some of the points of an equidistant grid on the sphere, each point being hereinafter referred to as “
grid point”
, identifying pierce points within a threshold distance from the grid point on the sphere;
selecting grid points for which the number of identified pierce points exceeds a threshold number;
computing, for each selected grid point,vertical accuracy information at the selected grid point based on the vertical residual information of the identified pierce points, anda scale factor based on the vertical accuracy information computed for the selected grid point; and
generating the accuracy information for the ionosphere model based onthe vertical accuracy information computed for the selected grid points, andan overall scale factor computed based on the computed scale factors.
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Abstract
Accuracy information for an ionosphere model is generated. Phase residual information of a parameter estimation procedure is obtained and coordinates of pierce points are computed on a sphere around the earth. The coordinates indicate where signals pierce the sphere. Phase residual information is mapped for each pierce point. A grid of equidistant points is put on the sphere and the pierce points are identified. For each selected grid point, vertical accuracy information is computed based on vertical residual information, and a scale factor is computed based on the vertical accuracy information. The accuracy information for the ionosphere model is generated based on the vertical accuracy information computed for the selected grid points and an overall scale factor computed based on computed scale factors.
9 Citations
20 Claims
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1. Method, carried out by a computer or set of computers, for generating accuracy information for an ionosphere model calculated using a parameter estimation procedure based on phase observations made using a plurality of ground stations, wherein
each phase observation is obtained from at least two signals transmitted from a satellite to a ground station, each of the at least two signals having a different frequency, and the accuracy information is usable in a GNSS positioning system for estimating a position of a rover, the method comprising the steps of: -
for each of at least some of the phase observations having fixed or converged ambiguities, obtaining phase residual information of the parameter estimation procedure; and computing coordinates of a pierce point on a sphere around the earth, the sphere being defined by an ionosphere single layer model, wherein the coordinates indicate where the at least two signals from which the phase observation has been obtained pierce the sphere; mapping, for each pierce point, the phase residual information of the corresponding phase observation to the vertical at the pierce point to generate vertical residual information; for each of at least some of the points of an equidistant grid on the sphere, each point being hereinafter referred to as “
grid point”
, identifying pierce points within a threshold distance from the grid point on the sphere;selecting grid points for which the number of identified pierce points exceeds a threshold number; computing, for each selected grid point, vertical accuracy information at the selected grid point based on the vertical residual information of the identified pierce points, and a scale factor based on the vertical accuracy information computed for the selected grid point; and generating the accuracy information for the ionosphere model based on the vertical accuracy information computed for the selected grid points, and an overall scale factor computed based on the computed scale factors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Processing entity, for generating accuracy information for an ionosphere model calculated using a parameter estimation procedure based on phase observations made using a plurality of ground stations, wherein
each phase observation is obtained from at least two signals transmitted from a satellite to a ground station, each of the at least two signals having a different frequency, and the accuracy information is usable in a GNSS positioning system for estimating a position of a rover, the processing entity comprising: -
an obtaining unit configured to, for each of at least some of the phase observations having fixed or converged ambiguities, obtain phase residual information of the parameter estimation procedure; and compute coordinates of a pierce point on a sphere around the earth, the sphere being defined by an ionosphere single layer model, wherein the coordinates indicate where the at least two signals from which the phase observation has been obtained pierce the sphere; a mapping unit configured to map, for each pierce point, the phase residual information of the corresponding phase observation to the vertical at the pierce point to generate vertical residual information; an identifying unit configured to, for each of at least some of the points of an equidistant grid on the sphere, each point being hereinafter referred to as “
grid point”
, identify pierce points within a threshold distance from the grid point on the sphere;a selecting unit configured to select grid points for which the number of identified pierce points exceeds a threshold number; a computing unit configured to compute, for each selected grid point, vertical accuracy information at the selected grid point based on the vertical residual information of the identified pierce points, and a scale factor based on the vertical accuracy information computed for the selected grid point; and a generating unit configured to generate the accuracy information for the ionosphere model based on the vertical accuracy information computed for the selected grid points and an overall scale factor computed based on the computed scale factors. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification