NAVIGATION SATELLITE SYSTEM POSITIONING INVOLVING THE GENERATION OF ADVANCED CORRECTION INFORMATION

摘要

The invention relates to generating regional tropospheric correction information for correcting observations useful for estimating phase ambiguities and/or a position of global or regional navigation satellite systems (NSS) receiver(s). For each of a plurality of reference stations, at least one troposphere correction parameter is estimated by evaluating NSS observation equations using i) precise satellite information or the information derived from the precise satellite information, and ii) received multiple-frequency-signals-based raw observations or a linear combination thereof. The regional tropospheric correction information is then generated based on the estimated troposphere correction parameter(s) per reference station, the tropospheric correction information comprising a regional tropospheric delay function(s) and coefficients representing a tropospheric delay affecting a NSS signal passing through the troposphere in a region of interest. The generated tropospheric correction information may then be sent to NSS receiver(s) and used by the receiver(s) for example to facilitate position determination.

主权项

1. Method, carried out by a computer or set of computers, for generating correction information, hereinafter referred to as “tropospheric correction information”, wherein the tropospheric correction information comprises information for correcting observations useful for estimating at least one of phase ambiguities and a position of at least one global or regional navigation satellite system receiver, hereinafter abbreviated as NSS receiver, the at least one NSS receiver being within the troposphere and on or above a region of interest of the Earth's surface, the method comprising:
for each of a plurality of reference stations in the region of interest, receiving raw observations, hereinafter referred to as “multiple-frequency-signals-based raw observations”, obtained by the reference station observing NSS multiple-frequency signals from a plurality of NSS satellites over multiple epochs; obtaining information, hereinafter referred to as “precise satellite information”, on:
the orbit position of each one of the plurality of NSS satellites, anda clock offset of each one of the plurality of NSS satellites, or information derived from the precise satellite information; for each of the plurality of reference stations, estimating at least one troposphere correction parameter by evaluating NSS observation equations using
the precise satellite information or the information derived from the precise satellite information, andthe received multiple-frequency-signals-based raw observations or a linear combination thereof; generating the tropospheric correction information, based on the estimated at least one troposphere correction parameter per reference station, wherein the tropospheric correction information comprises
at least one mathematical function, each of which being hereinafter referred to as “regional tropospheric delay function”, and its coefficients, hereinafter referred to as “regional tropospheric delay coefficients”,the at least one regional tropospheric delay function and its regional tropospheric delay coefficients representing a delay, hereinafter referred to as “tropospheric delay”, affecting a NSS signal passing through the troposphere in the region of interest; and
sending the generated tropospheric correction information.