Precise low-latency GNSS satellite clock estimation

Abstract

A wide-lane ambiguity and a respective satellite wide-lane bias are determined for the collected phase measurements for each satellite (S804) for assistance in narrow-lane ambiguity resolution. Satellite correction data is determined for each satellite in an orbit solution based on the collected raw phase and code measurements and determined orbital narrow-lane ambiguity and respective orbital satellite narrow-lane bias (S808). A slow satellite clock correction is determined based on the satellite orbital correction data, the collected raw phase and code measurements, and clock narrow-lane ambiguity and respective satellite narrow-lane bias (S812). A low latency clock module or data processor determines lower-latency satellite clock correction data or delta clock adjustment to the slow satellite clock based on freshly or recently updated measurements of the collected raw phase measurements that are more current than a plurality of previous measurements of the collected raw phase measurements used for the slow satellite clock correction to provide lower-latency clock correction data (S814).

Description

technical field [0001] The present disclosure relates to methods and systems for providing satellite correction signals with accurate, low-latency Global Navigation Satellite System (GNSS) satellite clocks. Background technique [0002] In some prior art, a service provider provides correction signals to end users of satellite navigation receivers via wireless signals, such as satellite radio signals on the L-band of satellites. In a GNSS cluster, each satellite clock can have a satellite clock bias or clock error that can be measured with reference to the GNSS system clock time as well as other alternatives. The correction data contains the corresponding clock bias or clock solution for each satellite within the field of view or reception range at the end user's mobile receiver. The satellite clock bias with the corresponding satellite identifier is sent to the end user or subscriber of the satellite correction signal. There is a delay between the reference satellite rece...

AI Technical Summary

Problems solved by technology

For example, a satellite's estimated reference orbital position may be affected by clock bias or errors in the clock solution, which in turn may lead to errors or reduced accuracy in the satellite receiver's position solution

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