GROUND-BASED SYSTEM AND METHOD TO EXTEND THE DETECTION OF EXCESSIVE DELAY GRADIENTS USING DUAL PROCESSING

摘要

A processing module to monitor a horizontal delay gradient in satellite signals is provided. The processing module includes a dual-processing-satellite-differencing module, a double differencing module, and a gradient estimator module. The dual-processing-satellite-differencing module is operable to: receive carrier phase measurements for at least two satellites from at least two reference receivers; implement a first processing mode to normalize first satellite differences between +λ/2 and −λ/2; implement a second processing mode configured to normalize second satellite differences between 0 and λ; and select for further processing one of: data indicative of the first satellite differences processed according to the first processing mode; and data indicative of the second satellite differences processed according to the second processing mode. The double differencing module forms double-differences based on the selected data input from the dual-processing-satellite-differencing module. The gradient estimator module estimates a magnitude of the horizontal delay gradient.

主权项

1. A processing module to monitor a horizontal delay gradient in satellite signals, the processing module comprising:
a dual-processing-satellite-differencing module operable to:
receive carrier phase measurements for at least two satellites from at least two reference receivers, the at least two satellites including a monitored satellite and at least one other satellite, wherein the at least two reference receivers have a known geometric relationship to each other; andimplement a first processing mode to normalize first satellite differences between +λ/2 and −λ/2;implement a second processing mode configured to normalize second satellite differences between 0 and λ; andselect for further processing one of: data indicative of the first satellite differences processed according to the first processing mode; and data indicative of the second satellite differences processed according to the second processing mode; a double differencing module configured to form double-differences between one or more pairs of the at least two reference receivers based on the selected data input from the dual-processing-satellite-differencing module; and a gradient estimator module configured to estimate a magnitude of the horizontal delay gradient based on averaged compensated double-differences for the monitored satellite.