US 12,270,967 B2
Field calibration of reference weather stations
Michael Dormody, San Jose, CA (US); Guiyuan Han, San Jose, CA (US); Badrinath Nagarajan, Cupertino, CA (US); Wei Liu, San Jose, CA (US); Prashant Dave, Rajasthan (IN); and Arun Raghupathy, Bangalore (IN)
Assigned to NextNav, LLC, Sunnyvale, CA (US)
Filed by NextNav, LLC, Sunnyvale, CA (US)
Filed on Nov. 7, 2022, as Appl. No. 18/053,254.
Claims priority of provisional application 63/264,119, filed on Nov. 16, 2021.
Prior Publication US 2023/0152489 A1, May 18, 2023
Int. Cl. G01W 1/18 (2006.01); G01W 1/02 (2006.01); G01W 1/10 (2006.01); G01L 27/00 (2006.01)
CPC G01W 1/18 (2013.01) [G01W 1/02 (2013.01); G01L 27/002 (2013.01); G01W 1/10 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A method comprising:
collecting, by a processor, simultaneous pressure data at a first reference weather station and a second reference weather station for multiple time points, wherein the first reference weather station and the second reference weather station have been deployed in an operational environment, and the first reference weather station has a higher reliability and is less prone to sensor drift relative to the second reference weather station;
calculating, by the processor, pressure differences between pairs of simultaneous data points of the collected pressure data;
for each time point, estimating, by the processor, a pressure gradient for a region that encompasses the first reference weather station and the second reference weather station;
determining, by the processor, a distance between the first reference weather station and the second reference weather station;
for each time point, determining, by the processor, a pressure gradient difference between the first reference weather station and the second reference weather station based on the pressure gradient and the distance between the first reference weather station and the second reference weather station;
for each time point, obtaining, by the processor, a pressure difference offset for one of the data points of the pair of simultaneous data points based on the pressure gradient difference and the pressure difference;
determining, by the processor, an average pressure difference offset between the first reference weather station and the second reference weather station by averaging the pressure difference offsets for the pairs of simultaneous data points; and
calibrating, by the processor, the second reference weather station using the average pressure difference offset.