Patent ID: 11879985
Assignee: nan
Field: Measurement (Instruments)
Classification: CPC G  A | IPC A  G

Claim 10:
11. An irrigation monitoring system for monitoring a rotational position of a center pivot irrigation system in a field, comprising:
a GNSS receiver for receiving GNSS coordinates at a plurality of points along a circular arc traversed by the center pivot irrigation system; and
means for processing said GNSS coordinates to determine center coordinates of a center pivot point of the center pivot irrigation system and the rotational position of the center pivot irrigation system using spherical coordinates;
wherein said means for processing said GNSS coordinates is programmed for calculations based on a geometric relationship for a cone inscribed in a sphere, with the sphere representing the Earth, the GNSS coordinates defining points along a base perimeter of the cone, and an apex of the cone being located at the center of the Earth; and
wherein said means for processing said GNSS coordinates uses a regression model that relates an angle Ω between a slant height and center height of the cone to the center coordinates and the GNSS coordinates for points along the base perimeter of the cone.