Inspection robot including sensor groups operated with calibration sets

A method for inspecting an inspection surface using an inspection robot, comprising:

• operating a first group of ultrasonic sensors with a first calibration set;
• and
• operating a second group of ultrasonic sensors with a second calibration set,
• wherein the first group of ultrasonic sensors is included in a first sled assembly of a payload for the inspection robot, and the second group of ultrasonic sensors is included in a second sled assembly of the payload for the inspection robot;
• wherein the first group of ultrasonic sensors is at a first characteristic vertical position on the first sled assembly, and the second group of ultrasonic sensors is at a second characteristic vertical position on the second sled assembly;
• and
• wherein the first calibration set includes a same calibration as the second calibration set, and the second group of ultrasonic sensors provides inspection data that is redundant with inspection data provided by the first group of ultrasonic sensors.