Randomized surface reflector

摘要

A metal plate of small, reflective cells of varying, random (within a limited rage) heights that reflect radio frequency energy such that individual reflective paths are of random length, adding neither constructively nor destructively, and thus not creating a standing wave condition between the reflective plate and the emitter or receiver is disclosed.

主权项

1. A method of calibrating a radiometer, comprising:
determining the attributes of a feed horn of the radiometer; constructing a randomized surface reflector based on the attributes of the feed horn, wherein the randomized surface reflector is comprised of a plurality of cells arranged on a plate, each cell having a randomly determined height above a baseline; obtaining an actual temperature of the feed horn; placing the randomized surface reflector adjacent to the feed horn so that the randomized surface reflector reflects the electromagnetic signals of the feed horn; measuring the radiometric temperature of the feed horn based on a signal reflected from the calibration surface; replacing the randomized surface reflector with an object of known temperature; measuring the temperature of the object of known temperature based on the signal emitted from the object; and calculating a calibration coefficient for the radiometer based on the actual temperature of the feed horn, the measured temperature of the feed horn, the actual temperature of the object, and the measured temperature of the object.