Natural poikilothermia intelligent positioning system for foundation microwave radiometer

Abstract

The invention discloses a natural temperature varying intelligent calibration system of ground-based microwave radiometer, which is composed of a micro radiometer, a natural temperature varying calibration load, a platinum resistance thermometer, a thermometric instrument, a voltage collecting card and a computer. The calibration load comprises a metal box, a foam box, liquid nitrogen, a metal plate, an absorber and a conformal cover, wherein the foam box is in the metal box, the absorber is at the bottom of the foam box, which bottom is mounted with the conformal cover and upper is mounted with the porous metal plate. The invention is characterized in that the microwave radiometer is arranged at the lower of the calibration load and the microwave calibration load is calibrated by measuring the temperature of the calibration load from liquid nitrogen temperature to room temperature, the invention uses automatic measurement control technique to automatically measure the indexes of the microwave radiometer as sensitivity, linearity, stability, accuracy and integration time, with simple operation and high efficiency.

Description

technical field [0001] The invention belongs to the fields of microwave remote sensing, microwave guidance and precision measurement, and in particular relates to a naturally variable temperature intelligent calibration system for a ground-based microwave radiometer. Background technique [0002] Microwave radiometer is a high-sensitivity receiver that can measure the microwave radiation energy of objects. It has the ability to work all day and all day, and the equipment is simple, easy to integrate, and has good concealment. Therefore, it is widely used in remote sensing, guidance, precision measurement and other fields. Applications are increasingly widespread. But one of the main problems in the actual work of the microwave radiometer is the lack of effective calibration equipment and calibration methods. [0003] Calibration of a microwave radiometer refers to the establishment of the relationship between the output parameters of the radiometer (usually voltage) and the...

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Problems solved by technology

[0008] This calibration method of separating the receiver and the antenna has the following problems: First, in the receiver calibration process, if the mismatch is not considered, the calibration accuracy is not high

[0013] This calibration method has the following three problems: a) The cold calibration source prototype designed by Hardy, because the radiometer horn radome is on the upper part of the cooling calibration load, the liquid nitrogen will be released from the polyurethane foam material Volatilizes out of the hole in the horn antenna, causing frost on the horn antenna

In the past, the test of this indicator was completed with the help of a data recorder, and manual calculation was performed afterwards, which was neither accurate enough nor completed in real time.

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