Method for improving temperature compensation measurement accuracy of microwave power meter and system thereof

Abstract

The invention discloses a method for improving temperature compensation measurement accuracy of a microwave power meter and a system thereof, and the method comprises the steps: obtaining the standard power of a preselected temperature compensation power point under each path of a multi-way switch, and constructing a calibration rule according to the corresponding relation between the standard power and the output power of a signal source; according to the path where the probe of the microwave power meter to be compensated is located, adopting the calibration rule of the corresponding path to adjust the signal source output power, and according to the adjusted signal source output power, obtaining the compensation calibration value of the probe of the microwave power meter to be compensated at the current temperature. Each path is calibrated, the output power of the signal source is adjusted to ensure that the power value entering the microwave power meter is accurate, the error caused by the difference of each switching path is eliminated, the temperature compensation measurement accuracy of the microwave power meter is improved, and the compensation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of temperature compensation, in particular to a method and system for improving the temperature compensation measurement accuracy of a microwave power meter. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Since the detection circuit of the peak probe and the logarithmic amplifier after detection are temperature-sensitive devices, the ADC (Analog to Digital Converter) value measured at different temperatures with the same input power deviates greatly. In order to solve this kind of deviation, it is necessary to carry on the temperature compensation to the microwave power sensor. [0004] The existing microwave power probe temperature compensation system adopts the power division method. For example, in the Chinese patent CN107561355A, it is disclosed that the temperature ...

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Problems solved by technology

[0005] However, due to the differences in the paths of the multi-way switch, the power values ​​entering the microwave power sensor through the various paths of the multi-way switch will be inconsistent, that is, the power value entering the microwave power sensor will be affected by the differences in the paths of the multi-way switch. The division method does not compensate for the difference, resulting in a maximum difference close to 1.5dB, resulting in a certain error in the temperature compensation data, which affects the measurement accuracy of the temperature response of the microwave power meter, and the accuracy is poor. Power measurement accuracy ±0.2dB

[0006] Furthermore, at the temperature point, when collecting data at each standard power point, a standard power meter is required for real-time approximation, which takes a long time to compensate and low efficiency. In the case of compensating 10 probes at a time, the data collection time is about 4 hours

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