Angular Accuracy Calibration Method for Microwave Landing Simulator
A microwave landing and simulator technology, applied in the monitoring/testing of radio wave director, direction finder using radio waves, transmission monitoring, etc. Measurement of dynamic range limitations and other issues, to achieve the effect of strong operability, high measurement accuracy, and good traceability
Active Publication Date: 2020-09-22
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology
At present, the commonly used calibration method is to use a digital oscilloscope to test the time interval between the output of the simulator to and from the scanning pulse, and realize the angle measurement through calculation, which is limited by the dynamic range of the oscilloscope measurement.
This method can only realize the angle measurement of the high-power signal output by the microwave landing simulator, and cannot meet the angle calibration of the dynamic range of the simulator, that is to say, it cannot determine the angle performance of the simulator under the condition of outputting a low-power signal.
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[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, and the present invention includes but is not limited to the following embodiments.
[0023] The invention is based on a general measuring instrument. First, a device for calibrating the accuracy of the azimuth and elevation signals of the microwave landing simulator is constructed. The oscilloscope is used to collect the angle radio frequency signal of the reference power output by the simulator, and the envelope of the microwave landing signal is obtained through Hilbert transformation. The angle measurement principle and angular accuracy theory are used to calculate the angular accuracy of the output reference power signal of the simulator; then the vector signal analyzer is used to test the EVM characteristics of the dynamic range data signal of the simulator, and the phase noise test system is used to test the phase of the output carrier signal of the si...
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The invention provides a calibration method for the angular accuracy of a microwave landing simulator. According to the method, the phase noise of an output carrier signal and the EVM characteristicsof a data signal of a microwave landing simulator are measured, and then the signal-to-noise ratio of scanning signals is calculated and obtained. On the basis of the precision measurement on the output reference power azimuth and the elevation angle of the microwave landing simulator, the calibration on the angular accuracy of the microwave landing simulator within a dynamic range can be realized. The precision calibration problem for the azimuth angle and elevation angle signals of the microwave landing simulator within the dynamic range can be solved.
Description
technical field [0001] The invention belongs to a microwave landing system (Microwave Landing System, MLS), and is used for analyzing and calibrating the output azimuth angle and elevation angle signal accuracy of a microwave landing simulator. Background technique [0002] The microwave landing system is a kind of precision navigation equipment, and the microwave landing simulator is a special equipment for checking, testing and calibrating the microwave landing receiver, providing it with calibration instructions such as azimuth, elevation and radio frequency level. Important metric for landing simulators. At present, the commonly used calibration method is to use a digital oscilloscope to test the time interval between the back-and-forth scanning pulses output by the simulator, and realize the angle measurement through calculation, which is limited by the dynamic range of the oscilloscope measurement. This method can only realize the angle measurement of the microwave la...
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IPC IPC(8): G01S3/02H04B17/00
CPCG01S3/023H04B17/0085
Inventor 张建明张琦米正衡李林骆家强
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP