Method for reducing uncertainty of radar photoelectric difference calibration

Abstract

The invention relates to the technical field of radar angle measurement, in particular to a method for reducing uncertainty of radar photoelectric difference calibration. The method comprises the following steps: 1) telescope alignment: in a positive mirror state, a radar antenna is aligned with a calibration source, an electric mark on a tower is automatically tracked at the positive image position of the antenna, and azimuth and pitch angle values displayed on a radar PDU are recorded; a person A observes and directs a person B to rotate the antenna through a telescope, the center of a radarcross scribed line coincides with the center of a cursor at the positive image position of the antenna, and an angle value displayed on a radar PDU is recorded; 2), telescope inversion, wherein the radar antenna is aligned with the calibration source in the inverted mirror state, the step (1) is adopted at the inverted image position of the antenna, the center of a radar cross scribed line coincides with the center of a cursor at the inverted image position of the antenna, and an angle value is recorded, and 3), the photoelectric difference KZ and the photoelectric difference Kn are calculated through a formula.

Description

technical field [0001] The invention relates to the technical field of radar angle measurement, in particular to a method for reducing the calibration uncertainty of radar photoelectric difference. Background technique [0002] Photoelectric difference is a systematic error that needs to be corrected in the process of radar angle measurement, which is defined as "the degree of non-parallelism between the electrical axis and the optical axis of the radar, expressed by the deviation angle between the two". The photoelectric difference can be divided into azimuth error K according to the direction that the electric axis deviates from the optical axis A and pitch error K E . Uncertainty is defined as: due to the existence of measurement errors, the degree of uncertainty of the measured value, in the process of calibrating the radar photoelectric difference, the measuring instrument and calibration method will affect the uncertainty. The currently used method of calibrating th...

AI Technical Summary

Problems solved by technology

During the process, due to the servo system not correcting the angle and the effect of the braking force, the antenna angle will change, the range is about 0.003°~0.005°, the direction is random, and the antenna angle changes. As a result, when reading the cursor deviation, the antenna does not change. It is really aligned with the electric axis and the angle of deviation is relatively large, resulting in the introduction of data dispersion during photoelectric difference calibration

[0012] 2) Data interpretation is difficult, leading to large interpretation errors

[0013] When observing the cursor through a telescope, because the scale lines are dense, the cursor size is large, and usually the cursor deviates far from the center of the telescope cross scale, so a certain deviation will be caused during the observation process, and it is difficult to accurately distinguish the exact scale corresponding to the cursor center value

Coupled with the fading of the cursor and the unclear scale of the telescope, it is very easy to introduce a large interpretation error when reading

[0014] like figure 1 As shown, the interpretation error can easily bring large dispersion to the calibration data

Images