Laser compensation method for high-frequency linear phase detection of plane wave of compact range

Abstract

The invention discloses a laser compensation method for high-frequency linear phase detection of plane wave of a compact range. The laser compensation method comprises the following steps: building a three-dimensional rectangular coordinate system in a dark chamber of a compact range to be detected; determining an initial position of a scanning frame according to a relation between position of a feed source, position of a reflective surface and position of a test area; adjusting a vertical attitude angle and a horizontal attitude angle of the scanning frame and enabling phase detection trend to meet the requirement on the performance of the plane wave; arranging a laser target on a probe antenna of the scanning frame, arranging a laser tracking instrument between the scanning frame and the reflective surface, capturing the position of the laser target in real time by the laser tracking instrument to obtain position information and position deviation delta x of the scanning frame; obtaining a phase deviation result of the plane wave according to a relation between light speed, working frequency and phase, and compensating the deviation result into a phase detection result in real time. The laser compensation method can be used for meeting the requirements on phase detection of the plane wave of the compact range at the high frequency and improving the phase detection accuracy of the plane wave of the compact range.

Description

technical field [0001] The invention relates to a laser compensation method for high-frequency detection of a compressed field plane wave, phase line detection, and detection. Background technique [0002] Due to its high measurement accuracy and convenient use, the compact field has become a necessary equipment for high-precision measurement of radar target RCS characteristics, seeker tracking, stealth material performance, high-performance radar antenna and radome characteristics, etc. The compact field adopts a precise reflective surface, which can convert the spherical wave generated by the point source into a plane wave at a short distance. The most core index for evaluating the performance of the plane wave in the test area of ​​the compact field is the phase irregularity of the plane wave field. For the measurement of phase roughness, the most commonly used method at present is to set up a scanning frame in the test area, so that the scanning track of the scanning fra...

AI Technical Summary

Problems solved by technology

[0003] The current problem is that when the high-frequency performance of the phase is tested, if the mechanical plane of the probe installed on the scanning frame deviates from the phase plane such as the plane wave, it will cause a large error in the phase measurement. more pronounced when increasing

However, after the scanning frame is used many times, its own technical indicators will seriously deteriorate, and the detection cross-sectional size range of the compact field can reach 2m to 12m. In such a large area, the straightness index of the straight line trajectory of the probe movement can meet the frequency and wavelength to be measured. The technical requirement of 1% is very difficult to achieve in actual testing

Images