Method and system for measuring rcs in outdoor fields

Abstract

The present invention discloses an oudoor field RCS measurement method, which comprises the steps of acquiring at least one group of echo signals, wherein any group of echo signals comprises a target intermediate-frequency (IF) echo signal and a scaling body IF echo signal; for any group of echo signals, conducting the analog-to-digital conversion on the target IF echo signal in the above group of echo signals to generate a first digital signal, conducting the analog-to-digital conversion on the scaling body IF echo signal in the above group of echo signals to generate a second digital signal; conducting the fast Fourier transformation on the first digital signal to obtain a first complex-quantity signal, obtaining a first electric field strength in accordance with the first complex-quantity signal; conducting the fast Fourier transformation on the second digital signal to obtain a second complex-quantity signal, obtaining a second electric field strength in accordance with the second complex-quantity signal; calculating a candidate RCS according to the first electric field strength and the second electric field strength; on the condition that only one group of echo signals is acquired, adopting the candidate RCS as a target RCS. According to the technical scheme of the invention, the phase noise and the attenuation in the oudoor field RCS, caused by the external interference, can be eliminated, so that the RCS measurement error is reduced.

Description

technical field [0001] The invention relates to the field of electromagnetic scattering, in particular to an outdoor field RCS measurement method and system. Background technique [0002] The existing outdoor field RCS (Radar Cross Section, radar cross-section) measurement often uses a low-pass filter to process the intermediate frequency signal to the baseband signal for calculation. The disadvantage of this method is that there are many links in the signal processing process, and it is easy to accumulate more error. In the case of slow signal acquisition and processing speed, the above methods are used more often. However, in the construction of a new type of large-scale outdoor RCS measurement field, the processing speed, resolution, bandwidth and other indicators of signal acquisition and processing equipment have been greatly improved, and it is completely possible to directly collect intermediate frequency echo signals and perform calculations. At this time, it is imp...

AI Technical Summary

Problems solved by technology

In the above method, the above-mentioned electric field strength of the target and the calibration body generated by multiple tests is irrelevant, and various active and passive interference inside and outside the test field will seriously affect the accuracy of the measured target RCS

[0004] Furthermore, when the existing outdoor field RCS measurement adopts the method of setting the standard multiple times for calibration, it is necessary to measure the echo signals of the target and the calibration body separately, and the calibration body must be continuously erected or removed, thus The measurement result is heavily dependent on the stability of the system, and the specific process of measurement cannot determine the final measurement result

Therefore, the above method cannot be used in a measurement environment that requires high stability and reliability.

Images