RCS testing background compensation system and method

Abstract

The invention discloses an RCS testing background compensation system and method. The RCS testing background compensation system and method can lower background RCS and achieve high-precision RCS testing of a target object. The compensation system comprises a signal emitting unit, a signal receiving and processing unit and a compensation body. The signal emitting unit comprises an emitting circuit and an emitting antenna. The emitting circuit is used for generating testing signals. The emitting antenna is used for emitting the testing signals generated by the emitting circuit. The signal receiving and processing unit is used for receiving the scattered signals of the testing signals and processing RCS measured through display of the scattered signals. The compensation body is arranged in the side lobe direction of the emitting antenna and used for eliminating the background RCS. An RCS testing compensation testing system is improved, the auxiliary compensation body is arranged, influence on the RCS testing from the background scattered signals is compensated and lowered, and therefore the high-precision RCS testing of the target object can be achieved.

Description

technical field [0001] The invention belongs to the technical field of RCS testing, and relates to a background cancellation system and method in RCS testing, in particular to the design of a compact field and far field RCS background cancellation system and method. Background technique [0002] In RCS test technology, in order to reduce the influence of background scattering signals on the test, it is usually necessary to build a special microwave anechoic chamber, or to conduct tests in an open field. Background cancellation processing can further improve the measurement accuracy. When testing the RCS of the target object in the compact field and the far field, the commonly used method to eliminate the background RCS is to use the internal feedback of the transmitted signal to generate a signal of equal amplitude and anti-phase with the background RCS, and cancel the two to eliminate the background RCS. However, this method can only achieve cancellation for continuous wav...

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Problems solved by technology

However, this method can only achieve cancellation for continuous waves. The feedback signal and the scattered signal do not arrive at the same time in time, and it is impossible to cancel the pulse signal. The delay line can adjust the delay time of the signal, but the adjustment of the delay line is very troublesome. If This RCS cancellation method can be improved to ensure that the equal-amplitude and anti-phase pulse signal can also be canceled, and the RCS cancellation test method will have a broader application prospect

[0003] At present, when testing the RCS of the target object, the target object is usually not placed at first, the transmitting antenna transmits the signal to irradiate the background environment and is received by the receiving antenna, and then adjusts the signal feedback to generate a signal of equal amplitude and anti-phase with the background scattering, and then conducts the standard object Calibrate, and finally put the target object back to the test point, and then transmit the signal through the transmitting antenna to irradiate the target object and the background environment and receive it through the receiving antenna. This method is used to eliminate the background RCS in the target RCS test. However, if the two signals of equal amplitude and anti-phase are pulse signals, this method cannot guarantee that the two signals can be matched and canceled at the time point. Therefore, within a certain range, use This method cannot achieve background cancellation for pulsed RCS testing

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