Signal processing method for improving background subtraction technology in different-place continuous calibration RCS (Radar Cross-Section) measurement

Abstract

The invention provides a signal processing method for improving a background subtraction technology in different-place continuous calibration RCS (Radar Cross-Section) measurement. The method comprises the following steps: step 1, measuring test field background return SBC (f, t1) containing a calibration bracket at time t1; step 2, installing a calibration object and measuring calibration object return SC (f, t2) at time t2; step 3, measuring test field background return SBT (f, t3) containing a target bracket at time t3; step 4, installing a target and measuring target return ST (f, t4) at time t4; step 5, extracting time-varying transmission function parameters and carrying out amplitude-phase correction, background phase subtraction and target RCS calibration treatment. Different from traditional RCS measurement and calibration treatment model, the novel model disclosed by the invention provides a new theoretical basis for RCS measurement and calibration treatment and has the following advantages that a concept of a target wide-band plural scattering function is introduced to guide a process of determining test and treatment, form background clutter extraction and precise background subtraction treatment method and algorithm, and analyze main factors which affect uncertainty of an external field test. Besides, the method has universality.

Description

technical field [0001] The invention relates to the technical field of radar cross-section (RCS) measurement and radar signal processing, in particular to a signal processing method for improving background subtraction technology in remote continuous calibration RCS measurement. Background technique [0002] In the field measurement of radar cross section (RCS), the off-site continuous calibration measurement technology is usually used. At this time, the calibration body and the target are located at different radar distances, and a low-scattering metal bracket is generally used as a support for the calibration body and the measured target. The bracket, the schematic diagram of its geometric relationship is as follows figure 1 shown. [0003] Depend on figure 1 , the received echo power of the calibration object and the target to be measured all satisfy the radar equation (see Xu Xiaojian, Huang Peikang, "Radar System and Its Information Processing", Electronic Industry Pr...

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Problems solved by technology

[0032] The disadvantage of the above-mentioned technical solution in the prior art is that: studies have shown that when the test field environment is not affected by the outside world and the time interval between the measurement background, the calibration body and the target is short, the accurate RCS of the target can be completed by using the above-mentioned measurement steps. Measurement

However, under field test conditions, the environment is greatly affected by weather and other conditions, and it takes a long time to hoist the target in the measurement of large targets. Wave changes with time, because the background measurement is not continuous measurement, and the time interval between it and the target measurement is long, due to the amplitude and phase drift of the measurement radar system and the change of the environmental factors of the test site, it will lead to the above measurement and The processing step does not perform the background vector subtraction well, which leads to a large increase in the target RCS test error

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