DOI: 10.3724/SP.J.1249.2019.02170

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2019/36:2 PP.170-175

Measurement and verification of radar cross section of complex targets in terahertz frequency band

Radar cross section (RCS) measurement of complex models in terahertz band is considered challenge mainly owing to the following two reasons. One is the low signal to noise ratio (SNR) of measurement system, which limits the measurement accuracy. The other is the difficulty in calculating RCS values for complex models, which makes it hard to evaluate the measurement results and the performance of the system. To overcome these problems, we construct a multiband terahertz RCS measurement system based on a vector network analyzer. The signal of the system has good stability in frequency, amplitude and phase, which leads to improvement in RCS measurement accuracy. Based on the system, we measure RCS of complex target models (jeep and satellite) at 220 GHz and 440 GHz (with azimuth angle of 0°~360°, pitching angle of 0°) and use different methods to evaluate the performance of the system. The methods refer to comparing measurement results with computing values and calculating the difference of measurement results between symmetrical parts of the model. The results show that the system is capable of measuring the scattering characteristics of complex targets in terahertz band with high precision. The system is of great value for the development of terahertz radar system and the research of RCS scaling measurement.

Key words:electronic technique,radar cross section,terahertz radar,measurement system,microwave frequency multiplication,complex structure,electrically large object

ReleaseDate:2019-12-02 09:24:38

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