Stepping frequency synthetic aperture radar-based near-distance RCS measurement electronic system

Abstract

The invention discloses a stepping frequency synthetic aperture radar-based near-distance RCS measurement electronic system, and relates to a frequency stepping technology, an SAR image processing andan FPGA digital signal processing. Compared with a traditional method such as far-field measurement and compact-field measurement, the radar RCS near-field imaging method has the advantages that theacquired information quantity is greatly increased, and richer target scattering characteristic distribution can be obtained with regard to near-distance measurement of a target relative to a radar system. Aiming at defect of a background technology, the radar system employs a stepping frequency narrow pulse signal to transmit and receive a shared antenna, the distance blind region is small, the measurable range is large, and the problem of isolation of a continuous wave mechanism is prevented; the stepping frequency signal belongs to one of pulse signals; in the radar employing the frequencystepping signal, large bandwidth at an arbitrary frequency can be flexibly acquired by carrier frequency jump of each pulse in a coherent pulse string, and an effect of high distance resolution is obtained by IDFT processing on pulse echo; and meanwhile, the index requirements of instantaneous bandwidth processing of a digital signal and digital processing hardware of an echo signal of a receivingare reduced.

Description

technical field [0001] The invention is a short-distance RCS electronic measurement system based on a step-frequency synthetic aperture radar, and relates to frequency step technology, SAR image processing, and FPGA digital signal processing. Background technique [0002] Radar cross-section (RCS) is a complex physical quantity that characterizes the ability of a radar target to scatter irradiated electromagnetic waves, and is related to the geometric size of the target, the parameters of the incident electromagnetic wave, and the attitude angle of the target relative to the radar. In recent years, with the advancement of science and technology, the development of stealth technology and anti-stealth technology, RCS measurement also needs to propose more effective and accurate methods. The existing radar RCS measurement methods mainly include theoretical calculation and actual measurement. The former calculates the RCS of the target through electromagnetic theory, but is lim...

AI Technical Summary

Problems solved by technology

During the transmission of the echo signal in the RF cable, due to the loss of the physical characteristics of the cable and the complex environment, the phase will have different degrees of error, and the measurement accuracy will be affected.

The transmission of echo signals in the form of radio frequency not only requires high device selection and specifications in the signal processing part of the system, but also increases the design requirements and cost of cables

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