SAR system based on frequency modulated continuous wave system as well as processing method thereof

Abstract

The invention provides an SAR system based on a frequency modulated continuous wave (FMCW) system, comprising a transceiving antenna, a radio frequency module, a digital module and an image processingmodule, the radio frequency module is connected to the transceiving antenna and comprises a transmitting channel, a receiving channel, a frequency source and a power amplifier module; the digital module is connected to the radio frequency module and comprises a control module, a time service module, an AD module and a DA module and a record module; and the image processing module is connected tothe digital module and comprises a motion compensation module and an imaging processing module. The SAR system is built by adopting the FMCW system, main performance parameters of the system are designed based on the FMCW system, the advantages of simple system structure, small size, light weight and low cost are met, and the SAR system also has relatively high range resolution. Meanwhile, the actual application requirement is combined, and a processing method of the radar system is designed, so as to adapt to application requirements in many fields such as military reconnaissance, geologicalexploration, topographic mapping, ocean exploration as well as agriculture and forestry reconnaissance.

Description

technical field [0001] The present disclosure relates to the technical field of SAR, and in particular to a SAR system based on a frequency modulation continuous wave system and a processing method thereof. Background technique [0002] Synthetic aperture radar (SAR) imaging is a mature coherent microwave remote sensing technology that can provide large-scale two-dimensional high-resolution images of the earth's surface reflectivity. Such as Figure 7 As shown, SAR is an active radar imaging system that usually works in the microwave region of the electromagnetic spectrum, that is, between the P-band and the Ka-band. SAR imaging systems usually use mobile platforms, such as airplanes, unmanned aerial vehicles (UAVs), and space shuttles or satellites, as the carrier. The direction of electromagnetic wave irradiation is perpendicular to the flight path to form a side-view observation geometry. The system transmits microwave signals to the earth's surface and receives the back...

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Problems solved by technology

[0005] However, traditional radars have technical problems of large size, heavy weight, and high power consumption, which lead to limited platforms. Therefore, it is necessary to design a SAR system with light, small, low power consumption, and high precision. This disclosure provides a frequency-modulated continuous wave-based Systematic SAR system and its processing method to meet the application requirements of various light and small platforms for loads

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