SAR system based on frequency modulation continuous wave system and its processing method

Abstract

The present disclosure provides a SAR system based on the FM continuous wave system, including: a transceiver antenna; a radio frequency module, connected to the transceiver antenna, including a transmitting channel, a receiving channel, a frequency source, and a power amplifier module; a digital module, connected to the radio frequency module, including Control module, timing and timing module, AD module, DA module and recording module; image processing module, connected to the digital module, including motion compensation module and imaging processing module. The SAR system is constructed using the frequency modulation continuous wave system, and the main performance parameters of the system are designed based on the FMCW system, which meets the advantages of simple structure, small size, light weight, and low cost of the system, and has high distance resolution. And combined with the actual application requirements, the processing method of the radar system is designed to meet the application requirements of many fields such as military reconnaissance, geological survey, topographic mapping, marine survey, agricultural and forestry survey, etc.

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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