Small FMCW-based (frequency modulated continuous wave) SAR (synthetic aperture radar) imaging system by using FPGA (field programmable gate array)

Abstract

The invention discloses a small FMCW-based (frequency modulated continuous wave) SAR (synthetic aperture radar) imaging system by using an FPGA (field programmable gate array) to mainly overcome the disadvantages of large volume, heavy weight and high power consumption of the traditional SAR imaging system. The small FMCW-based SAR imaging system comprises a radar front end, an acquisition preprocessing unit, a signal processing unit and a receiving host, wherein the acquisition preprocessing unit comprises an instruction communication module, an A / D (analogue / digital) acquisition module, an FPGA control and calculation module and a data sending interface; the signal processing unit comprises a data receiving interface, an FPGA control module, a DSP (digital signal processor) calculation module and a data sending interface; the acquisition preprocessing unit and the FPGA of the signal processing unit are used for receiving back waves and inertial navigation parameters of the radar front end, feeding back the regulation instruction to the radar front end to perform distance pulse pressure, transmitting data to a DSP, receiving the calculation results of the DSP and transmitting thecalculation results of the DSP to the receiving host for display. According to the small FMCW-based SAR imaging system, one picture can be imaged in real time in one second under the airborne condition, the small FMCW-based SAR imaging system has the advantages of small size, light weight, small power consumption and good reliability and can be applied to the fields of radars, guided missile, remote sensing, etc.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing, in particular to the realization of a small-scale SAR imaging processing system based on a frequency-modulated continuous wave by using an FPGA, which can be widely used in the fields of radar, missile, remote sensing and the like. Background technique [0002] With the deepening of synthetic aperture radar SAR imaging technology research and the rapid development of large-scale integrated circuit technology, short-range miniaturized SAR imaging systems have become the focus of exploration and development in various countries. The miniaturization of SAR system is to minimize the size, weight and power consumption without affecting the imaging function. The small system will help reduce the space and load requirements of the carrier, which will help increase the mobility, flexibility and endurance of the carrier, and at the same time, it will also expand the use range of SAR. ...

AI Technical Summary

Problems solved by technology

This system itself has the following deficiencies, which limit the development of SAR miniaturization

[0005] 1) The structure of the pulsed radar is generally more complicated, and when the action distance is longer, it needs a higher transmission peak power, which makes the system bulky, heavy and expensive

[0006] 2) The pulse radar structure has high requirements on the carrier platform. Due to its volume and weight limitations, it cannot be mounted on a small spacecraft carrier platform, which limits its application range

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