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As an imaging radar, synthetic aperture radar (SAR) requires the images of high-resolution. To enhance the resolution of images, SAR adopts the chirp signal [1]. The chirp signal is often referred as a linear frequency modulated (LFM) signal because the instantaneous frequency of chirp signal increases or decreases linearly with the time. To realize the chirp signal in SAR system, the chirp signal...
For L-band micro satellite on board SAR system, the suitable chirp signal generator for this system is needed. In this paper, the chirp signal generator with direct digital synthesizer (DDS) is considered instead of the memory map based chirp signal generator. Furthermore, to overcome the limitation of clock frequency of the space component, parallelized DDS (PDDS) method is used. However, phase error...
Synthetic aperture radar (SAR) is an active sensor using microwave to acquire the images of target in interest. To be operated, an SAR platform usually loaded on moving platform such as aerial vehicle or satellite then transmits and receives microwave signal for its own illumination sources. Space-borne SAR that is operated on space orbit uses ionosphere and air as a propagation medium. When linearly...
This paper introduces the progress of circularly polarized synthetic aperture radar (CP-SAR) development under collaboration of Chiba University and Ajou University for unmanned aerial vehicle (UAV, JX series) and microsatellites (GAIA series). This sensor will be employed to monitor global disaster area in the future.
Synthetic aperture radar (SAR) is an active sensor that is widely used such as military purpose, land observation, and etc. The main characteristics of SAR system are as follow. First, as SAR uses microwave, it can be operated regardless of the weather and day-night conditions. SAR system uses the signal called chirp to acquire large bandwidth then it provides highresolution images. The conventional...
Coastline is the boundary that discriminates the land and sea area. Originally, to utilize the coastline information, optical images from air-borne or space-borne systems are used. Due to manual interpretation from optical images, conventional coastline extraction method has several error. This paper proposes semi-automatic coastline extraction method using Synthetic Aperture Radar (SAR) images to...
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