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Wideband Signal Generator Implementation for Earth Observation Satellite  

Kim, Joong-Pyo (한국항공우주연구원 위성전자팀)
Ryu, Sang-Burm (한국항공우주연구원 위성전자팀)
Lim, Won-Gyu (한국항공우주연구원 위성전자팀)
Lee, Sang-Kon (한국항공우주연구원 위성전자팀)
Publication Information
Journal of Satellite, Information and Communications / v.8, no.2, 2013 , pp. 88-93 More about this Journal
Abstract
The wideband chirp signal generator to enhance the resolution of synthetic aperture radar of obtaining the earth observation image is needed. This paper deals with designing, manufacturing and testing the wideband digital chirp signal generator having high resolution for LEO earth observation satellite. The wideband digital chirp signal generator is implemented with the memory-map based structure which is mostly applied in the satellite, and consists of the digital module to generate the digital chirp signal and the RF module to perform the quadrature modulation. The I/Q signals stored in the memory of the digital module are D/A converted and delivered to be quadrature modulated with the reference signal of 1275 MHz in the RF module. Furthermore, the test bench and GUI to validate the signal generator function are also developed. It is found that the requirement of 144 MHz bandwidth for the digital chirp signal generator is well met. Finally it is noteworthy that the distortion occurred in the chirp signal generator was compensated by the pre-distortion compensation.
Keywords
earth observation satellites; synthetic aperture radar; digital chirp signal generator; quadrature modulator; pre-distortion compensation;
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  • Reference
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