Title :
Digital demodulator for wide bandwidth SAR
Author :
Jorgensen, Jan Hjelm
Author_Institution :
Dept. of Electromagn. Syst., Tech. Univ. Denmark, Lyngby, Denmark
Abstract :
A novel approach to the design of efficient digital quadrature demodulators for wide bandwidth SAR systems is described. Efficiency is obtained by setting the intermediate frequency to 1/4 the ADC sampling frequency. One channel is made filter-free by synchronizing the local oscillator with the output decimator. The filter required by the other channel is optimized through global search using the system level performance metrics integrated sidelobe level ratio (ISLR) and peak sidelobe level ratio (PSLR)
Keywords :
geophysical equipment; geophysical techniques; radar equipment; remote sensing by radar; synthetic aperture radar; terrain mapping; ADC; SAR; analog to digital converter; digital demodulator; digital quadrature demodulator; geophysical measurement technique; integrated sidelobe level ratio; intermediate frequency; land surface; local oscillator; output decimator; peak sidelobe level ratio; radar remote sensing; synchronizing; synthetic aperture radar; system level performance metrics; terrain mapping; wide bandwidth; Bandwidth; Buildings; Demodulation; Filters; Frequency conversion; Local oscillators; Mixers; Remote sensing; Signal generators; Transfer functions;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2000. Proceedings. IGARSS 2000. IEEE 2000 International
Conference_Location :
Honolulu, HI
Print_ISBN :
0-7803-6359-0
DOI :
10.1109/IGARSS.2000.858378
