학술논문

Digital demodulator for wide bandwidth SAR
Document Type
Conference
Source
IGARSS 2000. IEEE 2000 International Geoscience and Remote Sensing Symposium. Taking the Pulse of the Planet: The Role of Remote Sensing in Managing the Environment. Proceedings (Cat. No.00CH37120) Geoscience and remote sensing Geoscience and Remote Sensing Symposium, 2000. Proceedings. IGARSS 2000. IEEE 2000 International. 5:2269-2271 vol.5 2000
Subject
Geoscience
Signal Processing and Analysis
Demodulation
Bandwidth
Local oscillators
Mixers
Filters
Transfer functions
Signal generators
Frequency conversion
Remote sensing
Buildings
Language
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).