Yuxing Zhang, J. Gong, Xianwen Zhou, Yulan Wei, J. Cheeke
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High-resolution spectrometer systems based on SAW chirp filters
In this paper, two high-resolution spectrometer systems based on SAW Chirp-Z-Transform are reported. To achieve high frequency resolutions of 15 kHz (for unweighted compressor) and 20 kHz (for weighted compressor), two SAW RAC, with 68 /spl mu/s dispersion duration each, are cascaded as an expander to offer a long-duration chirp signal and another RAC also with 68 /spl mu/s dispersion is used as the compressor. Both systems are developed in the form of independent modules, and can be used as general-purpose spectrometer subsystems.
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