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- W2085653909 abstract "New astronomical and remote-sensing instruments require microwave spectrometers with modest spectral resolution over many gigahertz of instantaneous bandwidth. Applications include millimeter-wave searches for distant objects with poorly known redshifts, submillimeter and far-infrared observations of Doppler-broadened spectral lines from galaxies, and observations of pressure-broadened atmospheric lines.Wide bandwidths and the consequent stability requirements make it difficult to use general-purpose receiver and spectrometer architectures in these applications. We discuss analog auto- and cross-correlation lag spectrometers that are optimized for these observations. Analog correlators obtain their wide bandwidths by a combination of transmission line delays and direct voltage multiplication in transistor or diode mixers. We show results from a new custom transistor multiplier with bandwidth to 25 GHz. Stability becomes increasingly important as bandwidths broaden. We discuss system requirements for single-dish correlation radiometers, which have intrinsic high stability, and present results showing that analog cross-correlators are suitable backends for these receivers." @default.
- W2085653909 created "2016-06-24" @default.
- W2085653909 creator A5015922114 @default.
- W2085653909 date "2003-02-01" @default.
- W2085653909 modified "2023-09-23" @default.
- W2085653909 title "Heterodyne spectrometers with very wide bandwidths" @default.
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- W2085653909 doi "https://doi.org/10.1117/12.459150" @default.
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