This paper presents a CW low power celiometer designed for cloud base height measurements. The 500-mW CW IR laser of the celiometer is modulated by a pseudo noise sequence. The scattered and delayed light signal is obtained by a correlation system with output bandwidth of only 3.5 Hz. This enables to obtain the ranges of 1.2 km to the clouds and the accurancy of the order of ± 2.5 m to the solid objects. The following problems are discussed: principle of operation, device architecture, and error estimation. Some measurement results are also enclosed.
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