Method for increasing signal and noise ratio of atmospheric sounding Fourier spectrometer
An atmospheric detection and spectrometer technology, applied in the field of improving the signal-to-noise ratio of the spectrometer, can solve the problems that the analog filter cannot filter the quantization noise, the spectral bandwidth of the atmospheric detection spectrometer is narrow, and the noise of the detection spectral band is increased, so as to simplify the design difficulty and avoid Analog circuit design, effect of increasing sampling data rate
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[0035] The basic idea of the present invention is: to propose a method for improving the signal-to-noise ratio of the Fourier infrared spectrometer for atmospheric detection. Sampling, and subdividing each zero-crossing pulse cycle into several sub-pulses with equal time intervals, using the subdivided sub-pulses as trigger signals to realize oversampling of infrared interference signals, and sampling the collected infrared interference signals The time coordinate information of the point is transformed into the optical path difference coordinate information, and the equal optical path difference interpolation resampling calculation is performed on the sampled data between the zero crossing points, and the digital downsampling filter is performed on the resampled data. The method of the invention improves the data sampling frequency and realizes digital filtering, not only can eliminate aliasing noise and quantization noise in sampling, but also avoids noise introduced by ana...
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