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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Применить Всего найдено 2. Отображено 2.
26-03-2014 дата публикации

Non-dispersive infrared light gas detection system

Номер: CN103674882A
Автор: ZHANG HUALIANG, GONG FEI, GUO ZHAOFENG, LIU ZHIJUN, HAN QUAN, TANG XUESHU, ZHANG ZHI, YANG ZENGSHUN, LU YUNZHE, JIN JINGFENG
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The invention discloses a non-dispersive infrared light gas detection system adopting an electric pulse infrared light modulation method, so as to reduce power consumption at the part where infrared light is modulated, and stability is improved; an internal coating method is adopted in structural design of a gas chamber, so that infrared light diffusion and external disturbance are reduced further, and gas detection accuracy is improved; a calibrating circuit is used for signal processing, so that different collected gas can be detected accurately through calibration; a programmable logic device is adopted to calibrate different environmental factors in air through software collection, the functions of data teletransmission, abnormity warning and the like are achieved through FPGA treatment, thereby improving module detection precision, timeliness and stability and reducing system cost simultaneously. The non-dispersive gas detection system disclosed by the invention has the advantages ...

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Номер записи: 1
04-06-2014 дата публикации

High-precision digital instantaneous frequency measurement method and device

Номер: CN103837740A
Автор: HAN QUAN, ZHANG HUALIANG, TANG XUESHU, LU YUNZHE, YANG ZENGSHUN, LI JIE, ZHANG ZHI, HUANG SHANSHAN, CHEN MENGJIE, CUI LIANG
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The invention discloses a high-precision digital instantaneous frequency measurement method and device. The method comprises the steps that frequency conversion and filtering of radio-frequency signals are carried out at the radio-frequency receiving front end, and X-waveband signals are converted to be medium-frequency signals; AD conversion is carried out on the medium-frequency signals, down-conversion is carried out on the converted medium-frequency signals through a digital signal processing device, and then medium-frequency digital signals are obtained; the medium-frequency digital signals are converted to be base-band digital signals; a dual-signal estimation method based on an FFT and signal square is adopted, the base-band digital signals are computed through an FPGA, and a frequency measurement result is obtained. The high-precision digital instantaneous frequency measurement method and device solve the problem that the frequency measurement precision of the X-waveband pulse signals ...

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Номер записи: 2