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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

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 6. Отображено 6.
23-06-2023 дата публикации

Processing method for directly manufacturing and forming 316L thin-wall part by laser based on pulse shaping

Номер: CN116275096A
Автор: WANG XINLIN, YU HAN, JIANG JINKUN, LI XIANG, ZHAO YANQIN, HU ZHIQIANG
Принадлежит:

The invention belongs to a laser direct manufacturing and forming technology of metal powder, and discloses a processing method for laser direct manufacturing and forming of a 316L thin-wall part based on pulse shaping, which comprises the following steps: determining a processing technological parameter range for laser direct manufacturing and forming treatment according to the expected length and width of the 316L thin-wall part; during laser direct manufacturing and forming treatment, the waveform of a laser pulse is slope rising and/or slope falling; carrying out a process experiment according to the determined processing process parameters, and determining the number n of deposition layers and the deposition height h when a stable state is reached; according to the expected height H of the 316L thin-wall part, the total deposition layer number N is determined; wherein the laser direct manufacturing forming treatment is carried out according to the process parameters determined in the ...

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Номер записи: 1
01-08-2023 дата публикации

Method and device for recovering carrier phase of optical fiber communication system

Номер: CN116527466A
Автор: ZHANG QI, LI ZHIPEI, XIN, XIANGJUN, GAO YUAN, JIANG JINKUN, YAO HAIPENG, YU JIANJUN, GAO RAN, TIAN QINGHUA, TIAN FENG, WANG YONGJUN, YANG LEIJING, WANG FU, WANG XISHUO, CHANG HUAN
Принадлежит:

The invention provides a carrier phase recovery method and device for an optical fiber communication system. The method comprises the following steps: predicting received signal carrier phase noise at a receiving end of an optical fiber communication system by utilizing linear time domain data filtering; pre-rotating the received signal according to the predicted carrier phase noise, and pre-compensating the carrier phase noise; estimating a residual error of the received signal after pre-rotation through a power iteration method, wherein the residual error is used for extracting an error between predicted carrier phase noise and actual phase noise; and updating the next state quantity of linear time domain data filtering according to the extracted error between the predicted phase noise and the actual phase noise to realize carrier phase recovery. The method can effectively solve the problem of carrier phase recovery in an optical fiber communication system, and is good in algorithm robustness ...

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Номер записи: 2
21-07-2023 дата публикации

Adaptive receiving method for partial response codes of optical fiber communication system

Номер: CN116470964A
Автор: ZHANG QI, XIN XIANGJUN, YAO HAIPENG, HAO YUFAN, JIANG JINKUN, GAO RAN, TIAN QINGHUA, TIAN FENG, WANG YONGJUN, YANG LEIJING, LI ZHIPEI, WANG FU, WANG XISHUO, CHANG HUAN, GUO DONG
Принадлежит:

The invention provides a self-adaptive receiving method for partial response codes of an optical fiber communication system, and relates to the field of optical fiber communication systems. The method comprises the following steps of: performing mixed feed filtering processing on a signal by utilizing a self-adaptive partial response mixed feed structure; the filter tap coefficient is updated with a large step length according to an adaptive algorithm, and the filter tap coefficient corresponding to the partial response coding coefficient is calculated; the calculated tap coefficient is updated with a small step length, and a self-adaptive partial response removal algorithm is carried out on the received signal; and directly decoding the signal of which the partial response code is removed to obtain original information. When the method provided by the embodiment of the invention is used for receiving the partial response coding signal, the influence of noise and intersymbol interference ...

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Номер записи: 3
05-05-2023 дата публикации

Optical signal generation method for bit reconstruction

Номер: CN116073910A
Автор: ZHANG QI, XIN XIANGJUN, YAO HAIPENG, XIE RONGZHEN, GAO RAN, TIAN QINGHUA, TIAN FENG, WANG YONGJUN, YANG LEIJING, LI ZHIPEI, WANG FU, JIANG JINKUN, PANG PANDI, CHANG HUAN, GUO DONG, ZHANG WENQUAN, WU RUIDE, HUANG XIN
Принадлежит:

The invention provides a bit reconstruction optical signal generation method, and relates to the field of optical fiber communication systems. The method comprises the following steps: processing a transmitting end signal by using an enhanced correlation coding circuit to obtain a signal with strong correlation; performing constellation mapping according to a partition mapping unit rule to obtain binary information bits after bit reconstruction; and modulating the signal by using optical modulation to obtain a bit-reconstructed optical signal. The optical system signal generated by the method provided by the embodiment of the invention can still realize lower error codes at a receiving end through transmission of an optical fiber channel, so that the transmission reliability of the system is effectively improved, and the purpose of reducing the sending power of the system is achieved.

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Номер записи: 4
18-04-2023 дата публикации

Coding modulation implementation method for low-complexity probabilistic shaping

Номер: CN115987398A
Автор: ZHANG QI, XIN XIANGJUN, JIANG JINKUN, YAO HAIPENG, GAO RAN, YU JIANJUN, TIAN FENG, TIAN QINGHUA, YANG LEIJING, WANG YONGJUN, WANG FU, LI ZHIPEI, CHANG HUAN
Принадлежит:

The invention provides a low-complexity probability shaping coded modulation implementation method, and relates to the field of optical fiber communication systems. According to the method, implementation of probability shaping is combined in a modulation process, mapping of uniform bits to expected symbol distribution is realized through three steps of probability subset division, subset weight calculation and shaping frame construction, and meanwhile, the problems of low parallelization degree, serious error code propagation and poor forward error correction code compatibility in a traditional shaping technology are avoided.

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Номер записи: 5
25-07-2023 дата публикации

Balancing method for high-speed optical communication system

Номер: CN116488970A
Автор: ZHANG QI, XIN XIANGJUN, YAO HAIPENG, YANG RUI, JIANG JINKUN, GAO RAN, TIAN QINGHUA, TIAN FENG, WANG YONGJUN, YANG LEIJING, LI ZHIPEI, WANG FU, WANG XISHUO, CHANG HUAN, GUO DONG
Принадлежит:

The invention provides a high-speed optical communication system equalization method, which comprises the following steps of: constructing a neural network equalizer based on Volterra series, enhancing a combined neural network by adopting cross-correlation learning, and combining linear compensation and nonlinear compensation, so that the network does not need an additional linear compensation module any more, and the overall compensation capability of the network is enhanced; through an additional enhanced cross-correlation learning layer, the neural network can better learn second-order and third-order cross-correlation items of an input signal, and the compensation capability of the neural network to system nonlinearity is enhanced. Learning a high-order cross-correlation term of the input signal from the low-order self-correlation input signal through a high-order full-connection layer; and meanwhile, a clustering algorithm is used at the dense weight part in the network, so that the ...

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Номер записи: 6