A Modem Suitable for Ultra-Long Distance Scattered Links

A modem, ultra-long-distance technology, applied in the field of communication, can solve the problem of serious frequency deviation of ultra-long-distance scattering links, achieve the effect of overcoming the difficulty of signal reception synchronization, solving frame out-of-sync or even broken links, and fast synchronization establishment

Active Publication Date: 2019-11-05
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

The present invention also adopts the demodulation method of secondary spread spectrum plus pilot frequency to effectively solve the problem of serious frequency deviation of ultra-long-distance scattering links, and ensure that the equipment realizes fast and high-precision synchronization establishment and maintenance under harsh channel conditions

Method used

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  • A Modem Suitable for Ultra-Long Distance Scattered Links
  • A Modem Suitable for Ultra-Long Distance Scattered Links
  • A Modem Suitable for Ultra-Long Distance Scattered Links

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Embodiment Construction

[0017] refer to Figure 1 to Figure 3 , The present invention consists of a modulator 1, a demodulator 2, an auxiliary multiplexer 3, an auxiliary splitter 4, an intermediate frequency amplifier 5 and a rubidium clock unit 6. figure 1 It is an electric principle block diagram of the present invention, and the embodiment is according to figure 1 Connect the lines.

[0018] refer to figure 1 , at the sending end: the auxiliary multiplexer 3 receives the service data and service clock input by the external service terminal, performs service multiplexing, and sends the multiplexed information code stream and symbol clock to the modulator 1; the modulator 1 utilizes the symbol The clock performs baseband processing on the information code stream, performs carrier modulation, and outputs a modulated intermediate frequency signal E. At the receiving end: the intermediate frequency amplifier 5 receives the demodulated intermediate frequency signal F input by the external radio freq...

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Abstract

The invention discloses a modem suitable for an ultra-long-distance scattering link, which relates to a scattering communication system with long communication distance, serious frequency deviation and extremely low signal-to-noise ratio in the communication field. It consists of modulator, demodulator, intermediate frequency amplifier, auxiliary multiplexer, auxiliary splitter, rubidium clock unit and other components. The invention adopts the channel coding and decoding technology based on the CCSDS standard, so that the wireless communication system can be applied to the scattered channel environment with extremely low signal-to-noise ratio, and ensures high reliability transmission of services. The present invention also adopts the demodulation method of secondary spread spectrum and pilot frequency to ensure the low receiving threshold of the equipment and realize the rapid establishment and maintenance of equipment synchronization under the state of large frequency deviation. It is especially suitable for high-quality and high-reliability transmission of services on long-distance scattering communication links under the condition of Rayleigh deep fading channel.

Description

technical field [0001] The invention relates to a modem suitable for ultra-long-distance scattering links in the field of communication, and is especially suitable for solving the problems of large path loss, serious frequency offset, and extremely low signal-to-noise ratio of ultra-long-distance scattering communication links, and is resistant to remote The deterioration of channel conditions caused by distance improves communication reliability. Background technique [0002] When existing scatter modems work under ultra-long-distance scatter link conditions, commonly used scatter modulators do not use high-performance coding methods and cannot effectively resist communication path loss; most demodulators use differential demodulation, and their anti-frequency Strong bias ability, but poor demodulation performance, especially in the ultra-long-distance link of the scattering variable parameter channel, due to the extremely low signal-to-noise ratio of the channel, the synch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7073H04L27/00
CPCH04B1/7073H04L27/00
Inventor 毛晶晶石柳陈小溪韩燕杰
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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