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Double-receiving and double-transmitting modulator-demodulator of satellite

A modem, double-receiving and double-transmitting technology, applied in the field of satellite communication, can solve the problems of poor versatility, low integration, heavy weight, etc., and achieve the effect of light weight, strong versatility, and resource cost saving

Inactive Publication Date: 2014-03-19
TECH SERVICE CENT BEIJING GUODIANTONG NETWORK TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the modem equipment has the problems of large volume, heavy weight, low integration and poor versatility.

Method used

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  • Double-receiving and double-transmitting modulator-demodulator of satellite
  • Double-receiving and double-transmitting modulator-demodulator of satellite

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Embodiment Construction

[0020] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0021] refer to figure 1 , the dual-receipt and dual-transmission satellite modem of the present invention includes: a baseband modulation and demodulation unit, an L-band intermediate frequency unit, a monitoring unit and a power feed control unit, wherein,

[0022] 1. The baseband modulation and demodulation unit is used for modulation and demodulation, channel coding and decoding, synchronization, digital phase-locked loop, large frequency deviation correction and analog-to-digital and digital-to-analog conversion of the data sent by the L-band intermediate frequency unit.

[0023] As a preferred solution, refer to figure 2 , the baseband modulation and demodulation unit includes: digital-analog, analog-to-digital devices, field programmable gate array chip (FPGA chip for short) and embedded processor, wherein:

[0024] (1) Digital-...

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Abstract

The invention discloses a double-receiving and double-transmitting modulator-demodulator of a satellite. The modulator-demodulator is characterized by comprising a base band modulation-demodulation unit, an L-wave band intermediate frequency unit, a monitoring unit and a power supply feed control unit, wherein the base band modulation-demodulation unit comprises two groups of digital-analog and analog-digital apparatuses arranged in parallel, a field-programmable gate array chip and an embedded processor. The embedded processor is provided with an ethernet interface, a serial data interface and a 32-bite bus wide PCI (Peripheral Component Interconnect) interface. The modulator-demodulator disclosed by the invention has the beneficial effects of being high in integration level, small in size, light in weight and strong in universality; the signal to noise ratio threshold for channel demodulation is lower than 3.5dB, and reliable communication under a low signal to noise ratio condition is ensured; the modulator-demodulator can be agilely and conveniently used by a user, the cost of renting satellite wideband resources is saved, and meanwhile, services at different rates are provided; the transmission efficiency can be effectively improved, and the bandwidth is saved.

Description

technical field [0001] The invention relates to a satellite modem, in particular to a dual-receiving and dual-transmitting satellite modem, which belongs to the technical field of satellite communication. Background technique [0002] Under the satellite communication SCPC system, if the remote small satellite station is added, a corresponding number of modems must be added to the main satellite station. In the prior art, it is realized by assembling multiple satellite modems. Therefore, the modulation and demodulation equipment has the following problems: large volume, heavy weight, low integration, and poor versatility. Contents of the invention [0003] In order to solve the deficiencies of the prior art, the object of the present invention is to provide a satellite modem with dual receiver and dual transmitter with high integration, small size, light weight, strong versatility, high transmission efficiency and bandwidth saving. [0004] In order to achieve the above ...

Claims

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Application Information

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IPC IPC(8): H04B7/185
Inventor 傅宁李建德焦阳刘宇翔王梓杨魏伟杨海健王孜刘锋赵军
Owner TECH SERVICE CENT BEIJING GUODIANTONG NETWORK TECH
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