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All-digital satellite signal simulator

A satellite signal and digital signal technology, applied in digital transmission system, multi-carrier system, radio transmission system, etc., can solve the problem that the consistency of multiplex modulation units cannot be guaranteed, the relative bandwidth of radio frequency filters is small, and local oscillator signals cannot be filtered. In addition to other problems, to solve the problem of inconsistency in the code stream rate, easy to implement, and ensure the integrity of the code stream

Inactive Publication Date: 2018-08-28
10TH RES INST OF CETC
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AI Technical Summary

Problems solved by technology

The input of the satellite signal analog source radio frequency circuit can be a single signal or multiple signals. Selecting multiple signal inputs and modulating multiple radio frequency signals through multiple modulation units is expensive, the circuit is extremely redundant, and the debugging is complicated. The accuracy is extremely high, for example, to simulate 12 satellites, 12 modulation units are required, and the consistency of the multiplex modulation units cannot be guaranteed
Because the relative bandwidth of the RF filter required is very small, it is difficult to realize in actual engineering, and the local oscillator signal cannot be well filtered

Method used

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Embodiment Construction

[0040] refer to figure 1. In the embodiment described below, an all-digital satellite signal simulation source adopts a CPCI board that can be inserted into a CPCI chassis structurally. The board is mainly composed of a digital processing part and an analog processing part. The CPCI board is provided with a digital processing part and an analog processing part, and the digital processing part adopts Box_Muller logic algorithm software, which includes a digital-to-analog converter of an external point-frequency clock source, an external memory connected to the field programmable digital signal processor DSP Gate Array FPGA. The analog processing part is mainly composed of broadband filter attenuators. Digital signal processor DSP can choose a high-performance TMS320C6455 chip of TI Company as the system control and management center. Digital signal processor DSP external memory capacity can be 2Gb and flash memory capacity can be 512Mb. As the main algorithm processing uni...

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Abstract

An all-digital satellite signal simulator proposed by the invention aims to provide a simulator capable of providing a plurality of modulation modes such as UQPSK. The invention is realized by the following technical scheme: the simulator board transmits the encoded data generated in the Matlab in advance to the field programmable gate array FPGA through the PCIE bus interface of the main controlboard to the simulator board to generate 32 channels of DDS modulation data; the DSP on the simulator board receives the coding mode, the modulation mode and the coded data source sent by the main control board through the SRIO interface to select control parameters of the switch signal, and inputs the parsed control parameters respectively to the channel coding unit, the signal modulation unit and the selector in the field programmable gate array FPGA through the EMIF bus; due to the channel coding unit, the digital-to-analog converter converts the channel data into high-intermediate frequency analog signals according to different coding modes of input differential coding and convolutional coding; and the high-intermediate frequency analog signals are sent to the analog processing sectionto output a high-intermediate frequency broadband satellite analog signal with multiple modes and continuously variable code rate.

Description

technical field [0001] The invention relates to an analog device used in a high-speed data transmission system for satellite transmitting signals in the field of satellite measurement and control communication. In particular, it is an all-digital satellite signal analog source that provides satellite signals for ground measurement and control and digital transmission equipment. technical background [0002] With the continuous improvement of the resolution of time, space, radiation, spectrum and other characteristics of satellites such as remote sensing and detection, the amount of raw data that needs to be transmitted per unit time has doubled, and the transmission capacity of its data transmission system has become more and more important. The bottleneck of raw data back to the ground. The United States was the first to research and develop high-speed data transmission technology. In the late 1990s, the high-speed data transmission technology of 622Mbps was practically im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185H04L27/36H04B17/391
CPCH04B7/18517H04B17/3912H04L27/36H04L27/362
Inventor 刘红伟马力科方科孙德荣唐宇荣王宇舟张晓波韩锞
Owner 10TH RES INST OF CETC
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