All-digital satellite signal simulator

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...

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

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