All-digital satellite signal simulated source

Abstract

The invention provides an all-digital satellite signal simulated source. The all-digital satellite signal simulated source comprises a double-port storage, the double-port storage is a FPGA which provides interfaces for various rate conversions between coding and modulation, is connected with a digital to analog converter through a high-speed serial interface to form a core hardware framework of the satellite signal simulated source, and is connected with a broadband filter directly through a simulation output end to produce multimode high and moderate frequency broadband satellite signal simulated signals with code rates which can vary continuously, a digital signal processor serves as a main control device of the simulated source and performs analysis of various parameters issued by a monitor and parameter configuration of the FPGA, a 32-channel parallel modulation system is arranged inside the FPGA, for example, a 32-channel direct digital synthesizer (DDS) performs parallel output and composition of the central frequency, the FPGA determines the overturn of the carrier phase according to a symbol rate and a main frequency of parallel calculation, IQ two-channel signals, signal coding, code conversion and quadrature modulation are produced through a logical algorithm, a Q channel uniformization coefficient is calculated according to an IQ unbalanced parameter, Q channel uniformization coefficient and the Q channel signal amplitude are subjected to multiply-add arithmetic to calculate the Q channel amplitude, IQ is added, and a unbalanced quadrature phase shift keying (UQPSK) modulation method is simulated.

Description

technical field [0001] The invention relates to a simulation device for satellite transmitting signals in satellite measurement and control and high-speed data transmission systems. It is mainly used in the field of wireless broadband communication. It is a signal source device provided for high-speed satellite data transmission system. It can simulate communication methods of various modes and data encoding methods in satellite communication, and provide broadband channel simulation. A simulation method for providing satellite signals for ground measurement and control and data transmission equipment. technical background [0002] Wireless broadband and high-speed data transmission technology are one of the core technologies of high-speed wireless data transmission systems. With the development of satellite technologies such as reconnaissance, remote sensing, and detection, more and more satellites adopt higher transmission code rates, such as the United States Quick Bird d...

AI Technical Summary

Problems solved by technology

To ensure the consistency of so many links, it is quite complicated to implement, and sometimes it is necessary to select two sets of devices with good consistency among multiple components

When debugging multiple sets of equipment, it is necessary to calibrate each set, which is laborious and time-consuming

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