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Dynamic signal simulation method of QPSK (Quadrature Phase Shift Keying) spread-spectrum satellite

A technology of dynamic signal and analog method, which is applied in the field of spread spectrum communication, and can solve problems such as difficulty in development

Inactive Publication Date: 2015-05-13
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the development of the satellite dynamic signal simulation scheme involves a more comprehensive understanding of the entire system, its development is very difficult

Method used

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  • Dynamic signal simulation method of QPSK (Quadrature Phase Shift Keying) spread-spectrum satellite
  • Dynamic signal simulation method of QPSK (Quadrature Phase Shift Keying) spread-spectrum satellite
  • Dynamic signal simulation method of QPSK (Quadrature Phase Shift Keying) spread-spectrum satellite

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Embodiment Construction

[0061] An implementation of the inter-satellite dynamic signal simulation method proposed by the present invention will be described below through a specific implementation example.

[0062] This method is implemented in FPGA V5 series chip XC5V1X330T of Xilinx Company and DSP TMS320C6713 of TI Company. The working clock of ADC and FPGA system is 100MHz. figure 1 As shown, the parameters that need to be configured include: satellite number, satellite dynamic delay, Doppler rate of change, Doppler first-order rate of change, Doppler second-order rate of change, and message data rate. The system can realize the flexible configuration of the above parameters, and the specific implementation process is as follows:

[0063] 1 Step 1: Dynamic value generation at every second:

[0064] Before the system starts, the system needs to be initialized and configured. In the software, set the corresponding dynamic delay, Doppler change rate, Doppler first-order change rate, and Doppler sec...

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Abstract

The invention provides a dynamic signal simulation method of a QPSK (Quadrature Phase Shift Keying) spread-spectrum satellite. The method comprises the major four steps of 1, generating a dynamic signal per second according to an initial value of an externally inputted dynamic signal; 2, converting the dynamic signal per second into a dynamic frequency control word; 3, generating a QPSK spread-spectrum signal; 4, feeding back a dynamic emission value and adjusting. According to the method, the initial value of the externally inputted dynamic signal is converted into carrier and pseudo-code Doppler; electronic text data, a pseudo code and the carrier are modulated, then the final spread-spectrum signal is outputted through a DA converter, and the emission dynamic value is fed back to a calibration module, so as to finish the dynamic feedback adjusting, and the dynamic simulation accuracy is improved.

Description

technical field [0001] The invention relates to a QPSK spread-spectrum satellite dynamic signal simulation method, which is related to the research direction of aerospace measurement and control and spread-spectrum signal processing, and belongs to the technical field of spread-spectrum communication related to aerospace. Background technique [0002] In recent years, with the increasing demand for satellite applications, formation flying to realize space virtual detection has gradually become the most active and potential cutting-edge technology in aerospace technology and applications; autonomous navigation of constellations obtains information through its own measurement, and uses autonomous navigation algorithms to realize Autonomous operation of constellations is also a hot topic in aerospace. Among them, inter-satellite link measurement is a key technology that needs to be solved urgently in the study of satellite formation and satellite constellation system. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/23
CPCG01S19/235
Inventor 常青杨伟才徐勇黄涛吴阳璞赵小鲂
Owner BEIHANG UNIV
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