Design And Implementation Of GNSS Navigation Signal Acquisition And Playback System

In recent years,with the rapid development of global satellite navigation system and its supporting products,its value in civil and military has been paid more and more attention.The global satellite navigation system not only facilitates people's lives,creates huge market economic value,but also plays an irreplaceable role in military naval navigation,weapon precision guidance and so on.This is the reasons that also the world's major powers to invest heavily in research and development of independent global satellite navigation system reason.The 23 rd BD2 navigation satellite launch,marking the independent research and development of China's satellite navigation system is facing the goal of global coverage steadily.With the active navigation market in China and the continuous expansion of the application field,the design and development of the navigation receiver in the special application environment put forward higher requirements.If the specific test scenarios(such as outdoor complex static environment,high speed railway,Ships,aircraft and other high-dynamic scenes)collected under the specific navigation satellite signal back to the room is bound to reduce research costs.Therefore,the design of a GNSS navigation signal acquisition and playback system for teaching,research and high-precision navigation satellite algorithm to provide support,will have a very important practical significance.This paper designs a GNSS navigation signal acquisition and playback system,the current GNSS navigation satellite broadcast navigation signal through the down conversion module processing into IF signal.IF signal processed by the FPGA before the save to the SATA hard drive,when the need to use the collected satellite signals,you can transmit the IF signal that save in the SATA hard drive by the frequency of the launch out to complete the GNSS navigation satellite signal acquisition and playback process.Firstly,the system architecture and implementation scheme are determined according to the design index,function requirement and specific application scenario of the system.Then the hardware and software of the acquisition and playback system are designed and realized.The hardware part mainly completes the design,realization and testing of the structure design,the device and the core board selection,the radio frequency module and the baseband module circuit,and gives the design scheme and the concrete realization of the main function modules of the hardware part;The software part focuses on the design of the Linux system kernel driver,the realization of the custom file system,the SATA2.0 controller,the CY68013 A firmware design,the chip configuration program and the system application software based on the embedded Linux and QT4.The GNSS navigation signal acquisition and playback system designed in this paper combines the acquisition and playback in the hardware,which fills the vacancy of the domestic market.The software proposes a custom file system structure and implements the graphical user interface.The system has the characteristics of "low price,good portability,intuitive interface,operable".