Design And Implementation Of Atmospheric Data Solving Device Based On DSP

Accurate collection and high-speed processing of atmospheric parameters during the flight of the aircraft are the key factors to ensure the normal flight of the aircraft.As the flight control system controls the air attitude of the aircraft more and more strictly,the requirements for real-time collection and processing of atmospheric data parameters continue to increase.This paper introduces and designs a DSP-based atmospheric data calculation device,which is embedded on the surface of the aircraft Pressure sensors,temperature sensors and other intuitively obtain atmospheric parameters such as pressure and temperature.The solver receives the sensor data through RS422,and then solves them according to the model algorithm.The solution is then output to the control combination through the 1553 B bus.The subsequent flow Mach number,incoming static pressure,and Atmospheric parameters such as flow angle of attack,lateral slip angle,altitude,etc.,the flight control system can use these data to grasp the flight status of the aircraft in real time,and adjust and change its air attitude.This article investigates the current development status of atmospheric data calculation devices at home and abroad,using DSP’s powerful external interface functions and digital signal processing capabilities,combined with RS422 full-duplex working mode and 1553 B bus centralized control,distributed processing,real-time and reliable features,The design and implementation of the data solving device are mainly explained from the following aspects.First of all,the hardware circuit and the underlying driver of each functional module of the data solving device are analyzed and designed,mainly including: the minimum system design of DSP,the establishment of a basic operating environment;the design of SDRAM and FLASH and EMIF interface circuit and underlying driver,external expansion DSP data and program storage space,complete the bootstrapping of user programs,and realize online programming of the program;design the data communication interface circuit and corresponding driver of RS422 and 1553B;design the A / D conversion circuit,and analyzeits working sequence.Secondly,the internal logic of the solving device is designed: the implementation process of serial port and 1553 B interrupt is introduced;the key voltage acquisition program is developed to monitor the voltage in real time;the RS422 data communication logic is designed to ensure that the solving device and the sensor system can reliably carry out Data transmission;describes the work flow of the computing device as a remote terminal RT,analyzes in detail the problems and processing methods in the EMIF and LHB155304 read and write timing matching;develops corresponding algorithm programs to achieve angle of attack,side slip angle,dynamic pressure and static Calculation of atmospheric data parameters such as pressure.Finally,a test platform was built to test each functional module and its overall performance.After testing,each module of the solving device works normally.The FLASH bootstrapping can be realized when power is turned on.It can monitor the voltage in real time,and can correctly receive the sensor data through RS422.After the data is solved,the control and telemetry data are uploaded in real time through the 1553 B bus.