Anti-interference design for dual-core flight control computer based on DSP28335

LUO Qiu-feng1， LI Yong2， GAO Zhen2
（1. Institute of Unmanned Aerial Vehicle， Nanjing University of Aeronautics & Astronautics， Nanjing 210016， China；
2. College of Automation Engineering， Nanjing University of Aeronautics & Astronautics， Nanjing 210016， China）

Abstract：Aiming at reliability of flight control computer in the unmanned aerial vehicle（UAV） adverse electromagnetic environment，dual-core TMS320F28335（DSP28335） structure were designed. The dual-DSP28335 mother board was designed and a powerful flight control computer which had 40 channels（ch） I/O，16ch ADC，6ch PWM/CAP and 15ch serial interfaces was implement，MCU was derated，and the peripheral circuits were simplified. Its logic interface circuits were also simplified by the complex programmable logic device（CPLD） for all decoders and drivers. To increase the system self-recovery，over/under voltage monitor and hardware watchdog methods were proposed. Finally，pin-filter-window noise suppression and boundary protection technique were used to improve further the anti-interference for higher frequency signals and over the limit signals. Jamming signals simulation and 12-hour performance experiments results indicate that the above EMC considerations are valid，and the adaptability of flight control computer in complex electromagnetic environment is remarkably improved.
Key words： unmanned aerial vehicle（UAV）； Dual-DSP28335； anti-interferencere； derating； noise suppression