基于QNX SDP的机载测量数据采集系统

Based on QNX SDP of Airborne Survey Data Acquisition System

摘要:

航空机载测量数据采集是一种长时间、高效率数据采集过程,需要完成机载任务单元多通道数据的不间断采集,传统的机载测量数据采集系统需要进行多次断电和重新上电工作,不能丢失通电条件下保存的数据,一旦机载任务单元通道突然断电,导致通电条件下数据大量丢失,无法完成机载测量数据的准确采集；设计了一种基于QNX SDP的机载测量数据采集系统,分析了系统硬件数字电路和模拟电路的抗干扰设计,系统软件由采集初始化模块、数据采集模块以及QNX SDP系统时钟定时模块构成,3个模块通过QNX SDP进程管理器基于优先级进行合理调控,分析了基于QNX SDP的PWU人机界面模块组成和主要实现的任务,实现了用户和系统的实时机载测量数据交互；实验结果说明,所设计系统可实现ARINC429机载测量数据的有效采集,并给出ARINC429数据波形图,该系统具有较低的花费、较高的采集效率和精度,在机载测量数据实时采集应用中具有较好的通用性和扩展性。

Abstract:

Airborne survey data collection is a long time, high efficiency data acquisition process, you need to complete the airborne task unit multi-channel data continuous acquisition, traditional airborne measuring power data acquisition system is the need for many times and again on the electrical work, under the condition of not lost electricity saved data, once airborne task unit channel suddenly loses power, lead to a large number of missing, under the condition of electricity data cannot complete airborne measuring the accuracy of the data acquisition. Design a based on QNX SDP of airborne survey data collection system, analyses the system hardware antijamming design of digital circuit and analog circuit, system software consists of initialization module, data acquisition module and QNX SDP system clock timer modules, three modules by QNX SDP process manager based on priority and reasonable regulation and analyzed based on QNX SDP PWU man-machine interface module composition and main task, realize the user and the system of airborne survey data interaction in real time. Experimental results indicate that the designed system can realize the effective ARINC429 onboard measurement data acquisition, and ARINC429 data waveform graph is given, the system has lower cost, higher collection efficiency and precision of the application of airborne survey data real time acquisition has good versatility and expansibility. 