航天器展开机构压力传感器无线测控系统设计

Design of Wireless measurement and control system for spacecraft deployment pressure sensor

摘要:

传统的航天器展开机构任务压力传感器参数测控系统使用有线的方式，展开过程中存在力轴转动网线跟随缠绕的现象，以往需根据位置调整采集终端，避免网线断裂，使用极不方便，且单点采集，不利于多通道部署和数据集成处理。为了解决上述问题，开发了一种基于ESP8266和LabVIEW的嵌入式分布式无线压力传感器参数测控系统，设计信号调理电路，ADC采集模块，使用ESP8266无线模块多点分布式组网；终端采集软件使用LabVIEW虚拟仪器平台，采用多线程低耦合的QMH队列框架，功能模块化编写，便于开发人员维护，实现设备通讯，传感器校准及数据采集处理等功能；使用PSP服务器动态实时共享试验数据，实现数据的网络快速传递，提高系统的数据处理速度；添加了增量式积分分离PID算法，实现了传动机构与传感器的联动，精确控制压力参数，同时具备数据动态拟合及超限报警等功能。系统运行稳定，数据采集频率和压力控制精度高，具有工程应用价值。

Abstract:

The traditional pressure sensor parament acquisition of spacecraft deployment task uses the wired connection, in the process of deployment, there exists corruption that cables wind with the force axis rotating. Previously, it was necessary to adjust the acquisition terminal according to the cable’s position to avoid cable breakage, which was extremely inconvenient. Besides the system uses single channel acquisition, which was inconvenient to multi-channel acquisition and data integration processing. In order to solve the above problems, an embedded and distributed wireless pressure sensor parameter acquisition system based on ESP8266 and LabVIEW is developed, which designs signal conditioning circuit and ADC acquisition module, uses the ESP8266 wireless module to deploy multi-point distributed networking. The terminal acquisition software is based on LabVIEW virtual instrument platform. Multithreading and low coupling QMH queue software framework is used. Function modules are developed independently to convenience developers to maintenance procedure in parallel. The software is able to realize the equipment communication , sensor calibration and data acquisition and processing, which uses the PSP server to share the test data dynamically and in real time, realizes the rapid data transmission through the network, and improves the data processing speed. The incremental integral separation PID algorithm is added to realize the linkage between the transmission mechanism and the sensor, which accurately controls the pressure parameter. Data dynamic fitting and overrun setting functions are also included. The system is stable in operation, which has high frequency of data acquisition, high control accuracy and engineering application value.