Synchronous upgrade method for the wireless terminal of underground personnel precise positioning system

When the underground personnel positioning system's firmware is upgraded using the wireless in-application programming (IAP) mode, the mark card can not be used normally, the upgrade efficiency is low and the security is not high. In order to solve the above problems, a synchronous upgrade method for the wireless terminal of the underground personnel precise positioning system is proposed. The architecture of underground personnel precise positioning system and the process of wireless terminal synchronous upgrade method are pointed out. The security design and high concurrency technology implementation of the wireless terminal synchronous upgrade are mainly introduced. Security design: in order to improve the security of air data transmission, advanced encyption standard (AES) encryptor is used to encrypt the data transmission between the card reader and the identification card. In order to ensure the normal operation of the identification card after the wireless upgrade, the message digest algorithm MD5 is introduced to perform integrity verification when the identification card completes receiving and is about to switch. High concurrency technology: the ultra wide band (UWB) wireless communication network with full coverage in the mine is used to extend and compatible the wireless upgrade protocol. The distributed multi-node synchronous upgrade of all underground identification cards is realized. The problem of data switching between nodes in motion is solved by the way of breakpoint continuous transmission. Based on the slotted ALOHA algorithm, a dynamic slot allocation mechanism is proposed to ensure the capacity and response efficiency of the personnel precise positioning system. The test results show that the method can be compatible with the underground personnel precise positioning system. The method can realize the wireless upgrade of the embedded firmware of all wireless terminal positioning identification cards without affecting the system performance indicators. The upgrade success rate is 100%, and the upgrade process is efficient, reliable and safe.