Hardware Design Of High-accuracy Localization System For Staff In High-risk Production Areas

With the development of technology, although the safety level of many manufacture areas inhigh-risk industry has been improved, man-made accidents which were caused by equipment failureor misoperation still occur frequently. To improve equipment safety and enhance the consciousnessof correct operation of staff to avoid these accidents is important. But the rescue of staff after theaccident is also very important. If the distribution of staff in the accident area is known, it will playa great help for the rescue of staff after the accident. Therefore, an effective real time indoorlocation system is very important.This paper introduces and compares several indoor wireless location technology which arewidely used currently such as: RFID (Radio Frequency Identification), UMB (Ultra-Wideband),Zigbee and CSS (Chirp Spread Spectrum). Existing theory shows that, regardless of locationprecision, communication distance or cost of the system of Zigbee and CSS make them suitable topositioning staff in high-risk manufacture areas.This paper use CSS-based RF chip NA5TR1 to design NCSS(NA5TR1-CSS) indoor personnellocation system, which use ATmega128A as its MCU in Ahchor node and Gateway node, and useATmega644V as its MCU in Tag node. Meanwhile, this paper use Zigbee-based RF chip CC2530 todesign the Anchor node and Tag node of CCZB(CC2530-Zigbee) indoor personnel location system,and use Zigbee-based RF chip CC2531 to design the Gateway node of CCZB. This paper design theRF module circuit board and its baseboard separately in order to reduce the size of tag node. Thereare two kinds of baseboard called power supply board and development board. Power supply boardonly provides power, reset buttons and indicator lights to RF module and powered by cell battery.Development board provides communication interface with computers and debug interface inaddition to power RF module, and it can be powered by both battery and power adapter. The RFmodule use connector to connect with its baseboard.This paper design experiment to measure the communication distance, ranging precision anddisplay of real-time location on computers of the nodes in order to test the performance of thesystem, especially NCSS. The results show that both NCSS system and CCZB system can positionindoor mobile staff well.