Ultra Wideband Sensor Network for Industrial IoT
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1 Sergey B. Makarov Sergey V. Volvenko Sergey V. Zavjalov Alexander S. Gruzdev Andrey V. Rashich Evgeniy L. Svechnikov
2 Objective Development of UWB sensor network for data collection (industrial IoT). Different sensors of engine (7): 6 UWB transmitter for 6 thermal sensors; 1 UWB transmitter for 2 frequency sensors, thermal sensor, 2 pressure sensors. The automatic control and operating engine unit: 1) Receiving information from the sensors and controls, processing the information received. 2) Measurement of the engine parameters using multiple sensors. Requirements : Extreme low-power wireless data transmission technology operating in conditions of high interference. Harvesting energy from heat radiated by the engine. Transmitters implementation on controllers. Modulation «On-Off Keing», asynchronous transfer. 1
3 Objective 2
4 Why UWB signals? Many metal surfaces: Interferences, Reflections. Low signal-to-noise ratio. Requirements of extreme low-power transmitters (energy harvesting by thermal gradient). Narrow-band systems (Bluetooth, ZigBee, etc) not very effective in such conditions => UWB signals. 3
5 Physical layer packet and data link frame Preamble L elements Data link frame (max 61 bits) ID Data CRC 4 bits max 49 bits 8 bits N b bits Spread sequence application (32 elements) Physical layer packet Data 32N b elements (L + 32N b ) elements Repetition of each physical layer packet of up to 4 times with a random pause between repetitions! 4
6 Simulation model Data Preamble search Calculating and adding a checksum Spreading sequence application Received data Verifying a checksum Packet Receiver Signal from Energy Detection unit {±1} Array of received samples Shift array Record the received value to the array x Preamble Adding a preamble UWB modulator Preamble search Energy Detection Preamble found / Preamble not found The adder over preamble length Decision unit Threshold 5
7 Simulation results The preamble in this case is 1000 elements long 6
8 Experimental setup UWB transmitter: microcontroller STM32F401. The period of the UWB pulses = 1 microseconds. 60x50x20 mm 3 7
9 Experimental setup Signal recording: oscilloscope Agilent Technologies DSO9104A. Receiver: Nexsys4 DDR board. 8
10 Experimental setup FPGA part of UWB receiver on the Nexsys4 DDR board based on the latest FPGA Artix-7. start bit_in reset_comparator Timing synchronization block channel bits Detector channel bits Spread sequence demodulator info bits Checksum calculator info bits clk100mhz 125 MHz clock generator Reset generator clk125mhz srst UART transmitter data to host PC 9
11 Experimental setup (Laboratory) Power source. 6 UWB transmitter for thermal sensors + antennas. 1 UWB transmitter for: 2 frequency sensors, thermal sensor, 2 pressure sensors + antenna. Oscilloscope Agilent Technologies DSO9104A. Receiving antenna + LNA, ED, D-trigger. FPGA Artix-7. PC. Distance: 1 meter. 10
12 Experimental results Distance 1 meter. 7 UWB transmitters.3 repetition of each packet. Processing records in Matlab simulation model. UWB transmitter Received packets (correct CRC) 4/4 2/4 1/4 2/4 2/4 1/4 2/4 11
13 Experimental results ID = «0001». Data = « ». CRC = « ». 12
14 Experimental results 7 UWB transmitters.3 repetition of each packet. Processing in FPGA Real engine Thermal sensor 1 Total packets: Packets with errors: 0 Missing packets: 0 Thermal sensor 2 Total packets: Packets with errors: 0 Missing packets: 1 Thermal sensor 3 Total packets: Packets with errors: 0 Missing packets: 0 Distance 1 meter Thermal sensor 4 Total packets: Packets with errors: 1 Missing packets: 1 Thermal sensor 5 Total packets: Packets with errors: 1 Missing packets: 0 Thermal sensor 6 Total packets: Packets with errors: 1 Missing packets: 0 1 UWB transmitter for: 2 frequency sensors, thermal sensor, 2 pressure sensors Total packets: Packets with errors: 0 Missing packets: 0 13
15 Problems and Directions of development Increasing number of sensors (32). Transition to a distributed UWB sensor network: Network layer? Routing rules? Performance requirements for routing nodes? Resulting network performance? 14
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