We discuss the history and lessons learned from a series of deployments of environmental sensors ... more We discuss the history and lessons learned from a series of deployments of environmental sensors measuring soil parameters and CO2 fluxes over the last fifteen years, in an outdoor environment. We present the hardware and software architecture of our current Gen-3 system, and then discuss how we are simplifying the user facing part of the software, to make it easier and friendlier for the environmental scientist to be in full control of the system. Finally, we describe the current effort to build a large-scale Gen-4 sensing platform consisting of hundreds of nodes to track the environmental parameters for urban green spaces in Baltimore, Maryland.
2021 IEEE Wireless Communications and Networking Conference (WCNC), 2021
Ultra-wideband (UWB) is becoming a major localization technology enabler for the indoor environme... more Ultra-wideband (UWB) is becoming a major localization technology enabler for the indoor environment. Traditional localization systems rely on time-of-arrival (ToA)-based methods such as two-way ranging (TWR) and time difference of arrival (TDoA). Such solutions cannot scale due to interference from multiple devices sharing the same part of the wireless spectrum. One solution is to use concurrent transmissions for a more efficient use of air time. Concurrency-based localization systems that utilize ToA cannot satisfy the accuracy requirements of many applications due to hardware time scheduling limitations. Angle of Arrival (AoA) is a promising solution that can provide scalability and accuracy when used in a concurrent transmission scheme. UWB radio platforms like Decawave DWM1002 with dual-UWB-chip design have made it possible to accurately measure AoA by calculating the phase difference of arrival (PDoA). State-of-the-art AoA estimation has then been extended to build self-localiz...
2020 International Conference on COMmunication Systems & NETworkS (COMSNETS), 2020
Ultra Wideband technology has been presented as a precise and accurate solution for wireless rang... more Ultra Wideband technology has been presented as a precise and accurate solution for wireless ranging. However, the noise and errors created from the low-cost, off-the-shelf UWB devices have been a challenge. Therefore, a comprehensive characterization of these errors is required for these devices to work more efficiently in real applications. This paper will cover the characterization of errors in different environment and configurations, a zscore-based error estimation and correction method for LOS scenarios, and evaluation of its performance. The result shows errors with a maximum mean of 5cm after the proposed correction.
With the advancement of low-power and low-cost wireless technologies in the past few years, the I... more With the advancement of low-power and low-cost wireless technologies in the past few years, the Internet of Things (IoT) has been growing rapidly in numerous areas of Industry 4.0 and smart homes. With the development of many applications for the IoT, indoor localization, i.e., the capability to determine the physical location of people or devices, has become an important component of smart homes. Various wireless technologies have been used for indoor localization including WiFi, ultra-wideband (UWB), Bluetooth low energy (BLE), radio-frequency identification (RFID), and LoRa. The ability of low-cost long range (LoRa) radios for low-power and long-range communication has made this radio technology a suitable candidate for many indoor and outdoor IoT applications. Additionally, research studies have shown the feasibility of localization with LoRa radios. However, indoor localization with LoRa is not adequately explored at the home level, where the localization area is relatively sma...
We discuss the history and lessons learned from a series of deployments of environmental sensors ... more We discuss the history and lessons learned from a series of deployments of environmental sensors measuring soil parameters and CO2 fluxes over the last fifteen years, in an outdoor environment. We present the hardware and software architecture of our current Gen-3 system, and then discuss how we are simplifying the user facing part of the software, to make it easier and friendlier for the environmental scientist to be in full control of the system. Finally, we describe the current effort to build a large-scale Gen-4 sensing platform consisting of hundreds of nodes to track the environmental parameters for urban green spaces in Baltimore, Maryland.
2021 IEEE Wireless Communications and Networking Conference (WCNC), 2021
Ultra-wideband (UWB) is becoming a major localization technology enabler for the indoor environme... more Ultra-wideband (UWB) is becoming a major localization technology enabler for the indoor environment. Traditional localization systems rely on time-of-arrival (ToA)-based methods such as two-way ranging (TWR) and time difference of arrival (TDoA). Such solutions cannot scale due to interference from multiple devices sharing the same part of the wireless spectrum. One solution is to use concurrent transmissions for a more efficient use of air time. Concurrency-based localization systems that utilize ToA cannot satisfy the accuracy requirements of many applications due to hardware time scheduling limitations. Angle of Arrival (AoA) is a promising solution that can provide scalability and accuracy when used in a concurrent transmission scheme. UWB radio platforms like Decawave DWM1002 with dual-UWB-chip design have made it possible to accurately measure AoA by calculating the phase difference of arrival (PDoA). State-of-the-art AoA estimation has then been extended to build self-localiz...
2020 International Conference on COMmunication Systems & NETworkS (COMSNETS), 2020
Ultra Wideband technology has been presented as a precise and accurate solution for wireless rang... more Ultra Wideband technology has been presented as a precise and accurate solution for wireless ranging. However, the noise and errors created from the low-cost, off-the-shelf UWB devices have been a challenge. Therefore, a comprehensive characterization of these errors is required for these devices to work more efficiently in real applications. This paper will cover the characterization of errors in different environment and configurations, a zscore-based error estimation and correction method for LOS scenarios, and evaluation of its performance. The result shows errors with a maximum mean of 5cm after the proposed correction.
With the advancement of low-power and low-cost wireless technologies in the past few years, the I... more With the advancement of low-power and low-cost wireless technologies in the past few years, the Internet of Things (IoT) has been growing rapidly in numerous areas of Industry 4.0 and smart homes. With the development of many applications for the IoT, indoor localization, i.e., the capability to determine the physical location of people or devices, has become an important component of smart homes. Various wireless technologies have been used for indoor localization including WiFi, ultra-wideband (UWB), Bluetooth low energy (BLE), radio-frequency identification (RFID), and LoRa. The ability of low-cost long range (LoRa) radios for low-power and long-range communication has made this radio technology a suitable candidate for many indoor and outdoor IoT applications. Additionally, research studies have shown the feasibility of localization with LoRa radios. However, indoor localization with LoRa is not adequately explored at the home level, where the localization area is relatively sma...
Uploads
Papers