Pub Date : 2020-01-01DOI: 10.1109/WiSNeT46826.2020.9037618
Jing Wang, Daniel Nolte, T. Karp, J. Muñoz-Ferreras, R. Gómez‐García, Changzhi Li
Spectrum-efficient frequency shift keying (FSK) radar has been investigated previously for range tracking and localization of both moving and stationary human targets. Traditionally, both in-phase (I) and quadrature (Q) channels are used for range tracking of moving targets using FSK radar. In this paper, a single channel moving target tracking method is proposed, which brings the benefit of reduced circuit complexity at the trade-off of half of the maximum unambiguous range. Range tracking theory including quadrature channel demodulation, single channel demodulation, and phase difference correction are discussed. Simulation is provided to validate the proposed tracking method. Experiments demonstrate that the target trajectory can be successfully measured with the proposed single channel tracking method if it is within half maximum unambiguous range of an I/Q channel system, while the range estimation will be inaccurate if the target movement is beyond the limit of half maximum unambiguous range.
{"title":"Trade-off on Detection Range and Channel Usage for Moving Target Tracking using FSK Radar","authors":"Jing Wang, Daniel Nolte, T. Karp, J. Muñoz-Ferreras, R. Gómez‐García, Changzhi Li","doi":"10.1109/WiSNeT46826.2020.9037618","DOIUrl":"https://doi.org/10.1109/WiSNeT46826.2020.9037618","url":null,"abstract":"Spectrum-efficient frequency shift keying (FSK) radar has been investigated previously for range tracking and localization of both moving and stationary human targets. Traditionally, both in-phase (I) and quadrature (Q) channels are used for range tracking of moving targets using FSK radar. In this paper, a single channel moving target tracking method is proposed, which brings the benefit of reduced circuit complexity at the trade-off of half of the maximum unambiguous range. Range tracking theory including quadrature channel demodulation, single channel demodulation, and phase difference correction are discussed. Simulation is provided to validate the proposed tracking method. Experiments demonstrate that the target trajectory can be successfully measured with the proposed single channel tracking method if it is within half maximum unambiguous range of an I/Q channel system, while the range estimation will be inaccurate if the target movement is beyond the limit of half maximum unambiguous range.","PeriodicalId":394796,"journal":{"name":"2020 IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNeT)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125472523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.1109/WiSNeT46826.2020.9037619
F. Alimenti, V. Palazzi, P. Mezzanotte, L. Roselli
This work presents a passive temperature sensor, able to encode a temperature variation in a phase variation. This is achieved combining, for the first time, a reflection-type phase shifter and a bimorph cantilever. The sensor is intended to be part of a passive wireless harmonic transponder able to retrieve the sensor information from the phase difference between the signals re-transmitted in vertical and horizontal polarizations. The temperature-controlled phase shifter is firstly designed and modeled. Then, a prototype, working at 2 GHz, is manufactured assembling the bimorph cantilever with a planar microstrip circuit and tested. A phase difference of about 47circ is observed for a temperature variation from $25^{circ}{C}$ to $50^{circ}{C}$, showing the high sensitivity of the proposed device, which opens the door to a new class of passive phase-encoded sensors.
{"title":"Zero-Power Temperature Sensor for Wireless Harmonic Systems based on a Reflection-type Phase Shifter and a Bimorph Cantilever","authors":"F. Alimenti, V. Palazzi, P. Mezzanotte, L. Roselli","doi":"10.1109/WiSNeT46826.2020.9037619","DOIUrl":"https://doi.org/10.1109/WiSNeT46826.2020.9037619","url":null,"abstract":"This work presents a passive temperature sensor, able to encode a temperature variation in a phase variation. This is achieved combining, for the first time, a reflection-type phase shifter and a bimorph cantilever. The sensor is intended to be part of a passive wireless harmonic transponder able to retrieve the sensor information from the phase difference between the signals re-transmitted in vertical and horizontal polarizations. The temperature-controlled phase shifter is firstly designed and modeled. Then, a prototype, working at 2 GHz, is manufactured assembling the bimorph cantilever with a planar microstrip circuit and tested. A phase difference of about 47circ is observed for a temperature variation from $25^{circ}{C}$ to $50^{circ}{C}$, showing the high sensitivity of the proposed device, which opens the door to a new class of passive phase-encoded sensors.","PeriodicalId":394796,"journal":{"name":"2020 IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNeT)","volume":"394 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133340098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.1109/WiSNeT46826.2020.9037615
T. Abe, Y. Yamao
Automotive and marine radars require high dynamic range and high resolution to identify multiple targets. This paper proposes a novel digital signal processing (DSP) radar transceiver implementation design that consists of a multi-bit quadrature $Delta-Sigma$ modulator transmitter and a mismatched filter receiver. It can achieve high dynamic range with moderate oversampling frequency while relaxing the requirement for digital-to-analog converter (DAC) resolution. The simulation results for linear FM chirp radar show that the proposed transceiver with 3-bit DACs can achieve high dynamic range of more than 75 dB in range pulse response. The performance of the proposed transceiver has been validated by experiments.
{"title":"High Dynamic Range DSP Chirp Radar Transceiver Employing Multi-bit ͤ-Σ Modulator","authors":"T. Abe, Y. Yamao","doi":"10.1109/WiSNeT46826.2020.9037615","DOIUrl":"https://doi.org/10.1109/WiSNeT46826.2020.9037615","url":null,"abstract":"Automotive and marine radars require high dynamic range and high resolution to identify multiple targets. This paper proposes a novel digital signal processing (DSP) radar transceiver implementation design that consists of a multi-bit quadrature $Delta-Sigma$ modulator transmitter and a mismatched filter receiver. It can achieve high dynamic range with moderate oversampling frequency while relaxing the requirement for digital-to-analog converter (DAC) resolution. The simulation results for linear FM chirp radar show that the proposed transceiver with 3-bit DACs can achieve high dynamic range of more than 75 dB in range pulse response. The performance of the proposed transceiver has been validated by experiments.","PeriodicalId":394796,"journal":{"name":"2020 IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNeT)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122693852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.1109/WiSNeT46826.2020.9037604
Yu-Chih Chen, Alexsander I-Chi Lai, R. Wu
A high-precision positioning prototype suitable for the Unmanned Aircraft System Traffic Management (UTM) system is proposed. Comprised of Global Positioning System (GPS), Ultra-wideband (UWB), and Long Range (LoRa) WAN capabilities, our prototype effectively improves GPS accuracy by utilizing high-precision UWB distance measurement. A set of calibration procedures can reduce the error of UWB distance measurement within 10cm accuracy. Moreover, a novel cost function is proposed so that the longitude, latitude, and relative height errors of GPS can be effectively improved, with relative altitude error reduced from 4. 03m to 1. 74m in particular. Finally, our UWB-assisted positioning prototype significantly enhances GPS localization accuracy. The outdoor relative position error between devices under test (DUTs) can be reduced from 6 m to within 10 cm.
{"title":"UWB-Assisted High-Precision Positioning in a UTM Prototype","authors":"Yu-Chih Chen, Alexsander I-Chi Lai, R. Wu","doi":"10.1109/WiSNeT46826.2020.9037604","DOIUrl":"https://doi.org/10.1109/WiSNeT46826.2020.9037604","url":null,"abstract":"A high-precision positioning prototype suitable for the Unmanned Aircraft System Traffic Management (UTM) system is proposed. Comprised of Global Positioning System (GPS), Ultra-wideband (UWB), and Long Range (LoRa) WAN capabilities, our prototype effectively improves GPS accuracy by utilizing high-precision UWB distance measurement. A set of calibration procedures can reduce the error of UWB distance measurement within 10cm accuracy. Moreover, a novel cost function is proposed so that the longitude, latitude, and relative height errors of GPS can be effectively improved, with relative altitude error reduced from 4. 03m to 1. 74m in particular. Finally, our UWB-assisted positioning prototype significantly enhances GPS localization accuracy. The outdoor relative position error between devices under test (DUTs) can be reduced from 6 m to within 10 cm.","PeriodicalId":394796,"journal":{"name":"2020 IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNeT)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122765249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.1109/WiSNeT46826.2020.9037593
M. Gardill, Johannes Schwendner, Jonas Fuchs
An approach to wireless synchronization between two commercial 77 GHz automotive FMCW radar sensors is shown. Our focus is the alignment of a passive listening sensor to a second active transmitting sensor in frequency, time, and waveform modulation parameters, just by observing the signals transmitted from the active sensor. We show that using a combination of inter- and intra-chirp-sequence synchronization, the active sensor’s signal can be successfully de-ramped for fast-chirp-sequence waveforms with 275 MHz of bandwidth. In addition, we discuss timing requirements and challenges, and characterize the remaining synchronization errors by an analysis of the IF signal data matrix of the de-ramped waveform.
{"title":"An Approach to Over-the-air Synchronization of Commercial Chirp-Sequence Automotive Radar Sensors","authors":"M. Gardill, Johannes Schwendner, Jonas Fuchs","doi":"10.1109/WiSNeT46826.2020.9037593","DOIUrl":"https://doi.org/10.1109/WiSNeT46826.2020.9037593","url":null,"abstract":"An approach to wireless synchronization between two commercial 77 GHz automotive FMCW radar sensors is shown. Our focus is the alignment of a passive listening sensor to a second active transmitting sensor in frequency, time, and waveform modulation parameters, just by observing the signals transmitted from the active sensor. We show that using a combination of inter- and intra-chirp-sequence synchronization, the active sensor’s signal can be successfully de-ramped for fast-chirp-sequence waveforms with 275 MHz of bandwidth. In addition, we discuss timing requirements and challenges, and characterize the remaining synchronization errors by an analysis of the IF signal data matrix of the de-ramped waveform.","PeriodicalId":394796,"journal":{"name":"2020 IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNeT)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129480668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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