Design of a Low-Cost UWB Time-Domain Radar System for Subcentimeter Image Resolution

Feghhi, Rouhollah; Winter, Robert; Sabzevari, Fatemeh Modares; Rambabu, Karumudi

doi:10.1109/tmtt.2022.3169794

Cited by 11 publications

(4 citation statements)

References 44 publications

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“…Coherent and incoherent receivers are widely used to detect UWB for indoor localization. The coherent receiver mixes the received signal with the local template to the baseband [27][28][29], which requires prior information. The incoherent receiver squares the signal and accumulates its energy over a defined interval using analog hardware [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

A low sampling rate method for the monopole UWB impulse parameter monitoring using waveform transformation

Zhang¹,

Xie²,

Li³

et al. 2023

Meas. Sci. Technol.

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In ultra-wideband (UWB) impulse parameter monitoring, amplitude and pulse width measurements are crucial for detecting and classifying unknown impulse signals. Meanwhile, mass sampling data and the complexity of the current measurement technologies are the limitations of real-time and continuous monitoring. It urges to adopt a simple method that reduces the sampling rate without sacrificing accuracy. This article suggests a novel approach for the monopole UWB by analog signal preprocessing before sampling. A peak detector and integrator are utilized to retain the impulse amplitude and the area inside the impulse for a period, which is the so-called waveform transformation. A low-speed two-channel synchronous ADC samples the output signals from the peak detector and the integrator to determine the amplitude and the area. In the signal process, we demonstrate the concept that pulse width value equals the division of area and amplitude. Due to the distorted amplitude caused by the response time of the peak detector, the relationship between the distorted amplitude, the actual amplitude, and the pulse width is analyzed and examined based on the response function. Finally, the actual amplitude and pulse width are acquired and calculated by solving two equations. In terms of impulse waveform, rectangular and Gaussian waveform factors are developed and applied in the measurement. The proof-of-concept experimental results of a 0.68 V/ 18.8 ns rectangular impulse at a 10 Msps sampling rate is 0.711 V/ 17.00 ns with 4.56 %/ 9.57% relative error, tested and verified.

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Section: Introductionmentioning

confidence: 99%

A low sampling rate method for the monopole UWB impulse parameter monitoring using waveform transformation

Zhang¹,

Xie²,

Li³

et al. 2023

Meas. Sci. Technol.

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show abstract

“…Pulse-based sensing systems have been widely used for many sensing applications, such as location [17]- [20], target detection [21], [22] and imaging [23]- [26]. For communication systems, pulsed signals also have the advantages of low power consumption, high safety and high resistance against the narrowband interference [27]- [29].…”

Section: Introductionmentioning

confidence: 99%

Pulse-Based ISAC: Data Recovery and Ranging Estimation for Multi-Path Fading Channels

Cai

Chen

et al. 2023

IEEE Trans. Commun.

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Pulse-based integrated sensing and communication (ISAC) systems have the advantages of high ranging resolution and strong resistance to self-interference, compared with continuous wave (CW) based systems. However, for pulse-based ISAC systems, multi-path channels pose various challenges to data recovery and ranging by providing diversity gain for data recovery but incurring the interference to the identification of the first path in ranging. In this paper, we design a pulse-based ISAC receiver for multi-path channels. The designed receiver can obtain the diversity gain by correlating the received signal with the estimated template signal. Meanwhile, it can detect the arrival of the first path by using a threshold detection method based on a constant false alarm rate (CFAR). Furthermore, we extend the pulse-based ISAC design to a low-resolution analog-to-digital converter (ADC) scenario. A low-cost receiver design is provided for the pulse-based ISAC system that can recover data and estimate range simultaneously considering the non-linear effect caused by the low-resolution ADC. Simulation results show that compared with the generalized maximum likelihood (GML) based receiver, the proposed full-resolution pulse-based ISAC receiver has 1dB signal-to-noise ratio (SNR) loss in bit error rate (BER) and almost the same mean squared error (MSE) performance with the significantly reduced computational complexity. Also, compared with the full-resolution ISAC receiver, the ISAC receiver with 3-level quantization incurs only 0.8dB SNR loss in BER and 1dB SNR loss in MSE.

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“…Therefore, there is a trend of replacing the existing Wi-Fi and Bluetooth technology, previously used for indoor real-time location systems, with UWB technology, which can be implemented with high accuracy and low cost. For example, localization performance was improved with the method of distinguishing LoS/NLoS propagation [11], and a low-cost localization system was reported with a simple signal processing architecture [12][13][14]. UWB localization operates by converging distance information through time of flight (ToF) and direction information through angle of arrival (AoA) to obtain the location information of a target device or tag.…”

Section: Introductionmentioning

confidence: 99%

Design of a Tripod-Shaped Radiator Patch Antenna for Ultra-Wideband Direction Finding

Youn,

Ohm,

Jang

et al. 2023

Sensors

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As UWB technology develops and devices become smaller, miniaturization techniques for an array antenna system are required. In addition, more in-depth research is needed for UWB direction-finding techniques using channel impulse response (CIR) data. This paper proposes an ultra-wideband (UWB) antenna using a single-radiator multiple-port (SRMP) design for the direction-finding systems of smart devices. The proposed SRMP antenna was designed using a single tripod-shaped patch that can replace the array system. The tripod-shaped radiator was optimized using the edge shape design function to improve its broadband and mutual coupling characteristics. For performance verification, the proposed antenna was fabricated, and the reflection coefficient, mutual coupling, and radiation patterns were measured in a fully anechoic chamber. The proposed antenna has an operating frequency band of 6.1 GHz (from 5.8 GHz to 11.9 GHz) for port 1 and a measured mutual coupling of −14.8 dB at 8 GHz. The SRMP antenna has measured maximum gains of 3.5 dBi for port 1 and 2.9 dBi for port 2. To examine the direction-finding performance, the fabricated antenna was connected to a circuit module with a DW3000 chip, which is widely employed in commercial mobile UWB systems. The direction of arrival (DoA) results using the measured CIR data show root-mean-square (RMS) errors of 1.57° and 4.58° at distances of 30 cm and 60 cm.

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Design of a Low-Cost UWB Time-Domain Radar System for Subcentimeter Image Resolution

Cited by 11 publications

References 44 publications

A low sampling rate method for the monopole UWB impulse parameter monitoring using waveform transformation

A low sampling rate method for the monopole UWB impulse parameter monitoring using waveform transformation

Pulse-Based ISAC: Data Recovery and Ranging Estimation for Multi-Path Fading Channels

Design of a Tripod-Shaped Radiator Patch Antenna for Ultra-Wideband Direction Finding

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