Noise in Homodyne FMCW radar systems and its effects on ranging precision

Thurn, Karsten; Ebelt, Randolf; Vossiek, Martin

doi:10.1109/mwsym.2013.6697654

Cited by 89 publications

(39 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Represented in Figure 11, this type of signal is composed of a unity signal called chirp generated at every period T. The chirp can be generated by feeding a voltage-controlled oscillator (VCO) with a linear control voltage. Alternatively, the chirp can be generated by using a phase-locked-loop (PLL) with frequency synthesizers [136]. The transceiver architectures of FMCW radars are similar to that of CW Doppler ones.…”

Section: Operation Principlementioning

confidence: 99%

Human Vital Signs Detection Methods and Potential Using Radars: A Review

Kebe

Gadhafi

Mohammad

et al. 2020

Sensors

136

View full text Add to dashboard Cite

Continuous monitoring of vital signs, such as respiration and heartbeat, plays a crucial role in early detection and even prediction of conditions that may affect the wellbeing of the patient. Sensing vital signs can be categorized into: contact-based techniques and contactless based techniques. Conventional clinical methods of detecting these vital signs require the use of contact sensors, which may not be practical for long duration monitoring and less convenient for repeatable measurements. On the other hand, wireless vital signs detection using radars has the distinct advantage of not requiring the attachment of electrodes to the subject’s body and hence not constraining the movement of the person and eliminating the possibility of skin irritation. In addition, it removes the need for wires and limitation of access to patients, especially for children and the elderly. This paper presents a thorough review on the traditional methods of monitoring cardio-pulmonary rates as well as the potential of replacing these systems with radar-based techniques. The paper also highlights the challenges that radar-based vital signs monitoring methods need to overcome to gain acceptance in the healthcare field. A proof-of-concept of a radar-based vital sign detection system is presented together with promising measurement results.

show abstract

Section: Operation Principlementioning

confidence: 99%

Human Vital Signs Detection Methods and Potential Using Radars: A Review

Kebe

Gadhafi

Mohammad

et al. 2020

Sensors

136

View full text Add to dashboard Cite

show abstract

“…To ensure the transpolarization of the reflected electromagnetic signal, we arranged the reflector in an appropriate way that the gratings are shifted by 45°to the incident polarization. The maximum achievable accuracy for radar measurements is limited by the Cramer-Rao lower bound σ crlb , which depends on the used bandwidth and the target's signal-to-noise ratio (SNR) [17]. The accuracy of a radar-based range measurement can be calculated using the following equation:…”

Section: B Mm-wave Radarmentioning

confidence: 99%

“…Furthermore, we determined an SNR of ∼86.1 dB. We can use these values to calculate a theoretical standard deviation concerning the minimum measureable gas pressure by means of (5) and (17). The resulting limitations for detecting pressure fluctuations of carbon dioxide for both, the Cramer-Rao lower bound and the used radar system, are shown in Table II.…”

Section: B Mm-wave Radarmentioning

confidence: 99%

Contactless Detection of State Parameter Fluctuations of Gaseous Media Based on an mm-Wave FMCW Radar

Baer

Jaeschke

Pohl

et al. 2015

IEEE Trans. Instrum. Meas.

View full text Add to dashboard Cite

In this contribution, we present an approach on the fluctuation detection of gaseous media concerning their state parameter, i.e., concentration, pressure, and temperature. Dielectric mixing equations that link the gas permittivity with the gas concentration and pressure are introduced and discussed. Furthermore, we prove the small temperature influence on the gas permittivity, because of the obvious temperature-pressure dependence of gaseous media. To verify the suggested gas permittivity theory, a pressure-resistant test container was constructed and built up. By means of a highly precise millimeter-wave radar system, we performed numerous test series on different gases for various investigations. Index Terms-Frequency Modulated Continuous Wave (FMCW) radar, gas permittivity, millimeter wave (mm-wave), mixing equation. Thomas Musch

show abstract

“…Frequency multiplication techniques could translate RF signals into mm-wave signals. But the multiplier chains will degrade the phase noise and the spurs as the increase of multiplication times [3,4].…”

Section: Introductionmentioning

confidence: 99%

Design of a Full-Coherent Millimeter Wave Radar Frequency Synthesizer

Chen¹,

Xu²,

Peng³

2017

Proceedings of the 3rd International Conference on Wireless Communication and Sensor Networks (WCSN 2016)

View full text Add to dashboard Cite

Abstract-In this paper, with the combination of DDS, PLL, multiplier and mixing techniques, a millimeter wave (mm-wave) full-coherent frequency synthesizer with low phase-noise and spurs is developed. It includes a mm-wave source. A linear frequency modulation (LFM) generator and a microwave source serving as the second local oscillator for the receiver. An external 100 MHz temperature-controlled crystal oscillator is used as the coherent clock for all the sources. The phase noise and spurs of the mm-wave signal have been analyzed and estimated. Measured results show that the output frequency is 34.855~34.865 GHz, the stepping frequency is 100 KHz, the output power is larger than 16 dBm, and the phase noise level is about -92 dBc/Hz at an offset of 10 KHz.

show abstract

Noise in Homodyne FMCW radar systems and its effects on ranging precision

Cited by 89 publications

References 5 publications

Human Vital Signs Detection Methods and Potential Using Radars: A Review

Human Vital Signs Detection Methods and Potential Using Radars: A Review

Contactless Detection of State Parameter Fluctuations of Gaseous Media Based on an mm-Wave FMCW Radar

Design of a Full-Coherent Millimeter Wave Radar Frequency Synthesizer

Contact Info

Product

Resources

About