A 24‐GHz radar sensor with a six‐port network for short‐range detection

Yang, Jong‐Ryul; Hong, Songcheol

doi:10.1002/mop.28665

Cited by 6 publications

(5 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…FSK radar distance accuracy is determined using the phase noise of the signal generator and the phase measurement error for each frequency. It should be noted that distance accuracy can deteriorate in the presence of environmental clutter [3,12]. Distinguishing the phase difference for each frequency is indispensable in distance measurements, and the ambiguity of the measurement increases, as shown in Fig.…”

Section: Distance Measurement Using the Proposed Frequency Discrimina...mentioning

confidence: 99%

Frequency Discrimination Method Using Asymmetric Transmission Time in FSK Radar

Sim

Yang

2022

J Electromagn Eng Sci

Self Cite

View full text Add to dashboard Cite

A frequency discrimination method based on transmission time control is proposed for effective absolute distance measurement using frequency-shift keying (FSK) radar. In FSK radar, each frequency is transmitted for different durations using an asymmetric control signal. The phase difference at each frequency is effectively obtained by counting the different numbers of samples obtained after envelope detection in the baseband signal. The proposed method can easily and rapidly distinguish the phase difference for each frequency. This makes it simple to measure the absolute distance up to the maximum unambiguous range. The absolute distance measured using FSK radar with a frequency spacing of 150 MHz showed an accuracy of 97.08% in the full unambiguous range. The distance measurement results prove that the proposed method using FSK radar is useful for presenting the maximum unambiguous range.

show abstract

Section: Distance Measurement Using the Proposed Frequency Discrimina...mentioning

confidence: 99%

Frequency Discrimination Method Using Asymmetric Transmission Time in FSK Radar

Sim

Yang

2022

J Electromagn Eng Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…Figure 4a DC offsets are generated by stationary clutters in the surroundings as well as the imperfection of the hardware configuration of the radar. The FSK radar receives the vector-sum signals reflected from all objects located in the antenna beamwidth [15]. The accuracy of the phase difference can decrease as the measurement distance increases because the DC offsets increase with the amount of clutters received on the radar.…”

Section: Digital Signal Processingmentioning

confidence: 99%

“…In this work, a vital-signs detector with improved accuracy based on frequency-shift keying (FSK) radar technology is proposed. An FSK radar is used for a highly accurate range detection based on the phase difference between the transmitting and receiving signals separately obtained at more than two operating frequencies [ 15 ]. The vital-signs detection in the FSK radar is performed by using the same method as the CW Doppler radar as the FSK radar can be regarded as operating with several CW signals in the same hardware configuration.…”

Section: Introductionmentioning

confidence: 99%

Vital-Signs Detector Based on Frequency-Shift Keying Radar

Sim¹,

Park²,

Yang³

2020

Sensors

Self Cite

View full text Add to dashboard Cite

A frequency-shift keying (FSK) radar in the 2.45-GHz band is proposed for highly accurate vital-signs detection. The measurement accuracy of the proposed detector for the heartbeat is increased by using the cross-correlation between the phase differences of signals at two frequencies used by the FSK radar, which alternately transmits and receives the signals with different frequencies. Two frequencies—2.45 and 2.5 GHz—are effectively discriminated by using the envelope detection with the frequency control signal of the signal generator in the output waveform of the FSK radar. The phase difference between transmitted and received signals at each frequency is determined after calibrating the I / Q imbalance and direct-current offset using a data-based imbalance compensation algorithm, the Gram–Schmidt procedure, and the Pratt method. The absolute-distance measurement results for a human being show that the vital signs obtained at each frequency using the proposed FSK radar have a cross-correlation. The heartbeat detection results for the proposed FSK radar at a distance of < 2.4 m indicate a reduction in the error rate and an increase in the signal-to-noise ratio compared with those obtained using a single operating frequency.

show abstract

“…The described analysis has been used for determining the optimal circle centres distribution for a four-port reflectometer with the use of the following procedure. As mentioned in Section 2, circle centres c 3 and c 4 are required to fulfil conditions (2) and (3). It has to be underlined that |ΔΓ(Γ T )| max depends on the differential phase φ of circle centres c 3 and c 4 , not their absolute phases.…”

Section: Measurement Uncertainty Investigation For Fourport Reflectommentioning

confidence: 99%

“…As an example, one can mention the microwave sensors operating with the use of complex permittivity measurements [2]. Further examples comprise automotive radars [3], accurate microwave displacement sensors [4], and demodulators operating in digital microwave receivers [5].…”

Section: Introductionmentioning

confidence: 99%

Measurement uncertainty analysis and design of a broadband four‐port reflectometer

Odrobina

Staszek

Wincza

et al. 2017

IET Microwaves, Antennas & Propagation

View full text Add to dashboard Cite

An impact of power distribution provided by the four‐port reflectometer network on the uncertainty of complex reflection coefficient measurements is investigated. As a result, parameters of a four‐port reflectometer with theoretically optimal power distribution that ensures the lowest obtainable measurement uncertainty are determined. In addition, a new four‐port reflectometer that allows for achieving the derived optimal parameters over a wide frequency range is proposed. It also features a simple structure; therefore, low‐cost single‐layer microstrip realisation can be easily obtained. To verify the circuit's performance, a broadband four‐port reflectometer operating in 1–3 GHz frequency range has been designed, manufactured, and used for reflection coefficients’ measurements. The obtained results are in a very good accordance with the reference values provided by measurements performed with a commercial vector network analyser.

show abstract

A 24‐GHz radar sensor with a six‐port network for short‐range detection

Cited by 6 publications

References 7 publications

Frequency Discrimination Method Using Asymmetric Transmission Time in FSK Radar

Frequency Discrimination Method Using Asymmetric Transmission Time in FSK Radar

Vital-Signs Detector Based on Frequency-Shift Keying Radar

Measurement uncertainty analysis and design of a broadband four‐port reflectometer

Contact Info

Product

Resources

About