Reconfigurable Range-Doppler Processing and Range Resolution Improvement for FMCW Radar

Neemat, Sharef; Uysal, Faruk; Krasnov, Oleg A.; Yarovoy, Alexander

doi:10.1109/jsen.2019.2923053

Cited by 20 publications

(10 citation statements)

References 12 publications

(12 reference statements)

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“…3. As the steps will show, working in the time-frequency domain allows for better phase evolution estimations, and opens the possibility to extrapolate frequency slices to compensate for the dead-time region between sweeps as in [17]. The steps are: x Amplitude Receiver 2) Take sweeps from all receivers to the time-frequency domain by applying an STFT, where a sweep can be expressed in matrix form as…”

Section: Method: Sub-bands Sweeps Concatenationmentioning

confidence: 99%

“…We demonstrated in previous work [17] that -for a singlereceiver-channel deramping FMCW radar -the target response function width can be improved by concatenating beat-signals from multiple sweeps in a CPI. In this paper we demonstrate the improvement by concatenating two or more chirps from the same sweep/PRI using multiple receivers, which in essence decouples the CPI processing gain and range-resolution from the Doppler ambiguity interval, at the price of using those multiple deramping receivers.…”

Section: Operational Parameters Decouplingmentioning

confidence: 98%

“…In the figure, the additional samples added to the signal were expressed in terms of time since it was indeed a concatenation along the time axis from two or more sweeps in [17], which in essence increased the integration time.…”

Section: Operational Parameters Decouplingmentioning

confidence: 99%

“…Content may change prior to final publication. When coherently concatenating two -or more -chirps, the sinc function 3 dB width will reduce [17].…”

Section: Operational Parameters Decouplingmentioning

confidence: 99%

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Decoupling the Doppler Ambiguity Interval From the Maximum Operational Range and Range-Resolution in FMCW Radars

et al. 2020

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Classical saw-tooth Frequency Modulated Continuous Wave (FMCW) radars experience a coupling between the maximum unambiguous Doppler-velocity interval, maximum operational range, range-resolution and processing gain. Operationally, a trade-off is often necessarily made between these parameters. In this paper, we propose a waveform and a processing method that decouples the aforementioned parameter dependencies at the price of using multiple receiver channels within the radar. The proposed method exploits the fact that beatfrequency signals have the same baseband frequency, even if the transmitted and received chirps occupy different radio frequency bands, and have different center-frequencies. We concatenate those baseband signals in the time-frequency domain to restore the range-resolution and processing gain. An overview of FMCW parameters trade-off for related waveforms and a feasibility and limitations analysis of implementing the proposed processing method are presented. The method is verified by simulations and experiments with an FMCW radar for stable, moving and extended-moving targets. We additionally have highlighted its non-idealities in the simulations and experiments. We found that the proposed method indeed alleviates the trade-off between FMCW operational parameters and allows the extension of the Doppler ambiguity interval without compromising on those parameters.

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Section: Method: Sub-bands Sweeps Concatenationmentioning

confidence: 99%

Section: Operational Parameters Decouplingmentioning

confidence: 98%

Section: Operational Parameters Decouplingmentioning

confidence: 99%

“…Content may change prior to final publication. When coherently concatenating two -or more -chirps, the sinc function 3 dB width will reduce [17].…”

Section: Operational Parameters Decouplingmentioning

confidence: 99%

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Decoupling the Doppler Ambiguity Interval From the Maximum Operational Range and Range-Resolution in FMCW Radars

et al. 2020

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“…figurable electronic devices introduced by software reconfigurable technology [3]- [5]. This system integrates remote sensor functions including an SAR, altimeter, scatterometer and spectrometer by a software-reconfigurable radar receiver and by steering the antenna side looking with a medium incidence angle, nadir looking, rotating 360 degrees horizontally with a medium incidence angle and switching between two different incidence angles, and rotating 360 degrees horizontally with a small incidence angle, respectively.…”

Section: Introductionmentioning

confidence: 99%

System Parameter Design of Multimodal Small Satellite SARs Operating in Scan Mode and Transmit Power Optimization for Marine Scenes

Zhou¹,

Lv²,

Zhang³

et al. 2020

IEEE Access

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Multimodal small satellite synthetic aperture radar (SAR) is a new radar system under development that integrates an SAR, altimeter, scatterometer, and spectrometer. When applied to marine scenes, this system can be used to measure both marine targets and marine dynamic environments with high precision. This study addresses system parameter design for multimodal small satellite SAR operating in scan mode, and this design provides system parameters such as antenna size, signal bandwidth, pulse repetition frequency, scanning wavenumber and wave position for system simulation in scan mode. A method for optimizing the transmit power when illuminating a marine scene based on the wind speed and wind direction above the sea surface is studied. The goal is to fully use the characteristics of strong sea surface microwave scattering under a suitable wind speed and wind direction to reduce the required transmit power, thus improving the available data sampling time per orbit of a multimodal radar when working in SAR mode. Various simulation experiments were conducted, and the system parameter design results are given under scan mode. Furthermore, imaging simulation results of ocean scenes are also given under conventional and decreased power after optimization. The results show that good ocean scene imaging results are obtained when the designed system parameters are used for system simulation. In addition, the simulation results also verify that when the sea surface wind speed is relatively high and the wind direction is suitable, an acceptable ocean scene imaging result can still be obtained by using reduced transmit power. INDEX TERMS Multimodal small satellite SAR, scan mode, system parameter design, ocean scene imaging simulation, transmission power optimization.

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RT-Pose: A 4D Radar Tensor-Based 3D Human Pose Estimation and Localization Benchmark

Ho,

Cheng,

Kuan

et al. 2024

Lecture Notes in Computer Science

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Reconfigurable Range-Doppler Processing and Range Resolution Improvement for FMCW Radar

Cited by 20 publications

References 12 publications

Decoupling the Doppler Ambiguity Interval From the Maximum Operational Range and Range-Resolution in FMCW Radars

Decoupling the Doppler Ambiguity Interval From the Maximum Operational Range and Range-Resolution in FMCW Radars

System Parameter Design of Multimodal Small Satellite SARs Operating in Scan Mode and Transmit Power Optimization for Marine Scenes

RT-Pose: A 4D Radar Tensor-Based 3D Human Pose Estimation and Localization Benchmark

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