Partially coherent radar unties range resolution from bandwidth limitations

Komissarov, Rony; Kozlov, Vitali; Filonov, Dmitry; Ginzburg, Pavel

doi:10.1038/s41467-019-09380-x

Cited by 33 publications

(19 citation statements)

References 30 publications

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“…This timescale separation method, also referred to as quasistationarity or adiabatic, 10,11 is reminiscent of similar approaches, such as the slowly varying amplitude approximation and short-time Fourier transform methods. 15 These approximations are especially prevalent in applied fields such as radar and sonar, [16][17][18][19] where the typical velocity of scatterers is far smaller than the velocity of the impinging waves. This timescale separation approach, when applicable, is a powerful tool for numeric simulations, as it allows the use of off-the-shelf static simulators in order to solve time-dependent problems (see Refs.…”

Section: Discussionmentioning

confidence: 99%

Memory effects in scattering from accelerating bodies

et al. 2020

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Interaction of electromagnetic, acoustic, and even gravitational waves with accelerating bodies forms a class of nonstationary time-variant processes. Scattered waves contain intrinsic signatures of motion, which manifest in a broad range of phenomena, including Sagnac interference, and both Doppler and micro-Doppler frequency shifts. Although general relativity is often required to account for motion, instantaneous rest frame approaches are frequently used to describe interactions with slowly accelerating objects. We investigate theoretically and experimentally an interaction regime that is neither relativistic nor adiabatic. The test model considers an accelerating scatterer with a long-lasting relaxation memory. The slow decay rates violate the instantaneous reaction assumption of quasistationarity, introducing non-Markovian contributions to the scattering process. Memory signatures in scattering from a rotating dipole are studied theoretically, showing symmetry breaking of micro-Doppler combs. A quasistationary numeric analysis of scattering in the short-memory limit is proposed and validated experimentally with an example of electromagnetic pulses interacting with a rotating wire.

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Section: Discussionmentioning

confidence: 99%

Memory effects in scattering from accelerating bodies

et al. 2020

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“…Besides, the preprocessed radar data can be generated to images by applying the generative adversarial network (GAN) [52]- [55], but the images still confronted with a problem of insufficient resolution. Moreover, with the increasing number of vehicles equipped FMCW radar, the shared frequency interference phenomenon will become a problem, and the reference [56] proposed a new radar ranging system with proper range resolution without bandwidth limitation. Compared with the same type of radar, its resolution is improved by more than an order of magnitude, which will be beneficial to the construction of high-resolution maps by radar.…”

Section: A Millimeter Wave Radarmentioning

confidence: 99%

Multi-Sensor Fusion in Automated Driving: A Survey

2020

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With the significant development of practicability in deep learning and the ultra-highspeed information transmission rate of 5G communication technology will overcome the barrier of data transmission on the Internet of Vehicles, automated driving is becoming a pivotal technology affecting the future industry. Sensors are the key to the perception of the outside world in the automated driving system and whose cooperation performance directly determines the safety of automated driving vehicles. In this survey, we mainly discuss the different strategies of multi-sensor fusion in automated driving in recent years. The performance of conventional sensors and the necessity of multi-sensor fusion are analyzed, including radar, LiDAR, camera, ultrasonic, GPS, IMU, and V2X. According to the differences in the latest studies, we divide the fusion strategies into four categories and point out some shortcomings. Sensor fusion is mainly applied for multi-target tracking and environment reconstruction. We discuss the method of establishing a motion model and data association in multi-target tracking. At the end of the paper, we analyzed the deficiencies in the current studies and put forward some suggestions for further improvement in the future. Through this investigation, we hope to analyze the current situation of multi-sensor fusion in the automated driving process and provide more efficient and reliable fusion strategies.

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“…Further, in typical noise radars with range resolutions below 1m, sampling rates can reach the GHz range. Last, we acknowledge new and interesting ranging topologies that utilize partially coherent sources to allow for increased accuracy when additional bandwidth is not available [36]; similar to noise-based ranging, a random or pseudorandom source is the backbone of these ranging waveforms.…”

Section: Fmcw Limitationsmentioning

confidence: 99%

Generating and Detecting Solvable Chaos at Radio Frequencies with Consideration to Multi-User Ranging

Beal

Cohen

Syed

2020

Sensors

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High entropy waveforms exhibit desirable correlation properties in radar and sonar applications when multiple systems are used in close proximity. Unfortunately, the information content of these signals can impose high sampling requirements for digital detection techniques. Solvable chaotic oscillators have been proposed to address such issues due to their simple, matched filters, where hardware has been demonstrated with a bandwidth of 10–20 kHz. To extend applications of these systems, we present theory, design, and experimental verification of solvable chaos at 1 MHz using simple off-the-shelf components. The waveforms produced by this system were propagated over a 2.45 GHz RF link and detected with an RLC-based, purely analog matched filter. Further, we show that properties of this special class of chaotic systems can be exploited to yield RF noise sources that are generally advantageous for multi-user ranging applications when compared to conventional techniques. The result is a simple, low-cost, and potentially low-power RF ranging system that requires very little digital signal processing.

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Partially coherent radar unties range resolution from bandwidth limitations

Cited by 33 publications

References 30 publications

Memory effects in scattering from accelerating bodies

Memory effects in scattering from accelerating bodies

Multi-Sensor Fusion in Automated Driving: A Survey

Generating and Detecting Solvable Chaos at Radio Frequencies with Consideration to Multi-User Ranging

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