High-resolution phased array radar imaging by photonics-based broadband digital beamforming

Gao, Bindong; Zhang, Fangzheng; Zhao, Ermao; Zhang, Daocheng; Pan, Shilong

doi:10.1364/oe.27.013194

Cited by 41 publications

(6 citation statements)

References 21 publications

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“…Other optoelectronic hybrid radar architectures based on the de-chirping mechanism were also reported to further improve the radar performance, such as phased array radar [376] and dual-band LFM CW radar [224], [377], and full-polarimetric radar [378].…”

Section: A Optoelectronic Hybrid Radarmentioning

confidence: 99%

Microwave Photonic Radars

Pan

Zhang

2020

J. Lightwave Technol.

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285

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As the only method for all-weather, all-time and longdistance target detection and recognition, radar has been intensively studied since it was invented, and is considered as an essential sensor for future intelligent society. In the past few decades, great efforts were devoted to improving radar's functionality, precision, and response time, of which the key is to generate, control and process a wideband signal with high speed. Thanks to the broad bandwidth, flat response, low loss transmission, multidimensional multiplexing, ultrafast analog signal processing and electromagnetic interference immunity provided by modern photonics, implementation of the radar in the optical domain can achieve better performance in terms of resolution, coverage, and speed which would be difficult (if not impossible) to implement using traditional, even state-of-the-art electronics. In this tutorial, we overview the distinct features of microwave photonics and some key microwave photonic technologies that are currently known to be attractive for radars. System architectures and their performance that may interest the radar society are emphasized. Emerging technologies in this area and possible future research directions are discussed.

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Section: A Optoelectronic Hybrid Radarmentioning

confidence: 99%

Microwave Photonic Radars

Pan

Zhang

2020

J. Lightwave Technol.

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285

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“…In recent years, many microwave photonic target detection approaches have been investigated. Microwave photonic phased array radar detect multiple targets from different directions sequentially by beamforming [7][8] . However, the direction range is insufficient due to limited beam scanning scope.…”

Section: Introductionmentioning

confidence: 99%

Microwave photonic radar for distance and direction measurement of multiple targets

Wang

Yang

et al. 2022

Infrared, Millimeter-Wave, and Terahertz Technologies IX

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In drone detection and short-range automotive radar, the detection system should have the ability to monitor a large area and to detect the distances and directions of multiple targets. Suffered from electronic bottleneck, it's difficult to achieve a high-performance detection via conventional radar system. Microwave photonics has the advantages of low loss, large bandwidth and so on, and greatly improves the performance of radar system. To realize simultaneous distance and direction detection, microwave photonic phased array radar steers the beam for inertialess and squint-free scanning to detect targets from different directions. However, limited by the narrow angle scanning range, its field of view is inadequate. Photonicsassisted AOA (angle-of-arrival) detection method can detect the direction of target in a large-angle range. Nevertheless, it can hardly obtain the distance information of targets. It is a key issue to preform wide-angle simultaneous detection of distances and directions for multiple targets. We introduce a microwave photonic radar for distance and direction measurement of multiple targets. At the transmitter, a linear frequency modulation signal is generated by photonic frequency doubling and transmitted for detection. At the receiver, echo signals are received by a uniform linear array with three antennas. The intermediate antenna supplies overlapped reference spectra by polarization-multiplexing modulation.The de-chirped spectra possess specific symmetry, thus de-chirped frequencies of each antenna are clearly distinguished and distances and directions of multiple targets can be obtained. Two-target proof-of-concept experiments have verified that the average measurement errors of distance and direction are 2.4 cm and 0.6°, respectively.

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“…For example, in [16], a novel photonic digital-to-analog converter (DAC) was proposed to process a wide bandwidth signal. In [18], a photonic-based broadband phased array radar architecture was proposed using the radar structure with dechirping process to obtain a highresolution target image through digital beamforming. Also, a novel coherent receiver structure was proposed to suppress the image frequencies and other undesired frequency-mixing components in [17].…”

Section: Introductionmentioning

confidence: 99%

“…Also, a novel coherent receiver structure was proposed to suppress the image frequencies and other undesired frequency-mixing components in [17]. However, since the previous researches focused on the method for generating high-frequency and wide bandwidth signals, most of the previous researches have been conducted in a well-controlled laboratory environment with non-realistic targets such as corner reflectors [15]- [18]. In field experiments reported in [19] and [20], a large passenger airplane was used as a target for image acquisition and a commercial hexacopter was just 120 m away from the radar, respectively.…”

Section: Introductionmentioning

confidence: 99%