Angular resolution limits for coincidence imaging radar based on correlation theory

Zha, Guofeng; Wang, Hongqiang; Yang, Zhaocheng; Cheng, Yongqiang; Qin, Yuliang

doi:10.1109/icspcc.2015.7338818

Cited by 8 publications

(5 citation statements)

References 12 publications

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“…Notice that the imaging matrix E can be regarded as the superposition of individual sensing matrices generated by corresponding single transmitters, namely E = ∑ N n=1 E n according to (4) and (6), where According to matrix theory, the rank of the imaging matrix E satisfies…”

Section: Time-division Scheme Of Mscimentioning

confidence: 99%

“…By the correlation process between scattering echo and the pre-designed radiation fields, targets within antenna beam can be reconstructed with higher resolution than the Real Aperture Radar (RAR). Previous research has indicated that, MSCI achieves superior imaging performance in staring observation applications and thus has attracted increasing attention in many aspects [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Microwave Staring Correlated Imaging Based on Time-Division Observation and Digital Waveform Synthesis

et al. 2020

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As a newly proposed high resolution computational imaging technique, Microwave Staring Correlated Imaging (MSCI) requires elaborate design of the temporal-spatial stochastic radiation fields (TSSRF). Conventional implementation of MSCI radiation source consists of multiple transmitters configuration and simultaneous emitting scheme, which remains underutilization of the available design resources. In this paper, a time-division MSCI (TD-MSCI) method is proposed to virtually generate the TSSRF and make further use of the available design resources. Different from convention simultaneously transmitting based MSCI, the detection scheme in TD-MSCI is achieved by alternately transmitting of each transmitter, rather than simultaneous transmission of multiple transmitters. Echo enhancement is conducted to improve the SNR level of the echo waveform and to resolve the power coastdown caused by single transmitting scheme. Unused combinations of existing resources are digitally synthesized in computer rather than taking extra observations in actual physical environment. After the processing of time division observation, echo enhancement and digital waveform synthesis, extending TSSRF with better stochastic characteristics are generated, and improved imaging performance is obtained. Numerical imaging experiments and preliminary real-world imaging experiment verify the effectiveness of the proposed TD-MSCI, demonstrating that the proposed method increases the flexibility in radiation source design and decreases the detection costs.

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Section: Time-division Scheme Of Mscimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microwave Staring Correlated Imaging Based on Time-Division Observation and Digital Waveform Synthesis

et al. 2020

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“…Considering requirements of remote sensing and engineering limitations such as bandwidth limitation and power limitation, multitransmitter architecture with simultaneously emitted randomly modulated waveforms is most commonly utilized in MSCI [9,[19][20][21]. Among the different random modulations, random Frequency Hopping (FH) signals are most commonly employed because of the constant-envelope feature and the frequency agility [15,22,23]. An optimization algorithm was adopted to acquire a well-behaved frequency code design of the FH signals based on minimizing the condition number of the sensing matrix [24].…”

Section: Introductionmentioning

confidence: 99%

Microwave Staring Correlated Imaging Method Based on Steady Radiation Fields Sequence

Zhang

Yuan

Jiang

et al. 2020

Sensors

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Microwave Staring Correlated Imaging (MSCI) is a newly proposed computational high-resolution imaging technique. The imaging performance of MSCI with the existence of modeling errors depends on the properties of the imaging matrix and the relative perturbation error resulted from existing errors. In conventional transient-radiation-fields-based MSCI, which is commonly accomplished by utilizing random frequency-hopping (FH) waveforms, the multiple transmitters should be controlled individually and simultaneously. System complexity and control difficulty are hence increased, and various types of modeling errors are introduced as well. The computation accuracy of radiation fields is heavily worsened by the modeling errors, and the transient effect makes it hard to take direct and high-precision measurements of the radiation fields and calibrate the modeling errors with the measuring result. To simplify the system complexity and reduce error sources, in this paper, steady-radiation-fields-sequence-based MSCI (SRFS-MSCI) method is proposed. The multiple transmitters are excited with coherent signals at the same observation moment, with the signal frequency varying in the whole frequency band during the imaging process. By elaborately designing the array configuration and the amplitude and phase sequences of the coherent transmitters, the SRFS-MSCI is thus implemented. Comparing the system architecture of the proposed SRFS-MSCI with the conventional random FH-based MSCI, it can be found that the proposed method significantly reduces the number of baseband modules and simplifies the system architecture and control logic, which contributes to reducing error sources such as baseband synchronization errors and decreasing deterioration caused by error cascade. To further optimize the design parameters in the proposed SRFS-MSCI system, the Simulated Annealing (SA) algorithm is utilized to optimize the amplitude sequences, the phase sequences, and the antenna positions individually and jointly. Numerical imaging experiments and real-world imaging experiment demonstrate the effectiveness of the proposed SRFS-MSCI method that recognizable high-resolution recovery results are obtained with simplified system structure and optimized system parameters.

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“…Based on a uniform one-dimensional (1-D) antenna array and a phase and amplitude modulation signal, the general relationship between the RCI resolution and the deployment of a microwave source was analyzed in [25]. The derivation of the angular-resolution limit of an RCI system is based on a uniform spacing linear array and a frequency random modulation signal [28]. High-resolution RCI requires the reference radiation field to be independent of time and space.…”

Section: Introductionmentioning

confidence: 99%

“…As a novel imaging mode, several problems have been investigated for the RCI method, i.e., RCI with different errors [22], [24], resolution analysis of RCI [28], construction of radiation field [26], [31]. However, current research into RCI has focused on two-dimensional (2-D) coordinates, and this means that the target and radar are in the same plane, and the imaging area is only selected in this plane, which limits the application of RCI in three-dimensional (3-D) coordinates.…”

Section: Introductionmentioning

confidence: 99%

Radar Coincidence Imaging With a Uniform Circular Array

Luo

Zhang

et al. 2020

IEEE Access

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Radar coincidence imaging (RCI), used in conjunction with a uniform circular array (UCA), is presented in this paper. When performing two-dimensional (2-D) imaging for a target, using RCI in conjunction with a uniform linear array (ULA), in three-dimensional (3-D) coordinates, the symmetry phenomenon occurs in certain situation. To overcome this problem, using RCI with a UCA is proposed. First, the symmetry phenomenon of RCI with a ULA and the causes are introduced. Then, the RCI method with a UCA is presented, the signal model is given based on the UCA, and the imaging method is introduced. Finally, the general relationship between the resolution of RCI with a UCA and the independent characteristic of the reference radiation field is analyzed. In view of this, RCI with a UCA has better adaptability to 2-D imaging in 3-D coordinates. Simulation results validate the theoretical analysis and the imaging method. INDEX TERMS Radar coincidence imaging, spatial autocorrelation, symmetrical images, uniform circular array.

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Angular resolution limits for coincidence imaging radar based on correlation theory

Cited by 8 publications

References 12 publications

Microwave Staring Correlated Imaging Based on Time-Division Observation and Digital Waveform Synthesis

Microwave Staring Correlated Imaging Based on Time-Division Observation and Digital Waveform Synthesis

Microwave Staring Correlated Imaging Method Based on Steady Radiation Fields Sequence

Radar Coincidence Imaging With a Uniform Circular Array

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