Different azimuth targets have different Doppler centroid and different time support domain in slide spotlight synthetic aperture radar. Thus, it is hard to weighting window on the echo in slide spotlight mode. This p...
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Different azimuth targets have different Doppler centroid and different time support domain in slide spotlight synthetic aperture radar. Thus, it is hard to weighting window on the echo in slide spotlight mode. This paper proposed an azimuth weighting method of slide spotlight SAR based on subaperture chirp scaling algorithm. Firstly, the subaperture number of the algorithm is discussed based on the shift of Doppler centroid and the pulse repetition frequency(PRF). Secondly, the range cell migration and the remove of the azimuth phase of each subaperture are processed by chirp scaling algorithm independently. At last, the data of each subaperture is combined together, and the azimuth weighting window is applied after an azimuth de-ramp process of the combined data. The computer simulations verify the validity of the proposed algorithm.
In this paper, the effect of the satellite yawing, pitching and rotating to the antenna beam pointing is analyzed. At the same time, how the antenna beam pointing error affecting the imaging quality is interpreted. Th...
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ISBN:
(纸本)9781510822023
In this paper, the effect of the satellite yawing, pitching and rotating to the antenna beam pointing is analyzed. At the same time, how the antenna beam pointing error affecting the imaging quality is interpreted. The most significant effect is that the pointing error will lead to paired echo in the SAR image and the paired echo may submerge the weak target. So in this paper we will present a method based on minimum entropy to compensate the beam pointing error and eliminate the paired echo. Finally, we present some simulation to verify the validity of the compensated method.
Model predictive control (MPC) has attracted wide attention in process industries with its ability to handle constrained multivariable processes. Computational complexity can become a limiting factor when MPC is appli...
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The continuous opinion dynamics with group-based heterogeneous bounded confidences is considered in this paper. Firstly, a slightly modified Hegselmann-Krause model is proposed, and the agents are divided into open-mi...
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We present an opinion formation model in which individuals are supposed to seek a consensus on the truth. All agents are boundedly confident in the sense that an agent communicates with another one if their opinion di...
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Tissue P systems are a class of distributed and parallel computing models inspired from inter-cellular communication and cooperation between cells. In this work, a variant of tissue P system, named tissue P system wit...
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Tissue P systems are a class of distributed and parallel computing models inspired from inter-cellular communication and cooperation between cells. In this work, a variant of tissue P system, named tissue P system with look-ahead mode, is discussed for decreasing the inherent non-determinism of tissue P systems and helping implementing tissue P systems on computers. Such systems are proved to be universal by simulating register machine, and they are also proved to be able to efficiently solve computationally hard problems by means of a spacetime tradeoff, which is illustrated with a polynomial solution to 3-coloring problem.
Considering the accuracy of traditional echo simulation methods, an improved echo simulation method of geosynchronous synthetic aperture radar (GEO SAR) is proposed, which has a higher accuracy. Aiming at the fidelity...
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ISBN:
(纸本)9781510822023
Considering the accuracy of traditional echo simulation methods, an improved echo simulation method of geosynchronous synthetic aperture radar (GEO SAR) is proposed, which has a higher accuracy. Aiming at the fidelity of echo simulation, this article develops a target scene model based on curved surface and an algorithm for judging whether the targets are illuminated by the beam. The echo simulation method is conducted with GEOSAR parameters, which indicates the correctness of scene model and beam judging algorithm. What's more, the effect of scene model and judging algorithm on imaging algorithm is analyzed. And the approach in this paper has a significant meaning for the investigation of space-borne SAR echo simulation and imaging algorithm.
This paper presents a simple but effective sentence-length informed method to select informative sentences for active learning (AL) based SMT. A length factor is introduced to penalize short sentences to balance the &...
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The traditional PHD tracker(PHDT) generates the newborn PHD from the prior knowledge, thus can not be applied when the prior newborn target knowledge is unavailable. To this end, we propose a historical information fe...
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ISBN:
(纸本)9781479947249
The traditional PHD tracker(PHDT) generates the newborn PHD from the prior knowledge, thus can not be applied when the prior newborn target knowledge is unavailable. To this end, we propose a historical information feedback multiple-target tracker(HIFMTT) as an improvement to the traditional PHDT. The HIFMTT generates the newborn PHD through processing the historical observation and estimating results with a feedback structure, and thus can overcome the above mentioned difficulty. For the real application, we also construct the PF-HIFMTT algorithm by embedding the particle filter into the HIFMTT framework. The simulation results demonstrate the effectiveness of the PF-HIFMTT algorithm in two different scenarios.
The ultra-weak luminescence (UWL) feature of plant seeds is investigated. Before UWL measurement, the maize seeds are moistened in distilled water for various periods, which are 2h, 4h, 6h and 8h. And then the seeds a...
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