Strong rebar echo which can't be eliminated in tx domain directly will disturb the detection and discrimination of the interested targets like cryptic disasters. This paper presents the application of Hyp-curvelet...
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An algorithm for detection of the air maneuvering target based on the reconstruction of time sampling is proposed. Space sampling is used to reconstruct time sampling, which is equivalent to increasing the number of t...
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Aiming at the problem of high false alarm rate and missing rate with single detection method, an improved target detection algorithm for crashed plane detection is proposed in this paper. The method firstly detects th...
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In this paper we propose a method to estimate the InSAR interferometric phase using the correlation weight subspace projection technique. In the method the correlation weight data vector is constructed, thus the noise...
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An algorithm for detection of the air maneuvering target based on the reconstruction of time sampling is proposed. Space sampling is used to reconstruct time sampling, which is equivalent to increasing the number of t...
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An algorithm for detection of the air maneuvering target based on the reconstruction of time sampling is proposed. Space sampling is used to reconstruct time sampling, which is equivalent to increasing the number of time sampling in one array element. So the problem that the estimation precision is low when using the fractional Fourier transform (FRFT) directly is solved, which is caused by the limited pulses transmitted by the airborne radar in a Coherent processing Interval (CPI). This algorithm improves the estimate precision significantly. Simulation results are provided to testify its validity.
Strong rebar echo which cant be eliminated in t-x domain directly will disturb the detection and discrimination of the interested targets like cryptic disasters. This paper presents the application of Hyp-curvelet tra...
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ISBN:
(纸本)9781424484447
Strong rebar echo which cant be eliminated in t-x domain directly will disturb the detection and discrimination of the interested targets like cryptic disasters. This paper presents the application of Hyp-curvelet transform in detecting and suppressing rebar echo. Echoes from different targets are concentrated in their own apex coordinate but separated with each other in Hyp-curvelet space after transformed. The peak value in Hyp-curvelet space indicates the location of target. With some discrimination algorithm rebars location could be obtained, and then its components in Hyp-curvelet space can be eliminated. In this way the reconstructed data will not contain rebar echo. Simulation results show that targets can be detected in low SNR condition, and rebar echo is rarely left over and diseases echoes are hardly any damaged in reconstructed data.
Because the power of GPS signal received by the GPS receiver is far lower than the receiver noise, GPS signal is susceptible to interferences from either intentional or unintentional sources. A blind adaptive GPS inte...
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Because the power of GPS signal received by the GPS receiver is far lower than the receiver noise, GPS signal is susceptible to interferences from either intentional or unintentional sources. A blind adaptive GPS interference suppression algorithm is proposed in this paper. Firstly, the weight vector obtained by power inverse algorithm is selected as the initial weight vector in the new method, and then the simplified despread respread technique is used to update the weight vector, which will improve the convergence speed and reduce computation of despread respread technique. The new algorithm is close coupling to the conventional GPS receiver and is easy for engineer realization. Simulation experiment results show the effectiveness of the new algorithm.
In this paper, a two stage GPS anti-jamming processor based on subspace and self-coherent property of the C/A code is proposed. Firstly, the array received signals are projected onto the interference orthogonal subspa...
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In this paper, a two stage GPS anti-jamming processor based on subspace and self-coherent property of the C/A code is proposed. Firstly, the array received signals are projected onto the interference orthogonal subspace to suppress interferences. Then direction of arrival (DOA) of GPS signal is obtained by self-coherent MUSIC and the free interference signals are synthesized by self-coherent estimated DOA. The new anti-jamming method could play the respective advantages of each stage. Simulation experiment results show the effectiveness of the new algorithm.
Void-layer detection and thickness determination in runways are studied in this paper. Void-layer is thin layer whose thickness is very small (usually less than 1cm). Firstly, the void-layer can be detected based on i...
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Void-layer detection and thickness determination in runways are studied in this paper. Void-layer is thin layer whose thickness is very small (usually less than 1cm). Firstly, the void-layer can be detected based on its time-frequency distribution characteristic — S transform. This is the first attempt of S transform to be used in the void-layer detection of runways. In the same time, the depth of void-layer can be evaluated based on spectrum optimisation inversion method, in which the impulse pair in the time domain corresponding to the upper and bottom interface of void-layer can be extracted based on the EM wave propagation model and improved system identification method we have proposed in other paper. The simulation results demonstrate the proposed method is valid and the estimation error of thickness is within 5％.
Shadows in images always cause problems to computer visual tasks,so how to remove shadow is an important topic of image *** this paper,we propose a new shadow removal method based on Retinex *** firstly use the gradie...
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ISBN:
(纸本)9781457718342
Shadows in images always cause problems to computer visual tasks,so how to remove shadow is an important topic of image *** this paper,we propose a new shadow removal method based on Retinex *** firstly use the gradient edge detection combined with 1-D illumination invariant image to detect the shadow area,then remove the shadow with Retinex algorithm,finally adjust the brightness of the shadow *** transforming the RGB image into HSV space,we compute the average brightness of the non-shadow area in original image and shadow-free image,adjust the brightness of the image to coordinate with the original *** experiment results show that our method can provide a good effect in shadow images.
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