The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, we demonstrate a new three dimensional (3D) randomly distributed antenna array for microwave staring correlated imaging. Its construction method is presented and the imaging model based on it is established; In order to characterize its random spatial arrangement of array antennas quantitatively, 3D random distributed entropy is defined; Based on the optimal model of maximizing the...
In order to reduce imaging time of complex targets in a large scene, an efficient strip-mode microwave correlated imaging method with data fusion is proposed. Due to its rangegate feature, while random radiation radar array transmits narrow-pulse random signals synchronously, the whole imaging area can be divided into multiple imaging strips in the range direction. By analyzing the temporal-spatial...
A fast correlated imaging method based on strip division in large scenes is proposed. By transmitting narrow-pulse random signals synchronously from random radiation radar array, the whole imaging area is divided into multiple strips in range direction, then correlated imaging model in strip mode is established, which reduces the scale of its imaging matrix equation greatly; By multi-strip stitching,...
In order to enhance the temporal-spatial stochastic characteristics of stochastic radiation fields, a new microwave staring correlated imaging method based on random linear frequency modulation with different rates is proposed, where microwave pulse signals emitted by different elements of stochastic radiation radar array have the same pulse periods and repetition frequencies, however, each pulse...
In optical satellite networks with multi-wavelengths and multi-subcarriers, two-level switching mode replace single wavelength switching, achieving better flexibility and network performance with its disadvantages of more complex routing and network resource allocation. Based on subcarrier layered-graph (SL-G), a novel dynamic routing and wavelength/subcarrier assignment (RWSA) algorithm is proposed...
This paper focuses on the correlation algorithm to realize high-resolution microwave staring correlated imaging (MSCI) in condition of large imaging area. Firstly, the imaging model applied in remote sensing is established, and the reduction of resolution caused by large imaging area is analysed. To solve the problem, we use multigrid (MG) method to solve the imaging equation in different scales,...
According to target sparsity in observation scene, a novel scheme of microwave staring correlated imaging based on compressed sensing (MSCI-CS) is proposed with its established imaging model. As its imaging base and key element, the formation and specific meaning and characteristics of sensing matrix of temporal-spatial stochastic radiation fields (SM-TSSRF) are analyzed, while a new average cross-correlation...
For microwave staring correlated imaging method, high-precision requirement of time synchronization between stochastic radiation fields and scattered echo signals must be satisfied. In order to reduce its influence on microwave correlated imaging results, a novel microwave staring correlated imaging scheme is proposed based on short-time integral stochastic radiation fields. Then the short-time integral...
We report on an experimental study of a stabilized single-mode, linearly polarized, erbium-doped fiber laser with an unique structure of double-cavities. In its linear cavity, the effect of spatial-hole burning (SHB) is eliminated to prevent multi-longitudinal-mode oscillation by using 45° Faraday rotator mirror, meanwhile, in its another polarization maintaining ring cavity, the effect of SHB induced...
Traditional imaging radar system radiates the same periodic signals so that wavefronts of the radiation fields at different moments are exactly the same, then the targets within the beam cannot be distinguished. Based on a new concept of two-dimensional temporal-spatial stochastic radiation fields, a novel super-resolution staring imaging radar is proposed with its block diagram in this paper. The...
For the purpose of obtaining high-resolution staring image of ground targets by high-altitude imaging platforms, this paper proposes a super-resolution imaging approach based on random radiation radar array by combining random signal radiation and correlated imaging. Firstly, this super-resolution imaging principles are analyzed, and the definition of temporalspatial stochastic characteristics of...
The time-frequency(T-F) characteristics of the microwave-induced thermoacoustic signals generated from the tumors inside the breast are analyzed by Choi-Williams Distribution(CWD). The signals are simulated by finite-difference time-domain(FDTD) codes, with the semi-round breast model. The results indicate that round-shaped and ellipsoidal-shaped tumors with different sizes and shapes have different...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.