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Performance gain bounds of coherently combining multiple radars in a target-based calibration manner

Journal of Systems Engineering and Electronics 2019年第2期30卷 278-287页

作者： LIU Xinghua XU Zhenhai XIAO Shunping State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System National University of Defense Technology

To achieve a high signal-to-noise ratio(SNR) while maintaining moderate radar antenna, a target-based calibration manner is available to coherently combine multiple radars. The key to this calibration manner is to estimate coherence parameters(CPs), i.e., time and phase calibration values in transmission and reception estimation, by separating the target returns into monostatic and bistatic echoes. However, CPs estimations exist uncertainties, which will affect the performance gain after multiradar coherent combination. The principle of coherently combining multiple radars is elaborated and the signal probability model for CPs estimation is established. On this basis, CPs Cramer-Rao bound(CRB) is derived in the closed-form, according to which the non-tight and tight upper bounds for multiple radars coherent combination performance gain are derived in the closed-form and via Monte Carlo(MC) simulations, respectively. Simulations validate the correctness of the derived CRB and gain bounds.

关键词： coherently combining multiple radars Cramer-Rao bound (CRB) coherence gain

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ON THE CAUCHY PROBLEM OF A coherently COUPLED SCHR?DINGER SYSTEM

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Acta Mathematica Scientia 2016年第2期36卷 371-384页

作者：王忠崔尚斌 Department of Mathematics Sun Yat-Sen University Guangzhou 510275 China

In this article, we consider the well-posedness of a coherently coupled Schrodinger system with four waves mixing in space dimension n ≤ 4. The Cauchy problem for the cubic system is studied in L^2 for n ≤ 2 and in ... 详细信息

关键词： Cauchy problem coherently Schrodinger system global existence

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Generation of few-cycle laser pulses by coherent synthesis based on a femtosecond Yb-doped fiber laser amplification system

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Chinese Optics Letters 2019年第4期17卷 66-70页

作者： Aichen Ge Bowen Liu Wei Chen Haochen Tian Youjian Song Lu Chai Mingiie Hu Ultrafast Laser Laboratory School of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronic Information Technology (Ministry of Education) Tianjin University

We demonstrate a coherent synthesis system based on femtosecond Yb-doped fiber laser technology. The output pulse of the amplification system is divided into two replicas and seeded into photonic crystal fibers of two parallel branches for nonlinear pulse compression. Because of the different nonlinear dynamics in the photonic crystal fibers, the compressed pulses show different spectra, which can be spliced to form a broad coherent spectrum. The integrated timing jitter between the pulses of two branches is less than one tenth of an optical *** coherently synthesizing pulses from these two branches, 8 fs few-cycle pulses are produced.

关键词： demonstrate a coherent femtosecond Yb-doped coherently synthesizing

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