In this paper,we focus on the problem of joint estimation of DOA,power and polarization angle from sparse reconstruction perspective with array gain-phase errors,where a partly calibrated cocentered orthogonal loop an...In this paper,we focus on the problem of joint estimation of DOA,power and polarization angle from sparse reconstruction perspective with array gain-phase errors,where a partly calibrated cocentered orthogonal loop and dipole(COLD)array is utilized.In detailed implementations,we first combine the output of loop and dipole in second-order statistics domain to receive the source signals completely,and then we use continuous multiplication operator to achieve gain-phase errors calibration.After compensating the gain-phase errors,we construct a log-penalty-based optimization problem to approximate`0 norm and further exploit difference of convex(DC)functions decomposition to achieve DOA.With the aid of the estimated DOAs,the power and polarization angle estimation are obtained by the least squares(LS)method.By conducting numerical simulations,we show the effectiveness and superiorities of the proposed method.展开更多
We propose a method to generate the multi-mode entangled catalysis squeezed vacuum states(MECSVS)by embedding the cross-Kerr nonlinear medium into the Mach–Zehnder interferometer.This method realizes the exchange of ...We propose a method to generate the multi-mode entangled catalysis squeezed vacuum states(MECSVS)by embedding the cross-Kerr nonlinear medium into the Mach–Zehnder interferometer.This method realizes the exchange of quantum states between different modes based on Fredkin gate.In addition,we study the MECSVS as the probe state of multi-arm optical interferometer to realize multi-phase simultaneous estimation.The results show that the quantum Cramer–Rao bound(QCRB)of phase estimation can be improved by increasing the number of catalytic photons or decreasing the transmissivity of the optical beam splitter using for photon catalysis.In addition,we also show that even if there is photon loss,the QCRB of our photon catalysis scheme is lower than that of the ideal entangled squeezed vacuum states(ESVS),which shows that by performing the photon catalytic operation is more robust against photon loss than that without the catalytic operation.The results here can find applications in quantum metrology for multiparatmeter estimation.展开更多
极化敏感阵列可以获取到空间电磁信号的极化信息,具有优越的系统性能,可以更充分地利用信号中包含的信息。极化域-空域联合谱MU S IC算法是一种高性能的算法,但是在两信号参数相差不大,尤其是极化角度接近时无法分辨,在低信噪比、干扰...极化敏感阵列可以获取到空间电磁信号的极化信息,具有优越的系统性能,可以更充分地利用信号中包含的信息。极化域-空域联合谱MU S IC算法是一种高性能的算法,但是在两信号参数相差不大,尤其是极化角度接近时无法分辨,在低信噪比、干扰信号功率较大时算法性能明显下降,本文将波束空间预处理的方法应用该算法,阵列的抗干扰能力得到了提高,实验证明新算法的有效性。展开更多
首先,设计了节点自适应传感半径调整算法(AASR,adaptive adjustment of sensing radius),通过节点自适应选择最佳的覆盖范围,有效地进行节点覆盖控制,减少节点能量虚耗,提高覆盖效率。其次,从调整效果、能量消耗和覆盖冗余度3个方面对...首先,设计了节点自适应传感半径调整算法(AASR,adaptive adjustment of sensing radius),通过节点自适应选择最佳的覆盖范围,有效地进行节点覆盖控制,减少节点能量虚耗,提高覆盖效率。其次,从调整效果、能量消耗和覆盖冗余度3个方面对节点自适应传感半径调整算法进行了模拟实验和分析。仿真结果表明,AASR能够有效提高节点生存时间,减少能量消耗,提高覆盖率。展开更多
基金the National Natural Science Foundation of China under Grant 61171137.
文摘In this paper,we focus on the problem of joint estimation of DOA,power and polarization angle from sparse reconstruction perspective with array gain-phase errors,where a partly calibrated cocentered orthogonal loop and dipole(COLD)array is utilized.In detailed implementations,we first combine the output of loop and dipole in second-order statistics domain to receive the source signals completely,and then we use continuous multiplication operator to achieve gain-phase errors calibration.After compensating the gain-phase errors,we construct a log-penalty-based optimization problem to approximate`0 norm and further exploit difference of convex(DC)functions decomposition to achieve DOA.With the aid of the estimated DOAs,the power and polarization angle estimation are obtained by the least squares(LS)method.By conducting numerical simulations,we show the effectiveness and superiorities of the proposed method.
基金supported by the National Key R&D Program of China(Grant No.2021YFA1400800)the Key-Area Research and Development Program of Guangdong Province(Grant No.2018B030329001)+2 种基金the Natural Science Foundation of Guangdong(Grant No.2021A1515010039)the National Natural Science Foundation of China(No.11964013)the Major Discipline Academic and Technical Leaders Training Program of Jiangxi Province(No.20204BCJL22053).
文摘We propose a method to generate the multi-mode entangled catalysis squeezed vacuum states(MECSVS)by embedding the cross-Kerr nonlinear medium into the Mach–Zehnder interferometer.This method realizes the exchange of quantum states between different modes based on Fredkin gate.In addition,we study the MECSVS as the probe state of multi-arm optical interferometer to realize multi-phase simultaneous estimation.The results show that the quantum Cramer–Rao bound(QCRB)of phase estimation can be improved by increasing the number of catalytic photons or decreasing the transmissivity of the optical beam splitter using for photon catalysis.In addition,we also show that even if there is photon loss,the QCRB of our photon catalysis scheme is lower than that of the ideal entangled squeezed vacuum states(ESVS),which shows that by performing the photon catalytic operation is more robust against photon loss than that without the catalytic operation.The results here can find applications in quantum metrology for multiparatmeter estimation.
文摘极化敏感阵列可以获取到空间电磁信号的极化信息,具有优越的系统性能,可以更充分地利用信号中包含的信息。极化域-空域联合谱MU S IC算法是一种高性能的算法,但是在两信号参数相差不大,尤其是极化角度接近时无法分辨,在低信噪比、干扰信号功率较大时算法性能明显下降,本文将波束空间预处理的方法应用该算法,阵列的抗干扰能力得到了提高,实验证明新算法的有效性。
文摘首先,设计了节点自适应传感半径调整算法(AASR,adaptive adjustment of sensing radius),通过节点自适应选择最佳的覆盖范围,有效地进行节点覆盖控制,减少节点能量虚耗,提高覆盖效率。其次,从调整效果、能量消耗和覆盖冗余度3个方面对节点自适应传感半径调整算法进行了模拟实验和分析。仿真结果表明,AASR能够有效提高节点生存时间,减少能量消耗,提高覆盖率。
