ID 原文 译文
20365 针对背压路由算法容易造成大量队列积压和收敛速度慢的缺陷，该文研究了无线多跳网络中节点功率受限情况下的联合拥塞控制、路由和功率分配的跨层优化问题。 In order to improve the performance of the large queue backlogs and low convergence rate in back pressure routing algorithm, the cross-layer optimization of joint congestion control, multi-path routing and power allocation in wireless multi-hop networks is investigated.
20366 以最大化网络效用为目标，以流平衡条件、功率等为约束条件建模，基于牛顿法提出了一种具有超线性收敛性能的算法，并运用矩阵分裂技术使该算法能够分布式实施。 The system is modeled as a network utility maximization problem under the constraints of flow balancing condition and power. Based on the Newton’smethod, the problem is solved and an algorithm with superlinear convergence speed is proposed. With matrix splitting technology, the algorithm can be implemented distributedly further.
20367 仿真结果表明，该算法在实现网络效用最大化的同时，能够有效提高网络中的能量效用，且能将网络中的队列长度稳定在一个较低水平，降低包传输延时。 The simulation results show thatthe algorithm can effectively increase the energy utility while achieving the maximum network utility, and cankeep the queue length at a very low level to decrease the packet transmission delay.
20368 由于运动误差严重的2维空变性，对于10 GHz超宽带微波光子SAR，传统的直接从相位进行运动误差估计的方法估计精度不高。 Due to the 2-D vacancies with serious motion errors when processing 10 GHz ultra-wideband microwave photonic-based SAR, current motion error estimation methods directly estimating with phase error can not obtain correct estimation result in this paper.
20369 因此，该文提出一种包络与相位联合的超高分辨运动误差估计方法，能够在没有惯导信息时实现运动误差的精确估计。 An ultra-high resolution SAR motion error estimation method jointing envelope and phase is proposed, which can realize accurate estimation of motion error without inertial information.
20370 该方法首先在距离徙动矫正(RCMC)之前，通过对包络对齐算法(RAA)提取的包络信息采用最小二乘算法(LSA)与梯度下降算法(GDA)获得近似的3维运动误差。 Firstly, the approximate 3-D motion error is obtained by applying the Least SquaresAlgorithm (LSA) and the Gradient Descent Algorithm (GDA) to the envelope information extracted by theRange Alignment Algorithm (RAA) before Range Curve Migration Correction (RCMC).
20371 接着，对粗补偿与RCMC之后的数据，先消除方位相位空变，然后采用两维空变的相位误差估计方法获得剩余运动误差的精确估计。 Then, phase-based motion error estimation is performed on the data after rough compensation and RCMC. After eliminating theazimuth variant phase error, the 2-D space-variant phase error estimation method is used to obtain accurate estimation of residual motion error.
20372 仿真和车载微波光子雷达实测数据验证了该方法的有效性。 Processing of simulated data and real data acquired from vehicle-borne microwave photonic-based radar validates the effectiveness of the proposed method.
20373 目标定位精度是机载合成孔径雷达(SAR)系统的一项重要技术指标，因此机载SAR图像目标定位具有重要的应用价值。 The target location accuracy is an important technical parameter of airborne SAR system, thus thetarget location of airborne SAR image is important for application.
20374 在基于距离-多普勒模型的SAR图像目标定位方法中，载机运动参数的精度会直接影响定位的精度，在机载平台导航精度受限的情况下，定位精度会受到很大影响。 The precision of the moving parameters directly influences the precision of the SAR image target location algorithm based on the Range-Doppler (RD)model. The locating accuracy is greatly affected if the navigation accuracy of the airborne platform is limited.