一种SAR动目标联合参数估计与重定位方法

动目标参数估计和重定位算法的精度和效率直接影响SAR-GMTI系统的探测感知性能。针对上述问题,文章提出了一种动目标联合参数估计与重定位方法,针对运动目标SAR图像序列,在多普勒定位方程组的基础上,增补两个距离方程和一个调频率方程,构建关于动目标三坐标位置以及距离方位两维速度的5参数扩展非线性方程组,通过非线性方程组求解实现动目标运动参数和位置信息联合估计,在不降低精度的前提下提高了动目标参数估计与重定位效率。仿真验证了所提方法的有效性。

无线定位技术中基于多相位的预滤波算法研究

针对接收信号的前端预滤波处理的问题,文章提出了一种基于多相位滤波的预滤波算法,算法有效提高了接收信号噪声功率比,从而可以更精确地估算出定位计算中所需要的定位参数。理论分析表明,多相位滤波的前端预处理技术的采用可以明显提高无线定位精度。

Simultaneous Position Estimation and Omnidirectional Camera Parameter Calibration for Multiple Mobile Robots

This paper proposed an algorithm on simultaneous position estimation and calibration of omnidirectional camera parameters for a group of multiple mobile robots. It is aimed at developing of exploration and information gathering robotic system in unknown environment. Here, each mobile robot is not possible to know its own position. It can only estimate its own position by using the measurement value including white noise acquired by two omnidirectional cameras mounted on it. Each mobile robot is able to obtain the distance to those robots observed from the images of two omnidirectional cameras while making calibration during moving but not in advance. Simulation of three robots moving straightly shows the effectiveness of the proposed algorithm.