Motion errors are given first , and then theoretical analysis , simulation result show affections caused by 3 kinds of typical motion errors both on the doppler and the image . last the phase error criterions are given . 4 4 .研究了机载双站sar中偏航、俯仰和横滚三种姿态误差对回波多普勒频率和雷达成像的影响,并分析研究了天线指向误差对回波幅度的影响,最后通过仿真实验证明了研究的正确性。
The error criterion is derived from rotation vector concept directly . in the coning motion environment , a class of rotation vector optimal algorithms are derived and evaluated with the rule of making sure of the minimum coning error . 3 从旋转矢量的概念出发,推导了算法的精度准则,在典型的高动态环境? ?锥运动作为输入条件下,以使锥误差最小为原则,推导了旋转矢量各阶子样算法及其优化算法,并与传统的四元数算法进行了比较; 3
This algorithm adopts peak error or maximum amplitude error criterion to control the level of distortion in pipeline leak signals , and doesn ’ t change the subsequent location error of adaptive time - delay estimation in the case of a small quantization error , so as to implement the near - lossless compression of pipeline leak signals 该近无损压缩算法设计了基于峰值误差准则的量化方案对管道泄漏信号的失真度进行控制,在量化误差较小时并不影响后续自适应时延估计的定位误差,从而实现对管道泄漏信号的近似无损压缩。
In case of high input dimension system model , taking norm of input vector as the input of wavelet network instead of using tensor product method to construct wavelet network , which could solve the problems of high computation and curse of dimensionality . in the selecting of specific wavelet basis , this thesis first gets initial wavelet basis collection according to spectrum analysis , then gives the least squares regression algorithm to optimize wavelet basis collection based on the least estimation error criteria , which could also initialize the model parameters and increase the speed of convergence 对于具体的模型小波基函数选择,本文首先对样本数据进行时频域分析,根据小波基函数时频空间覆盖样本时频空间的原则,在小波框架中选择建模所用的函数集,然后根据估计误差最小准则,给出最小二乘回归优选算法以进一步优化小波基函数集。
One is combined with the maximum average error criterion and the mean square error criterion , and the other is combined with the absolute value average error criterion and the mean square error criterion . theory analysis shows that the two new search methods have less computational complexity than that of the non - optimal method 提出了两种替换原有均方误差最小准测的方法,分别是最大平均误差与均方误差最小准则相结合的搜索标准,以及绝对值平均误差与均方误差最小准则相结合的搜索标准。