误差估计

Investigation indicates that the error of frequency estimation is proportional to the sampling rate, while that of initial phase independent of it.

研究表明频率估计的误差在采样点数确定时正比于采样率，而初相估计的误差则不受采样率的影响。

In this paper, firstly, the new combined error model of cumulative geoid height influenced by three error sources including the inter-satellite range-rate of K-band ranging system, orbital position of GPS receiver and non-conservative force of accelerometer from GRACE satellites is established using the semi-analytical method. Secondly, the dependability of error models is demonstrated based on matching relationship among the accuracy indexes of key payloads. Finally, the accuracy of global gravitational field up to degree and order 120 is effectively and rapidly estimated from GRACE Level 1B measured observation errors of the year 2006 publicized by the Jet Propulsion Laboratory in the USA, and the cumulative geoid height error is 18.368 cm at degree 120, which preferably accords with the Earth's gravitational field model EIGEN-GRACE02S provided by the GeoForschungsZentrum Potsdam in Germany.

首先基于半解析法建立了新的GRACE卫星K波段测量系统星间测速、GPS接收机轨道位置和加速度计非保守力误差联合影响累计大地水准面的误差模型；其次，基于各关键载荷精度指标的匹配关系，论证了误差模型的可靠性；最后，基于美国喷气动力实验室公布的2006年的GRACE Level 1B实测误差数据，有效和快速地估计了120阶全球重力场的精度，在120阶处累计大地水准面的精度为18.368 cm，其结果和德国地学研究中心公布的EIGEN-GRACE02S全球重力场模型符合较好。

Under the condition of point target background, the rotation parameter and precession parameter can be estimated effectively.

参数估计误差的理论分析表明，基于几何特征分析的运动估计不存在算法误差。

Its results show that in order to maintain desired BER performance the fixed estimalion error should be less than 0.07 dB, thd deviation of random estimation error should be less than 0.6, and the time-delay should be controlled within 0.001/v/λ(subscript c.

分析和仿真结果表明，为了维持系统所需的BER性能，固定估计误差值应小于0.07dB，随机估计误差的离差要低于0.6，而时间延迟应控制在0.001/v/λ

Some improvements for the mean square errors of the ratio estimator are presented.

改进了比率估计的均方误差，给出了偏差的价为 1/n3 的比率估计量均方误差及其估

The mean square errors and estimated mean square errors for the ratio estimator with bias of order 1/n 3are given.

改进了比率估计的均方误差，给出了偏差的价为 1/n3 的比率估计量均方误差及其估

The first approach was a qualitative test method, and gave statistical correlation trend. Second and third approaches were quantitative test methods, and indicated the goodness of fitting and the ranges of the residual estimation errors.

拟合相关图法属定性检验，给出了统计相关趋势；回归分析法和残差估计误差指示法为定量检验，给出了模拟计算值与实测值间的拟合优度和残差估计误差的范围。

In this paper,the truncated error of trapezium methodis analyzed under ideal state of electrical power parameters,a sin function,when sampling digital measurement and the relationship between the error and the amount of sampling points is offered.

对电力参数的理想情况采样数字化测量的典型算法的截断误差进行了分析，给出了误差与采样点数的关系；根据国家关于电能质量和公用电网谐波的标准规定，对非正弦状态下的误差也做出了符合实际的估计；在电网正常情况下截断误差与采样点数的关系与理想波形时相同。

The upper bound of its parame ter estimation error is analyzed, and the way to choose

投影辨识方法的参数估计误差上界，并给出了使估计误差上界最小的最佳数据窗

According to the recommended frame structure of IEEE802.16,the independent correlation of multiple preambles and the unique words in data sequence were adopted in the algorithm,and the initial timing offset was estimated.

该算法基于IEEE802.16推荐的帧结构，利用多个前导字的独立互相关特性和数据序列中插入的独特字，对定时误差进行初始估计，并用内插环路进行定时估计误差的跟踪，获得定时同步结果。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。