精度

Because of harsh environment that strapdown inertial guidanc e system works in, the conventional accelerator data acquisition systems such as I/F converter and A/D acq uisition have limitations in testing. Therefore, a new method which combing I/F and A/D based on PC104 bus was pro posed, and an ADAS module with the advantages of I/F and A/D schemes was designed.

加速度计是捷联惯导系统的核心部件，由于捷联惯导系统恶劣的工作环境，通常以I/F转换或A/D 采样方案设计的加速度计数据采集系统在测试中均有局限性，因此基于PC104总线提出I /F和A/D相结合的方法，设计了高精度加速度计数据采集系统，该系统同时具有I/F和A/D方案的优点。

A standard configuration interface SPI is added in the configuration circuit, and a group of highly sensitive amplifiers is used to magnify the read back data.

编程下载电路中加入了标准配置接口SPI，同时设计了高精度的回读放大器，能够更可靠的实现配置数据的回读。

In addition, the transformation formulas among many classes of baseline position parameter solution is deduced, and the relation formulas among precisions of many classes of baseline position parameter solution is also deduced in this section.

另外，还推导出了各类基线位置参数解之间的换算关系公式，以及各类基线位置参数解精度之间的关系公式。

In Chapter 4 windowed function of data signal processing is introduced and applied to addition theorem, which succeeds in solving the difficult problem: it has a bad result when recursive T-matrix is applied to calculate the wave scattering of electrically large objects and multiple objects in the excitation of TE wave.

在第四章中引入数字信号处理中的窗函数，成功解决了在入射波为TE波时，用递推T矩阵法计算电大尺寸物体或多个散射体时，精度不高的问题。

The paper presents methods of automatic checking adjustment of additional systematic error parameter in adjustment computations in side direction net.

提出了用于边角网平差计算的附加系统误差参数自检校平差方法，分析了边角网的可靠性和精度。

Therefore, how to increase the air permeability and smoothness of the filter material, and to reduce the dust adhesiveness and running resistance, has become a research subject.

因此，在保证滤料达到较高的过滤精度情况下，如何提高滤料的透气度及提高表面光洁程度，减少粉尘附着，降低运行阻力是滤料生产厂首先应研究的课题。

In order to raise a level of the application researches on the back-analysis from displacements,an influence of the loosing zone caused by excavating an adit upon the resultsof back-analysis and how to raise unceasingly its precision,etc.

为了进一步提高位移反分析应用研究的水平，需要认真考虑试验洞开挖引起的松动圈对反演结果的影响和如何不断地提高位移反分析的精度等问题。

The characteristic approximation is used to handle the convection part along the direc-tion of fluid namely characteristic direction to ensure the high stability of the method in approximating the sharp fronts and reduce the numerical diffusion; The mixed finite element spatial approximation is employed to deal with diffusion part and approximate the scalar unknown and the adjoint vector function optimally and simultaneously; In order to preserve the integral conservation of the method, we introduce the modified characteristic method.

该方法对方程的对流部分沿流体流动的方向即特征方向离散以保证格式在流动的锋线前沿逼近的高稳定性，消除数值弥散现象；对方程的扩散部分采用最低次混合有限元方法离散、同时以高精度逼近未知函数及未知函数的梯度；为保证方法的整体守恒性，在格式中引入修正项。

A novel direction of arrival and polarization estimation of electromagnetic vector sensors mounted on the airframe is proposed based on biquaternion. The signal processing model for EM-sensor mounted on the airframe is made by biquaternion and then the eigenvalue decomposition of spectral matrix is obtained by means of the EVD of its quaternion adjoint matrix. The memory requirement for data is reduced, and more accurate estimation result is gotten by deducing the stronger orthogonality constraint between the sin- gal and noise subspaces on the field of biquaternion. The performance of the new algorithm is confirmed through numerical examples.

针对机载电磁矢量传感器阵列DOA和极化参数估计问题，提出了一种基于复四元数估计方法，该算法利用四元数建立机载电磁矢量传感器阵列信号处理模型，然后利用四元数联合矩阵的特征分解得到阵列数据相关矩阵的特征分解，一方面使得计算过程中数据的贮存量大大减少，另一方面通过推导得到信号子空间和噪声子空间在四元数域上的正交性从而使DOA和极化参数佑计的精度更高，仿真证实了本算法的有效性。

In this paper, the adjoint system theory is applied to the guidance accuracy assess ment of the flying vehicle, and the covariance matrix of the impact point deviat ion is solved.

本文根据伴随系统理论，在某飞行器制导工具误差的精度评定中加以实际应用，求出落点偏差的协方差矩阵。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。