圆轨道

圆轨道锥束重建，因为算法上的简洁性以及工程实现的可行性，成为了锥束重建比较乐于采用的形式。

Circular orbit based Cone-Beam reconstruction algorithms , which are mathematically simpler and more feasible than other algorithms , are more favorable .

但是，这种算法不能满足线X射线源圆轨道锥束扫描的情况。

However , this algorithm does not apply for circular orbit cone-beam scan with line-focus X-ray source .

线源圆轨道锥束扫描三维CT重建算法

Reconstruction Algorithm for the Circular Orbit Cone-beam Scan 3D-CT with Line-focus Source

该文利用外推的思想提出了一种基于同心圆轨道的锥束CT重建算法。

This paper developed a cone beam reconstruction algorithm based on extrapolation .

基于同心圆轨道的锥形束CT重建算法

Cone beam reconstruction algorithm based on two concentric circles

基于Hilbert变换的CT圆轨道超短扫描重建算法

Super-short-scan algorithm for circular orbits based on Hilbert Transform

卫星圆轨道假设对GPS无线电掩星反演地球大气参数的影响

The effect of circular satellite orbit assumption on inverting earth 's atmospheric parameters by GPS Radio Occultation

圆轨道锥束重建中Radon空间数据缺失

Data incompleteness in Radon space for circular cone-beam reconstruction

利用非圆轨道电子束与TEM模电磁场互作用，测得了辐射强度和工作频率的电压调谐曲线，确定了腔体工作模式和电子运动的工作谐波。

The voltage tuning curves of the radiation strength and operating harmonics of electron motion were determined .

导航卫星一般采用近圆轨道，当卫星轨道偏心率或者轨道倾角接近于零时，利用GPS卫星开普勒轨道根数拟合卫星广播星历会出现一些问题。

When their orbit eccentricity or inclination are near zero , some problems may occur when the GPS Kepler orbit elements fitting method is applied to fit their broadcast ephemeris parameters .

基于MEO圆轨道的区域性星座设计

The Design of Regional Constellation Based on Medium Earth Orbit

基于星载SAR的基本理论，给出了一种进行星载SAR回波信号模拟的椭圆地球模型和椭圆轨道模型，它们优于传统的球地球模型和圆轨道模型。

Based on the Spaceborne SAR theory , an elliptical earth model and an elliptical orbit model are proposed , which have some advantages over the traditional circular ones .

在传统的星载SAR问题的研究中，地球采用球模型，轨道采用圆轨道模型，这给星载SAR问题的计算带来了一定的误差。

In the traditional solution to the SAR problems , the earth often adopts circular model and the orbit adopts elliptical model . This often brings error to the calculations .

利用这种算法，对圆轨道锥束大视场扫描3D-CT实验数据进行重建，获得了正确的图像。

Using the experimental data of circular orbit cone-beam large-field-of-view scan , the reconstruction algorithm creates the right images .

本文计算了粒子在CM场赤道平面的圆轨道半径，得出了电荷和磁矩会对粒子产生压力。

In this paper the orbital radius of the test particles in the equatorial plane of the CM field is calculated and the pressure exerted on the test particles by the charges and magnetic moment is also obtained .

通过对卫星地磁场和微分Riccati方程进行近似处理，给出有外界扰动和结构化摄动圆轨道卫星系统的H∞磁姿态控制规律。

Through the approximate handling of geomagnetic intensity and differential riccati equation , the magnetic attitude H control law of the microsatellite in a circle orbit which has external disturb and the structural perturbation is presented .

分析表明，其水平方向的有效扫描视野比基于FDK的圆轨道锥束扫描三维CT提高了80%以上。

Anlysis shows that the scan field of view along the horizon can be improved no less than 80 % compared with cone-beam 3D-CT based on FDK and circular orbit scan mode .

针对参考卫星运行于圆轨道的编队飞行，分析了J2项摄动的影响。

As to the formation flying with the reference satellite running on the circle orbit , the J 2 effect is analyzed .

基于FPD的圆轨道FDK型三维计算机层析成像技术（ComputedTomography，3D-CT）检测速度快，但成像质量不及2D-CT。

FDK-type three dimensional computed tomography ( 3D-CT ) with circular orbit based on FPD can execute inspection rapidly , but its imaging quality can not reach that of 2D-CT .

在地心引力场中，当目标航天器沿近圆轨道作无动力运动时，与目标航天器相邻的受控航天器相对于目标航天器的运动可以近似地用Hill方程描述。

When a objective spacecraft ( OS ) moves along near circular orbit in unpowered flight , the relative motion of controlled spacecraft ( CS ) relatively to the OS is described approximately by the Hill equations on condition that the CS is near to the OS .

为此，将上述点源FDK近似原理拓展到线源情况，推导了线源圆轨道锥束扫描3D-CT重建算法。

So the FDK approximation principle of the point-focus X-ray source is extended to line-focus X-ray sources . An algorithm for the reconstruction of circular orbit cone-beam scan to the line-focus X-ray source was deduced .

基于点X射线源圆轨道锥束扫描的FDK近似3D-CT重建算法重建速度快，在10°锥角内重建精度高，因此在工程上得到广泛应用。

FDK three-dimensional computed tomography ( 3D-CT ) reconstruction algorithm for the circular orbit cone-beam scan with the point-shaped X-ray source is more widely accepted when compared with other types . It has high reconstruction speed and accuracy within cone-beam angle of 10 ° .

基于C-W方程的相对动力学模型，用Lyapunov直接法设计了一种运行于近圆轨道航天器的近程导引控制律，给出了控制模型。

The control law for short distance guidance and space rendezvous of two spacecrafts flying in nearly circular orbit was put forward based on the relative motion of C-W equations in this paper , which adopted Lyapunov approach . The control model was given .

本文研究了在共面圆轨道HEO-LEO的过程中，气动辅助轨道转移飞行器（AOTV）在大气内飞行的极小时间控制问题。

This paper considers the minimum-time control of aeroassisted orbital transfer vehicle ( AOTV ) which arises in the study of coplanar HEO-LEO orbital transfer .

利用不同半径的同心圆轨道对物体重建两次，并根据平方反比关系，利用两次FDK算法重建结果的差异估计出真实值和重建值的差异，然后利用这个差异来修正重建结果。

The algorithm reconstructs the object through two concentric circles , first twice reconstructing the object with different orbit radii and then correcting one reconstruction result based on the relation between the reconstruction error and the orbit radius .

该算法应用于2个算例：①平面圆轨道的燃料最优转移，并将遗传算法和Hohmann转移的结果进行了比较；

This method was tested in two examples : one was the fuel optimal transfer between coplanar circular orbits , in which the computing result based on GA was compared with that of Hohmann transfer .

ICO全球通信系统是著名的全球个人移动通信系统（GMPCS）之一，它由空间段和地面段两部分组成；空间段由运行在中圆轨道上的12颗卫星组成；

ICO Global Communications System is one of the Global Mobile Personal Communications Systems , which consists of two parts : the space segment consists of 12 satellites operating on the intermediate circular orbits ;

从绝对运动与相对运动两方面推导了维持追踪航天器圆轨道运行的组合机动的运动规律，给出了V-bar接近段与逼近段的制导律。

The absolute and relative motions of the chaser in combined maneuvers were investigated when it maintains its initial circular orbit . Then the guidance rules of space rendezvous V-bar approach and final translation were derived respectively .

双点接触圆轨道在起重机上的应用

The application of round rail with twin points contact on cranes

研究了近圆轨道上两个飞行器轨道交会的控制问题。

The problem of control for two spacecrafts rendezvous is investigated .