Well, the first observation is that the velocity vector what can I say about the velocity vector of this motion?
首先，第一个观察到的就是速度向量,关于这个运动中的速度向量，我可以说点什么呢？
The speed is not changing, but the velocity vector is changing.
速率保持不变，但速度矢量会发生变化。
And, that's the plane that contains the origin, the point, and the velocity vector.
并且这个平面包含了原点和动点，以及速度矢量。
So, the definition will take effect. The acceleration is as a vector, and the acceleration vector is just the derivative of a velocity vector.
有必要对加速度给出一个严格的定义，加速度,作为一个矢量,是速度的一阶导数。
With ADS-B, velocity changes are broadcast almost instantaneously as part of the State Vector report.
使用ADS - B技术速度变化传播信号作为状态向量报告一部分，几乎是一瞬间就能探测到。
So, if you just look at the position vector, and the velocity vector for any motion at any given time, then together, they determine some plane.
如果你看一下任何时刻运动时的，位置矢量和速度矢量，它们决定了某个平面。
This acceleration that is necessary to make the change in the velocity vector is always pointing towards the center of the circle.
要促使速度矢量，产生如此的变化，所需的加速度，总是指向圆心。
And, the way we can get it, so, it's called usually V, so, V here stands for velocity more than for vector. And, you just get it by taking the derivative of a position vector with respect to time.
根据它的原理，我们通常用v表示,这里的V更代表速率而不是矢量，你能通过,对一个关于时间的位置向量求导得到它。
OK, so that's the velocity vector.
好，这就是速度矢量。
OK, that's what we call the velocity vector.
就是我们所说的速度矢量。
And so, that's called the velocity vector.
因此我们叫它速度矢量。
Executive priorities establish your strategic velocity vector.
执行优先级建立了您的策略速度向量。
So, the velocity vector is the derivative of a position vector with respect to time.
速度向量，是位置向量关于时间的导数。
So, maybe if I actually stated directly that way, see, I'm just saying the velocity vector has a length and a direction.
也许我们可以这样理解，看，我说过速度矢量有模长和方向。
So, the velocity vector is going to be always tangent to the curve.
速度向量总是与曲线相切的。
So, even if the speed is constant, that means, even if a length of the velocity vector stays the same, the velocity vector can still rotate.
因此即使速率不变，也就是说速度矢量的的大小不变，但它的方向可以做旋转。
Velocity is a vector and acceleration is a vector and today we're going to learn how to work with these vectors.
速度是个矢量，加速度也是个矢量，今天要来学学，如何处理矢量。
Speed is the magnitude of the velocity vector and the speed, therefore, always has a positive value.
速率是速度矢量的大小,因此速率一般，都是正值。
Well, at point P, the velocity vector QP is perpendicular to the line QP, 1 so the sine of that angle is one.
点P，速度向量,垂直于直线，所以该角的正弦值为。
r So, let's remember that the amount by which we moved, t delta r, is approximately equal to v times delta t, OK, and just using the definition of a velocity vector.
所以记住移动的量△,约等于v*△,这是用速度矢量的定义。
You could say the position vector at another time, or at any time, but in fact, what's also true is that the velocity vector is in the plane.
你可以说，位置矢量在另一个时间或在任何时间，无论如何，位置矢量始终在这个平面上。
Well, in physics, momentum is a vector, and it is a product between the mass of a particle and its velocity.
物理中，动量是矢量，它产生于,由粒子的质量与速度。
So, I'm going to draw it in red. OK, so that's a unit vector that goes along the curve, and then the actual velocity is going to be proportional to that.
现在画成红色，这就是，沿曲线的单位速度向量，实际中的速度向量与它成比例的。
And the other side is going to be given by my velocity vector F.
另一边将由速度向量f给出。
The method of obtaining it by using the velocity vector and location information is put forward, which is compared with the method of track extrapolation.
提出了利用速度向量及位置信息求取照射角的方法，并与航迹外延法求照射角作比较，提出了基于照射角的雷达调度策略。
The velocity vector is introduced into the model describing target motion, which depicts the target moving more precisely.
将速度矢量引入到目标运动模型，从而能更好地描述机动目标。
By using backward difference of space-time intensity correlation function with respect to time delay, the two-dimensional velocity vector of a moving diffuser can be measured.
利用远场时变散斑空-时强度相关函致的有限差商可以测量散射体运动的二维速度矢量。
For the case of planar interception, the so called relative heading error angle between the relative velocity vector and the LoS (Line of Sight) is chosen as the output to be controlled to zero.
针对平面拦截问题，选择导弹和目标之间的相对速度矢量与导弹-目标视线之间的夹角（称为相对航向误差角）作为将要被控制到零的输出。
For the case of planar interception, the so called relative heading error angle between the relative velocity vector and the LoS (Line of Sight) is chosen as the output to be controlled to zero.
针对平面拦截问题，选择导弹和目标之间的相对速度矢量与导弹-目标视线之间的夹角（称为相对航向误差角）作为将要被控制到零的输出。
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