# Learn How to Calculate Missile Velocity Vector and Acceleration - Tutorial

## How to Calculate Missile Velocity Vector and Acceleration - Definition, Formula, Example

##### Definition :

Proportional navigation is a method of homing navigation used by most homing air target missiles. It depends on the fact that two vehicles are on a collision path when their missile turn rate is directly proportional to the turn rate in space of the line of sight.

##### Formula :
an = N x λ x V a-> = N x V x Ω Ω = V x R / R2
###### where,

an - Missile velocity vector N - is the PN constant λ - is the line of sight rate V - is the velocity. R - Rotate vector Ω - Line of sight a-> - Relative velocity

##### Example :

An antenna provides the line of sight rate at 28 meters with the Proportionality constant value (N) 20, velocity 20 and rotate vector 40.Calculate the missile velocity vector of the antenna, rotation vector and the relative velocity.

##### Given,

Proportionality constant value N = 20 Line of sight rate λ = 28 meters Velocity Vm = 20 Rotate vector R = 40

##### To Find,

Missile velocity vector an Rotation vector of the line of sight Ω Relative velocity a->

##### Solution :
###### Step 1:

Calculate the value of Missile velocity vector (an) an = N x λ x V = 20 x 28 x 20 = 11200

###### Step 2:

Calculate the value of Rotation vector of the line of sight Ω Ω= V x R / R2 = 20 x 40 / 402 = 800 / 402 = 0.5

###### Step 3:

Calculate the value of Relative velocity a-> a-> = N x V x Ω = 20 x 20 x 0.5 = 200

#### Related Calculator:

Learn how to calculate the Missile velocity vector and Acceleration in this tutorial, given with the definition, formula and example.