ImpulsiveBurn.BurnDirection Property

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Description

The components of the thrust vector in the coordinates of the attitude system specified by the chosen AttitudeSystem.

 

For each attitude system the maneuver components are defined as follows:

 

Coordinate System

Attitude System

X-Component

Y-Component

Z-Component

International Celestial Reference Frame (ICRF)

0

GCI X

GCI Y

GCI Z

Velocity-Normal-Binormal (VNB)

1

Velocity

Orbit Normal

Binormal (completes the right-handed system)

Local Vertical Local Horizontal (LVLH)

2

Co-Velocity

Negative Orbit Normal

Nadir

Spacecraft Body Fixed

3

Body coordinate X-directed component of maneuver

Body coordinate Y-directed component of maneuver

Body coordinate Z-directed component of maneuver

Geodetic

4

Geodetic X

Negative Orbit Normal

Normal to Earth's surface

UVW

5

U (Position)

V (Along Velocity Direction)

W (Orbit Normal)

RIC

6

R (Position)

I (Along Velocity Direction/"In-Track")

C (Orbit Normal/"Cross-Track")

 

In the above descriptions, the Orbit Normal is aligned with the angular momentum vector, the Negative Orbit Normal is aligned with the negative angular momentum vector, and Nadir points to the center of the Earth. The X-components of the VNB and LVLH coordinate systems, Velocity and Co-Velocity, differ by a rotation about the flight path angle. For more information on each of the coordinate systems above, see the Attitude Reference Frames page.

 

 

Timing Precision Mode

This page describes functionality in nanosecond timing precision mode.

Click here to see the documentation for this object in millisecond timing precision mode.

 

Attributes

Type:

Array of number (size = 3)

Access:

read/write

Units:

km/s

Default Value:

{ 1, 0, 0 }

 

Syntax

myVariable1 = myImpulsiveBurn1.BurnDirection[0];

 

myImpulsiveBurn1.BurnDirection[0] = myVariable1;

 

See also

ImpulsiveBurn Object

Impulsive Burns Guide