Delta-v_budget Delta-v_budget

Delta-v budget - Definition

Delta-v budget (or velocity change budget) is a term used in astrodynamics and aerospace industry for velocity change (or delta-v) requirements for the various propulsive tasks and orbital maneuvers over phases of the space mission.

Sample delta-v budget will enumerate various classes of manoeuvres, delta-v per manoeuvre, number of manoeuvres required over the time of the mission.

In the absence of an atmosphere and landings where the ground is hit with some speed, the delta-v is the same for changes in orbit the other way around: gaining and losing speed cost an equal effort.

Contents
1 Launch/landing budget
2 Stationkeeping budget
3 Interplanetary budget
4 See also
5 External link

Launch/landing budget

  • Launch to LEO — this not only requires an increase of velocity from 0 to 7.8 km/s, but also typically 1.5–2 km/s for atmospheric drag and gravity drag
  • Re-entry from LEO

Stationkeeping budget

Maneuver     Altitude     Average delta-v
per year 		    Maximum m/s
per year
[km] [m/s] [m/s]
station-keeping 50–55
Drag compensation 400–500 <25 <100
Drag compensation 500–600 <5 <25
Drag compensation >600 <7.5
Attitude control (3-axis) 2–6
Spin-up or despin 5–10
Stage booster separation 5–10
Momentum wheel unloading 2–6

Interplanetary budget

Maneuver             Delta-v        
required        
From:             To:             [m/s]        
Earth surface Low Earth Orbit 9700
Low Earth Orbit Geostationary Transfer Orbit 2500
Geostationary Transfer Orbit Geostationary Orbit 1500
Geostationary Transfer Orbit (perigee) Earth escape orbit   700
Low Lunar Orbit Lunar surface 1600
Earth escape orbit Low Lunar Orbit   700
Mars low-energy transfer orbit Earth escape orbit   600
Mars low-energy transfer orbit Mars capture orbit   900
Deimos transfer orbit Phobos transfer orbit   300
Mars Escape Orbit Deimos transfer orbit   200
Phobos transfer Orbit Low Mars Orbit   900
Mars surface Low Mars Orbit 4100
Deimos transfer orbit Deimos surface   700
Phobos transfer orbit Phobos surface   500

See also

External link


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