poliastro.iod.vallado
¶
Initial orbit determination.
Module Contents¶
Functions¶
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Solves the Lambert problem. |
Attributes¶
- poliastro.iod.vallado.kms¶
- poliastro.iod.vallado.lambert(k, r0, r, tof, M=0, prograde=True, lowpath=True, numiter=35, rtol=1e-08)¶
Solves the Lambert problem.
New in version 0.3.0.
- Parameters
k (Quantity) – Gravitational constant of main attractor (km^3 / s^2).
r0 (Quantity) – Initial position (km).
r (Quantity) – Final position (km).
tof (Quantity) – Time of flight (s).
M (int, optional) – Number of full revolutions, default to 0.
prograde (boolean) – Controls the desired inclination of the transfer orbit.
lowpath (boolean) – If True or False, gets the transfer orbit whose vacant focus is below or above the chord line, respectively.
numiter (int, optional) – Maximum number of iterations, default to 35.
rtol (float, optional) – Relative tolerance of the algorithm, default to 1e-8.
- Returns
v0, v – Pair of velocity solutions.
- Return type
- Raises
RuntimeError – If it was not possible to compute the orbit.
Notes
This uses the universal variable approach found in Battin, Mueller & White with the bisection iteration suggested by Vallado. Multiple revolutions not supported.