bplane_module – fortran-astrodynamics-toolkit

B-plane and hyperbolic routines.

Uses

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Used by

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Graph Key

Nodes of different colours represent the following:

Solid arrows point from a submodule to the (sub)module which it is descended from. Dashed arrows point from a module or program unit to modules which it uses.

Functions

public pure function hyperbolic_turning_angle(e) result(delta)

Author: Jacob Williams
Date: 3/6/2016

Compute the hyperbolic turning angle from the eccentricity.

Arguments

Type	Intent	Optional	Attributes		Name
real(kind=wp),	intent(in)			::	e	eccentricity [--]

Return Value real(kind=wp)

turning angle [rad]

public pure function vinf_to_energy(vinfmag) result(energy)

Author: Jacob Williams
Date: 3/6/2016

Convert V-infinity magnitude to energy.

Arguments

Type	Intent	Optional	Attributes		Name
real(kind=wp),	intent(in)			::	vinfmag	$v^{\infty}$ vector magnitude [km/s]

Return Value real(kind=wp)

two-body orbital energy [km^2/s^2]

Subroutines

public subroutine bplane(mu, rv, vinfvec, bmag, theta, BdotT, BdotR, status_ok)

Compute B-plane parameters from position and velocity.

Arguments

Type	Intent	Attributes		Name
real(kind=wp),	intent(in)		::	mu	central body grav parameter $(km^3/s^2)$
real(kind=wp),	intent(in),	dimension(6)	::	rv	state vector (km,km/s)
real(kind=wp),	intent(out),	dimension(3)	::	vinfvec	incoming V-infinity vector (km/s)
real(kind=wp),	intent(out)		::	bmag	magnitude of B vector (km)
real(kind=wp),	intent(out)		::	theta	aim point orientation [rad]
real(kind=wp),	intent(out)		::	BdotT	$\mathbf{B} \cdot \mathbf{T}$ (km)
real(kind=wp),	intent(out)		::	BdotR	$\mathbf{B} \cdot \mathbf{R}$ (km)
logical,	intent(out)		::	status_ok	false if there were errors (non-hyperbolic or degenerate state)

public subroutine calculate_bplane_data(mu, state, bdotr, bdott, bmag, theta, istat)

Compute B-plane parameters from position and velocity -- alternate version.

Arguments

Type	Intent	Attributes		Name
real(kind=wp),	intent(in)		::	mu	central body grav parameter $(km^3/s^2)$
real(kind=wp),	intent(in),	dimension(6)	::	state	state vector (km,km/s)
real(kind=wp),	intent(out)		::	bdotr	$\mathbf{B} \cdot \mathbf{R}$ (km)
real(kind=wp),	intent(out)		::	bdott	$\mathbf{B} \cdot \mathbf{T}$ (km)
real(kind=wp),	intent(out)		::	bmag	magnitude of B vector (km)
real(kind=wp),	intent(out)		::	theta	aim point orientation [rad]
integer,	intent(out)		::	istat	status flag: Read more…

private subroutine compute_vinf_vectors(mu, rv, vinfin, vinfout)

Compute the incoming and/or outgoing v-infinity vectors, given the position and velocity of a hyperbola.

Arguments

Type	Intent	Optional	Attributes		Name
real(kind=wp),	intent(in)			::	mu	central body gravitational parameter
real(kind=wp),	intent(in),		dimension(6)	::	rv	position,velocity vector
real(kind=wp),	intent(out),	optional,	dimension(3)	::	vinfin	incoming v-infinity vector
real(kind=wp),	intent(out),	optional,	dimension(3)	::	vinfout	outgoing v-infinity vector

public subroutine bplane_test()

Unit test for bplane_module.

Arguments

None

bplane_module Module

Contents

Functions

Subroutines

Uses

Used by

Functions

public pure function hyperbolic_turning_angle(e) result(delta)

Arguments

Return Value real(kind=wp)

public pure function vinf_to_energy(vinfmag) result(energy)

Arguments

Return Value real(kind=wp)

Subroutines

public subroutine bplane(mu, rv, vinfvec, bmag, theta, BdotT, BdotR, status_ok)

Arguments

public subroutine calculate_bplane_data(mu, state, bdotr, bdott, bmag, theta, istat)

Arguments

private subroutine compute_vinf_vectors(mu, rv, vinfin, vinfout)

Arguments

public subroutine bplane_test()

Arguments