simpeg.electromagnetics.natural_source.receivers.Tipper#

class simpeg.electromagnetics.natural_source.receivers.Tipper(locations_h, locations_base=None, orientation='xx', component='real', storeProjections=False)[source]#

Bases: BaseNaturalSourceRx

Receiver class for tipper data (3D problems only).

This class can be used to simulate AFMag tipper data, defined according to:

$$\begin{array}{r}\left[\begin{array}{cc}{T}_{zx}& T_{zy}\end{array}\right]={\left[\begin{array}{cc}{H}_x^{(x)}& H_y^{(x)}\\ H_x^{(y)}& H_y^{(y)}\end{array}\right]}^{-1}\left[\begin{array}{c}{H}_z^{(x)}\\ H_z^{(y)}\end{array}\right]\end{array}$$

where superscripts $(x)$ and $(y)$ denote signals corresponding to incident planewaves whose electric fields are polarized along the x and y-directions respectively. Note that in simpeg, natural source EM data are defined according to standard xyz coordinates; i.e. (x,y,z) is (Easting, Northing, Z +ve up).

The receiver class can also be used to simulate a diverse set of Tipper-like data types when horizontal magnetic fields are measured at a remote base station. These are defined according to:

$$\begin{array}{r}\left[\begin{array}{ccc}{T}_{xx}& T_{yx}& T_{zx}\\ T_{xy}& T_{yy}& T_{zy}\end{array}\right]={\left[\begin{array}{cc}{H}_x^{(x)}& H_y^{(x)}\\ H_x^{(y)}& H_y^{(y)}\end{array}\right]}_b^{-1}{\left[\begin{array}{ccc}{H}_x^{(x)}& H_y^{(x)}& H_z^{(x)}\\ H_x^{(y)}& H_y^{(y)}& H_z^{(y)}\end{array}\right]}_r\end{array}$$

where subscript $b$ denotes the base station location and subscript $r$ denotes the mobile receiver location.

Parameters:

locations_h(n_loc, n_dim) array_like

Locations where the roving magnetic fields are measured.

locations_base(n_loc, n_dim) array_like, optional

Locations where the base station magnetic fields are measured. Defaults to the same locations as the roving magnetic fields measurements, locations_r.

orientation{‘xx’, ‘yx’, ‘zx’, ‘zy’, ‘yy’, ‘zy’}

Specifies the tipper element $T_{ij}$ corresponding to the data.

component{‘real’, ‘imag’, ‘complex’}

Tipper data type. For the tipper element $T_{ij}$ specified by the orientation input argument, the receiver can be set to compute the following: - ‘real’: Real component of the tipper (unitless) - ‘imag’: Imaginary component of the tipper (unitless) - ‘complex’: The complex tipper is returned. Do not use for inversion!

storeProjectionsbool

Whether to cache to internal projection matrices.

Attributes

component	Tipper data type; i.e. "real", "imag".
locations	Locations of the two field measurements.
locations_base	Base station magnetic field measurement locations.
locations_h	Roving magnetic field measurement locations.
nD	Number of data associated with the receiver object.
orientation	Specifies the tipper element $T_{ij}$ corresponding to the data.
uid	Universal unique identifier

Methods

eval(src, mesh, f)	Not implemented for BaseRx
evalDeriv(src, mesh, f[, du_dm_v, v, adjoint])	Not implemented for BaseRx
getP(mesh, projected_grid[, location_id])	Get projection matrix from mesh to specified receiver locations.

Galleries and Tutorials using simpeg.electromagnetics.natural_source.receivers.Tipper#

MT: 3D: Forward

MT: 3D: Forward