response_operators.py 1.47 KB
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# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Copyright(C) 2013-2018 Max-Planck-Society
#
# NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
# and financially supported by the Studienstiftung des deutschen Volkes.

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from ..field import exp
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def LinearizedSignalResponse(Instrument, nonlinearity, HarmonicTransform, power,
                             s, sunit):
    return sunit * (Instrument * nonlinearity.derivative(s) *
                    HarmonicTransform * power)
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def LinearizedPowerResponse(Instrument, nonlinearity, HarmonicTransform,
                            Projection, t, m, munit, sunit):
    power = exp(0.5 * t) * munit
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    position = HarmonicTransform(Projection.adjoint_times(power) * m)
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    linearization = nonlinearity.derivative(position)
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    return sunit * (0.5 * Instrument * linearization * HarmonicTransform * m *
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                    Projection.adjoint * power)