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Diffstat (limited to 'inst/enu2aer.m')
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diff --git a/inst/enu2aer.m b/inst/enu2aer.m new file mode 100644 index 0000000..f47db5f --- /dev/null +++ b/inst/enu2aer.m @@ -0,0 +1,120 @@ +## Copyright (c) 2014-2020 Michael Hirsch, Ph.D. +## Copyright (c) 2013-2020, Felipe Geremia Nievinski +## Copyright (C) 2019-2020 Philip Nienhuis +## +## Redistribution and use in source and binary forms, with or without +## modification, are permitted provided that the following conditions are met: +## 1. Redistributions of source code must retain the above copyright notice, +## this list of conditions and the following disclaimer. +## 2. Redistributions in binary form must reproduce the above copyright notice, +## this list of conditions and the following disclaimer in the documentation +## and/or other materials provided with the distribution. +## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +## AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +## THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +## ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE +## LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +## CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +## SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; +## OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, +## WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +## SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +## -*- texinfo -*- +## @deftypefn {Function File} {@var{az}, @var{el}, @var{slantrange} =} enu2aer (@var{east}, @var{n}, @var{up}) +## @deftypefnx {Function File} {@var{az}, @var{el}, @var{slantrange} =} enu2aer (@dots{...}, @var{angleUnit}) +## Converts ENU coordinates to azimuth, elevation, slantrange +## +## Inputs: +## @itemize +## @item +## @var{east}, @var{n}, @var{up}: East, North, Up coordinates of test points (meters) +## +## @item +## (Optional) angleUnit: string for angular units ('radians' or 'degrees', +## case-insensitive, only first character is significant). +## Default is 'd': degrees +## @end itemize +## +## Outputs: +## @itemize +## @item +## @var{az}, @var{el}, @var{slantrange}: look angles and distance to point +## under test (degrees, degrees, meters) +## @end itemize +## +## Example: +## @example +## [az, el, slantrange] = enu2aer (186.28, 286.84, 939.69) +## az = 33.001 +## el = 70.000 +## slantrange = 1000.00 +## @end example +## +## With radians +## @example +## [az, el, slantrange] = enu2aer (353.55, 353.55, 866.03,"r") +## az = 0.78540 +## el = 1.0472 +## slantrange = 1000.0 +## @end example +## +## @end deftypefn + +## Function adapted by anonymous contributor, see: +## https://savannah.gnu.org/patch/index.php?8377 + +function [az, el, slantrange] = enu2aer (east, n, up, angleUnit = "degrees") + + if (nargin < 3 || nargin > 4) + print_usage(); + endif + + if (! isnumeric (east) || ! isreal (east) || ... + ! isnumeric (n) || ! isreal (n) || ... + ! isnumeric (up) || ! isreal (up)) + error ("enu2aer.m : numeric values expected"); + endif + + if (! all (size (east) == size (n)) || ! all (size (n) == size (up))) + error ("enu2aer.m: non-matching dimensions of inputs."); + endif + + if (! ischar (angleUnit)) + error ("enu2ear.m: character value expected for 'angleUnit'"); + elseif (! strncmpi (angleUnit, "degrees", length (angleUnit)) && + ! strncmpi (angleUnit, "radians", length (angleUnit))) + error ("enu2aer.m: illegal input for 'angleUnit'"); + endif + + r = hypot (east, n); + slantrange = hypot (r, up); + ## Radians + el = atan2 (up, r); + az = mod (atan2 (east, n), 2 * atan2 (0, -1)); + + if (nargin == 3) + az = rad2deg (az); + el = rad2deg (el); + endif + +endfunction + + +%!test +%! [az, el, slantrange] = enu2aer (186.277521, 286.84222, 939.69262); +%! assert ([az, el, slantrange], [33, 70, 1e3], 10e-6) +%! [az, el, slantrange] = enu2aer (186.277521, 286.84222, 939.69262, "rad"); +%! assert ([az, el, slantrange], [0.57595865, 1.221730476, 1e3], 10e-6) + +%!error <numeric> enu2aer ("s", 25, 1e3) +%!error <numeric> enu2aer (3i, 25, 1e3) +%!error <numeric> enu2aer (33, "s", 1e3) +%!error <numeric> enu2aer (33, 3i, 1e3) +%!error <numeric> enu2aer (33, 25, "s") +%!error <numeric> enu2aer (33, 25, 3i) +%!error <non-matching> enu2aer ([1 1], [2 2]', [4 5]) +%!error <non-matching> enu2aer ([1 1], [2 2], [4 5 6]) +%!error <illegal> enu2aer (33, 70, 1e3, "f"); +%!error <illegal> enu2aer (33, 70, 1e3, "radianf"); |