1 /* 2 * Copyright (c) 2016-2017, The University of Oxford 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 1. Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright notice, 10 * this list of conditions and the following disclaimer in the documentation 11 * and/or other materials provided with the distribution. 12 * 3. Neither the name of the University of Oxford nor the names of its 13 * contributors may be used to endorse or promote products derived from this 14 * software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef OSKAR_IMAGER_ROTATE_VIS_H_ 30 #define OSKAR_IMAGER_ROTATE_VIS_H_ 31 32 /** 33 * @file oskar_imager_rotate_vis.h 34 */ 35 36 #include <oskar_global.h> 37 #include <mem/oskar_mem.h> 38 #include <stddef.h> 39 40 #ifdef __cplusplus 41 extern "C" { 42 #endif 43 44 /** 45 * @brief 46 * Performs visibility amplitude phase rotation to a new phase centre. 47 * 48 * @details 49 * This function performs visibility amplitude phase rotation to a new phase 50 * centre. 51 * 52 * Prior to calling this function, the new phase centre must be set first 53 * using oskar_imager_set_direction(), and then the original phase centre 54 * must be set using oskar_imager_set_vis_phase_centre(). 55 * Note that the order of these function calls is important. 56 * 57 * Note that the coordinates (uu_in, vv_in, ww_in) correspond to the original 58 * phase centre, and must be in wavelengths. 59 * 60 * Reference: 61 * Cornwell, T.J., & Perley, R.A., 1992, 62 * "Radio-interferometric imaging of very large fields" 63 * 64 * @param[in] h Handle to imager. 65 * @param[in] num_vis Number of visibilities. 66 * @param[in] uu_in Original baseline UU coordinates, in wavelengths. 67 * @param[in] vv_in Original baseline VV coordinates, in wavelengths. 68 * @param[in] ww_in Original baseline WW coordinates, in wavelengths. 69 * @param[in,out] amps Complex visibility amplitudes. 70 */ 71 OSKAR_EXPORT 72 void oskar_imager_rotate_vis(oskar_Imager* h, size_t num_vis, 73 const oskar_Mem* uu_in, const oskar_Mem* vv_in, const oskar_Mem* ww_in, 74 oskar_Mem* amps); 75 76 #ifdef __cplusplus 77 } 78 #endif 79 80 #endif /* OSKAR_IMAGER_ROTATE_VIS_H_ */ 81