319 lines
9.0 KiB
C++
319 lines
9.0 KiB
C++
#pragma once
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/*********************************
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* MOUNT CONTROL COMPONENTS *
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* *
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* astrometry functions *
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*********************************/
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#include <chrono>
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#include <unordered_map>
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#include <xsimd/xsimd.hpp>
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#include "utils.h"
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namespace mcc::traits
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{
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template <typename T>
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concept mcc_scalar_or_simd_c = xsimd::is_batch<T>::value || std::is_arithmetic_v<T>;
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template <typename T>
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concept mcc_real_or_char_range =
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std::floating_point<T> ||
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(std::ranges::contiguous_range<T> && std::same_as<char, std::remove_cvref_t<std::ranges::range_value_t<T>>>);
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} // namespace mcc::traits
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namespace mcc::astro
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{
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// modified Julian date (based on ERFA eraCal2jd)
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// template <traits::mcc_scalar_or_simd_c T>
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static int mcc_julday(const std::chrono::system_clock::time_point& start_time,
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const std::chrono::system_clock::duration& step,
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std::vector<double, xsimd::default_allocator<double>>& mjd)
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{
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if (mjd.empty()) {
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return -100;
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}
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using namespace std::literals::chrono_literals;
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auto dd = std::chrono::floor<std::chrono::days>(start_time);
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std::chrono::year_month_day ymd{dd};
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static constexpr std::chrono::year MIN_YEAR = -4799y;
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if (ymd.year() < MIN_YEAR) {
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return -1;
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}
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if (!ymd.month().ok()) {
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return -2;
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}
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// my = (im - 14) / 12;
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// iypmy = (long) (iy + my);
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int64_t my = -(14 - (unsigned)ymd.month()) / 12;
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int64_t iypmy = (int)ymd.year() + my;
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// (1461L * (iypmy + 4800L)) / 4L
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// + (367L * (long) (im - 2 - 12 * my)) / 12L
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// - (3L * ((iypmy + 4900L) / 100L)) / 4L
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// + (long) id - 2432076L
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// integer part of result MJD
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int64_t mjd_int = 1461LL * (iypmy + 480LL) / 4LL +
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(367LL * ((int64_t)(unsigned)ymd.month() - 2LL - 12LL * my)) / 12LL -
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(3LL * (iypmy + 4900LL) / 100LL) / 4LL + (int64_t)(unsigned)ymd.day() - 2432076LL;
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constexpr double nanosec = 1.0 / 24.0 / 3600.0 / 1.0E-9; // 1 nanosecond in days
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double mjd_float = static_cast<double>(mjd_int) +
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std::chrono::duration_cast<std::chrono::nanoseconds>(start_time - dd).count() * nanosec;
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double d_step = std::chrono::duration_cast<std::chrono::nanoseconds>(step).count() * nanosec;
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constexpr size_t reg_size = xsimd::batch<double>::size;
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size_t vec_size = mjd.size() - mjd.size() % reg_size;
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xsimd::batch<double> res_reg{mjd_float};
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xsimd::batch<double> step_reg = [d_step]<size_t... Is>(std::index_sequence<Is...>) {
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return xsimd::batch<double>{(Is * d_step)...};
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}(std::make_index_sequence<reg_size>{});
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// vectorized part
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size_t i = 0;
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for (; i < vec_size; i += vec_size) {
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res_reg += step_reg;
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res_reg.store_aligned(mjd.data() + i);
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}
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// scalar part
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for (size_t j = i; j < mjd.size(); ++j) {
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mjd[j] = mjd_float + j * d_step;
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}
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return 0;
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}
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/*
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* angles are in degrees or sexagimal string form
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*/
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template <traits::mcc_real_or_char_range AT,
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traits::mcc_real_or_char_range RT,
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traits::mcc_real_or_char_range DT,
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traits::mcc_real_or_char_range LT>
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double mcc_time_to_alt_limit(const AT& alt_limit,
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const RT& RA,
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const DT& DEC,
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const LT& LAT,
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const std::chrono::system_clock::time_point& now)
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{
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// sin(alt) = sin(DEC)*sin(phi) + cos(DEC)*cos(phi)*cos(HA)
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// HA = LST - RA
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double ra, dec, lat, alt;
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if constexpr (std::floating_point<AT>) {
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alt = alt_limit * utils::deg2radCoeff;
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} else {
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alt = utils::parsAngleString(alt_limit);
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alt *= utils::deg2radCoeff;
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}
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if constexpr (std::floating_point<RT>) {
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ra = RA * utils::deg2radCoeff;
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} else {
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ra = utils::parsAngleString(RA, true);
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ra *= utils::deg2radCoeff;
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}
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if constexpr (std::floating_point<DT>) {
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dec = DEC * utils::deg2radCoeff;
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} else {
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dec = utils::parsAngleString(DEC);
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dec *= utils::deg2radCoeff;
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}
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if constexpr (std::floating_point<LT>) {
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lat = LAT * utils::deg2radCoeff;
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} else {
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lat = utils::parsAngleString(LAT);
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lat *= utils::deg2radCoeff;
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}
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double cos_ha = (std::sin(alt) - std::sin(dec) * std::sin(lat)) / std::cos(dec) / std::cos(lat);
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if (std::abs(cos_ha) > 1.0) { // circumpolar (it never sets below horizon)
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return std::numeric_limits<double>::infinity();
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}
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double lst = std::acos(cos_ha) + ra;
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return 0.0;
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}
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/* IERS bulletins
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*
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* BULLETIN A: https://datacenter.iers.org/data/latestVersion/bulletinA.txt
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* leapseconds: https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat
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*
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*/
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struct leapsecond_db_elem_t {
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double mjd;
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unsigned day, month;
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int year;
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double tai_utc; // TAI-UTC in seconds
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};
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typedef std::vector<leapsecond_db_elem_t> leapsecond_db_t;
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struct earth_orient_db_elem_t {
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int year;
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unsigned month, day;
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double mjd;
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double x, y; // Polar coordinates in arcsecs
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double dut1; // UT1-UTC in seconds
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};
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typedef std::vector<earth_orient_db_elem_t> earth_orient_db_t;
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// init to some known state
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static leapsecond_db_t CURRENT_LEAPSECONDS_DB = {
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{41317.0, 1, 1, 1972, 10}, {41499.0, 1, 7, 1972, 11}, {41683.0, 1, 1, 1973, 12},
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{42048.0, 1, 1, 1974, 13}, {42413.0, 1, 1, 1975, 14}, {42778.0, 1, 1, 1976, 15},
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{43144.0, 1, 1, 1977, 16}, {43509.0, 1, 1, 1978, 17}, {43874.0, 1, 1, 1979, 18},
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{44239.0, 1, 1, 1980, 19}, {44786.0, 1, 7, 1981, 20}, {45151.0, 1, 7, 1982, 21},
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{45516.0, 1, 7, 1983, 22}, {46247.0, 1, 7, 1985, 23}, {47161.0, 1, 1, 1988, 24},
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{47892.0, 1, 1, 1990, 25}, {48257.0, 1, 1, 1991, 26}, {48804.0, 1, 7, 1992, 27},
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{49169.0, 1, 7, 1993, 28}, {49534.0, 1, 7, 1994, 29}, {50083.0, 1, 1, 1996, 30},
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{50630.0, 1, 7, 1997, 31}, {51179.0, 1, 1, 1999, 32}, {53736.0, 1, 1, 2006, 33},
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{54832.0, 1, 1, 2009, 34}, {56109.0, 1, 7, 2012, 35}, {57204.0, 1, 7, 2015, 36},
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{57754.0, 1, 1, 2017, 37}
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};
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bool mcc_parse_bulletinA(std::derived_from<std::basic_istream<char>> auto& stream, char comment_sym = '*')
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{
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for (std::string line; std::getline(stream, line);) {
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if (line.empty()) {
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continue;
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}
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auto sv = utils::trimSpaces(line, utils::TrimType::TRIM_BOTH);
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if (sv.size()) {
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if (sv[0] == comment_sym) { // comment string
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continue;
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}
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} else {
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continue;
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}
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}
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return true;
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}
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bool mcc_parse_leapsecs(std::derived_from<std::basic_istream<char>> auto& stream, char comment_sym = '#')
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{
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size_t n;
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std::optional<double> vd;
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std::optional<unsigned> vui;
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std::optional<int> vi;
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leapsecond_db_t db;
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leapsecond_db_elem_t db_elem;
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for (std::string line; std::getline(stream, line);) {
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if (line.empty()) {
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continue;
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}
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auto sv = utils::trimSpaces(line, utils::TrimType::TRIM_BOTH);
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if (sv.size()) {
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if (sv[0] == comment_sym) { // comment string
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continue;
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}
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} else {
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continue;
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}
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n = 0;
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for (auto const& el : std::views::split(sv, std::string_view(" "))) {
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if (std::ranges::size(el) == 0) {
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continue;
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}
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switch (n) {
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case 0:
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vd = utils::numFromStr<double>(el);
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if (!vd) {
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return false;
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}
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db_elem.mjd = vd.value();
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break;
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case 1:
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vui = utils::numFromStr<unsigned>(el);
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if (!vui) {
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return false;
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}
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db_elem.day = vui.value();
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break;
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case 2:
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vui = utils::numFromStr<unsigned>(el);
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if (!vui) {
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return false;
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}
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db_elem.month = vui.value();
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break;
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case 3:
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vi = utils::numFromStr<int>(el);
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if (!vi) {
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return false;
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}
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db_elem.year = vi.value();
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break;
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case 4:
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vd = utils::numFromStr<double>(el);
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if (!vd) {
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return false;
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}
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db_elem.tai_utc = vd.value();
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break;
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default:
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// just ignore??!!!
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break;
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}
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++n;
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if (n == 5) {
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break;
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}
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}
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if (n < 5) { // not enough elements
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return false;
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}
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db.emplace_back(std::move(db_elem));
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}
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CURRENT_LEAPSECONDS_DB = std::move(db);
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return true;
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}
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} // namespace mcc::astro
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