368 lines
10 KiB
C++
368 lines
10 KiB
C++
/*
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* Copyright 2013 Daniel Warner <contact@danrw.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "Tle.h"
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#include <locale>
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namespace
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{
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static const unsigned int TLE1_COL_NORADNUM = 2;
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static const unsigned int TLE1_LEN_NORADNUM = 5;
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static const unsigned int TLE1_COL_INTLDESC_A = 9;
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static const unsigned int TLE1_LEN_INTLDESC_A = 2;
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static const unsigned int TLE1_COL_INTLDESC_B = 11;
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static const unsigned int TLE1_LEN_INTLDESC_B = 3;
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static const unsigned int TLE1_COL_INTLDESC_C = 14;
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static const unsigned int TLE1_LEN_INTLDESC_C = 3;
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static const unsigned int TLE1_COL_EPOCH_A = 18;
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static const unsigned int TLE1_LEN_EPOCH_A = 2;
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static const unsigned int TLE1_COL_EPOCH_B = 20;
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static const unsigned int TLE1_LEN_EPOCH_B = 12;
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static const unsigned int TLE1_COL_MEANMOTIONDT2 = 33;
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static const unsigned int TLE1_LEN_MEANMOTIONDT2 = 10;
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static const unsigned int TLE1_COL_MEANMOTIONDDT6 = 44;
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static const unsigned int TLE1_LEN_MEANMOTIONDDT6 = 8;
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static const unsigned int TLE1_COL_BSTAR = 53;
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static const unsigned int TLE1_LEN_BSTAR = 8;
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static const unsigned int TLE1_COL_EPHEMTYPE = 62;
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static const unsigned int TLE1_LEN_EPHEMTYPE = 1;
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static const unsigned int TLE1_COL_ELNUM = 64;
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static const unsigned int TLE1_LEN_ELNUM = 4;
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static const unsigned int TLE2_COL_NORADNUM = 2;
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static const unsigned int TLE2_LEN_NORADNUM = 5;
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static const unsigned int TLE2_COL_INCLINATION = 8;
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static const unsigned int TLE2_LEN_INCLINATION = 8;
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static const unsigned int TLE2_COL_RAASCENDNODE = 17;
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static const unsigned int TLE2_LEN_RAASCENDNODE = 8;
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static const unsigned int TLE2_COL_ECCENTRICITY = 26;
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static const unsigned int TLE2_LEN_ECCENTRICITY = 7;
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static const unsigned int TLE2_COL_ARGPERIGEE = 34;
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static const unsigned int TLE2_LEN_ARGPERIGEE = 8;
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static const unsigned int TLE2_COL_MEANANOMALY = 43;
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static const unsigned int TLE2_LEN_MEANANOMALY = 8;
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static const unsigned int TLE2_COL_MEANMOTION = 52;
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static const unsigned int TLE2_LEN_MEANMOTION = 11;
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static const unsigned int TLE2_COL_REVATEPOCH = 63;
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static const unsigned int TLE2_LEN_REVATEPOCH = 5;
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}
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/**
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* Initialise the tle object.
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* @exception TleException
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*/
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void Tle::Initialize()
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{
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if (!IsValidLineLength(line_one_))
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{
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throw TleException("Invalid length for line one");
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}
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if (!IsValidLineLength(line_two_))
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{
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throw TleException("Invalid length for line two");
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}
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if (line_one_[0] != '1')
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{
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throw TleException("Invalid line beginning for line one");
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}
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if (line_two_[0] != '2')
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{
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throw TleException("Invalid line beginning for line two");
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}
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unsigned int sat_number_1;
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unsigned int sat_number_2;
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ExtractInteger(line_one_.substr(TLE1_COL_NORADNUM,
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TLE1_LEN_NORADNUM), sat_number_1);
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ExtractInteger(line_two_.substr(TLE2_COL_NORADNUM,
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TLE2_LEN_NORADNUM), sat_number_2);
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if (sat_number_1 != sat_number_2)
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{
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throw TleException("Satellite numbers do not match");
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}
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norad_number_ = sat_number_1;
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if (name_.empty())
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{
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name_ = line_one_.substr(TLE1_COL_NORADNUM, TLE1_LEN_NORADNUM);
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}
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int_designator_ = line_one_.substr(TLE1_COL_INTLDESC_A,
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TLE1_LEN_INTLDESC_A + TLE1_LEN_INTLDESC_B + TLE1_LEN_INTLDESC_C);
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unsigned int year = 0;
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double day = 0.0;
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ExtractInteger(line_one_.substr(TLE1_COL_EPOCH_A,
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TLE1_LEN_EPOCH_A), year);
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ExtractDouble(line_one_.substr(TLE1_COL_EPOCH_B,
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TLE1_LEN_EPOCH_B), 4, day);
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ExtractDouble(line_one_.substr(TLE1_COL_MEANMOTIONDT2,
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TLE1_LEN_MEANMOTIONDT2), 2, mean_motion_dt2_);
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ExtractExponential(line_one_.substr(TLE1_COL_MEANMOTIONDDT6,
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TLE1_LEN_MEANMOTIONDDT6), mean_motion_ddt6_);
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ExtractExponential(line_one_.substr(TLE1_COL_BSTAR,
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TLE1_LEN_BSTAR), bstar_);
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/*
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* line 2
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*/
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ExtractDouble(line_two_.substr(TLE2_COL_INCLINATION,
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TLE2_LEN_INCLINATION), 4, inclination_);
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ExtractDouble(line_two_.substr(TLE2_COL_RAASCENDNODE,
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TLE2_LEN_RAASCENDNODE), 4, right_ascending_node_);
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ExtractDouble(line_two_.substr(TLE2_COL_ECCENTRICITY,
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TLE2_LEN_ECCENTRICITY), -1, eccentricity_);
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ExtractDouble(line_two_.substr(TLE2_COL_ARGPERIGEE,
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TLE2_LEN_ARGPERIGEE), 4, argument_perigee_);
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ExtractDouble(line_two_.substr(TLE2_COL_MEANANOMALY,
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TLE2_LEN_MEANANOMALY), 4, mean_anomaly_);
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ExtractDouble(line_two_.substr(TLE2_COL_MEANMOTION,
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TLE2_LEN_MEANMOTION), 3, mean_motion_);
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ExtractInteger(line_two_.substr(TLE2_COL_REVATEPOCH,
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TLE2_LEN_REVATEPOCH), orbit_number_);
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if (year < 57)
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year += 2000;
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else
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year += 1900;
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epoch_ = DateTime(year, day);
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}
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/**
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* Check
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* @param str The string to check
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* @returns Whether true of the string has a valid length
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*/
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bool Tle::IsValidLineLength(const std::string& str)
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{
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return str.length() == LineLength() ? true : false;
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}
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/**
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* Convert a string containing an integer
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* @param[in] str The string to convert
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* @param[out] val The result
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* @exception TleException on conversion error
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*/
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void Tle::ExtractInteger(const std::string& str, unsigned int& val)
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{
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bool found_digit = false;
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unsigned int temp = 0;
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for (std::string::const_iterator i = str.begin(); i != str.end(); ++i)
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{
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if (isdigit(*i))
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{
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found_digit = true;
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temp = (temp * 10) + (*i - '0');
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}
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else if (found_digit)
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{
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throw TleException("Unexpected non digit");
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}
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else if (*i != ' ')
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{
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throw TleException("Invalid character");
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}
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}
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if (!found_digit)
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{
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val = 0;
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}
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else
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{
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val = temp;
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}
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}
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/**
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* Convert a string containing an double
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* @param[in] str The string to convert
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* @param[in] point_pos The position of the decimal point. (-1 if none)
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* @param[out] val The result
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* @exception TleException on conversion error
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*/
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void Tle::ExtractDouble(const std::string& str, int point_pos, double& val)
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{
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std::string temp;
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bool found_digit = false;
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for (std::string::const_iterator i = str.begin(); i != str.end(); ++i)
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{
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/*
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* integer part
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*/
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if (i < str.begin() + point_pos - 1)
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{
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bool done = false;
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if (i == str.begin())
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{
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if(*i == '-' || *i == '+')
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{
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/*
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* first character could be signed
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*/
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temp += *i;
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done = true;
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}
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}
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if (!done)
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{
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if (isdigit(*i))
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{
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found_digit = true;
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temp += *i;
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}
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else if (found_digit)
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{
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throw TleException("Unexpected non digit");
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}
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else if (*i != ' ')
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{
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throw TleException("Invalid character");
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}
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}
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}
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/*
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* decimal point
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*/
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else if (i == str.begin() + point_pos - 1)
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{
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if (temp.length() == 0)
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{
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/*
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* integer part is blank, so add a '0'
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*/
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temp += '0';
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}
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if (*i == '.')
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{
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/*
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* decimal point found
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*/
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temp += *i;
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}
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else
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{
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throw TleException("Failed to find decimal point");
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}
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}
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/*
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* fraction part
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*/
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else
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{
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if (i == str.begin() && point_pos == -1)
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{
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/*
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* no decimal point expected, add 0. beginning
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*/
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temp += '0';
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temp += '.';
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}
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/*
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* should be a digit
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*/
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if (isdigit(*i))
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{
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temp += *i;
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}
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else
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{
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throw TleException("Invalid digit");
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}
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}
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}
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if (!Util::FromString<double>(temp, val))
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{
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throw TleException("Failed to convert value to double");
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}
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}
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/**
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* Convert a string containing an exponential
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* @param[in] str The string to convert
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* @param[out] val The result
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* @exception TleException on conversion error
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*/
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void Tle::ExtractExponential(const std::string& str, double& val)
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{
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std::string temp;
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for (std::string::const_iterator i = str.begin(); i != str.end(); ++i)
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{
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if (i == str.begin())
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{
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if (*i == '-' || *i == '+' || *i == ' ')
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{
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if (*i == '-')
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{
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temp += *i;
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}
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temp += '0';
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temp += '.';
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}
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else
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{
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throw TleException("Invalid sign");
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}
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}
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else if (i == str.begin() + str.length() - 2)
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{
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if (*i == '-' || *i == '+')
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{
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temp += 'e';
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temp += *i;
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}
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else
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{
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throw TleException("Invalid exponential sign");
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}
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}
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else
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{
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if (isdigit(*i))
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{
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temp += *i;
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}
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else
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{
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throw TleException("Invalid digit");
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}
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}
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}
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if (!Util::FromString<double>(temp, val))
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{
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throw TleException("Failed to convert value to double");
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}
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}
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