99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
#include "altitude_calculator.hpp"
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#include <cmath>
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#include <iostream>
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#include <limits>
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// 物理常数
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constexpr float STANDARD_GRAVITY = 9.80665f; // 标准重力加速度 (m/s²)
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constexpr float MOLAR_MASS_AIR = 0.0289644f; // 空气摩尔质量 (kg/mol)
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constexpr float UNIVERSAL_GAS_CONSTANT = 8.3144598f; // 通用气体常数 (J/(mol·K))
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constexpr float STANDARD_TEMPERATURE = 288.15f; // 标准温度 (K) = 15°C
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constexpr float LAPSE_RATE = 0.0065f; // 温度递减率 (K/m)
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AltitudeCalculator::AltitudeCalculator(float sea_level_pressure)
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: sea_level_pressure_(sea_level_pressure) {
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// 验证输入参数
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if (!isValidPressure(sea_level_pressure)) {
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std::cerr << "警告：海平面气压值 " << sea_level_pressure
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<< " hPa 可能超出合理范围。使用默认值 1013.25 hPa。" << std::endl;
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sea_level_pressure_ = 1013.25f;
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}
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}
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float AltitudeCalculator::calculateAltitude(float pressure) const {
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if (!isValidPressure(pressure)) {
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std::cerr << "错误：无效的气压值 " << pressure << " hPa" << std::endl;
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return 0.0f;
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}
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return barometricFormula(pressure, sea_level_pressure_);
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}
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float AltitudeCalculator::calculateRelativeHeight(float current_altitude, float base_altitude) {
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return current_altitude - base_altitude;
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}
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void AltitudeCalculator::setSeaLevelPressure(float pressure) {
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if (isValidPressure(pressure)) {
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sea_level_pressure_ = pressure;
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std::cout << "海平面气压已更新为: " << pressure << " hPa" << std::endl;
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} else {
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std::cerr << "错误：无效的海平面气压值 " << pressure << " hPa" << std::endl;
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}
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}
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float AltitudeCalculator::metersToFeet(float meters) {
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return meters * 3.28084f;
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}
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float AltitudeCalculator::feetToMeters(float feet) {
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return feet * 0.3048f;
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}
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bool AltitudeCalculator::isValidPressure(float pressure) {
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// 合理的气压范围：300 hPa (约9000米高度) 到 1100 hPa (海平面以下)
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return pressure >= 300.0f && pressure <= 1100.0f;
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}
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bool AltitudeCalculator::isValidAltitude(float altitude) {
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// 合理的高度范围：-500米 (地下) 到 9000米 (珠峰高度)
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return altitude >= -500.0f && altitude <= 9000.0f;
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}
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float AltitudeCalculator::barometricFormula(float pressure, float sea_level_pressure) {
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if (pressure <= 0.0f || sea_level_pressure <= 0.0f) {
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return 0.0f;
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}
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// 气压高度公式（国际标准大气模型）
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// h = (T0 / L) * (1 - (P / P0)^(R*L / (g*M)))
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// 防止除以零
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if (LAPSE_RATE == 0.0f) {
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return 0.0f;
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}
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// 计算压力比
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float pressure_ratio = pressure / sea_level_pressure;
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// 检查压力比是否合理
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if (pressure_ratio <= 0.0f) {
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return 0.0f;
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}
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// 计算指数部分
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float exponent = (UNIVERSAL_GAS_CONSTANT * LAPSE_RATE) /
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(STANDARD_GRAVITY * MOLAR_MASS_AIR);
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// 计算高度
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float altitude = (STANDARD_TEMPERATURE / LAPSE_RATE) *
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(1.0f - std::pow(pressure_ratio, exponent));
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// 验证计算结果
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if (!isValidAltitude(altitude)) {
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std::cerr << "警告：计算出的高度值 " << altitude
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<< " 米可能超出合理范围。" << std::endl;
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}
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return altitude;
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} |