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Merge pull request #595 from ut-issl/feature/add-position-observer
Add orbit observer
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data/sample/initialize_files/components/orbit_observer.ini
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[ORBIT_OBSERVER] | ||
// Noise definition frame | ||
// INERTIAL: Inertial frame | ||
// RTN: RTN frame | ||
noise_frame = INERTIAL | ||
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// Standard deviation of position and velocity noise [m, m/s] | ||
// The frame definition can be selected above | ||
noise_standard_deviation(0) = 1000 // Position-X | ||
noise_standard_deviation(1) = 2000 // Position-Y | ||
noise_standard_deviation(2) = 3000 // Position-Z | ||
noise_standard_deviation(3) = 30 // Velocity-X | ||
noise_standard_deviation(4) = 20 // Velocity-Y | ||
noise_standard_deviation(5) = 10 // Velocity-Z | ||
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[COMPONENT_BASE] | ||
// Prescaler with respect to the component update period | ||
prescaler = 1 |
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# | ||
# Plot orbit observer | ||
# | ||
# arg[1] : read_file_tag : time tag for default CSV output log file. ex. 220627_142946 | ||
# | ||
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# | ||
# Import | ||
# | ||
# plots | ||
import matplotlib.pyplot as plt | ||
# numpy | ||
import numpy as np | ||
# local function | ||
from common import find_latest_log_tag | ||
from common import add_log_file_arguments | ||
from common import read_3d_vector_from_csv | ||
from common import read_scalar_from_csv | ||
# arguments | ||
import argparse | ||
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# Arguments | ||
aparser = argparse.ArgumentParser() | ||
aparser = add_log_file_arguments(aparser) | ||
aparser.add_argument('--no-gui', action='store_true') | ||
args = aparser.parse_args() | ||
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# | ||
# Read Arguments | ||
# | ||
# log file path | ||
path_to_logs = args.logs_dir | ||
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read_file_tag = args.file_tag | ||
if read_file_tag == None: | ||
print("file tag does not found. use latest.") | ||
read_file_tag = find_latest_log_tag(path_to_logs) | ||
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print("log: " + read_file_tag) | ||
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# | ||
# CSV file name | ||
# | ||
read_file_name = path_to_logs + '/' + 'logs_' + read_file_tag + '/' + read_file_tag + '_default.csv' | ||
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# | ||
# Data read and edit | ||
# | ||
# Read S2E CSV | ||
time = read_scalar_from_csv(read_file_name, 'elapsed_time[s]') | ||
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measured_position_eci_m = read_3d_vector_from_csv(read_file_name, 'orbit_observer_position_i', 'm') | ||
true_position_eci_m = read_3d_vector_from_csv(read_file_name, 'spacecraft_position_i', 'm') | ||
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measured_velocity_eci_m_s = read_3d_vector_from_csv(read_file_name, 'orbit_observer_velocity_i', 'm/s') | ||
true_velocity_eci_m_s = read_3d_vector_from_csv(read_file_name, 'spacecraft_velocity_i', 'm/s') | ||
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# Statistics | ||
position_error_m = measured_position_eci_m[:, 1:] - true_position_eci_m[:, 1:] | ||
position_average = [0.0, 0.0, 0.0] | ||
position_standard_deviation = [0.0, 0.0, 0.0] | ||
velocity_error_m = measured_velocity_eci_m_s[:, 1:] - true_velocity_eci_m_s[:, 1:] | ||
velocity_average = [0.0, 0.0, 0.0] | ||
velocity_standard_deviation = [0.0, 0.0, 0.0] | ||
for i in range(3): | ||
position_average[i] = position_error_m[i].mean() | ||
position_standard_deviation[i] = position_error_m[i].std() | ||
velocity_average[i] = velocity_error_m[i].mean() | ||
velocity_standard_deviation[i] = velocity_error_m[i].std() | ||
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# | ||
# Plot | ||
# | ||
unit = ' m' | ||
fig, axis = plt.subplots(3, 1, squeeze = False, tight_layout = True, sharex = True) | ||
axis[0, 0].plot(time[0], measured_position_eci_m[0], marker=".", c="red", label="MEASURED-X") | ||
axis[0, 0].plot(time[0], true_position_eci_m[0], marker=".", c="orange", label="TRUE-X") | ||
axis[0, 0].text(0.01, 0.99, "Error average:" + format(position_average[0], '+.2e') + unit, verticalalignment = 'top', transform = axis[0, 0].transAxes) | ||
axis[0, 0].text(0.01, 0.79, "Standard deviation:" + format(position_standard_deviation[0], '+.2e') + unit, verticalalignment = 'top', transform = axis[0, 0].transAxes) | ||
axis[0, 0].legend(loc = 'upper right') | ||
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axis[1, 0].plot(time[0], measured_position_eci_m[1], marker=".", c="green", label="MEASURED-Y") | ||
axis[1, 0].plot(time[0], true_position_eci_m[1], marker=".", c="yellow", label="TRUE-Y") | ||
axis[1, 0].text(0.01, 0.99, "Error average:" + format(position_average[1], '+.2e') + unit, verticalalignment = 'top', transform = axis[1, 0].transAxes) | ||
axis[1, 0].text(0.01, 0.79, "Standard deviation:" + format(position_standard_deviation[1], '+.2e') + unit, verticalalignment = 'top', transform = axis[1, 0].transAxes) | ||
axis[1, 0].legend(loc = 'upper right') | ||
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axis[2, 0].plot(time[0], measured_position_eci_m[2], marker=".", c="blue", label="MEASURED-Z") | ||
axis[2, 0].plot(time[0], true_position_eci_m[2], marker=".", c="purple", label="TRUE-Z") | ||
axis[2, 0].text(0.01, 0.99, "Error average:" + format(position_average[2], '+.2e') + unit, verticalalignment = 'top', transform = axis[2, 0].transAxes) | ||
axis[2, 0].text(0.01, 0.79, "Standard deviation:" + format(position_standard_deviation[2], '+.2e') + unit, verticalalignment = 'top', transform = axis[2, 0].transAxes) | ||
axis[2, 0].legend(loc = 'upper right') | ||
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fig.suptitle("Orbit observer position results @ ECI") | ||
fig.supylabel("Position [m]") | ||
fig.supxlabel("Time [s]") | ||
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unit = ' m/s' | ||
fig, axis = plt.subplots(3, 1, squeeze = False, tight_layout = True, sharex = True) | ||
axis[0, 0].plot(time[0], measured_velocity_eci_m_s[0], marker=".", c="red", label="MEASURED-X") | ||
axis[0, 0].plot(time[0], true_velocity_eci_m_s[0], marker=".", c="orange", label="TRUE-X") | ||
axis[0, 0].text(0.01, 0.99, "Error average:" + format(velocity_average[0], '+.2e') + unit, verticalalignment = 'top', transform = axis[0, 0].transAxes) | ||
axis[0, 0].text(0.01, 0.79, "Standard deviation:" + format(velocity_standard_deviation[0], '+.2e') + unit, verticalalignment = 'top', transform = axis[0, 0].transAxes) | ||
axis[0, 0].legend(loc = 'upper right') | ||
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axis[1, 0].plot(time[0], measured_velocity_eci_m_s[1], marker=".", c="green", label="MEASURED-Y") | ||
axis[1, 0].plot(time[0], true_velocity_eci_m_s[1], marker=".", c="yellow", label="TRUE-Y") | ||
axis[1, 0].text(0.01, 0.99, "Error average:" + format(velocity_average[1], '+.2e') + unit, verticalalignment = 'top', transform = axis[1, 0].transAxes) | ||
axis[1, 0].text(0.01, 0.79, "Standard deviation:" + format(velocity_standard_deviation[1], '+.2e') + unit, verticalalignment = 'top', transform = axis[1, 0].transAxes) | ||
axis[1, 0].legend(loc = 'upper right') | ||
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axis[2, 0].plot(time[0], measured_velocity_eci_m_s[2], marker=".", c="blue", label="MEASURED-Z") | ||
axis[2, 0].plot(time[0], true_velocity_eci_m_s[2], marker=".", c="purple", label="TRUE-Z") | ||
axis[2, 0].text(0.01, 0.99, "Error average:" + format(velocity_average[2], '+.2e') + unit, verticalalignment = 'top', transform = axis[2, 0].transAxes) | ||
axis[2, 0].text(0.01, 0.79, "Standard deviation:" + format(velocity_standard_deviation[2], '+.2e') + unit, verticalalignment = 'top', transform = axis[2, 0].transAxes) | ||
axis[2, 0].legend(loc = 'upper right') | ||
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fig.suptitle("Orbit observer velocity results @ ECI") | ||
fig.supylabel("Velocity [m/s]") | ||
fig.supxlabel("Time [s]") | ||
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# Data save | ||
if args.no_gui: | ||
plt.savefig(read_file_tag + "_orbit_observer.png") # save last figure only | ||
else: | ||
plt.show() |
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/* | ||
* @file orbit_observer.cpp | ||
* @brief Ideal component which can observe orbit | ||
*/ | ||
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#include "orbit_observer.hpp" | ||
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#include <library/initialize/initialize_file_access.hpp> | ||
#include <library/randomization/global_randomization.hpp> | ||
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OrbitObserver::OrbitObserver(const int prescaler, ClockGenerator* clock_generator, const NoiseFrame noise_frame, | ||
const libra::Vector<6> error_standard_deviation, const Orbit& orbit) | ||
: Component(prescaler, clock_generator), noise_frame_(noise_frame), orbit_(orbit) { | ||
for (size_t i = 0; i < 6; i++) { | ||
normal_random_noise_[i].SetParameters(0.0, error_standard_deviation[i], global_randomization.MakeSeed()); | ||
} | ||
} | ||
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void OrbitObserver::MainRoutine(const int time_count) { | ||
UNUSED(time_count); | ||
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// Calc noise | ||
libra::Vector<3> position_error_i_m{0.0}; | ||
libra::Vector<3> position_error_rtn_m{0.0}; | ||
libra::Vector<3> velocity_error_i_m_s{0.0}; | ||
libra::Vector<3> velocity_error_rtn_m_s{0.0}; | ||
libra::Quaternion q_i2rtn = orbit_.CalcQuaternion_i2lvlh(); | ||
switch (noise_frame_) { | ||
case NoiseFrame::kInertial: | ||
for (size_t axis = 0; axis < 3; axis++) { | ||
position_error_i_m[axis] = normal_random_noise_[axis]; | ||
velocity_error_i_m_s[axis] = normal_random_noise_[axis + 3]; | ||
} | ||
break; | ||
case NoiseFrame::kRtn: | ||
for (size_t axis = 0; axis < 3; axis++) { | ||
position_error_rtn_m[axis] = normal_random_noise_[axis]; | ||
velocity_error_rtn_m_s[axis] = normal_random_noise_[axis + 3]; | ||
} | ||
// Frame conversion | ||
position_error_i_m = q_i2rtn.InverseFrameConversion(position_error_rtn_m); | ||
// For zero bias noise, we do not need to care the frame rotation effect. | ||
velocity_error_i_m_s = q_i2rtn.InverseFrameConversion(velocity_error_rtn_m_s); | ||
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break; | ||
default: | ||
break; | ||
} | ||
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// Get observed value | ||
observed_position_i_m_ = orbit_.GetPosition_i_m() + position_error_i_m; | ||
observed_velocity_i_m_s_ = orbit_.GetVelocity_i_m_s() + velocity_error_i_m_s; | ||
} | ||
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std::string OrbitObserver::GetLogHeader() const { | ||
std::string str_tmp = ""; | ||
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std::string head = "orbit_observer_"; | ||
str_tmp += WriteVector(head + "position", "i", "m", 3); | ||
str_tmp += WriteVector(head + "velocity", "i", "m/s", 3); | ||
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return str_tmp; | ||
} | ||
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std::string OrbitObserver::GetLogValue() const { | ||
std::string str_tmp = ""; | ||
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str_tmp += WriteVector(observed_position_i_m_, 16); | ||
str_tmp += WriteVector(observed_velocity_i_m_s_, 16); | ||
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return str_tmp; | ||
} | ||
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NoiseFrame SetNoiseFrame(const std::string noise_frame) { | ||
if (noise_frame == "INERTIAL") { | ||
return NoiseFrame::kInertial; | ||
} else if (noise_frame == "RTN") { | ||
return NoiseFrame::kRtn; | ||
} else { | ||
std::cerr << "[WARNINGS] Orbit observer noise frame is not defined!" << std::endl; | ||
std::cerr << "The noise frame is automatically initialized as INERTIAL" << std::endl; | ||
return NoiseFrame::kInertial; | ||
} | ||
} | ||
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OrbitObserver InitializeOrbitObserver(ClockGenerator* clock_generator, const std::string file_name, const Orbit& orbit) { | ||
// General | ||
IniAccess ini_file(file_name); | ||
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// CompoBase | ||
int prescaler = ini_file.ReadInt("COMPONENT_BASE", "prescaler"); | ||
if (prescaler <= 1) prescaler = 1; | ||
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// Noise | ||
const NoiseFrame noise_frame = SetNoiseFrame(ini_file.ReadString("ORBIT_OBSERVER", "noise_frame")); | ||
libra::Vector<6> noise_standard_deviation; | ||
ini_file.ReadVector("ORBIT_OBSERVER", "noise_standard_deviation", noise_standard_deviation); | ||
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OrbitObserver orbit_observer(prescaler, clock_generator, noise_frame, noise_standard_deviation, orbit); | ||
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return orbit_observer; | ||
} |
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/* | ||
* @file orbit_observer.hpp | ||
* @brief Ideal component which can observe orbit | ||
*/ | ||
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#ifndef S2E_COMPONENTS_IDEAL_ORBIT_OBSERVER_HPP_ | ||
#define S2E_COMPONENTS_IDEAL_ORBIT_OBSERVER_HPP_ | ||
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#include <dynamics/orbit/orbit.hpp> | ||
#include <library/logger/loggable.hpp> | ||
#include <library/math/vector.hpp> | ||
#include <library/randomization/normal_randomization.hpp> | ||
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#include "../base/component.hpp" | ||
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/** | ||
* @enum NoiseFrame | ||
* @brief Noise definition frame | ||
*/ | ||
enum class NoiseFrame { | ||
kInertial, //!< Inertial frame | ||
kRtn, //!< RTN frame | ||
}; | ||
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/* | ||
* @class OrbitObserver | ||
* @brief Ideal component which can observe orbit | ||
*/ | ||
class OrbitObserver : public Component, public ILoggable { | ||
public: | ||
/** | ||
* @fn OrbitObserver | ||
* @brief Constructor without power port | ||
* @param [in] prescaler: Frequency scale factor for update | ||
* @param [in] clock_generator: Clock generator | ||
* @param [in] noise_frame: Error frame definition | ||
* @param [in] error_standard_deviation: Position and Velocity standard deviation noise [m, m/s] | ||
* @param [in] orbit: Orbit information | ||
*/ | ||
OrbitObserver(const int prescaler, ClockGenerator* clock_generator, const NoiseFrame noise_frame, const libra::Vector<6> error_standard_deviation, | ||
const Orbit& orbit); | ||
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/** | ||
* @fn ~AttitudeObserver | ||
* @brief Destructor | ||
*/ | ||
~OrbitObserver() {} | ||
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// Override functions for Component | ||
/** | ||
* @fn MainRoutine | ||
* @brief Main routine for sensor observation | ||
*/ | ||
void MainRoutine(const int time_count) override; | ||
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// Override ILoggable | ||
/** | ||
* @fn GetLogHeader | ||
* @brief Override GetLogHeader function of ILoggable | ||
*/ | ||
virtual std::string GetLogHeader() const override; | ||
/** | ||
* @fn GetLogValue | ||
* @brief Override GetLogValue function of ILoggable | ||
*/ | ||
virtual std::string GetLogValue() const override; | ||
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/** | ||
* @fn GetPosition_i_m | ||
* @brief Return observed position | ||
*/ | ||
inline const libra::Vector<3> GetPosition_i_m() const { return observed_position_i_m_; }; | ||
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/** | ||
* @fn GetVelocity_i_m_s | ||
* @brief Return observed velocity | ||
*/ | ||
inline const libra::Vector<3> GetVelocity_i_m_s() const { return observed_velocity_i_m_s_; }; | ||
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protected: | ||
libra::Vector<3> observed_position_i_m_{0.0}; //!< Observed position @ inertial frame [m] | ||
libra::Vector<3> observed_velocity_i_m_s_{0.0}; //!< Observed velocity @ inertial frame [m/s] | ||
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NoiseFrame noise_frame_; //!< Noise definition frame | ||
libra::NormalRand normal_random_noise_[6]; //!< Position and Velocity noise [m, m/s] | ||
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// Observed variables | ||
const Orbit& orbit_; //!< Orbit information | ||
}; | ||
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/** | ||
* @fn SetNoiseFrame | ||
* @brief Set NoiseFrame by string | ||
* @param [in] noise_frame: Noise frame name | ||
* @return noise frame | ||
*/ | ||
NoiseFrame SetNoiseFrame(const std::string noise_frame); | ||
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/** | ||
* @fn InitStarSensor | ||
* @brief Initialize functions for StarSensor without power port | ||
* @param [in] clock_generator: Clock generator | ||
* @param [in] file_name: Path to the initialize file | ||
* @param [in] orbit: Orbit information | ||
*/ | ||
OrbitObserver InitializeOrbitObserver(ClockGenerator* clock_generator, const std::string file_name, const Orbit& orbit); | ||
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#endif // S2E_COMPONENTS_IDEAL_ORBIT_OBSERVER_HPP_ |
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