def run_experiment(parameters):
# read parameters
cont_gyro_noise_std = parameters["cont_gyro_noise_std"]
cont_acc_noise_std = parameters["cont_acc_noise_std"]
rate_std_factor = parameters["rate_std_factor"]
acc_std_factor = parameters["acc_std_factor"]
rate_bias_driving_noise_std = parameters["rate_bias_driving_noise_std"]
cont_rate_bias_factor = parameters["cont_rate_bias_factor"]
acc_bias_driving_noise_std = parameters["acc_bias_driving_noise_std"]
cont_acc_bias_factor = parameters["cont_acc_bias_factor"]
p_acc = parameters["p_acc"]
p_gyro = parameters["p_gyro"]
p_std = parameters["p_std"]
sigma_pos = parameters["sigma_pos"]
sigma_vel = parameters["sigma_vel"]
sigma_rollpitch = parameters["sigma_rollpitch"]
sigma_yaw = parameters["sigma_yaw"]
sigma_err_acc_bias = parameters["sigma_err_acc_bias"]
sigma_err_gyro_bias = parameters["sigma_err_gyro_bias"]
N = parameters["N"]
doGNSS = parameters["doGNSS"]
debug = parameters["debug"]
dosavefigures = parameters["dosavefigures"]
figdir = parameters["figdir"]
doshowplot = parameters["doshowplot"]
# derived parameters
rate_std = rate_std_factor * cont_gyro_noise_std * np.sqrt(
1 / dt) # Hvorfor gange med en halv? (eq. 10.70)
acc_std = acc_std_factor * cont_acc_noise_std * np.sqrt(1 / dt)
cont_rate_bias_driving_noise_std = cont_rate_bias_factor * rate_bias_driving_noise_std / np.sqrt(
1 / dt)
cont_acc_bias_driving_noise_std = cont_acc_bias_factor * acc_bias_driving_noise_std / np.sqrt(
1 / dt)
R_GNSS = np.diag(p_std**2)
# %% Estimator
eskf = ESKF(
acc_std,
rate_std,
cont_acc_bias_driving_noise_std,
cont_rate_bias_driving_noise_std,
p_acc,
p_gyro,
S_a=S_a, # set the accelerometer correction matrix
S_g=S_g, # set the gyro correction matrix,
debug=
debug # TODO: False to avoid expensive debug checks, can also be suppressed by calling 'python -O run_INS_simulated.py'
)
# %% Allocate
x_est = np.zeros((steps, 16))
P_est = np.zeros((steps, 15, 15))
x_pred = np.zeros((steps, 16))
P_pred = np.zeros((steps, 15, 15))
delta_x = np.zeros((steps, 15))
NIS = np.zeros(gnss_steps)
NIS_x = np.zeros(gnss_steps)
NIS_y = np.zeros(gnss_steps)
NIS_z = np.zeros(gnss_steps)
NIS_xy = np.zeros(gnss_steps)
NEES_all = np.zeros(steps)
NEES_pos = np.zeros(steps)
NEES_vel = np.zeros(steps)
NEES_att = np.zeros(steps)
NEES_accbias = np.zeros(steps)
NEES_gyrobias = np.zeros(steps)
# %% Initialise
x_pred[0, POS_IDX] = np.array([0, 0, -5]) # starting 5 metres above ground
x_pred[0, VEL_IDX] = np.array([20, 0, 0]) # starting at 20 m/s due north
x_pred[
0,
6] = 1 # no initial rotation: nose to North, right to East, and belly down
# These have to be set reasonably to get good results
P_pred[0][POS_IDX**2] = sigma_pos**2 * np.eye(3)
P_pred[0][VEL_IDX**2] = sigma_vel**2 * np.eye(3)
P_pred[0][ERR_ATT_IDX**2] = np.diag(
[sigma_rollpitch, sigma_rollpitch, sigma_yaw])**2
P_pred[0][ERR_ACC_BIAS_IDX**2] = sigma_err_acc_bias**2 * np.eye(3)
P_pred[0][ERR_GYRO_BIAS_IDX**2] = sigma_err_gyro_bias**2 * np.eye(3)
# %% Run estimation
# run this file with 'python -O run_INS_simulated.py' to turn of assertions and get about 8/5 speed increase for longer runs
GNSSk: int = 0 # keep track of current step in GNSS measurements
for k in tqdm.trange(N):
if doGNSS and timeIMU[k] >= timeGNSS[GNSSk]:
(
NIS[GNSSk],
NIS_x[GNSSk],
NIS_y[GNSSk],
NIS_z[GNSSk],
NIS_xy[GNSSk],
) = eskf.NIS_GNSS_position(x_pred[k], P_pred[k], z_GNSS[GNSSk],
R_GNSS, lever_arm)
x_est[k], P_est[k] = eskf.update_GNSS_position(
x_pred[k], P_pred[k], z_GNSS[GNSSk], R_GNSS, lever_arm)
assert np.all(np.isfinite(
P_est[k])), f"Not finite P_pred at index {k}"
GNSSk += 1
else:
# no updates, so let us take estimate = prediction
x_est[k] = x_pred[k]
P_est[k] = P_pred[k]
delta_x[k] = eskf.delta_x(x_est[k], x_true[k])
(
NEES_all[k],
NEES_pos[k],
NEES_vel[k],
NEES_att[k],
NEES_accbias[k],
NEES_gyrobias[k],
) = eskf.NEESes(x_est[k], P_est[k], x_true[k])
if k < N - 1:
x_pred[k + 1], P_pred[k + 1] = eskf.predict(
x_est[k], P_est[k], z_acceleration[k + 1], z_gyroscope[k + 1],
Ts_IMU[k + 1])
if eskf.debug:
assert np.all(np.isfinite(
P_pred[k])), f"Not finite P_pred at index {k + 1}"
# %% Consistency
confprob = 0.95
CI15 = np.array(scipy.stats.chi2.interval(confprob, 15)).reshape((2, 1))
CI3 = np.array(scipy.stats.chi2.interval(confprob, 3)).reshape((2, 1))
CI1 = np.array(scipy.stats.chi2.interval(confprob, 1)).reshape((2, 1))
CI2 = np.array(scipy.stats.chi2.interval(confprob, 2)).reshape((2, 1))
CI3N = np.array(scipy.stats.chi2.interval(confprob, 3 * N)) / N
CI15N = np.array(scipy.stats.chi2.interval(confprob, 15 * N)) / N
ANIS = NIS[:GNSSk].mean()
ANEES = NEES_all[:N].mean()
ANEES_pos = NEES_pos[:N].mean()
ANEES_vel = NEES_vel[:N].mean()
ANEES_att = NEES_att[:N].mean()
ANEES_accbias = NEES_accbias[:N].mean()
ANEES_gyrobias = NEES_gyrobias[:N].mean()
print(rf'{"ANEES:":<20} {ANEES:^25} {CI15N}')
print(rf'{"ANEESS_pos:":<20} {ANEES_pos:^25} {CI3N}')
print(rf'{"ANEES_vel:":<20} {ANEES_vel:^25} {CI3N}')
print(rf'{"ANEES_att:":<20} {ANEES_att:^25} {CI3N}')
print(rf'{"ANEES_accbias:":<20} {ANEES_accbias:^25} {CI3N}')
print(rf'{"ANEES_gyrobias:":<20} {ANEES_gyrobias:^25} {CI3N}')
print(rf'{"ANIS:":<20} {ANIS:^25} {CI3N}')
eul = np.apply_along_axis(quaternion_to_euler, 1, x_est[:N, ATT_IDX])
eul_true = np.apply_along_axis(quaternion_to_euler, 1, x_true[:N, ATT_IDX])
wrap_to_pi = lambda rads: (rads + np.pi) % (2 * np.pi) - np.pi
eul_error = wrap_to_pi(eul[:N] - eul_true[:N]) * 180 / np.pi
pos_err = np.linalg.norm(delta_x[:N, POS_IDX], axis=1)
meas_err = np.linalg.norm(x_true[99:N:100, POS_IDX] - z_GNSS[:GNSSk],
axis=1)
# %% plotting
dosavefigures = True
doplothandout = True
t = np.linspace(0, dt * (N - 1), N)
if doplothandout:
# 3d position plot
fig1, ax1 = plot.trajectoryPlot3D(x_est, x_true, z_GNSS, N, GNSSk)
fig1.tight_layout()
if dosavefigures: fig1.savefig(figdir + "ned.pdf")
# state estimation plot
fig2all, fig2pos, fig2vel, fig2ang, fig2ab, fig2gb = \
plot.stateplot(t, x_est, eul, N, "States estimates")
# fig2vehicle = plot.kinematicplot(t, x_est, eul, N, "Kinematic estimates")
# fig2bias = plot.biasplot(t, x_est, eul, N, "Bias estimates")
if dosavefigures:
fig2all.savefig(figdir + "state_estimates.pdf")
fig2pos.savefig(figdir + "estimate_pos.pdf")
fig2vel.savefig(figdir + "estimate_vel.pdf")
fig2ang.savefig(figdir + "estimate_eul.pdf")
fig2ab.savefig(figdir + "estimate_aclbias.pdf")
fig2gb.savefig(figdir + "estimate_gyrobias.pdf")
# state error plots
# fig3.tight_layout()
fig3all, fig3pos, fig3vel, fig3ang, fig3ab, fig3gb = \
plot.stateerrorplot(t, delta_x, eul_error, N, "State estimate errors")
if dosavefigures:
fig3all.savefig(figdir + "state_estimate_errors.pdf")
fig3pos.savefig(figdir + "estimate_error_pos.pdf")
fig3vel.savefig(figdir + "estimate_error_vel.pdf")
fig3ang.savefig(figdir + "estimate_errors_eul.pdf")
fig3ab.savefig(figdir + "estimate_errors_aclbias.pdf")
fig3gb.savefig(figdir + "estimate_errors_gyrobias.pdf")
# Error distance plot
fig4, axs4 = plt.subplots(2, 1, num=4, clear=True, sharex=True)
est_error = np.sqrt(np.mean(np.sum(delta_x[:N, POS_IDX]**2, axis=1)))
meas_error = np.sqrt(
np.mean(
np.sum((x_true[99:N:100, POS_IDX] - z_GNSS[:GNSSk])**2,
axis=1)))
axs4[0].plot(t, pos_err, label=f"Est error ({est_error:.3f})")
axs4[0].plot(np.arange(0, N, 100) * dt,
meas_err,
label=f"GNSS error ({meas_error:.3f})")
axs4[0].set(title=r"Position error $[m]$")
axs4[0].legend(loc='upper right')
vel_rmse = np.sqrt(np.mean(np.sum(delta_x[:N, VEL_IDX]**2, axis=1)))
axs4[1].plot(t,
np.linalg.norm(delta_x[:N, VEL_IDX], axis=1),
label=f"RMSE: {vel_rmse:.3f}")
axs4[1].set(title=r"Speed error $[m/s]$")
axs4[1].legend(loc='upper right')
fig4.tight_layout()
latexutils.save_value("Estimation error", f"{est_error:.3f}",
"csvs/sim_est_error_pos.csv")
latexutils.save_value("GNSS error", f"{meas_error:.3f}",
"csvs/sim_meas_error_pos.csv")
#fig4.tight_layout()
if dosavefigures:
fig4.savefig(figdir + "estimate_vs_measurement_error.pdf")
fig5, axs5 = plt.subplots(4, 1, num=5, clear=True, sharex=True)
fig5.subplots_adjust(hspace=0.4) # so ytick dont overlap
fig5.set_size_inches((3.5, 5))
insideCItot = np.mean(
(CI15[0] <= NEES_all[:N]) * (NEES_all[:N] <= CI15[1]))
plot.pretty_NEESNIS(axs5[0],
t,
NEES_all[:N],
"total",
CI15,
fillCI=True,
upperY=50)
axs5[0].legend(loc="upper right", ncol=1)
plot.pretty_NEESNIS(axs5[1],
t,
NEES_pos[:N],
"pos",
CI3,
fillCI=True,
upperY=20)
plot.pretty_NEESNIS(axs5[1],
t,
NEES_vel[:N],
"vel",
CI3,
fillCI=False,
upperY=20)
plot.pretty_NEESNIS(axs5[1],
t,
NEES_att[:N],
"att",
CI3,
fillCI=False,
upperY=20)
#axs5[1].plot([t[0], t[~0]], (CI3 @ np.ones((1, 2))).T)
# axs5[1].plot(t, (NEES_pos[0:N]).T, label="pos")
# axs5[1].plot(t, (NEES_vel[0:N]).T, label="vel")
# axs5[1].plot(t, (NEES_att[0:N]).T, label="att")
# axs5[1].set_ylim([0, 20])
axs5[1].legend(loc="best", ncol=3)
#axs5[2].plot([t[0], t[~0]], (CI3 @ np.ones((1, 2))).T)
plot.pretty_NEESNIS(axs5[2],
t,
NEES_accbias[:N],
"accel bias",
CI3,
fillCI=True,
upperY=20)
plot.pretty_NEESNIS(axs5[2],
t,
NEES_gyrobias[:N],
"gyro bias",
CI3,
fillCI=False,
upperY=20)
# axs5[2].plot(t, (NEES_accbias[0:N]).T, label="accel bias")
# axs5[2].plot(t, (NEES_gyrobias[0:N]).T, label="gyro bias")
# axs5[2].set_ylim([0, 20])
axs5[2].legend(loc="best", ncol=2)
t_gnssk = np.linspace(t[0], t[~0], GNSSk)
plot.pretty_NEESNIS(axs5[3],
t_gnssk,
NIS[:GNSSk],
"NIS",
CI3,
fillCI=True,
upperY=20)
# axs5[3].plot([t[0], t[~0]], (CI3 @ np.ones((1, 2))).T)
# axs5[3].plot(NIS[:GNSSk], label="NIS")
# axs5[3].set_ylim([0, 20])
axs5[3].legend(loc="upper right")
for ax in axs5:
ax.set_xlim([t[0], t[~0]])
#fig5.tight_layout()
insideCIpos = np.mean(
(CI3[0] <= NEES_pos[:N]) * (NEES_pos[:N] <= CI3[1]))
insideCIvel = np.mean(
(CI3[0] <= NEES_vel[:N]) * (NEES_vel[:N] <= CI3[1]))
insideCIatt = np.mean(
(CI3[0] <= NEES_att[:N]) * (NEES_att[:N] <= CI3[1]))
insideCIab = np.mean(
(CI3[0] <= NEES_accbias[:N]) * (NEES_accbias[:N] <= CI3[1]))
insideCIgb = np.mean(
(CI3[0] <= NEES_gyrobias[:N]) * (NEES_gyrobias[:N] <= CI3[1]))
insideCInis = np.mean(
(CI3[0] <= NIS[:GNSSk]) * (NIS[:GNSSk] <= CI3[1]))
print("Inside CI total", insideCItot)
print("Inside CI pos", insideCIpos)
print("Inside CI vel", insideCIvel)
print("Inside CI att", insideCIatt)
print("Inside CI ab", insideCIab)
print("Inside CI gb", insideCIgb)
print("Inside CI NIS", insideCInis)
#fig5.tight_layout()
if dosavefigures:
fig5.savefig(figdir + "nees_nis.pdf")
# boxplot
fig6, axs6 = plt.subplots(1,
3,
gridspec_kw={"width_ratios": [1, 1, 2]})
plot.boxplot(axs6[0], [NIS[:GNSSk]], 3, ["NIS"])
plot.boxplot(axs6[1], [NEES_all[0:N].T], 15, ["NEES"])
plot.boxplot(axs6[2], [
NEES_pos[0:N].T, NEES_vel[0:N].T, NEES_att[0:N].T,
NEES_accbias[0:N].T, NEES_gyrobias[0:N].T
], 3, ['pos', 'vel', 'att', 'accbias', 'gyrobias'])
fig6.tight_layout()
#fig6.tight_layout()
if dosavefigures:
fig6.savefig(figdir + "boxplot.pdf")
plot.plot_NIS(NIS_x, CI1, "NIS_x", confprob, dt, N, GNSSk)
plot.plot_NIS(NIS_y, CI1, "NIS_y", confprob, dt, N, GNSSk)
plot.plot_NIS(NIS_z, CI1, "NIS_z", confprob, dt, N, GNSSk)
plot.plot_NIS(NIS_xy, CI2, "NIS_xy", confprob, dt, N, GNSSk)
consistencydatas = [
dict(avg=ANEES, inside=insideCItot, text="NEES", CI=CI15N),
dict(avg=ANEES_pos, inside=insideCIpos, text="NEES pos", CI=CI3N),
dict(avg=ANEES_vel, inside=insideCIvel, text="NEES vel", CI=CI3N),
dict(avg=ANEES_att, inside=insideCIatt, text="NEES att", CI=CI3N),
dict(avg=ANEES_gyrobias,
inside=insideCIgb,
text="NEES gyro bias",
CI=CI3N),
dict(avg=ANEES_accbias,
inside=insideCIab,
text="NEES acc bias",
CI=CI3N),
dict(avg=ANIS, inside=insideCInis, text="NIS", CI=CI3N),
]
latexutils.save_consistency_results(consistencydatas,
"csvs/sim_consistency.csv")
if doshowplot:
plt.show()
for k in tqdm(range(N - start)):
if timeIMU[k] >= timeGNSS[GNSSk]:
R_GNSS = (0.5 * accuracy_GNSS[GNSSk])**2 * np.diag(
[1, 1, 1]) # Current GNSS covariance
(
NIS[GNSSk],
NIS_x[GNSSk],
NIS_y[GNSSk],
NIS_z[GNSSk],
NIS_xy[GNSSk],
) = eskf.NIS_GNSS_position(x_pred[k], P_pred[k], z_GNSS[GNSSk], R_GNSS,
lever_arm)
x_est[k], P_est[k] = eskf.update_GNSS_position(x_pred[k], P_pred[k],
z_GNSS[GNSSk], R_GNSS,
lever_arm)
if eskf.debug:
assert np.all(np.isfinite(
P_est[k])), f"Not finite P_pred at index {k}"
GNSSk += 1
else:
# no updates, so estimate = prediction
x_est[k] = x_pred[k]
P_est[k] = P_pred[k]
if k < N - 1:
x_pred[k + 1], P_pred[k + 1] = eskf.predict(x_est[k], P_est[k],
z_acceleration[k + 1],
z_gyroscope[k + 1],
# %% Initialise
x_pred[0, POS_IDX] = np.array([0, 0, -5]) # starting 5 metres above ground
x_pred[0, VEL_IDX] = np.array([20, 0, 0]) # starting at 20 m/s due north
x_pred[0, 6] = 1 # no initial rotation: nose to North, right to East, and belly down
# These have to be set reasonably to get good results
P_pred[0][POS_IDX ** 2] = np.eye(3)# TODO
P_pred[0][VEL_IDX ** 2] = np.eye(3)# TODO
P_pred[0][ERR_ATT_IDX ** 2] = np.eye(3)# TODO # error rotation vector (not quat)
P_pred[0][ERR_ACC_BIAS_IDX ** 2] = np.eye(3)# TODO
P_pred[0][ERR_GYRO_BIAS_IDX ** 2] = np.eye(3)# TODO
# %% Test: you can run this cell to test your implementation
dummy = eskf.predict(x_pred[0], P_pred[0], z_acceleration[0], z_gyroscope[0], dt)
dummy = eskf.update_GNSS_position(x_pred[0], P_pred[0], z_GNSS[0], R_GNSS, lever_arm)
# %% Run estimation
# run this file with 'python -O run_INS_simulated.py' to turn of assertions and get about 8/5 speed increase for longer runs
N: int = steps # TODO: choose a small value to begin with (500?), and gradually increase as you OK results
doGNSS: bool = True # TODO: Set this to False if you want to check that the predictions make sense over reasonable time lenghts
GNSSk: int = 0 # keep track of current step in GNSS measurements
for k in tqdm.trange(N):
if doGNSS and timeIMU[k] >= timeGNSS[GNSSk]:
NIS[GNSSk] = # TODO:
x_est[k], P_est[k] = # TODO:
assert np.all(np.isfinite(P_est[k])), f"Not finite P_pred at index {k}"
GNSSk += 1