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Tools: Change sign convention used by thermal calibrator

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The flight code assumes corrections have the same sign as the sensor bias error and are subtracted from the raw reading
This commit is contained in:
Paul Riseborough
2017-01-27 08:42:36 +11:00
committed by Lorenz Meier
parent c829e27a02
commit f9b75e68c9
1 changed files with 3 additions and 4 deletions
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Tools/process_sensor_caldata.py
+3 -4
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@@ -71,8 +71,7 @@ def temp_calibration(data, topic, fields, units, label):
'type': 'FLOAT', 'type': 'FLOAT',
} }
# curve fit the data for corrections - note # curve fit the data for corrections - note corrections have same sign as sensor bias and will need to be subtracted from the raw reading to remove the bias
# corrections have oppsite sign to sensor bias
try: try:
params['ID']['val'] = int(np.median(data['device_id'])) params['ID']['val'] = int(np.median(data['device_id']))
except: except:
@@ -90,7 +89,7 @@ def temp_calibration(data, topic, fields, units, label):
temp_resample = temp_rel_resample + params['TREF']['val'] temp_resample = temp_rel_resample + params['TREF']['val']
for i, field in enumerate(fields): for i, field in enumerate(fields):
coef = np.polyfit(temp_rel, -data[field], 3) coef = np.polyfit(temp_rel, data[field], 3)
for j in range(3): for j in range(3):
params['X{:d}_{:d}'.format(3-j, i)]['val'] = float(coef[j]) params['X{:d}_{:d}'.format(3-j, i)]['val'] = float(coef[j])
fit_coef = np.poly1d(coef) fit_coef = np.poly1d(coef)
@@ -99,7 +98,7 @@ def temp_calibration(data, topic, fields, units, label):
# draw plots # draw plots
plt.subplot(len(fields), 1, i + 1) plt.subplot(len(fields), 1, i + 1)
plt.plot(data['temperature'], data[field], 'b') plt.plot(data['temperature'], data[field], 'b')
plt.plot(temp_resample, -resample, 'r') plt.plot(temp_resample, resample, 'r')
plt.title('{:s} Bias vs Temperature'.format(topic)) plt.title('{:s} Bias vs Temperature'.format(topic))
plt.ylabel('{:s} bias {:s}'.format(field, units)) plt.ylabel('{:s} bias {:s}'.format(field, units))
plt.xlabel('temperature (degC)') plt.xlabel('temperature (degC)')