LV1b IMU Calibration Page
Here's our best guess to the linear calibration constants for the LV1b IMU:
|
Sensor |
Calibration Equation |
|
X |
g's = (raw ADC) / (0.624 V/g * (6.025 V / 5 V) * (4096 counts/5 V)) |
|
Y |
g's = (raw ADC) / (0.624 V/g * (6.025 V / 5 V) * (4096 counts/5 V)) |
|
Z |
g's = (raw ADC) / (0.038 V/g * (6.025 V / 5 V) * (4096 counts/5 V)) |
|
Q |
g's = (raw ADC) / (0.038 V/g * (6.025 V / 5 V) * (4096 counts/5 V)) |
|
Roll |
°/s = (raw ADC) / (5 * 1.1628) |
|
Pitch |
Same as roll? |
|
Yaw |
Same as roll? |
- Note that the (6.025 V / 5V) is for the fact that we ran the ratiometric sensors at 6.025V, but the ADC was expecting them to be running at 5V
- It's a 12bit ADC, thus 4096 counts over the single sided 5V supply
*OLD OLD OLD:*
So, we built this IMU and it's cool... but what does it do? To find out, we did a calibration run on October 5, 2000 (prior to the 10/07/2000) launch. Although lacking in many ways, the analysis of the calibration data should be able to tell us:
- Linear models of the linear accelerometers (X, Y, Z and "Q")
- By fitting a line to three points of acceleration values (+1g, 0g, -1g).
- Note that the X accelerometer data was corrupted.
- Models of the rate gyroscopes (roll, pitch and yaw)
- By fitting a line to two points of rotational values (0rad/s,?rad/s)
Attached (see below) are the raw data and processed calibration data files.