PSAS/ ImuCalibrationLV1b

# 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 &deg;/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.