I compared the IP spectra measured by the geophones in the following cases. The IP was controlled with the LVDTs and the geophones blended at 50mHz (110mHz for Yaw).
- Without sensor correction.
- With sensor correction using the present filter "AC" (80mHz resonant high pass).
- With sensor correction using the modified filter "AC2" (1mHz high pass).
The filter "AC2" reduced the noise due to the LVDT around 100mHz.
