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What is the GPS module being used onboard the 3DM-GX3-45?

u-blox 5 AMY module.

For U.S. entities, is it possible to get a 3DM-GX3-45 without the COCOM GPS limits?

No, our GPS supplier does not produce modules without this limitation.

What is the maximum acceleration and jerk (first derivative of acceleration) that the 3DM-GX3-45 GPS will maintain lock?

4g maximum acceleration (must use Airborne dynamics mode). We have no published numbers on jerk from the GPS module manufacturer.

Does the 3DM-GX3-45 filter estimate the attitude first and then position (cascaded filters) or is it one large filter?

The attitude, position, velocity, and sensor bias states are all states within the same filter; therefore, they are calculated together.

Does the 3DM-GX3-45 use the output of the GPS filter (latitude, longitude, altitude) when doing the overall position and attitude estimates?

The attitude, position, velocity, and sensor bias states are all states within the same filter; therefore, they are calculated together.

Does the 3DM-GX3-45 use a tightly coupled GPS/INS Kalman filter using GPS pseudo-ranges?

The 3DM-GX3-45 implements a loosely-coupled filter that uses the GPS solution (position and velocity) as an input to the filter.

Is the 3DM-GX3-45 GPS PPS (pulse per second) signal available to outside devices?

The GPS PPS signal is available on pin 7. It can drive one high impedance TTL input.

Can my 3DM-GX3-35 be upgraded to a 3DM-GX3-45?

No. A 3DM-GX3-35 can not be upgraded to a 3DM-GX3-45.

Is there an option to turn off the 3DM-GX3-45 GPS and run just the AHRS?

Yes, this can be done easily in software.

Is there a Kalman Filter implemented in the 3DM-GX3-45?

Yes. The Theory of Operation document will be of interest. It is available at: http://files.microstrain.com/3DM-GX3-45_Theory_of_Operation.pdf

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