Does anyone have knowledge of Soyuz ascent navigation. I know on entry there is a single attitude gyro, a couple of sets of rate gyros, and body fixed accelerometers. My key question is this, "Does it have an INS/IMU?"
Certainly Soyuz-U and Soyuz-FG have nothing like you mention. They do have a lot of gears in their ascent nav system, though.
Most Russian designs use inertial guidance, with corrections supplied by stations along the ground track.