Automatic system AV-1SM is a part of strategic bomber Tu-160 navigation flight complex. System is meant for stellar monitoring of inertial navigation platform gyro drift by measuring stellar angular position relative to platform base control element.
AV-1SM system allows measuring angular coordinates of stars up to 4th magnitude in solid angle 100 degrees against the day background with mean square error of 8 angular seconds. Stellar guidance and measuring angular coordinates of stars is performed by means of biaxial orthodromic suspension with erection torque motors and induction angle-data transmitters on the axes. Stellar angular position detection is performed in scanning mode by means of commands from airborne computer.