Abstract: A roll measurement system for a flight vehicle, such as a tank-launched ged projectile or guided missile, includes a power source and a pulsed laser, such as a laser diode, which propagates a laser beam which is focused into a narrow conical beam and directed toward the earth. The laser beam's reflections from the earth are detected, for example, by a photo-diode, and converted into an analog electrical signal. The signal is converted to digital form and analyzed to determine its nadir (the shortest path-length to the earth). A microcomputer compares the immediate nadir determination with stored nadir determinations to compute the angle and rate of roll of the flight vehicle.

Abstract: The invention concerns a technique and apparatus for protecting sensitive ectronic components against the high accelerations encountered in a tank-powered projectile, for instance. A first ring is placed on a circuit board and filled with an RTV compound. A cap is placed on the first ring to force excess RTV compound from the first ring, and is removed once the RTV compound cures. A second shorter ring is placed about the RTV compound and is attached to the circuit board. A flat plate is then used to press the RTV compound into any voids which may exist between elements mounted on the circuit board. Circuit modules created in this manner may be stacked upon one another and interconnected.