Aerospace Instrument-Making Annotation << Back About antijamming estimation of state vector of a strapdown navigation system of aircrafts V.A. Pogorelov For strapdown navigation system, a measuring complex of which involves three accelerometers, three angular-rate sensors and a barometric altimeter, equations of the state vector and its observer are obtained, which use nonlinear filtration methods providing required estimation accuracy under arbitrary spatial maneuver of aircraft.