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Aerospace Instrument-Making

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Estimation of parameters of motion object by integrated navigation system using the data of E-maps
Lukasiewicz V.I. Sokolov S.V. Stazharova L.N.

Possibility of use of E-maps information about spatial models of a trajectory of object is investigated at construction of navigation algorithms tight-coupled inertial-satellite systems. For aeronautical and space objects moving from the known spatial trajectories, the use of electronic maps allows to describe analytically the trajectory of an object by its piecewise constant approximation of height and piecewise Great Circle – on the sphere of the Earth (which is especially true for civil aviation and communication satellites). Because these models trajectories are formed on the base of cartographic information, they are invariant to the nature of an object's motion and its physical model, making it all-purpose for any application to aerospace objects. The paper analyzes the possibility of using great circle path model for solving the problem of navigation in order to reduce the computational cost with a stochastic estimation of the navigation parameters, as well as improve the accuracy of object positioning. It is shown that application of the given models reduces dimension of an estimated vector of navigation parameters, reducing computing expenses, and allows in principle – without the use of additional algorithms, to solve a problem binding estimates coordi-nates and projections of linear velocity of the object to the true path of movement de-fined by an E-map.
Key words: navigation algorithms, the tight-coupled inertial-satellite systems, Great-Circle line model of a trajectory, E-maps.


Contacts: E-mail: lukasevichvi@cmp.ru

Pp. 24-33.

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