SET FOR INITIAL ADJUSTMENT OF INERTIAL SYSTEM Russian patent published in 2004 - IPC

FIELD: flying vehicle navigational systems.

SUBSTANCE: proposed set is used for precision initial adjustment of inertial navigational systems mounted on base which is movable relative to earth (ship, carrier aircraft). Proposed set includes inertial system to be adjusted, reference navigational system of carrier, intermediate navigational system, discrepancy forming units, base motion calculation units, filtration units and state analysis units. Set contains two correction units. One correction unit includes reference navigational system of carrier used as corrector and other correction unit intermediate navigational system used as corrector and inertial system to be adjusted used as system being corrected. Each correction circuit includes state analysis unit, discrepancy forming unit, filtration unit and base motion calculation unit. Specific feature of adjustment performed on movable base under conditions of promptly changing speeds and angles requires accurate external information transmitted to system being adjusted, viz.: completeness of information, permissible lag of information transmission and rate of renewal and transmission of data. Besides that, duration of adjustment is very important. Said requirements may be fulfilled if system uses as source of reference correction information for system to be adjusted intermediate navigational system located near start position of flying vehicle on carrier; precision class of this system is better than that of initial navigational system to be adjusted. Adjustment of intermediate navigational system is performed by information of reference navigational system of carrier. Correction circuits of system being adjusted and intermediate initial navigational system are identical; they include discrepancy forming units for indication of discrepancy between corrector and system being corrected, filtration units and state analysis units. Filtration of discrepancies formed in discrepancy forming units ensures estimation of errors of systems being corrected. Estimation is furnished in form of feedback signals to inputs of initial navigational system for correction. Correction circuits are additionally provided with base motion calculation units for estimation of parameters of motion of base by information of intermediate initial navigational system which is later used in filtration algorithms, thus enhancing precision and efficiency. Motion of base (for example, ship's motions) becomes useful information instead of disturbing factor for precision adjustment of initial navigational system of flying vehicle (both relative to vertical and in azimuth).

EFFECT: enhanced accuracy.

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