METHOD TO SELECT VALID INFORMATION AND TO IDENTIFY FAILURES OF ACCELEROMETERS AND ANGULAR SPEED SENSORS WITH SIX METERS IN EACH TRACT OF PLATFORMLESS INERTIAL NAVIGATION SYSTEM OF AIRCRAFT Russian patent published in 2016 - IPC G01C21/20 

FIELD: aircraft engineering.

SUBSTANCE: invention relates to development of aircraft (AC) control systems, particularly, to valid data accessing and diagnostics of aircraft accelerometers and angular speed sensors (ASSs) with excess number of transducers and identification of their failures. In the method of selection of valid data and identification of transducers at each tract of the platformless inertial navigation system (PINS) containing six transducers, based on readings resulted from the cyclic timed inquiry on the transducers, sensitivity axes of three of them being non-coplanar and on the computation in every cycle of the vectors of apparent acceleration and angular speed with the help of magnitudes of aligner cosines of the transducer sensitivity axes. In compliance with this invention, said vectors are computed at all possible combinations of the three transducers. Vectors derived at every tract are distributed to groups including the four vectors calculated with the help of four transducers. The vectors of every group are used to calculate the mean vector and the index of scatter relative to said mean vector to define the minimum scatter index group among all groups of the tract in the current cycle and the mean vector of this group. Similar jobs are consecutively carried out, first, to the group composition that differs from the complete composition of groups by excluding the group with the first found scatter index and, then with two found minimum scatter index, to calculate the modules of difference between each of three mean vectors of said groups and mean vector calculated and written to computed memory as the valid vector of the previous cycle. The minimum difference module of said three modules is defined. The mean vector with the module of difference with the valid vector of the previous tract as the minimum is taken to be the valid vector of current cycle. Transducers failures are identified proceeding from the soundness of transducers their readings having been used to compute the valid vector and from the results of comparison with the tolerance of the transducer actual and computed readings difference module not used in the calculation of the valid vector and its estimated reading. Note here that said estimated reading is defined as the projection of the valid vector onto tested transducer sensitivity axis.

EFFECT: selection of valid data and faultless operation of measuring tract to two faults at every tract, identification of transducer faults at excess data in every PINS tract.

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