Abstract

In the article navigation compensating pendulous accelerometer (CPA) with silicon sensing element and capacitive position sensor AKS-05 production SDP SE "Arsenal" is investigated. CPAs are used as the basic sensors of primary measurement information of the strapdown inertial navigation systems (SINS) based on the metrological model (MM). It is known that the errors of CPAs produce errors in tasks solved by these systems. By MM of CPA the authors have offered to understand the mathematical model of its output signal (real transfer function (TF)) and the mathematical model of its errors (MME) presented in the form of functional dependencies on the measured projection of apparent linear acceleration and technological factors which affect the CPA during its production. The sufficient for the practical usage during solving measuring tasks of these systems, the MM of CPA is defined. Coefficients of TF and MME are determined and entered in the certificate of the results of acceptance testing CPA. All systematic errors are compensated algorithmically composed of SINS. The authors have developed and described methods of the experimental determination of the coefficients of the MM according to the results of its metrological testing. The method of test turnings in the Earth’s gravitation field was used for CPA calibration. In addition, method for building an amplitude-frequency characteristic of CPA and method for determining the deviation from linearity of CPA TF within the acceleration measurement range have been developed. The tests of navigation CPA were carried out on the precision equipment of the enterprise, which allows to determine all coefficients of the MM. The accelerometer AKS-05 have the following metrological performance: bias – is less than 10 mg; bias stability in run – is not more than 30 mkg/4h; bias stability run to run – is not more than 10 mg; bias temperature sensitivity – is not more than 50 mkg/ºC; scale factor random error – is not more than 80 ppm; scale factor temperature sensitivity – is not more than 100 ppm/ºC; the error of the base plane – is not more than 3000 mkrad; linear acceleration measurement range –±45g; operating temperatures range – (−40 ... +85) ºC. In conclusion the table with metrological performance of different manufacturers of navigation CPA is given. The results of experimental investigations have shown that navigation CPA production SDP SE "Arsenal" is not inferior to foreign analogues, and can effectively be used in SINS high accuracy.

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