Scientists from the St. Petersburg Electrotechnical University “LETI” have proposed a unique method that will create test beds to calibrate inertial navigation strapdown systems that outperform their counterparts. The results of the experimental studies, which confirmed a 15-fold decrease in the standard deviation, are published in the journal Sensors.
The efficient operation of strapdown inertial navigation systems, which are at the heart of the high precision control systems of any moving object in the defense and space industries, is not possible without their calibration. Ground calibration of such systems is performed using test benches. They determine the systematic errors of inertial sensors (gyroscopes and accelerometers) and estimate the error vector on the measurements of the output signals from the inertial units and the data from the test benches.
The main task of such equipment is to ensure the high accuracy of the measurements necessary to obtain a reliable result. That is why all modern industrial enterprises engaged in the development of navigation systems are equipped with such test benches.
The efficiency of the benches largely depends on the means of angular measurements, which are used to control the movement of the rotating platforms of the benches. Usually, angular measurements involve a circular scale – the larger it is, the more accurate the measurement result. However, currently known measurement technologies based on radial scales have reached the technological limit, and further improvement in their accuracy is limited by the actual size of such scales. LETI scientists suggested using a new approach to angular measurements in test stands.
“The fundamentally new concept is based on the use of scales, which are a two-dimensional set of elements with a known location. The angle measurement in this method is performed by recording a 2D mark with the photodetector array. a digital camera with a suitable image This makes it possible to form an angle scale over a much smaller area and increase the accuracy of the measurements, “ said Yuri Filatov, project research director and head of the laser measurement and navigation systems department at LETI
The angular measurement technologies proposed by LETI scientists will form the basis for the development of a multifunctional series of dynamic test benches for the calibration and semi-natural simulation of inertial navigation systems and on-board control equipment.
“Setting up booths for the calibration and testing of navigation systems is a complex and costly area. That is why the results of our work will be demanded by Russian industrial enterprises developing navigation systems. We also look forward to active cooperation in this area with international companies, “ Remarks Yuri Filatov.
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Reconstruction of the image metric of periodic structures in an opto-digital angle measurement system
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