Intellectual angle sensor for antenna systems and its metrological analysis

: pp. 126-131
Ternopil Ivan Pul'uj National Technical University
Ternopil Ivan Puliui State National Technical University
Ternopil Ivan Puliui State National Technical University

The design and electron-optical scheme of intelligent opto-electronic sensor of absolute angular position are proposed. The sensor is completed by microconverter for data processing to implement the detection and compensation a number of errors that caused by mechanical nodes of rotating mechanisms. The principle of the operation of proposed angle sensor are based on themethod of determining the absolute angular position using a code disk with one track. Pseudorandom code sequence of track is composed of different widths sectors. The code reading and processing is realised by means of two single-line photo-matrices located at the ends of the chord of the disk. The code sequence is constructed so that any fragment of sectorswhen projected on photo-matrix is unique and occurs only once in passing the code sequence on the disk. To accurately determine the angular position the algorithm of the sub-pixel processing image is used. It allows determine the distance to the edges of the sectorswith resolution ability higher than half of the pixel width, that is equal of 2 micrometer. The resolution ability in the angle determination by sensor is increased to 16 bits. Due to the sensor design features, such as usage of two opto-electronic channels and software implementation of algorithms for processing information from photo-lines, errors caused by mechanical nodes of sensor via disk offset and eccentricity are minimized. Measuring at the proposed scheme also avoids the influence of random displacement sensor axis due to backlash in the bearings. The resolution ability of the designed sensor is 20 arcseconds. Based on simulation results and experimental studies metrological analysis of sensor and evaluation of error sources are given. Intelligent sensor in design and functionality was designing for the usage in control systems in particular in the pointing and tracking the antenna of the space communication systems with a narrow directional diagram.

1. Фрайден Дж. Современные датчики: справочник / Дж. Фрайден. – М. : Техносфера, 2005. – 592 с.

2. Белянский П. В. Управление наземными антеннами и радителескопами [Текст] / П. В. Белянский, Б. Г. Сергеев – М.: Сов. радио, 1980. – 280 с.

3. Palamar M. Smart Station for Data Reception of the Earth Remote Sensing [Text] // Remote Sensing - Advanced Techniques and Platforms. – Rijeka. : InTechBook, 2012. – Ch.15. – P. 341–371.

4. Denić D. High-Resolution Pseudorandom Encoder with Parallel Code Reading / Denić D., I. Ranđelović, M. Rančić. // Electronics and Electrical Engineering. – 2004. – № 7(56). –
P. 14–18.

5. Pat. GB2430818, United Kingdom, IPC H03M1/30. Optical encoder indicating rotational and nonrotational movement / Cheah Chiang Sun, Yeoh Chin Heong, Tai Li Chong; applicant: Avago Technologies ECBU IP (Singapore) Pte. Ltd; appl. 29.09.2006; publ. 04.04.2007. – 26 p.

6. Absolute position code and position measuring device [Text]: WIPO pat. WO2010049222: IPC6 G01D5/249; G01D5/347 / Lingk Christoph; applicant Dr Johannes Heidenhain GmBH; Lingk
Christoph; appl. 23.09.2009; publ. 06.05.2010. – 42 p. 

7. Пат. 57750 Україна, МПК (2011.1) G01B11/26, G01D 5/00. Спосіб визначення зміщення осі кодового диска абсолютного оптоелектронного давача кута / Чайковський А. В., Паламар М. І.; заявник і патентовласник Тернопільський національний технічний університет ім. І. Пулюя. – u201010225; заявл. 19.08.2010; опубл. 10.03.11, Бюл. № 5.

8. Canny J. F. Finding Edges and Lines in Images / Canny J. F. – Cambridge : MIT, 1983. – 146 p.

9. Lei Y. Subpixel Edge Detection Based on Morphological Theory / Lei Y., Jiafa N. // World Congress on Engineering and Computer Science 2008 WCECS, Oct. 22-24 2008, 2008. – DOI:

10. Чайковський А. В. Порівняльний аналіз ефективності методів локалізації перепадів інтенсивності в задачах вимірювання кута / А. В. Чайковський // Вісник Черкаського державного
технологічного університету. – 2013. – № 1. – С. 87–91.