Научная электронная библиотека ULRICH'S Periodicals Directory

Сибирский государственный университет
науки и технологий имени академика М.Ф. Решетнева

Сибирский аэрокосмический журнал
ISSN 2712-8970 (Print) ISSN 2782-5760 (on-line)

Сведения об образовательной организации

UDK 621.376.4
IMPEDANCE MISMATCH INFLUENCE AT INTERNAL DELAY OF NAVIGATION SIGNAL SIMULATOR CALIBRATION
N. M. Krat1, 2*, A. A. Savin2
1JSC “Academician M. F. Reshetnev “Information Satellite Systems” 52, Lenin Str., Zheleznogorsk, Krasnoyarsk region, 662972, Russian Federation 2Tomsk State University of Control Systems and Radioelectroincs 40, Lenin Av., Tomsk, 634050, Russian Federation *E-mail: kratnm@iss-reshetnev.ru
This paper is devoted to navigation signal simulator calibration. The description of uncertainty estimation of internal signal simulator delay, which is caused by impedance of measurement equipment (navigation signal simulator, analyzer and measurement cable) mismatch, is shown in the paper. The aim of research is to get expression to count uncertainty of simulator internal delay and to give its quantitative assessment. The uncertainty is caused by presence of reflected signal at the input of signal delay estimation algorithm. Reflected signal has place because input/output impedances of measurement equipment are different. The simplified mathematical model of signal at the signal delay estimation algorithm input is given. Correlation algorithm work for given model of signal has been analyzed. Two expressions for systematic uncertainty of delay estimation count have been derived and their inaccuracy has been estimated by means of modelling. The first expression is universal for all variety of navigation signals; the second is more accurate and takes into account spectral characteristics of the concrete navigation signal. The quantitative assessment of uncertainty, based on modern measurement equipment is given – at the length of measurement cable about one meter systematic uncertainty can reach 100–150 picoseconds. Conclusion was made, that at modern requirements to navigation signal simulators calibration, impedance mismatch must be taken into account. The information, mentioned in this paper, can be used at internal delay of navigation receivers’ estimation when receivers are calibrated by means of navigation signal simulator.
Keywords: navigation signal simulator, calibration, impedance mismatch, systematic uncertainty, internal delay.
References

 

1. Krivshich V. I., Krasnenko S. S., Pichkalev A. V., Shkol’nyi V. N. [Checking of the radionavigating equipment for space application]. Tezisy dokl. 2 Mezhdunar. Nauch.-tekhnich. konf. “Navigatsionnye sputnikovye sistemy, ikh rol’ i znachenie v zhizni sovremennogo cheloveka” [Proc. 2nd Int. scientific and technical conference “Navigation satellite systems: their part and significance in the life of modern man”]. 2012, P. 72–75 (In Russ.).

2. Grebennikov A. V. [Combined filtration of code and phase measurements in the high precision radio navigation equipment]. Uspekhi sovremennoi radioelektroniki. 2012, No. 9, P. 118–128 (In Russ.).

3. Grebennikov A. V., Kondrat’ev A. S., Sizasov S. V., Khazagarov Yu. G. [Equipment for the calibration and the metrological check of the sources of navigation signals GNSS]. Tezisy dokl. 2 mezhdunar. nauch.-tekhnich. konf. “Navigatsionnye sputnikovye sistemy, ikh rol’ i znachenie v zhizni sovremennogo cheloveka” [Proc. 2nd Int. scientific and technical conference “Navigation satellite systems: their part and significance in the life of modern man”]. 2012, P. 239–241 (In Russ.).

4. Elwischger B. P. B., Thoelert S., Suess M., Furthner J. Absolute calibration of dual frequency timing receivers

for Galileo. European Navigation Conference (ENC). Vienna, 2013.

5. Thoelert S., Grunert U., Denks H., Furthner J. Absolute calibration of time receivers with DLR’s GPS/Galileo HW simulator. 39th annual precise time and time interval (PTTI) meeting. P. 323–330.

6. Fischer J., Perdue L. A Calibrated Precision GNSS Simulator for Timing Applications. Proceedings of the 45th Annual Precise Time and Time Interval Systems and Applications Meeting, Washington 2013. P. 107–111.

7. Shirman Ya. D., Golikov V. N. Teoreticheskie osnovy radiolokatsii [Theoretical bases of radiolocation]. Moscow, Sovetskoe radio Publ., 1970, 560 p.

8. Levin B. R. Teoreticheskie osnovy statisticheskoi radiotekhniki [Theoretical bases of statistical radio engineering] 3rd edition, complemented and conversed]. Moscow, Radio i svyaz’ Publ., 1989, 656 p.

9. Grishin Yu. P., Ipatov V. P. et al. Radioelektronnye sistemy. [Radio engineering systems], Moscow, Akademiya Publ., 2008, 529 p.

10. Global’naya navigatsionnaya sputnikovaya sistema GLONASS. Interfeisnyi kontrol’nyi dokument. Navigatsionnyi radiosignal otkrytogo dostupa s kodovym razdeleniem v diapazone L3. Redaktsiya 1.0. [Global navigation satellite system GLONASS. Interface control document. Open service navigation signal with code division in L3 frequency band]. Moscow, 2016, Rossiyskie kosmicheskie sistemy Publ., 57 p.

11. Krat N. M., Savin A. A., Sharygin G. S. [Test equipment for autonomous navigation system of space vehicles]. Doklady TUSUR. 2014, No. 1 (31), P. 28–32 (In Russ.).

12. Spirent GSS9000 constellation simulator datasheet. Available at: https://www.spirent.com/-/media/Datasheets/ Positioning/GSS9000_Specifications.pdf (accessed: 10.05.2016).

13. Avionics GPSG-1000 GPS/Galileo Portable Positional Simulator datasheet. Available at: http://alfa-test.ru/public/catalog/files/1062_gpsg-1000iss4.pdf (accessed: 10.05.2016).

14. Agilent technologies infiniium 9000 series oscilloscopes datasheet. Available at: http://data.datasheetlib.com/pdf1/13/95/139508/n2902a_441f06e901.pdf (accessed: 10.05.2016).

15. R&S RTO digital oscilloscope specifications. Available at: https://cdn.rohde-schwarz.com/campaignsmedia/data/sota/rto/downloads/RTO_dat-sw_en_5214-5155-22_v1900.pdf (accessed: 10.05.2016).


Krat Nikita Mikhailovich – engineer, JSC “Academician M. F. Reshetnev “Information Satellite Systems”;

postgraduate student, TUSUR University. E-mail: kratnm@iss-reshetnev.ru.

Savin Alexander Alexandrovich – Cand. Sc., senior researcher, TUTSUR University. E-mail: saasavin@mail.ru.