Using delta phase measurements in the global navigation satellite systems receivers for machine control applications

Аuthors

Nikitin D. P.^*, Gerko S. A.^**

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: DNikitin@topcon.com
**e-mail: S.Gerko@mail.ru

Abstract

Purpose

This paper provides a reader with an overview of modern methods for improving the characteristics of navigation solutions for some machine control tasks by using the pseudo-phase measurements in the global navigation satellite systems (GNSS).

Design/methodology/approach

The development of the algorithms for navigation data processing is based on the filtering of primary estimated receiver position. It allows one to perform machine control tasks when an unexpected change of GNSS receiver operating mode takes place.
Performing a relative coordinate determination for a moving object one has to take into account unexpected difficult conditions, e.g. a small number of visible satellites. The proposed approach to overcome such difficulties consists in the processing of delta phase measurements formed at different time intervals.

Findings

The processing of delta pseudo-phase measurements showed the relevance of phase measurements for machine and aircraft control tasks by means of GNSS. Proposed methods used in the combined filtering and initial position estimates of a navigation receiver will processed in one filter with delta pseudo-phase measurements. As a result this filtering procedure leads to the improvement of the positioning accuracy (in the RMS sense) in the case of an accidental change of the operating mode of a navigation receiver.
The discussed algorithm for evaluation of the relative coordinates of moving objects can increase the probability of the correct ambiguity resolution of pseudo-phase measurements in 3-5 times in comparison with the known algorithm RTK when a receiver has 4-6 satellites in view. This will increase the reliability of the estimates of the coordinates.
Thus, the safety level of aircraft movement could be increased by usage of systems based on the GNSS or integration with GNSS systems.

Originality/value

The application of advanced methods for improving the performance of navigation solutions can significantly increase the user value of navigation equipment. The developed methods is planned to expand the functionality of navigation receivers in industry, e.g., in the controlling of construction, agricultural, mining and manufacturing equipment, and in both automatic and semi-automatic aircraft control.

Keywords:

GNSS, GPS, GLONASS, delta pseudophase, RTK, Stand Alone, DGPS, Kalman filter, ambiguity resolution, machines control

References

1. Perov A.I., Kharisov V.N. GLONASS. Printsipy postroeniya i funktsionirovaniya (GLONASS. Principles of construction and functioning), Moscow, Radiotekhnika, 2010, 800 p.
2. Kaplan D. Understanding GPS: principles and applications, Published by the Artech House, Inc. 685 Canton Street, Norwood, 1996, MA 02062.
3. Milyutin D.S., Nikitin D.P., Veitsel A.V. Vestnik Moskovskogo aviatsionnogo instituta, 2009, vol. 16, no. 6, pp. 120-124.
4. Zhodzishsky M.I. Apparatura vysokotochnogo pozitsionirovaniya po signalam globalnykh navigatsionnykh sputnikovykh system (Equipment of high-precision positioning by signals of global navigation satellite systems), Moscow, MAI-PRINT, 2010, 292 p.
5. Zhodzishsky M.I., Veitsel V.A., Zinoviev A. Patent US 2007/0052583 A1, 2007.
6. Nikitin D.P., Veitsel A.V. Informatsionno-izmeritelnye i upravlyayushchie sistemy, 2011, no. 8, pp. 56-63.
7. Gerko S.A. Vestnik Moskovskogo aviatsionnogo instituta, 2011, vol. 18, no. 4, pp. 87-92.
8. Gerko S.A. Algoritmy opredeleniya otnositelnykh koordinat podvizhnykh ob''ektov po izmereniyam psevdofaz i ikh prirashcheniyam v GNSS (Algorithms of relative coordinates determination for moving objects on measurements with use pseudophase and their increments in GNSS), PhD thesis, Moscow, MAI, 2012, 159 p.
9. Markov S.S., Sorokina I.A., Povalyaev A.A. Teoreticheskii i prikladnoi nauchno-tekhnicheskii zhurnal «Mekhatronika, Avtomatizatsiya, Upravlenie», 2007, no. 5, pp. 18-21.
10. Zhodzishsky M.I., Veitsel V.A., Zinoviev A. Patent US 7,439,908 B1 10/2008.
11. Ford, John Thomas. Patent US 6,664,923 12/2003, NovAtel, Inc.
    
12. Nikitin D.P. Telekommunikatsii, 2012, no. 6, pp.8-33.
    
13. Zhodzishsky M.I., Veitsel V.A., Veitsel A.V., Nikitin D.P., Veitsel V.V. Patent US Patent pending, application number 13838.0245 2/17/2012.
14. Solovev Yu.A. Sputnikovaya navigatsiya i ee prilozheniya (Satellite navigation and its applications), Moscow, EkoTrend, 2003, 326 p.
    
15. Shatrov O. Zarubezhnoe voennoe obozrenie, 2012, no. 5, pp. 59-63.