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Home Aerospace & Aeronautics Ratio of the confidence bounds of the object coordinates determined using the CMM (CMM) and the LSM (LSM)

Ratio of the confidence bounds of the object coordinates determined using the CMM (εCMM) and the LSM (εLSM)

Description

In spite of the rapid advancement of space science, the state of the art accuracy of determination of the position and velocity of both ground and space objects is still inadequate for a number of important applications such as navigation, earth remote sensing, cartography, oceanography, etc. The proposed technology (Zhechev, M., Sheptun, A. and Mashtak, I., International Aerospace Congress 2003, 2004) is based on a new method of statistical manipulation of measurement data arrays – the consistent measurements method (CMM). It places very lenient and easy-to-verify requirements upon measurement errors, thus making it possible to determine the state of both ground and space objects to much higher accuracy (in comparison with existing technologies).

Innovative Aspect and Main Advantages

The technology is based on a "know-how". The main advantages of the proposed technology are as follows:

  • Higher position/velocity measurement accuracy due to a radically new methodology of measurement data array processing, which allows one to considerably reduce the confidence interval of the sought-for parameters, this advantage becoming more pronounced as the measurement array size (N) increases (see the graph).
  • Adequate solution to the problem of carrier phase ambiguity without recourse to any extra facilities.
  • The form and parameters of the measurement error distribution law need not be known a priori, as distinct from conventional measurement data processing methods (for example, the least-squares method (LSM)).
  • Simplicity and visualization capability, which offer higher efficiency of planning and measurement data reduction.

Areas of Application

The area of application of this technology is a wide variety of identification problems, in particular:

  • Determination of the position and velocity of ground and space objects from navigation data.
  • Determination of the state of various mechanical, physical, biological and other objects from measurement data.

Determination of the state of a ground object from navigation satellite data
Fig. 1 Determination of the state of a ground object from navigation satellite data

Ratio of the confidence bounds
Fig. 2 Ratio of the confidence bounds of the object coordinates determined
using the CMM (εCMM) and the LSM (εLSM)

Stage of Development

The technology has been tested to determine the orbit of an operational spacecraft from the data measured by a ground station. Work is currently under way on determining spacecraft orbit from navigation satellite data (Galileo, GPS, etc.)

Contact Details

Institute of Technical Mechanics of NASU and NSAU.
Contact person: M.M. Zhechev, D.Sc.
Address: 15, Leshko-Popelya str., 49005, Dnepropetrovsk, Ukraine.
Phone: +38 (0562) 47 24 55.
Fax: +38 (0562) 47 34 13.
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

State Design Office "Yuzhnoye", National Space Agency of Ukraine.
Contact person: A.D. Sheptun, Ph.D.
Address: 3 Krivorozhskaya St., Dniepropetrovsk 49008, Ukraine.
Phone: +38 (0562) 92 50 77.
Fax: +38 (0562) 92 50 77.
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

92 50 77.
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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