SDK OCTAVA

The multifunctional mathematical and software complex «OCTAVA» is intended for GNSS observation processing and functions in the MatLab (Matrix Laboratory) programming support environment. It is a research variant (prototype) of the future production version and at the present stage of development it may be considered and used as Software Development Kit – SDK.

The developed domestic software complex (SW) «OCTAVA» has got no analogs in Ukraine, it is a unique scientific and technical product of many year development and research of the creative group of the authors. The given complex allowed carrying out a number of actual scientific and practical researches in the area of development of new effective methods and algorithms of high precision GNSS positioning. It is a scientific and practical basic tool. The elements of the complex are also may be used together with other software products, for example, for the purpose of organization of centers of GNSS measurement continuous processing. The developed technologies of dual-frequency and single-frequency centimeter accuracy GNSS positioning are competitive, comparable by the main features with the best foreign analogs and in part of single-frequency positioning – exceed the foreign analogs in class of software products for post-session processing.

At the present moment the SW «OCTAVA» is destined for post-session information processing, however, it may be elaborated and adapted to real time functioning.

Testing of the SW «OCTAVA» capacities was carried out by use of a great number of observations obtained in different conditions of measuring using the receivers of different developers (for example, Trіmble 4000SSІ, Trіmble 4700, Trіmble 5700, Trіmble NETR5, Ashtech ZXІІ, Ashtech PF500, NovAtel OEM 4-G2W, NovAtel DL-V3, Septentrіo PolaRx2, TPS NETG3, Leica GRX1200GG, Leica GX1230GG, Leica GR-10 and others).

In the process of numerous experiments and testing it is determined that the developed technologies of observation processing (methods, algorithms and software) assumed as a basis of the SW «OCTAVA» have got the following features.

  1. The characteristics of the developed technology of dual-frequency differential positioning are adequate to the characteristics of the well-known software products of similar purpose.
  2. The technology of single-frequency differential and relative GPS positioning (including «Moving Base» mode) allows carrying out on baselines up to 10-15 km the static and kinematic positioning that is comparable by accuracy with dual-frequency solutions. At that time the carrier-phase ambiguity resolution is carried out reliably on the intervals ~4-6 min in static geodetic survey mode and ~10-15 min in kinematic survey mode. It is expected (based on the foreign experience) that in case of using several satellite systems (for example, GPS+GLONASS) the characteristics of the given technology will be improved considerably. The important applications of such technology are different tasks of artificial constructions and natural object movements monitoring.
  3. By single-frequency network positioning in the static mode of survey in the area of coverage of networks with baselines up to ~200 km at user distance from the nearest station of the network up to ~100 km the error values (RMS) of positioning make up less than 1 cm in the horizontal plane and ~1-2 cm in vertical direction.
  4. By single-frequency network positioning in the kinematic mode of survey in the area of coverage of networks with baselines up to ~200 km at user distance from the nearest station of the network up to ~100 km the error values (RMS) of positioning make up ~3-4 cm in the horizontal plane and ~5-6 cm in vertical direction. In the area of coverage of networks with baselines up to ~100 km at user distance from the nearest station of the network up to ~50 km the error values (RMS) of positioning make up ~1-2 cm in the horizontal plane and ~3-4 cm in vertical direction.
  5. Comparison of results of the network kinematic single-frequency positioning by use of the SW «OCTAVA» and the features of the network dual-frequency RTK positioning technologies (VRS, MAC, FKP) has shown that the developed technology (post-processing mode) is highly competitive by accuracy with the mentioned dual-frequency RTK technologies.