Investigation of efficiency of compensation medium effects in a radar

Аuthors

Ovodenko V. B.^*, Trekin V. V.^**

Science Research Institute for Long Distance Radio communication, NIIDAR, 10, build.5, 8 March str., Moscow, 127083, Russia

*e-mail: ovodenko@gmail.com
**e-mail: News197@mail.ru

Abstract

It is well-known that the Earth’s lower and upper atmosphere conditions have a significant impact on radio wave propagation. Refraction and time delay are the most important effects in relation to the Ultra High Frequency radar. The improving of the target tracking accuracy requires the accounting of atmospheric effects on the radar operation mode.

The effectiveness of the compensation medium effects on a radar operation is presented in the paper. We have developed a model for calculating atmospheric effects on the radar for its use in near real-time. This model is primarily focused on correcting the effects that are responsible for radar range and elevation angle bias error. Two ways for corrections calculation are considered. The first way is using climatological models for long-term forecast. The second way is based on the real-time updating method of the ionospheric model using slant TEC measurements for short-term forecast.

The two-dimensional ray tracing scheme is applied to calculate corrections. The corrections are provided for the radar in the form of three dimensional look-up tables with 10 min intervals. The each target measurement (range, elevation angle and azimuth) can be corrected for each radar hit.

We have performed a comparison between radar measurement and reference data of the calibration satellite position to make this evaluation. The results of comparison between real radar measurements and reference measurements showed the high efficiency of applying the operational corrections forecast.

The range error decreased by 47.6% and the elevation angle decreased by 65.4% for the long-term forecast. As for operational forecast, only the range error decreased by 82% and the elevation angle remained unchanged.

Keywords:

radar, ionosphere, ionosphere model, updating of ionosphere model, atmospheric error, total electron content

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