Abstract
Introduction. The basic theoretical information on measuring systems in radar is presented, an analysis is performed to determine the errors of direction finders, and calculation expressions are found to determine the magnitude of the direction-finding errors by a single-pulse method in the Fresnel zone of a linear receiver antenna array caused by the combined action of the internal noise of the radio direction finder receiver and the angular noise of extended reflective interference. Purpose of the study. To consider the influence on the magnitude of the errors of direction finding together of the levels of the side lobes of both the differential and total directivity characteristics of the receiving antenna of the radio direction finder in the Fresnel zone. Materials and methods. Approaches for determining the magnitude of direction-finding errors are a generalization to the Fresnel zone of the known result of calculating the error during operation of a monopulse direction finder in the far zone of the receiving antenna. Results. The influence of the angular size and the distance size of a multi-point reflector on the magnitude of direction-finding errors by a single-pulse method in the Fresnel zone of a receiving linear antenna array of a radio angular system is investigated. Conclusion. Theoretical methods of measurement in radar are considered and it is shown that expanding the functionality to ensure high accuracy of measuring an information parameter will improve the accuracy of determining errors in direction finding systems.
Highlights
The basic theoretical information on measuring systems in radar is presented, an analysis is performed to determine the errors of direction finders, and calculation expressions are found to determine the magnitude of the direction-finding errors by a single-pulse method in the Fresnel zone of a linear receiver antenna array caused by the combined action of the internal noise of the radio direction finder receiver and the angular noise of extended reflective interference
In this paper consider the problem of determining the measurement errors monopulse radio direction finder angular coordinates of a point radio source in the Fresnel zone of the receiving filled LAR under the combined influence of internal noise and angular noise generated by signals of statistically independent point reflectors
General relations (34), (35), (20) allow us to calculate mean square deviation (MSD) and a bias b in estimating he angular position of a point radio source in the Fresnel zone of an LAR-filled monopulse direction finder when combined with receiver noise and angular noise caused by signals of statistically independent point reflectors
Summary
Where A 0 – complex radiation amplitude of a direction finding radio source; , R – the angular position relative to the normal to the LAR and the range of the target being detected (center of the LAR is the origin); k = 2 / ; xi = x(i – (N – 1)/2); i = 0, N – 1; x – distance between LAR elements; N – number of LAR elements;. – a value determined by the displacement of the source (m-th reflector) in range Rm relative to the reference range R0; fi, i = 0, N – 1 – real numbers defining the function of the opening of LAR;. Let’s determine the estimate of the angular displacement of the target relative to the equivalent direction (ED) 0, taking into account the real part of the complex signal (9). The complex angular coordinates of the radar reflection center, taking into account the real and imaginary parts of the complex signal (9) were considered in [14, 15]
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