Research into the Influence of Millimeter-Wave Antennas on Direction Finding Errors by Phase Method
https://doi.org/10.32603/1993-8985-2023-26-2-25-36
Abstract
Introduction. Direction finding errors degrade the performance of any direction finding system. In the case of a phase direction finder, the cause of errors, among other things, is related to the non-identity of the receiving channels. Research into the influence of antennas on direction finding errors, as well as a search for ways to reduce these errors, appear to be relevant tasks in terms of improving the quality of direction finding systems.
Aim. To study the influence of millimeter-wave antennas on the errors of the phase direction finder.
Materials and methods. For a series of four millimeter-wave antennas, the following characteristics were obtained: spatial gain readings, phase diagram readings, and complex reflection coefficient values. Based on the characteristics obtained for several spatial directions, matrices of characteristics were formed. For each matrix, the L norm was found. Based on the differences between the obtained L norms, conclusions were drawn about the degree of difference between the antenna characteristic matrices. According to the degree of similarity between the characteristic matrices, the antennas were grouped in pairs. The L norms of the antenna matrices from one pair differed insignificantly compared to the differences between the L norms of the antenna matrices from the second pair. With each pair of antennas, the bearing and direction-finding errors were determined in the range of angles φ: −15…15° in increments of 1°. The values of direction-finding errors obtained for each pair of antennas were compared with each other.
Results. The obtained values of direction-finding errors for two alternately used pairs of antennas differ in the entire considered range of angles. Moreover, a pair of antennas with a smaller difference L norm is characterized by a lower level of direction-finding errors. At most points in the angular range, the difference in DF errors for two pairs of antennas falls within the range of 0.05 to 0.1°. At the boundaries of the angular range, the direction-finding errors increase, with the largest difference of 0.5° being observed at an angle of ϕ = 15°.
Conclusion. Differences in the characteristics of antennas installed in the same phase-metric base lead to an increase in direction finding errors. A method for quantifying the non-identity of antennas is proposed. The proposed method can be used to group antennas in phase-metric bases, which will reduce direction-finding errors by the phase method.
About the Author
I. D. Pavlov
JSC "Central design bureau of automatics"
Russian Federation
Russian Federation
Ivan D. Pavlov, Master in "Radio Engineering" (Omsk State Technical University, 2017), Design engineer of the 2nd category. The author of 11 scientific publications. Area of expertise: electrodynamics and antenna-feeder devices.
644027, Omsk, Kosmichesky Pr., 24 A
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Review
For citations:
Pavlov I.D. Research into the Influence of Millimeter-Wave Antennas on Direction Finding Errors by Phase Method. Journal of the Russian Universities. Radioelectronics. 2023;26(2):25-36. (In Russ.) https://doi.org/10.32603/1993-8985-2023-26-2-25-36
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