B. G. Tatarsky1, Najjar Tammam2
1 JSC «Concern «Vega» (Moscow, Russia)
1, 2 Moscow Aviation Institute (National Research University) (Moscow, Russia)

1 info@radiotec.ru

The purpose of the article is to consider the influence of the accuracy of measuring the rotation parameters of the routing receiving antenna and observation conditions on the formation of 3D radar images using a distributed radar consisting of a rotating receiver, and a fixed stationary transceiver antenna. The article provides a detailed mathematical description of the process of calculating the standard deviation of the height measurement of the observed terrain depending on the next parameters: the slant range, the height of the radar carrier, the radius of rotation of the phase center of the receiving antenna, the vertical distance between the plane of rotation of the phase center of the receiving antenna and the phase center of the transceiver antenna, the phase of the signal at the output of the interferometer, and the angular position of the phase center for the receiving antenna.

The impact of errors has been evaluated using mathematical modeling. The presented modeling results show that errors in measuring the rotation parameters and observation conditions lead to errors in the reconstruction of the topography of the observed area. In particular, errors in estimating the signal phase at the interferometer output have been studied; the results showed that the errors in estimating the height of the studied points on the Earth's surface can reach 1 m with signal-to-noise ratio (SNR) of 20 dB and more than 10 m at 5 dB. In addition, with a SNR of 5 dB, it has been observed a distortion of the reconstructed terrain and violation of its contrast.

In this case, the standard deviation of the measurement of relief height significantly depends on the angular position of the phase center of the receiving antenna. In this regard, to ensure a minimum error in estimating the height of the earth's surface using the interferometric system implemented by a stationary transceiver module and the circularly rotating receiving module, it is necessary to correctly choose the time corresponding to the angle of rotation of the phase center receiving antenna.

Tatarsky B.G., Najjar Tammam. Influence of parameter measurement errors on the three-dimensional radar image forming in a distributed radar consisting of a rotating receiving and stationary transmit-receive modules. Antennas. 2024. № 2. P. 12–22. DOI: https://doi.org/10.18127/j03209601-202402-02 (in Russian)

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