V.P. Likhachev1, Hong Phu Nguyen2

1,2 MTSC Air Forces «MAA named professor N.E. Zhukovsky and Y.A. Gagarin» (Voronezh, Russia)

The difference-rangefinder method (DRM) is successfully used by ground-based radio monitoring complexes to determine the current coordinates of air sources of radio emissions (SRE), including radiation from onboard radars with synthesized aperture (SAR). The disadvantage of the difference-rangefinder method is the need to use at least three receivers located at a considerable distance from each other. In addition, when using linear-frequency-modulated signals (LFM) in SAR, broadband data transmission channels are required.

The paper considers a variant of the implementation of this method for determining the coordinates of a moving source of linear-frequency-modulated signals by one means of radio monitoring with three receiving antennas. It is proposed to process the SAR signals with an autocorrelation receiver (AR), which is invariant to the value of the Doppler frequency of the received signals, and to estimate the relative delay of signals from imaginary receiving points (IRP). In this case, «signals of IRP» are understood as sounding signals of the radar, re-reflected by natural or anthropogenic objects on the ground, to which additional receiving antennas are directed.

When deriving the dependence of the signal-to-noise ratio at the output of the AR, the bistatic effective scattering area of the IRP is taken into account. Taking into account the geometric factor of the main and two imaginary receiving positions, an expression of the potential accuracy of estimating the coordinates of the source of LFM signals is obtained.

The effectiveness of the proposed method is investigated on the basis of simulation modeling. The accuracy of estimating the coordinates of the SAR air carrier at ranges less than 40 km ranged from tens of meters to units of kilometers. The results of the work can be used to expand the scope of the difference-rangefinder method for determining the coordinates of moving SRE.

Likhachev V.P., Nguyen Hong Phu Determination of the coordinates of the radio emission source of linear-frequency-modulated signals by a single-position difference-rangefinder method. Achievements of modern radioelectronics. 2022. V. 76. № 1. P. 59–68. DOI: https://doi.org/ 10.18127/j20700784-202201-05 [in Russian]

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