M.S. Vorona1, A.A. Gusarov2, A.Y. Onufrey3

1-3 Mozhaysky Military Space Academy (Saint Petersburg, Russia)

Currently, radar stations (radars) with phased array antennas (PAA) of tracking systems for small-sized aircraft (MLA) are being developed and modernized. HEADLIGHTS make it possible to form several receiving beams of the directional pattern (DP) and provide a high throughput of the received radar information (RI). One of the key and most important for modern and future radar with phased array is the solution to the problem of ensuring optimal resolution and detection of small aircraft. Taking into account the importance of the tasks solved by information means, increasing the probability of correct detection and resolution of small aircraft (MLA) against the background of the inevitable presence of unintentional interference is an urgent task. Within the framework of the considered variant of the annular decomposition filter, it can be included in the compensating device, which simultaneously, according to preliminary target designation, gates one or more interfering signals, and in the general case, one or several useful signals. The main elements of the presented block diagram of an asymptotically optimal compensation device for the resolution-detection of PM signals are: subchannel 1: the formation of an estimate of the delay time of the interfering signal (in the general case, several interfering ones) and the formation of both the strobes for extracting the interfering signal from the received finite in time input mixture, and the strobes for extracting the pulses of the components of its decomposition in KFR; subchannel 2: sub-signal for the generation of the compensating voltage containing the receiving register, signal mixtures; restoring adder; block for normalizing the generated compensating voltage; subchannel 3: own compensation channel with a similar register, SF-subtraction block with a matched filter; an envelope detector; a threshold scheme with a controlled threshold.

The presented block diagram of the optimal compensation device for the resolution-detection of frequency-modulated signals is not quite complicated, both at the stage of its development and at the stage of tuning with the exit to an iterative process of similar compensation of several strong interfering signals. In addition, a relatively simple modification of the device is also possible, with access to an iterative process similar to the compensation of several strong interfering signals.

Vorona M.S., Gusarov A.A., Onufrey A.Y. Detection and super resolution of small space objects based on frequency-phase-modulated signals. Electromagnetic waves and electronic systems. 2021. V. 26. № 4. P. 60−66. DOI: https://doi.org/10.18127/j15604128-202105-07 (in Russian)

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