RU2018129356A - METHOD FOR SECRET MONITORING OF RADIO-SILENT OBJECTS - Google Patents

Claims (1)

The method of covert monitoring of radio-silent objects, which consists in the fact that the array of N antennas receives direct and scattered radio signals from objects of broadband transmitters of electronic systems for various purposes, synchronously converts the ensemble of radio signals received by the antennas into digital signals, digital signals are converted into direct s and scattered

signals for selected azimuthal elevation directions

which together with the value of the azimuthal elevation direction of reception are remembered, characterized in that they convert the direct signal s into single-frequency partial matrix signals of the complex phasing function A _ων , each of which includes hypothetical signals scattered by potential stationary and moving objects at one of the expected Doppler shift frequencies ω in the _νth part of the expected delay region, the partial matrix signals A _{ων are} stored and combined into a complete matrix signal of a complex phasing function and A ₀ for a zero value of the Doppler frequency shift, for each selected azimuth-elevation direction of reception, the scattered signal is converted

in the signal element of a complex time-frequency image for a zero value of the Doppler frequency shift

Where

- a Hermitian conjugate matrix with A ₀ using a signal

as an initial approximation, an auxiliary matrix signal depending on the previous solution is iteratively generated and stored

Where

- z-th component of the image element vector

k = 1, 2, ... is the iteration number, as well as the signal of the next approximation of the element of the complex time-frequency image

where λ is the Lagrange multiplier, and the scattered signal purified from direct and scattered by stationary objects signals

until the current iteration number exceeds the specified threshold K, then from the cleared signal

for each expected non-zero value of the Doppler frequency shift ω in each νth part of the expected delay region, an initial approximation signal is generated

and then iteratively receive and store the auxiliary matrix signal

and the signal of the next approach

element of the cleared complex time-frequency image until the current iteration number exceeds a predetermined threshold K, the generated signals of the elements of the cleared image are combined

into the matrix signal of the resulting complex time-frequency image

after which, according to the local maxima of the square of the module of the matrix signal of the resulting image

Where

- ωq-th component of the matrix signal of the resulting image

determine the number of scattered radio signals in the selected azimuthal elevation direction, the parameters of which are the values of the azimuthal elevation direction of reception

Doppler frequency shift ω and time delay q of each scattered radio signal - perform detection, spatial localization and tracking of objects.