RU2013113030A - METHOD FOR ESTIMATING SIGNAL / NOISE RELATIONSHIP BY RESULTS OF IONOSPHERE SIGNALING WITH CHF - Google Patents

Abstract

A method for estimating the signal-to-noise ratio in the ΔF frequency band according to the LFM sounding of the ionosphere, which consists in emitting a continuous LFM signal by a transmitter having a power P and processing it in a receiver, characterized in that the received probing LFM signal is heterodinated with a converter and its preliminary filtering in the frequency range from -ΔF / 2 to ΔF / 2, using the difference frequency filter, filtering in the frequency range from -ΔF / 2 to ΔF / 2, calculate the fast Fourier transform (FFT), additional but using the interference filter, the output signal of the converter is filtered, using the equalization device, the output samples of the difference frequency filter are combined in time with the output samples of the interference filter, and then the samples from the outputs of the equalization device and the interference filter are fed to the inputs of the estimating device and the relation estimate is calculated in it signal-to-noise for the frequency of analysis and the k-th FFT output according to the formula, where K = P / P; P is the power of the transmitter emitting the connected signal; is the module of the energy spectrum of the emitted connected signal; is the module of the energy spectrum of the emitted sounding signal; is the module of the energy spectrum of the received sound signal calculated by the kth output of the FFT calculator N is the number of components in the spectrum of the emitted connected signal; f is the frequency of the m-th component in the spectrum of the emitted connected signal; P (f) is the interference power at the input of the receiver, calculated by the output voltage of the interference filter.

Claims (1)

A method for estimating the signal-to-noise ratio in the frequency band ΔF _C according to the LFM of sounding the ionosphere, which consists in emitting a continuous LFM signal by a transmitter having a power P _{prd s} and processing it in a receiver, characterized in that the received probing LFM is heterodyned with a converter the signal and its pre-filtering in the frequency range from -ΔF _pr / 2 to ΔF _pr / 2, using the difference filter, filtering in the frequency range from -ΔF _fr / 2 to ΔF _fr / 2, calculate the fast conversion Fu Rye (FFT), in addition, using the interference filter, the output signal of the converter is filtered, using the equalization device, the output samples of the difference frequency filter are combined in time with the output samples of the interference filter, and then the samples from the outputs of the equalization device and the interference filter are fed to the inputs of the estimator and it computes an estimate of the signal-to-noise ratio for the analysis frequency f _a and the k-th FFT output according to the formula $$h_k^2\left(f_a\right)=\frac{K_{PRd}}{2{\displaystyle \sum _{m=0}^{N_c-\mathrm{one}}{S}_{c0}^2\left(f_m-f_a\right)}}\frac{{\displaystyle \sum _{m=0}^{N_c-\mathrm{one}}\frac{S_{c0}^2\left(f_m-f_a\right)}{S_s^2\left(f_m\right)}{S}_{PRm}{}_{sk}^2\left(f_m\right)}}{P_P\left(f_a\right)}$$

where K _prd = P _{prd s} / P _{prd s} ; P _{prd s} - the power of the transmitter emitting a connected signal; $$S_{c0}^2\left(f\right)$$

- module of the energy spectrum of the emitted connected signal; $$S_s^2\left(f\right)$$

- module of the energy spectrum of the radiated sounding signal; $$S_{PRmsk}^2\left(f\right)$$

- module of the energy spectrum of the received sounding signal, calculated by the k-th output of the FFT computer; N _c is the number of components in the spectrum of the emitted connected signal; f _m is the frequency of the mth component in the spectrum of the emitted connected signal; P _p (f) is the interference power at the input of the receiver, calculated by the output voltage of the interference filter.