METHOD FOR RADAR MEASUREMENT OF CLOUD AND PRECIPITATION PARTICLE CHARGE Russian patent published in 2013 - IPC G01S13/95 

FIELD: radio engineering, communication.

SUBSTANCE: in the disclosed method, the region of the atmosphere under investigation is simultaneously irradiated with an electromagnetic wave with wavelength λ₁, which is not damped during propagation in the investigated medium, and a wave with length λ₂, which is damped; reflected electromagnetic signals from two volumes lying within the investigated region are received; power of the electromagnetic signals reflected from the first and second volumes, as well as phase shift between said signals are measured separately and the measurement results are used to determine the cloud and precipitation particle charge of the investigated region using the formula:

$$\rho =K\cdot \frac{1}{{\lambda }_2\cdot (R_2-R_1)}\cdot \frac{lg(\raisebox{1ex}{$u_{pd}$}\!\left/ \!\raisebox{-1ex}{$U_0$}\right.)}{lg\left[cos(\frac{2\pi \text{}(R_2-R_1)}{{\lambda }_2})\right]}\cdot \Delta ,\left(1\right)$$

where $$K=\frac{m\cdot c}{60\cdot e}=2,84\cdot 10^{-5}\frac{Cl}{m}$$ is a constant; m is electron mass; e is electron charge; c is the propagation speed of the electromagnetic wave; R₁ and R₂ denote distance to the two volumes lying within the investigated region; U_pd is the complex voltage at the output of the phase detector; U₀ is the amplitude of voltage at the output of the amplitude limiter; $$\Delta =\left[ln{(\frac{P({\lambda }_1)}{P({\lambda }_2)})}_{R_1}-ln{(\frac{P({\lambda }_1)}{P({\lambda }_2)})}_{R_2}\right]$$ is the difference of logarithms of the ratio of the power values of the reflected radar signal from two regions of the investigated space lying at distance R₁ and R₂ from the radar, respectively; P(λ₁) is the power of the reflected signal with length of the undamped wave of λ₁; P(λ₂) is the power of the reflected signal with wavelength of λ₂, which is damped in the investigated volume of the cloud or precipitation.

EFFECT: longer range and reduced dependency of charge measurement results on the state of the atmosphere.

1 dwg