RU92015854A - METHOD FOR DETERMINING THE DIELECTRIC PERMITTIVITY OF THE GROUND OF THE PLANET - Google Patents

Claims (1)

The method relates to planetary astrophysics and exploration geophysics, in particular to active methods for remote determination of the complex dielectric constant of subsurface layers of the planet’s soil, depending on the depth. The invention allows to extend the functionality by determining the dependence on the depth of the dielectric characteristics of the layered heterogeneous soil of the planet. To do this, when an artificial satellite of the planet (COI) moves in a circular or elliptical orbit, it additionally sequentially in time with an amplitude modulation period T _m emit harmonic signals at N - 1 frequencies f _N = ω _N / 2π that satisfy the condition f _{c N} <f _N < f _{c d} , where f _{c N} is the critical frequency of the planet’s night-time ionosphere, f _{c d} is the critical frequency of the planet’s daily ionosphere, N _{m i n} ≤ N N N _{m a x} , N _{m i n} ≥ 6 ^o C 7, N _{m a x} ≥ 15, the frequencies of consecutive signals are related by the relation f _{k + 1} = f _k + δf, k = 1, 2, 3 ... N, δf = (f _{N -} f ₁ ) / N - uniform frequency sampling step, the modulation period T _m satisfies the condition QΔt ≤ T _M <2d _s / C, where Δt ≥ 10 / f ₁ is the duration of the harmonic signal, Q = T _M / Δt is the duty cycle, Q ≥ 2 3, c = 3 10 ⁸ m / c - the speed of light in vacuum, in the intervals between the emission of two consecutive signals in N orbital regions measure the amplitudes of the signals U _i (f _N ) reflected by the daytime ionosphere, measure the delay time of the reflected signals τ _i , measure the results of the amplitudes of signals U reflected by the ground surface _S (f _n) to n portions of the orbit on the night side surface sensing f Aneta measured delay time τ _s of the reflected signal is stored measurement results, the weighing signal adopted produce U _S (f _N) in accordance with coefficients _{g N = τ s / τ i} , determine the module of the reflection coefficient R at the frequencies f _N the formula
R (f _N ) = g _N U $\genfrac{}{}{0ex}{}{\text{2}}{\text{s}}$ (f _N ) / U $\genfrac{}{}{0ex}{}{\text{2}}{\text{i}}$ (f _N ),
determine the frequency
f $\genfrac{}{}{0ex}{}{\text{min}}{\text{n}}$ , n = 1,2,3, ..., n <N,
where R as a function of frequency has a minimum of R _{m i n} and frequencies
f $\genfrac{}{}{0ex}{}{\text{max}}{\text{n}}$ , n = 1,2,3, ..., n <N,
where R as a function of frequency has maxima R _{m a x} and measures
Δf = f $\genfrac{}{}{0ex}{}{\text{max}}{\text{n}}$ -f $\genfrac{}{}{0ex}{}{\text{min}}{\text{n}}$ ,
the minima and maxima of the reflection coefficient determine the piecewise continuous distribution function of the dielectric parameters of the depth, the thickness of the upper layer of the soil.