FIELD: radio engineering, communication.
SUBSTANCE: method comprises measuring the propagation time of electromagnetic waves to the surface and the ice layer and comparing the amplitude and phase of spectral components of the differential frequency signal, corresponding to the upper and lower surfaces, taking into account the thickness of the ice layer and attenuation of the electromagnetic waves. The difference in attenuation coefficients of electromagnetic waves in the ice layers on different water bodies is taken into account via preliminary calibration of the device, which is carried out with a fixed starting position of the carrier of the device and presence of water under the ice, by selecting a frequency-dependent function of converting the differential frequency signal in the device, until amplitudes of peaks of the spectrum of the differential frequency signal, which correspond to reflection of the electromagnetic waves from the upper and lower surfaces of the ice, are equal. The number of discrete readings of the frequency and the differential frequency signal is discretely reduced in proportion to the measured ice thickness while maintaining a fixed modulation frequency range. The device which carries out the method is based on a radio range finder. The device is characterised by a controlled frequency-dependent function of converting the differential frequency signal and presence of a device for receiving a reference signal.
EFFECT: reduced error in measuring ice thickness and improved reliability of determining properties of the medium under ice while simultaneously cutting the time spent determining ice thickness and increasing the allowable speed of moving on ice.
23 cl, 8 dwg
