UVB-76

[jerico]

Solved!

Doppler Radio Sounding of the Ionosphere
[31] High-frequency Doppler method for ionosphere researches is based on observation of frequency variations of the radio wave reflected from ionosphere inhomogeneities, changing in time and in space. Thus changes of an ionosphere state can be caused by solar geophysical factors as well as by atmosphere and seismic events from natural and artificial origins. Propagation of the radio wave is accompanied by frequency deviation caused by changes in physical properties of media and in the geometric trajectory or an altitude of reflection.

[32] The high-frequency Doppler method consists in comparison between the frequency of the continuous radio signal, reflected by the ionosphere, and the frequency of the stable basic generator. Usage of the basic source enables to apply the device both for vertical and inclined sounding. The basic generator frequency is shifted on some hertz from the transmitter frequency to detect Doppler shift.

[33] The equipment resolution, or its sensitivity, depends on the frequency stability of the heterodyne receiver and carrier wave of the radio transmitter. The highly stable broadcasting radio station working in a short wave range is used as radio transmitter. The radio receiver basic generator is the quartz generator with proportional thermostat system of the resonator, providing the frequency stability about 10 -8. So the resolution of the measuring complex on frequencies about 10 MHz is provided at 0.1 Hz level. With decreasing of a radio frequency this value decreases proportionally. Main parameters of the measuring are
carrier wave frequency 4.625 MHz;
receiver resolution ~0.1 Hz.

And if you take a closer look at google maps. The thing is not blacked out on google maps. There is a cloud passing the building. If you even take a closer look at the building you see the same building to the right only pointing the other way.

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