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The article is quite informative. It is a summary of "a paper published in the journal Scientia Sinica Information" which appears to be Discussion on the requirements and feasibility of constructing China's near-Earth asteroids radar system. While it is written in Chinese the tables and figures alone are very informative. They are going for a "...


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The basic idea behind interferometry is that of interference, the combination of two waves (in this case the electromagnetic waves from distant sources). Interference inherently implies two signals to interfere with each other, and that is why the pairs of telescopes (also referred to as baselines) are important. The interference pattern between the ...


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Nature of the variation in signal strength From the paper Unprecedented variability of Sgr A* in NIR mentioned in Bit Chaser's comment, Do et al. record enormous variability in the strength of emissions from SGR A* in the NIR (Near InfraRed) band typically described at about 215 THz to 400 THz. Here is a figure from their paper: Here we see enormous ...


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Yes, we can do radio astronomy with heterogeneous, geographically distributed antennas. The VLBI is an excellent example. Of course, the antennas have to be similar in some ways for it to work: If the antennas are ground based, they need to be in the same hemisphere, or the Earth will prevent them from looking at the same target at the same time. They ...


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