Abstract
A signal information satellite is a satellite that estimates the location of a signal source on the earth and identifies the type of signal based on the collected signals. These signal information satellites are less accurate than image information satellites, but they have important implications as surveillance and reconnaissance assets. This paper covers the technological trends of signal information satellites from the Cold War era to the present. In addition, this paper shows the advantages and disadvantages of low earth orbit (LEO) satellite-based signal information collection compared to geostationary orbit (GEO) satellite-based signal information collection.
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