Looks like they’re still looking for it. But why wasn’t as easy as just having a helicopter fly out there and tracking it while it was on its way down?
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Signal processing could be a factor. Radar signal returns are processed using computers, as no those computers will filter out signals that are deemed irrelevant to national security. A balloon has a different signature than a bomber or a cruise missile, and we’ve mainly been looking for the latter two until recently. It may take some time to develop tracking procedures for balloons and such.
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