A satellite found 'immense' GPS jamming, sold by the company whose new product happens to fix it (space.com)
From 500 km up, Xona says jamming was so widespread that 'as soon as we started doing any operations above Europe, we noticed something going on'. It pitches a stronger LEO signal that would shrink a jammer's reach to about 5% of today's.
A networking engineer's rebuttal was physics: whatever transmitter you bolt to a satellite, a ground jammer has no power or size budget and can simply out-shout it.
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