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Hello,

Currently, I was going through thereceiver architectures of navigation satellite receivers. The sensitivity of these receivers is pretty low. One of the technique is to extend coherent integration time for increasing the sensitivity.

Can anyone explain me what is the significance of it. Also, I read that "the presence of unknown navigation data bit transitions negatively effect the coherent integration process."

I am unable to understand what are these unknown navigation data bits used for?

Thanks.
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