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As a follow-on to this question, how do GPS receivers decide if they've successfully acquired the coarse acquisition (CA) code for a GPS satellite?

  • If it's based on post correlation SNR, what's the typical threshold? 13 dB? (I get that SNR thresholds are typically chosen based on trade-off between Pd and Pfa, but what Pd and Pfa are typically used in GPS?)

This paper, LOW POWER GLOBAL NAVIGATION SATELLITE SYSTEM (GNSS) SIGNAL DETECTION AND PROCESSING, mentions... enter image description here

"A confidence measure, referred to as ratio in this paper, can be used to decide whether to declare satellite detected or not. The ratio is the value of the highest peak divided with the next highest peak."

What's the benefit of using the ratio of the highest peak to second highest peak over a traditional SNR (highest peak to median ratio)? Is this a standard metric?

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