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I was under the impression that one of the main drivers of ADS-B is to enable smaller separation between aircraft due to the more accurate position reporting. I
by lutorm 7y ago
I was under the impression that one of the main drivers of ADS-B is to enable smaller separation between aircraft due to the more accurate position reporting. If that's the case, then radar won't be a useful backup because planes would be closer than the radar can separate them.
- sokoloff 7y agoPlanes under IFR will be as close as ATC policies want to run them. If everything's working and separation standards become 2nm laterally, then when there's a GPS or ADS-B outage, we can just revert to the 5nm separation standards and use radar backup.
- lutorm 7y agoThat might be easier said than done, though, because there may not be enough space to do that. If you have the airspace packed at 2nm and then you need to revert to 5nm, all the planes will fill 2.5x as much area. Plus, how would ATC safely effect that separation when the planes are closer than resolution of the equipment.