ATC
eLoran named best backup for satnav
A study commissioned by the NGATS Institute on behalf of the FAA’s JPDO and prepared by the advanced engineering and sciences division of ITT determined th

A study commissioned by the NGATS Institute on behalf of the FAA’s JPDO and prepared by the advanced engineering and sciences division of ITT determined that eLoran (for enhanced) has “the highest overall preference rating…particularly in the U.S.” as a backup for satnav receivers in the event of failure or interference. The system is a modernized version of loran-C, where the user’s receiver–employing a GPS-like “all in view” technique–continuously tracks signals from every loran transmitter within a radius of about 2,000 miles and then selects the best of those to determine position.

The 180-page study, which had not been released at press time, analyzed DME/DME/INS; GNSS/INS; eLoran; VOR; “hardened” GNSS; terrain mapping; and multilateration.