Newsgroups: sci.aeronautics.airliners Path: news From: hfunk@src.honeywell.com (Harry Funk) Subject: Re: New Scientist article X-Submission-Date: Thu, 10 Dec 1992 15:13:01 GMT References: Message-ID: Approved: kls@ohare.Chicago.COM Reply-To: hfunk@src.honeywell.com (Harry Funk) Organization: Honeywell Systems & Research Center Sender: kls@ohare.Chicago.COM X-Submission-Message-Id: <1992Dec10.151301.10339@src.honeywell.com> Date: 10 Dec 92 16:07:15 PST In article dmarble@magnus.acs.ohio-state.edu (Duane F Marble) writes: >A small point with respect to the material quoted from the New >Scientist: Global Positioning System (GPS) birds do not "observe" >anything, they just permit a ground based unit to compute it's >location. My guess is that he was referring to Automatic Dependent Surveillance (ADS) systems based on SATCOM, which has even less to to with GPS/Glonass birds. The planes [would] communicate their positions by means of a satellite link to a ground-based tracking/control system. United currently has a few 747-400's that are so equipped. The major benefit envisioned is for oceanic routes, where the fixed spacing (slots) system currently used results in suboptimal tracks for a number of users of the system. ADS is the successor to the Oceanic Display and Planning System (ODAPS), which I think is currently installed at the Oakland and NY Air Route Traffic Control Centers (ARTCCs). -- Harry A. Funk Principal Research Scientist Voice: (612)-782-7396 Honeywell Systems and Research Center FAX: (612)-782-7438 3660 Technology Dr. MS:MN65-2500 Inet: HFunk@src.honeywell.com Minneapolis, MN 55418 Bang: !srcsip!funk