It's in the planning stage with the big boys ... Otherwise MLS (Microwave Landing System) was going to be the standard 'landing aid' to replace ILS ... Disclaimer: I did some field work and testing with TI on an MLS development system in the mid 70's. Jim ----- Original Message ----- From: "Tan Chun Chiek" To: Sent: Tuesday, June 18, 2002 9:08 PM Subject: [PIC]: Autopilot landing system for model aircraft > Hi, > This idea of an autopilot landing system just popped up in my mind, and > other details came almost immediately. I thought why hasn't anyone done it > before? The runway is something like 10m X 50m. GPS is used for > longitudinal/latitudinal positioning and preferably velocity measurement, > the aircraft would have a GPS receiver onboard, and 2 other GPS receivers > would sit on the both long ends at center of the runway, it's something akin > to differential GPS to provide better accuracy. Height measurement is done > by a ultrasonic transceiver or maybe GPS, are they accurate enough? And > pitch and roll is sensed by a pizeo gyroscope. > > How feasible is this concept? > > Regards, > Tan CC > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.