Accession Number : AD0650917

Title :   CATEGORY III ALTITUDE MONITOR.

Descriptive Note : Final rept.,

Corporate Author : SIERRA RESEARCH CORP BUFFALO N Y

Personal Author(s) : Theisen,Robert J.

Report Date : NOV 1965

Pagination or Media Count : 40

Abstract : The report covers the additional work on the Altitude Monitor. The objectives called for (1) simultaneous altitude readout in both 9ground station and aircraft, (2) reduction of airborne equipment weight, (3) two equipment designs, one providing airborne and ground readout for commercial aircraft, the other ground readout (only for light aircraft, (4) higher accuracy of altitude readout, and (5) go/no-go airborne indication. Results were as follows: (1) ground readout was accomplished through the addition of an airborne FSR which returns the transmitted signal 30 mc from its original frequency, (2) airborne equipment weight was reduced to less than 5-1/2 lbs., (3) airborne equipment was miniaturized for light aircraft, (4) go/no-go airborne indication was designed into the airborne computer and flight-tested, and (5) the feasibility of precise inner marker capability was demonstrated. The two major problems were (1) doppler effect and (2) false airborne triggering, presumably due to ground radar interference. It was shown that the doppler effect is overcome by increasing the receiver bandwidth to 4 kc and that false airborne triggering is eliminated through raising the modulating frequency.

Descriptors :   (*ALTIMETERS, HEIGHT FINDING), (*MARKER LIGHTS, *BEACONS), NAVIGATIONAL AIDS, DOPPLER EFFECT, AIRBORNE, ACCURACY, FLIGHT TESTING, ANTENNA RADIATION PATTERNS, COMPUTERS, MONITORS

Subject Categories : Flight Control and Instrumentation
      Air Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE