Nonquantized Frequency-Modulated Altimeter
- 1 June 1954
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Transactions of the IRE Professional Group on Aeronautical and Navigational Electronics
- Vol. ANE-1 (2) , 15-21
- https://doi.org/10.1109/TPGAE.1954.5062386
Abstract
A new principle that makes possible nonquantized altitude information so that the accurate range of altimeters can be extended to include low-level operation is described. A frequency shifter is inserted between the local oscillator and the mixer in order to remove the inherent error in conventional altimeters that makes them objectionable for low-altitude operation. The authors show how the characteristic of the amplifier can be shaped diferently and point out that the strength of the return signal and the inherent amplitude modulation determine the most suitable characteristic for any particular operating condition.Keywords
This publication has 3 references indexed in Scilit:
- The low-frequency problem in the design of microwave gyrators and associated elementsIEEE Transactions on Antennas and Propagation, 1956
- Correlation of the Faraday and Kerr Magneto-Optical Effects in Transmission-Line TermsProceedings of the IRE, 1952
- An Adjustable Wave-Guide Phase ChangerProceedings of the IRE, 1947