Radar altimeter (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Radar altimeter" in English language version.

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2americanradiohistory.com

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2storage.googleapis.com

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1web.archive.org

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americanradiohistory.com

Bell 1948, p. 18. "Historic Firsts: Radio Altimeter" (PDF). Bell Labs: 18–19. January 1948.
Bell 1948, p. 19. "Historic Firsts: Radio Altimeter" (PDF). Bell Labs: 18–19. January 1948.

archive.org

Middleton, W E Knowles (1981). Radar Development in Canada: The Radio Branch of the National Research Council. Wilfrid Laurier University Press. p. 96. ISBN 9780889201064.

doi.org

Espenschied & Newhouse 1939, pp. 225–227. Espenschied, Lloyd; Newhouse, Russell (January 1939). "A Terrain Clearance Indicator". The Bell System Technical Journal. 18 (1): 222–234. doi:10.1002/j.1538-7305.1939.tb00813.x.
Espenschied & Newhouse 1939, p. 227. Espenschied, Lloyd; Newhouse, Russell (January 1939). "A Terrain Clearance Indicator". The Bell System Technical Journal. 18 (1): 222–234. doi:10.1002/j.1538-7305.1939.tb00813.x.
Colin 1967, p. 737. Colin, Robert (July 1967). "1967 Pioneer Award: Lloyd Espenschied and Russell C. Newhouse". IEEE Transactions on Aerospace and Electronic Systems. AES-3 (4): 736–742. doi:10.1109/TAES.1967.5408855.
Colin 1967, p. 741. Colin, Robert (July 1967). "1967 Pioneer Award: Lloyd Espenschied and Russell C. Newhouse". IEEE Transactions on Aerospace and Electronic Systems. AES-3 (4): 736–742. doi:10.1109/TAES.1967.5408855.
Espenschied & Newhouse 1939, p. 224. Espenschied, Lloyd; Newhouse, Russell (January 1939). "A Terrain Clearance Indicator". The Bell System Technical Journal. 18 (1): 222–234. doi:10.1002/j.1538-7305.1939.tb00813.x.
Colin 1967, p. 742. Colin, Robert (July 1967). "1967 Pioneer Award: Lloyd Espenschied and Russell C. Newhouse". IEEE Transactions on Aerospace and Electronic Systems. AES-3 (4): 736–742. doi:10.1109/TAES.1967.5408855.
Espenschied & Newhouse 1939, p. 232. Espenschied, Lloyd; Newhouse, Russell (January 1939). "A Terrain Clearance Indicator". The Bell System Technical Journal. 18 (1): 222–234. doi:10.1002/j.1538-7305.1939.tb00813.x.

eeweb.com

Cody Miller. "A Radio Altimeter for Landing UAVs or Small Aircraft" Archived 2014-02-04 at the Wayback Machine. 2010.

fcc.gov

apps.fcc.gov

"COMMENTS OF AVIATION SPECTRUM RESOURCES, INC.". p. 3, p. 8.

itu.int

"RECOMMENDATION ITU-R RS.1624 (PDF)" (PDF).

storage.googleapis.com

patentimages.storage.googleapis.com

US Expired 1517549, Lloyd Espenschied, "Railway Signal System", issued 1924-12-02
US Expired 2045071, Lloyd Espenschied, "Altimeter for aircraft", issued 1936-06-23

web.archive.org

Cody Miller. "A Radio Altimeter for Landing UAVs or Small Aircraft" Archived 2014-02-04 at the Wayback Machine. 2010.