David E Nielson
Accountancy in Sandy, UT
License number
Utah 326270-2601
Category
Accountancy
Type
Certified Public Accountant
Address
Address
Sandy, UT
Professional information
Vor Phase Monitoring System
US Patent:
4104637, Aug 1, 1978
Filed:
Oct 27, 1976
Appl. No.:
5/735947
Inventors:
David R. Nielson - Sandy UT
Assignee:
E-Systems, Inc. - Dallas TX
International Classification:
G01S 144, H04B 106
US Classification:
343106R
Abstract:
A VOR monitoring system responds to the phase difference between two signals to determine the bearing of an aircraft with reference to a transmitting station. Even harmonic distortion interference in the monitored signals produces a bearing error and when the bearing error exceeds a preset limit the monitor of the present invention energizes an alarm. The two monitored signals are identified as a 30 Hz reference and 30 Hz variable signal, each of which is doubled in frequency to 60 Hz and divided by three to produce two 20 Hz signals. One of the 20 Hz signals is identified as a positive error signal and the second as a negative error signal. The negative error signal is phase delayed through a programmable delay by an amount related to the bearing of an aircraft with respect to a transmitting field station. The two error signals are then phase compared and the difference tested against a preset bearing error limit. When the phase difference between the two error signals exceeds the bearing error limit the alarm is energized.
David Nielson, Sandy UT - Lawyer
Address:
45 W Sego Lily Dr, Sandy, UT 84070
Jurisdiction:
Utah
Memberships:
Utah State Bar