All-Weather, Low-Level Navigation.
Abstract
The results of the successful, initial flight experiments and measurements involving the tuned radio frequency receiver and the maximum likelihood phase estimator of the all-weather, low-level navigation system are given. At low level, 80 miles from the transmitter, 10 degrees (100 feet at 263 KHz) of phase resolution were obtained with received signal levels less than 0.1 microvolt. Short range (4 miles) ground based measurements showed repeatability of one degree (10 feet at 263 KHz) for high received SNR conditions. A digital flight director design has been completed and indications from simulation studies are that it will provide increased capability to minimize error off-course without gyro feedback. Work has been done on programming the SPC-12 for airborne computations. This computer will be used with the receiving components to provide for a complete flyable system. All work is now converging on the goal of providing the government with a flying model which can be operated independent of its creators. With this model the efficacy of a low-level navigation system can be further evaluated. This report also discusses techniques developed for lane counting, narrow band filtering, receiver blanking to minimize spherics effects, frequency synthesis, low-frequency-beacon phase stability measurements and man-machine system considerations. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1971
- Accession Number
- AD0720214
Entities
Organizations
- Ohio University