FM-CW Ranging Multipath Investigation for Navy VTOL Aircraft.
Abstract
Evaluation of the range error caused by multipath in a FM-CW range measuring system has been accomplished analytically and experimentally. Tests show that the modulation index-frequency product will have to be significantly increased and the multipath signal levels suppressed by narrow-beam tracking antennas or by use of circularly polarized antennas to achieve 1-foot ranging accuracy in a severe multipath environment. Circular polarization provides a significant improvement against single reflection multipath signals from metal surfaces. Multipath tests show that the FM-CW equipment range accuracy is severely degraded in a strong multipath signal environment but that increasing the modulation index can provide an improvement. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1976
- Accession Number
- ADA027190
Entities
People
- B. H. Humpherys
- F. E. Morris
- S. K. Miyashiro
Organizations
- Naval Information Warfare Systems Command