REDUCTION OF RANGE AMBIGUITY IN THE MADRE RADAR
Abstract
The Madre radar, a coherent, moving-targetindicating (MTI) radar which utilizes highfrequency ionospheric propagation to extend its range beyond the geometric horizon, has been used repeatedly for tracking aircraft targets at ranges as great as 2000 nautical miles and for detecting launch-phase ballistic missiles from the Atlantic and Pacific missile ranges. A method has been devised by which range ambiguity in the Madre radar may be reduced without that degradation of echo doppler coherence which results from a simple interpulse frequency-shifting method. This new method utilizes a series of double-sideband pulses, with sidebands separated by different intervals from a common suppressed carrier. These pulses are transmitted cyclically. A description of the double- sideband frequency-shifting system which has been constructed at NRL is given, and its evaluation in a study of local and over-the-horizon aircraft targets is presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 20, 1964
- Accession Number
- AD0355660
Entities
People
- J. R. Davis
- James M. Headrick
Organizations
- United States Naval Research Laboratory