Information on Over-the-Horizon Radar. Part 12. Missile Detection at Altitude for a Medium Distance
Abstract
It has been suggested that a limited capability hf radar might be accommodated on the existing Turkish site near Diyarbakir and that this radar could furnish useful coverage for missiles in the Lake Balkash region (1, 2 and 3). The radar location is taken as 38 degrees N 40 degrees E and the target as 46 degrees N 73 degrees E giving a great circle ground range of 1494 naut mi and forward and reverse bearings of 061 degrees and 262 degrees true. ITSA long range ionospheric data have been used with the prediction methods of ESSA Technical Report, IER 1 - NSA 2 and the radar application of such methods as is described in an NRL report (5). The operating period of 1968-1970 with an estimated average sunspot number (SSN) of 110 is examined for three months, June, September and December, being representative of summer, spring/fall and winter respectively. A frequency complement composed of narrow band channels at nominally 9, 10, 11, 12, 13, 14, 16, 18, 20, 22, 24, 27, 30 Mc has been assumed available. Target altitudes considered are 0, 50, 100 and 150 km. The signal absorbing layer has been considered slightly below 100 km. Since the radar installed on the existing site probably will not permit a full ground screen, a launch angle minimum of 4 degrees has been set. This controlling noise was taken as that given in CCIR Report #322 except that noise power was not allowed to drop below a threshold set by a median level, Nm = 148 + 12.6 In(fmc/3)db, below a watt; this noise is an estimate for the narrow band (5-10 kc) frequency complement assumed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1967
- Accession Number
- ADA472379
Entities
People
- D. L. Lucas
- E. W. Ward
- James M. Headrick
Organizations
- United States Naval Research Laboratory