Accession Number : AD0830887

Title :   STUDY OF AIRBORNE MILLIMETER RADAR TECHNIQUES.

Descriptive Note : Quarterly rept. no. 6, 21 Jul-21 Oct 67,

Corporate Author : UNITED TECHNOLOGIES CORP NORWALK CT NORDEN DIV

Personal Author(s) : Chanzit, L. ; Kosowsky, L. ; Koester, K. ; Grieco, W.

Report Date : MAR 1968

Pagination or Media Count : 75

Abstract : It is shown that in the design of a moving wall antenna, both side walls must be moved in unison in a push-pull manner to maintain symmetry. If, however, one wall is made of a fine wire grating, then a number of advantages accrue; the beam may be scanned by a single wall movement, more accurate positioning results, and the structure is simple and more efficient. The problems of constructing a unique scannable Luneberg lens feed are discussed and resolved in principle. The design of a reflector surface to generate a cosecant squared antenna pattern is presented for possible application to the millimeter radar. It is shown that the shape of the spoiler is determined both by the designed beamwidth and the illumination pattern of the primary feed. Design equations of the surface are given for a typical example. Scan modulation signals based on the lobing pattern of wires and cables are investigated. For the 18-inch antenna scanning at 100 degrees per second, a 75-Hz modulation signal should be generated. Several techniques are described for sensing the modulation signal and experimental results presented. Range measurements and mapping experiments were carried out using a PPI display and the results are presented. A description of the display modifications is given together with pertinent circuit diagrams.

Descriptors :   (*RADAR, MILLIMETER WAVES), (*TERRAIN AVOIDANCE, RADAR), AIRBORNE, RADAR ANTENNAS, SLOT ANTENNAS, PHASED ARRAYS, LUNEBERG LENS ANTENNAS, ANTENNA RADIATION PATTERNS, DETECTORS, PERFORMANCE(ENGINEERING), EXTREMELY HIGH FREQUENCY, REFLECTORS, MODULATION.

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE