THE EFFECT OF LINEAR FREQUENCY MODULATION ON ANGULAR RESOLUTION AND POINTING ACCURACY,
Abstract
The effect of linearly frequency-modulated signals on angular resolution and pointing accuracy is analyzed for a linear differencing interferometer, a directive two-element (summing) array, and a frequency-modulated product array. The exact space-time response of each array is computed, and it is shown that, in the absence of noise, resolution and accuracy can be improved by making the rate of change of frequency as large as possible for as long a time as possible. The magnitude of both these quantities is limited by practical considerations, the effects of noise in both receiver and object region, and the nature and properties of the target. It is shown that, when the signal-to-clutter ratio is high enough and there are only a few targets, the product array is superior to the conventional summing array. It is also shown that frequency modulation may be employed with linear rather than product demodulation; linear demodulation decreases pointing accuracy (on a single target) and resolution capability (for incoherent targets) but eliminates the interaction of multiple targets and clutter. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1967
- Accession Number
- AD0665456
Entities
People
- G. O. Young
Organizations
- Hughes Aircraft Company