Optical Excision Program Optical Excisor Field Tests
Abstract
A brassboard optical excisor was tested in a real-world spread spectrum intercept system with both actual and simulated signals. It was shown that the vulnerability of the spread spectrum intercept system to narrowband jammer interference was significantly reduced by the frequency selective rejection capabilities of the optical excisor. The brassboard optical excisor was assembled on a 2 x 4 foot table and had 40 megahertz of coherent bandwidth with approximately 200 resolvable frequencies. This brassboard was tested inside a van which contains 3 full racks of equipment devoted to spread spectrum intercept. Test data for a spread spectrum chip detector with and without an optical excisor were collected. This data utilized a simulated spread spectrum signal having a 10 megahertz chip rate and a negative signal-to-noise ratio combined with a simulated narrowband jammer. With optical excision, the chip detector demonstrated a 25 db improvement in narrowband jammer noise immunity with essentially no degradation in chip detector sensitivity when compared to the chip detector without optical excision. These tests also demonstrated the optical excisor's ability to coherently process broadband signals while achieving a frequency stability better than 3.3 hertz.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1982
- Accession Number
- ADA115367
Entities
People
- Dave Jackson