A Programmable Surface Wave Ultrasonic Matched Filter.
Final rept. Nov 71-Jul 74,
RAYTHEON CO NORWOOD MASS
Pagination or Media Count:
A new spread spectrum transmission technique is described which can efficiently convey information in asynchronous bursts. Theoretical predictions are provided to establish the baseline performance of this technique for the special case where 8 data bits are transmitted in each burst. The implementation of an experimental simplex transmission system is described which makes extensive use of Surface Acoustic Wave SAW devices for signal generation and matched filter detection. The design and experimental performance is displayed for the state-of-the-art SAW devices as well as the entire simplex system. It is shown that eight SAW filters capable of generating 127 chip pseudonoise codes at a 50 MHz chip rate can be coherently combined into a single burst and also matched filter demodulated. It is further shown that discrete addressing of the transmitted bursts can be accomplished by permutation of the order of transmission of the 8 individual codes within a burst.
- Line, Surface and Bulk Acoustic Wave Devices
- Active and Passive Radar Detection and Equipment
- Radio Communications