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Image Transmission via Spread Spectrum Techniques
Quarterly technical rept. no. 3, 1 Oct 1973-1 Jan 1974
NAVAL UNDERSEA CENTER SAN DIEGO CA
Pagination or Media Count:
The paper addresses the design of a spread spectrum image transmission system to provide increased antijam protection to a television link from a small remotely piloted vehicle. Transform encoding and frame rate control may be used to remove the natural redundancy inherent in the image in order to permit the use of spread spectrum encoding for increased antijam protection. Emphasis is placed on the two-dimensional discrete cosine transform DCT and a hybrid DCT with differential pulse code modulation DPCM. Both the two-dimensional DCT and the hybrid DCTDPCM provide nearly the theoretically optimal performance of the Karhunen-Loeve transform, while permitting implementation by small, lightweight hardware in real-time.
APPROVED FOR PUBLIC RELEASE