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Dear,

Here is the first draft of the Statenents of Work and Cost. My secretary put this onIstationary because I forgot to mention to her that I was dictating for another party-

would like to pitch to jwhen he visits late in September. That might be worthwhile if you have a rather complete understanding of how he will address the scaling problem I mentioned and have an opportunity to dry run his presentation. Perhaps such a careful exposure would be good for the project's viability.

See you soon. Stay well and happy.

Sincerely.

August 30, 1973

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Perform psychophyslological experiments using different kinds of electric fish in restricted water so as to estimate their ability to identify the exiszence of foreign objects in this water taking into account electrical dis. continuities imposed by the boundaries of that water and -the foreign objects placed within it. Specifically, consider the natural fish as a signal generator and receptor and then use of auxiliary signals which replicate the fishes signals and other signals of specific interest. Compute the expected behavior of such fish in open ocean or fresh waters given typical boundary conditions with respect to depth, topology, inogeneity of the water, temperature, and so forth. Summarize these findings in teras of the prospective ability of these fish to identify foreign objects in a harbor or other natural body of water of interest...foreign objects such as small submarines, torpedoes, scuba divers skin divers, and so forth.

More expliçitly, determi:e the sensory capability of 4.
individual electric fish in terms of their ability to'serse
the existence of foreign objects as a function of range,
fundamental area, volumetric displacenent, differential
discontinuity, and so fcrth. In this regard, use a tank of

0

PHASE I

ESTINATING THE EFFECTIVENESS OF ELECTRIC FISH IN DETECTING FOREIGI OBJECTS AT A OISTANCE

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water adjusted to the temperature and electrolytic conditions of presumed operational conditioas. Retain a fish near one point and insert in the vater various objects, discerning the different behavior of the fish as these objects are inserted concurrently monitoring the electrical field wichin the water. From these results, calculate the estimated behavior of such a fish in detecting an object in an infinite water domain and large scale waters with various boundary conditions.

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DETERMINING THE METHODS USED BY ELECTRIC FISH FOR RANGING AND LOCATIOH

Perfarm detailed experiments wherein the particular characteristics of electric fish are related to their abilities with respect to ranging and location. Particular attention will be focused upon the use of phased arrays of receptors, the fish's ability to determaine incremental time lags in the signal, the estimated spectral.properties of the signal, to modify the transmitted signal as a reflection of knowledge gained from previous receptions, and so forth. Interpret these findings in terms of specific schematics and data analysis required to synthesize models of the fish's capability, models which wren reified would provide signal advantage over the state of the art with respect to such a target as described above.

PHASE II

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DESIGN OF EQUIPHEIT SYSTENS SUITACLE FOR REPLICATING ELECTRIC FISH IN TERMS OF TARGETING FOREIGH OBSECTS

PHASE 1II

. Design, fabricate and test experin≥ntal apparatus suitable for replicating the above referenced models. Perform experinents with this apparatus so as ts improve its ability in various regards. Make a specific conparison of this capability to that of an electric fish and estimate the utility of such an apparatus in terms of operational situations.

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PHASE I - \$

6 months

PHASE II - \$

1 year

PHASE III - S