evaluated to support future decisions regarding SPS operational modes and additional allocation requirements during World Administrative Radio Conference (WARC) 79 and 80 proceedings. Interference-induced degradation analyses will include trade-off of bandwidth and modulation rates. The noise modulated spectral distribution and chirp time modulation that will be examined are functionally indicated in Fig. 4.4. The limited experience with radar systems having independent search and track modes, and time multiplexed communication links indicates the general trends in particular perfor- mance-S/l ratio characteristics for out-of-channel large interferer situations plotted in Fig. 4.5. Relationships of similar form have been derived for communications synchronization delay and loss probabilities, and signal acquisition delays; and radar false target probabilities and tracking error distributions. For track-while-scan (TWS) radar systems (computer controlled phased array configurations), only performance predictions by computer modeling presently exist. A more complex functional scoring procedure is required because of the interdependencies of the detection, identification, and tracking functions; including the effects of the processing software. Computer components and systems and electro-optical sensors are expected to have a degradation characteristic similar in form to that displayed for radars and communications receivers. Induced noise (band limited continuous and cross modulated periodic components), detection/identi- fication thresholds and spatial discrimination (forms of modulation transfer function descriptors) will depend quantitatively on effective coupling
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