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Azusa(əzo͞o`sə), city (1990 pop. 41,333), Los Angeles co., S Calif., in the San Gabriel valley; inc. 1898. It is a residential and industrial city in a citrus-fruit growing area. Its varied manufactures include aerospace and aircraft-navigation equipment, baggage-handling vehicles, industrial controls, electronic and transportation equipment, fabricated metal products, machinery, furniture, chemicals, and optical instruments. Azusa Pacific College is in the city.
A continuous-wave, high-accuracy, phase-comparison, single-station tracking system operating at C-band and giving two direction cosines and slant range which can be used to determine space position and velocity of a vehicle (usually a rocket or a missile).