Data processing apparatus for direction finding, comprised of computer hardware, radio receiver and transmitters, and recorded computer software featuring associated signal processing and algorithms to track and locate radio frequency emitters for use in ground-based applications either team portable or in a backpack

'algorithm':24 'apparatus':3 'applic':38 'associ':20 'backpack':45 'base':37 'compris':7 'comput':9,17 'data':1 'direct':5 'either':39 'emitt':31 'featur':19 'find':6 'frequenc':30 'ground':36 'ground-bas':35 'hardwar':10 'locat':28 'portabl':41 'process':2,22 'radio':11,29 'receiv':12 'record':16 'signal':21 'softwar':18 'team':40 'track':26 'transmitt':14 'use':33

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