The main aim of this dissertation is to contribute to the understanding of basic infrastructural technologies support to innovation activities by firms of defense industry in Brazil. Particularly, this work seeks to answer how defense firms perceive the importance of infrastructural technologies - metrology, standardization, technical regulation and conformity assessment - in their innovation cycles. The methodology comprises: (i) a literature survey to elaborate a theoretical outline to characterize the core subjects of the research: defense innovation system and defense products; sectorial systems of innovation; and infrastructural technologies; (ii) definition of the research scope; selection of the primary data source - the Brazilian Survey of Technological Innovation (Pintec), published by the Statistical Office (IBGE), and the research analytical framework; (iii) data collection and tabulation; (iv) main findings discussion; and (v) formulation of conclusions and suggestions for the next Pintec survey and for future research. The main results can be summarized as follows: (i) identification of PINTEC items directly associated with basic infrastructural technologies; (ii) identification and analysis of Brazilian defense firms perceptions about the relevance of basic infrastructural technologies in supporting their innovation strategies; and (iii) comparative analysis of patterns of response of innovative and non-innovative defense firms.