Space-time diversity for active antenna systems

Space-time diversity for active antenna systems

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In this chapter, different techniques for improving radar performance in detection, location and classification of targets, through simultaneous transmission of radar signals in different directions, are analysed and discussed. After a brief introduction to the benefits and limitations of wide instantaneous angular coverage, the principles of space-time coding - i.e. sending simultaneously different signals through the different subarrays of a phased-array antenna - are described and illustrated by a few examples, e.g. intra-pulse scanning, circulating pulse or interleaved scanning. Generic techniques for codes optimization are then examined and shown to open the way to space-time adaptivity. A quantitative analysis of diversity gain demonstrates the benefits of high resolution inherent to wideband space-time radar systems, and a tentative classification of space-time codings is proposed. The conclusion emphasizes the benefits to be obtained from those space-time techniques, which will become accessible in near future, taking advantage of the current evolution towards agile front-ends and smart mode management systems for future radars.

Inspec keywords: diversity reception; space-time codes; antenna phased arrays; phased array radar; optimisation

Other keywords: active antenna system; phased-array antenna; intrapulse scanning; radar performance; smart mode management systems; space-time coding; space-time diversity; codes optimization; space-time adaptivity; generic technique

Subjects: Antenna arrays; Radio links and equipment; Radar equipment, systems and applications; Optimisation techniques; Codes

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