MIMO radars or is it smart antennas?

Tapan K. Sarkar, Magdalena Salazar Palma

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Radars were originally designed as detectors of targets. The goal was to transmit a signal with the maximum available power and then observe whether the received signal contained a portion of the transmitted signal. A matched filter was then designed using the transmitted waveform to detect the received signal and based on some statistical hypothesis testing a decision was made on whether a target is present or absent. However, when multiple targets are to be examined or one wants to search for a low observable near a large target, the conventional detection based radar processing is not adequate. A need for finding small targets in the presence of clutter and jammer evolved into an estimation theory problem rather than detection. It is illustrated that use of a phased array in a SIMO mode can perform quite well as one does not have to worry about the inhomogenity of the clutter associated with multiple transmissions in a MIMO system as the processing becomes quite complicated. Also, the compensation of mutual coupling becomes difficult in a practical deployment on a moving platform. It is important to note that one can still exploit the advantages of super-resolution processing using estimation theory keeping the advantages of a single high power transmitting antenna in a phased array deployment. This paper illustrates such a methodology which has been in the published literature for at least a decade and compares it with the recent MIMO developments. Examples are presented related to a single snapshot based least squares methodology that can cancel interferer in the main beam using a phased array radar but performing a deterministic processing using the same number of degrees of freedom as a multisnapshot case for coherent processing.

Original languageEnglish (US)
Title of host publication2010 IEEE International Conference on Wireless Information Technology and Systems, ICWITS 2010
DOIs
StatePublished - Dec 6 2010
Event2010 IEEE International Conference on Wireless Information Technology and Systems, ICWITS 2010 - Honolulu, HI, United States
Duration: Aug 28 2010Sep 3 2010

Publication series

Name2010 IEEE International Conference on Wireless Information Technology and Systems, ICWITS 2010

Other

Other2010 IEEE International Conference on Wireless Information Technology and Systems, ICWITS 2010
CountryUnited States
CityHonolulu, HI
Period8/28/109/3/10

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Information Systems

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    Sarkar, T. K., & Palma, M. S. (2010). MIMO radars or is it smart antennas? In 2010 IEEE International Conference on Wireless Information Technology and Systems, ICWITS 2010 [5611988] (2010 IEEE International Conference on Wireless Information Technology and Systems, ICWITS 2010). https://doi.org/10.1109/ICWITS.2010.5611988