Check if the obstables are around me

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To check for obstacles within a specific radius, various technologies can be utilized, including auto-focus cameras, laser range finders, radar systems, and acoustical sensors. Each technology has its own advantages depending on the required range and application. Research papers and resources are available for further reading on these technologies. The choice of technology will depend on the specific requirements of the task at hand. Understanding these options can help in effectively detecting obstacles in the environment.
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Do you know how to check if the obstables are around me within a ,say, given radius ? Any research papers available out there for me to read? Thanks
 
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Please elaborate. Presumably one could use the technology that auto-focus cameras use, or something like a laser (or optical) range finder:
http://repairfaq.ece.drexel.edu/sam/lr/,
http://www.opticsplanet.net/201000.html, http://www.fas.org/man/dod-101/sys/ship/weaps/an-say-1.htm,

or radar (i.e. microwave) systems - http://www.offshore-technology.com/contractors/instrumentation/miros/,

or acoustical systems - http://www.robot-electronics.co.uk/htm/srf1.shtml .

The technology depends on the range.
 
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