rangefinding/object detection

[sciguy125]

I'm working on a project that requires rangefinding. I was wondering what people's experiences have been with ultrasonics and IR range finders.

The problem is that I need to be able to detect a wide range of objects over a large field of view. The range doesn't need to be more than a few feet (6' or 7' might be enough), but it does have to be able to detect narrow objects (maybe an upright broom stick, picking up a chainlink fence would be awesome). Essentially, I need to be able to detect objects that I might encounter while walking down the street. Resolution doesn't have to be that great either, a foot or so is probably fine.

My main concern is the field of view. I suspect that ultrasonics can pick up narrow objects, but only near the center. I also have a feeling that the IR sensors have a very narrow field. Ideally, I'd have 360 degrees, but I might be able to settle for 180. Multiple sensors can be an option, provided that they aren't too expensive, or too bulky.

Sorry I can't be more specific, but I can't talk about the project too much at this stage.