Here's what Leo writes down for the portable sensor package:
Smoke isn't much of a problem. Have a number of infared LEDs into a few small lamps, and use an infared camera to build up an image. Have them be deployable, so you can take the little lamps and cameras out of the box and put them where you want coverage.
To further coverage, use a blacklight emitter. This will probably have to be flourescent, as it's cheaper to make blacklights like that. Include a UV camera as well.
That should take care of smoke and darkness. I'm afraid there's no real way to see in darkness without a lamp of some kind, depending on it's range.
Radar is a bit more tricky, as with the longer-wavelength light, you need larger pickups to handle them. Most of the box would have to be the emitter for the radar system, with a pair of long, telescopic rods and amplifiers to act as the pickups. These would be networked together to provide directional coverage. It would be directional, but it should be more than sufficient. Accuracy would be limited somewhat by putting them on people, instead of a fixed stand, but it would be better than nothing.. and a collapsable stand should be included, so you can set it up properly. It would also help if you are using it to penetrate walls.
So, in short, make a box around a radar emitter and a collapsable stand for the recievers. Let the recievers be a pair of telescopic rods with amplifiers. It could be attached to a frame or carried by a person, but with limited accuracy due to the somewhat irregular movement of a person. It should be, at reasonable power levels, capable of detecting objects on the other side of narrow walls.
This box should include two IR lamps, as well as at least one IR camera. It should also include two UV lamps, and a UV camera.
Pickups from the cameras can be handled as normal, but the radar needs a fair amount of processing power behind it to make useful returns, so it'll need a small computer and something to display it's readout on. The radar will also be directional.
Audio isn't really useful. Bullets and lasers travel faster than sound, after all, and pointing a directional microphone requires you to know what direction it's coming from so you can point it in the right way. Things would be different underwater, but making a sonar box similar to the radar box isn't too hard, if that should become necessary.
As for power consumption, the whole thing should be able to run for about an hour on two or three of the laser rifle batteries.