Wednesday, July 09, 2008

Cars To Form One Huge Sensor Network

Who said Wireless Sensor Networks had to be small personal area networks? According to Network World, researchers at Penn State University are developing a sensor that would be attached to cars that would allow it to talk to other cars, forming a large area sensor network.

The original concept being developed at Penn State is for the purpose of preventing car theft. It is geared towards parking lots and apartment buildings that might offer the additional anti-theft protection as an added perk. When a user parks their car, the tiny sensor would notify other cars around it that it is there and "joining the network". Periodically, the sensor will broadcast a message to other cars saying "I'm here and I'm safe". When the person unlocks their car to leave, the sensor would notify other cars in the network that it is leaving. If the car were to leave the network without issuing this "goodbye message", in the case of a theft for example, the other cars in the network would notice the car is missing and will notify the network controller to call the police.

The sensors are inexpensive and will eventually be about the size of a grain of rice, making them difficult for a would-be car thief to locate and disable. Even if they were able to tamper with the sensor, the other cars in the network would notice the missing "I'm safe" broadcasts and notify the base station that there is a problem. The wireless network approach will not only make anti-theft protection more affordable, but also more effective.

This concept is a perfect use of Wireless Sensor Technology. Why does it have to be limited to parking lots though? The biggest challenge for wireless sensors is their long term need of power. Cars have plenty of power! Why not put a sensor in every car? Think about what a selling point this could be for Ford or GM? Cars can form a huge wide area network over a large area, routing their information through other cars, until it reaches a controller strategically placed throughout the city. Now it doesn't matter if you car is in a parking lot, parked on the street, or being taken for a joy ride by some punk. A query can be sent through the network to find the exact location of the car, allowing the police to apprehend the thief in minutes.

As with most technological advances, the privacy advocates will have a field day with this one. But I personally believe the benefit would outweigh the potential for concern.

Labels: , , ,

Monday, July 07, 2008

DC Police Plan Largest Deployment of Gunshot Sensors

The Baltimore Examiner reported over the weekend that Washington DC is planning to expand its network of wireless gunshot sensors to cover more high crime neighborhoods in the city. By September of this year, police expect 16 of the city's 68 square miles to be covered by the ShotSpotter technology that pinpoints the exact locations of gunshots.

Once the network is deployed, DC will have one of the largest wireless gunshot networks in the country. According to the Washington Post, the technology has guided police to three homicides in Southeast Washington, and in one case officers got there rapidly enough to make an arrest.

Interestingly, the ShotSpotter website states that US Department of Defense has requested that they limit discussion on the how the gunshot detection technology works.

I don't know why they bother as this is no big secret. The basic idea is simple: using the arrival times of the acoustic events at different sensor locations, the shooter position can be accurately calculated using the speed of sound and the location of the sensors. Vanderbilt University was successful in using this technique to pinpoint a gunshot to an area less than 1 meter, which is supposedly more accurate than the ShotSpotter products.

Regardless of it accuracy, the ShotSpotter is an excellent example of a company that is USING the technology to solve a SPECIFIC problem. As we have mentioned here in the past, it will take a lot more APPLICATIONS of the technology before the market really takes of. It is great to see that ball starting to roll.

Labels: , ,