Abstract: Sensor unit for detecting a motorized object producing a seismic or acoustic signal in the form of at least one spectral line, comprising at least one seismic sensor or at least one acoustic sensor for collecting a signal, an analog-to-digital converter for receiving said signal and generating a digital signal, a memory for storing portions of said digital signal, and a processing unit configured for performing the following operations: generating a first set of Fast Fourier Transform (FFT) values indicative of a portion of to said signal, associating said first set of FFT values with a second set of values being a partition, calculating an entropy value H of said partition, repeating the above operations, thereby constituting a sequence of entropy values H(t) corresponding to a plurality of portions of said signal, and determining a detection in case a predetermined criterion is met, said criterion is based at least on said sequence of entropy values, thereby enabling detecting of said seismic or acoustic si

Abstract: Detection of at least one object causing a signal of interest. In one embodiment, a method of detecting at least one object causing a persistent non-random pressure wave comprises: providing a digital signal representation of the pressure wave that includes respective amplitudes of the signal, in at least two different frequencies, and providing a detection indication based on a measured similarity between the respective amplitudes over time.

Abstract: A traffic monitoring system for monitoring traffic including a population of users bearing a multiplicity of mobile communication devices, and methods useful for monitoring traffic, the system including a mobile communication network interface receiving, from at least one communication network serving the multiplicity of mobile communication devices, and storing, location information characterizing at least some of the multiplicity of mobile communication devices, and a traffic monitor operative to compute at least one traffic-characterizing parameter on the basis of the location information.

Abstract: A traffic monitoring system for monitoring traffic including a population of users bearing a multiplicity of mobile communication devices, and methods useful for monitoring traffic, the system including a mobile communication network interface receiving, from at least one communication network serving the multiplicity of mobile communication devices, and storing, location information characterizing at least some of the multiplicity of mobile communication devices, and a traffic monitor operative to compute at least one traffic-characterizing parameter on the basis of the location information.

Abstract: A route guidance system, for providing individualized route guidance to from at least one and up to each one of a plurality of selected individual vehicles, which are system participants, and which are moving in at least one traffic stream of a plurality of vehicles is disclosed. Various embodiments of the system commonly include a digital cellular operator, a route guidance web server, and a central traffic light computer. In addition, each vehicle that is a system participant, is provided with means, such as a cellular phone, for transmitting and receiving information, such as vehicle position, destination, and route information, as well as with means for displaying information, such as a recommended route of travel from the vehicle's current location to its destination. Certain embodiments of the system utilize satellite-provided photographic data showing traffic density. A method of providing rout guidance to vehicles is also disclosed.