In accordance with described examples, a method determines if a velocity of an object detected by a radar is greater than a maximum velocity by receiving on a plurality of receivers at least one frame of chirps transmitted by at least two transmitters and reflected off of the object. A velocity induced phase shift (.sub.d) in a virtual array vector S of signals received by each receiver corresponding to a sequence of chirps (frame) transmitted by each transmitter is estimated. Phases of each element of virtual array vector S are corrected using .sub.d to generate a corrected virtual array vector S.sub.c. A first Fourier transform is performed on the corrected virtual array vector S.sub.c to generate a corrected virtual array spectrum to detect a signature that indicates that the object has an absolute velocity greater than a maximum velocity.

Apparatus and methods to determine a change in atmospheric pressure between a forward portion of a flying object and a rear portion of the flying object based on at least one radio frequency (RF) return signal, and to determine a password using the determined change in atmospheric pressure.

Apparatus and methods to determine a change in atmospheric pressure between a forward portion of a flying object and a rear portion of the flying object based on at least one radio frequency (RF) return signal, and to determine a password using the determined change in atmospheric pressure.

A method and a first device for providing variables for obtaining a service at a service location, the service location including an access lane, and at least one sensor device assigned to the access lane being provided, including a step for detecting data values with the aid of the sensor device, the data values representing variables for obtaining the service as a function of at least one part of the access lane, and including a step for providing the variables represented by the data values in such a way that the variables are made accessible to a first vehicle, which is not in the at least one part of the access lane.

A method and a first device for providing variables for obtaining a service at a service location, the service location including an access lane, and at least one sensor device assigned to the access lane being provided, including a step for detecting data values with the aid of the sensor device, the data values representing variables for obtaining the service as a function of at least one part of the access lane, and including a step for providing the variables represented by the data values in such a way that the variables are made accessible to a first vehicle, which is not in the at least one part of the access lane.

The invention relates to a process for monitoring vehicles on a road by a system comprising at least one radar sensor and a second sensor different from the radar sensor, wherein the second remote sensor is a time-of-flight optical sensor or optical image sensor, the process comprising a temporal readjustment and a spatial matching in order to obtain a set of measurement points each assigned to first characteristics derived from the radar data and second characteristics derived from the optical data, the determination of the radar vehicle trackings and of the optical vehicle trackings, a comparison of similarity between the radar vehicle trackings and the optical vehicle trackings, the elimination of the radar vehicle trackings for which no optical vehicle tracking is similar, the process comprising monitoring a parameter derived from first characteristics of a retained radar vehicle tracking.

The present invention relates to a method and apparatus for passive multistatic radar detection of aerial objects using preexisting commercial broadcast transmitters and an internet-connected network of passive receivers inexpensive enough and packaged in such a way as to support deployment to nationwide scale by crowd-sourcing.

The present invention relates to a method and apparatus for passive multistatic radar detection of aerial objects using preexisting commercial broadcast transmitters and an internet-connected network of passive receivers inexpensive enough and packaged in such a way as to support deployment to nationwide scale by crowd-sourcing.

Systems and methods for coordinating and controlling vehicles, for example heavy trucks, to follow closely behind each other, or linking to form a platoon. In one aspect, on-board controllers in each vehicle interact with vehicular sensors to monitor and control, for example, gear ratios on vehicles. A front vehicle can shift a gear which, via a vehicle-to-vehicle communication link, can cause a rear vehicle to shift gears. To maintain a gap, vehicles may shift gears at various relative positions based on a grade of a road.

An object is to enable measurement of position and velocity of a measurement object. A velocity measurement device includes a transmitting means, a receiving means, and a signal processing means. The transmitting means transmits a transmission signal by a transmitting antenna toward a measurement object. The receiving means receives a reflected wave from the measurement object with multiple receiving antennas and generates a reception signal for each of the receiving antennas. The signal processing means obtains a phase plane of the reflected wave with respect to an antenna plane of the multiple receiving antennas from a phase difference between the reception signals to specify an arrival direction of the reflected wave, obtains a distance to the measurement object from a propagation delay time of the reflected wave, and calculates a phase fluctuation of the reflected wave to calculate a velocity of the measurement object from the phase fluctuation.