1. System for controlling the in situ orientation of a vehicle headlamp equipped with a light source that is fixed to a mobile reflector, which comprises:
a camera that is fixed to the mobile reflector and connected to an image processing unit for processing of at least one image of the road scene;
means for determining, from said processed image or images, a measured horizon line of the road scene;
means for comparing this measured horizon line with a predetermined setpoint horizon line and determining a distance between the measured horizon line and the setpoint horizon line; and
means for adjusting the orientation of the headlamp so that the distance between the measured horizon line and the setpoint horizon line tends towards zero.
2. Control system according to claim 1, wherein the camera is mounted at one end of the reflector.
3. Control system according to claim 1, wherein the camera is an infrared camera.
4. Control system according to claim 1, which comprises a light line generator.
5. Vehicle headlamp comprising a mobile reflector that is actuated by a motor and a light source that is fixed to the reflector, wherein the in situ orientation of the headlamp is controlled by the control system according to claim 1.
6. Method of controlling the in situ orientation of a vehicle headlamp, comprising the following operations:
recording of images of a road scene in front of the vehicle,
processing of at least one image of the road scene,
determination, from said processed image or images, of a measured horizon line of the road scene,
comparison of this measured horizon line with a predetermined setpoint horizon line and determination of a distance between the measured horizon line and the setpoint horizon line,
adjustment of the orientation of the headlamp so that the distance between the measured horizon line and the setpoint line tends towards zero.
7. Control method according to claim 6, wherein the image processing operation consists in processing at least two images in order to deduce therefrom a processed image.
8. Control method according to claim 7, wherein the operation of processing two images consists in subtracting one image from the other.
9. Control method according to claim 8, wherein the operation of processing two images consists in carrying out a thresholding on the image obtained after subtraction.
10. Control method according to claim 6, wherein the operation of determining a measured horizon line consists in determining vanishing lines in the processed image and in deducing therefrom the horizon line.
11. Control method according to claim 6, wherein the setpoint horizon line is determined from the vanishing lines in a processed image, during initial adjustment of the headlamps.
12. Control method according to claim 6, wherein the distance between the measured horizon line and the setpoint horizon line corresponds to a number of frames of the camera.
13. Control method according to claim 6, wherein the setpoint horizon line is extrapolated as a function of the vanishing lines.
14. Control method according to claim 6, wherein light lines are emitted by the headlamp, forming, on the processed image, segments of vanishing lines.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A wireless network comprising:
at least one base station;
a plurality of assigned terminals for exchanging user data and control data; wherein the at least one base station is configured to (1) have a predetermined time interval for detection of a signaling sequence, wherein the predetermined time interval is based on a start time of a signaling sequence for a terminal, transmission channel properties, and autocorrelation properties of the signaling sequences of the terminals (2) transmit a start time of at least one signaling sequence of at least one terminal, (3) detect a signaling sequence using the predetermined time interval (4) correlate a received signaling sequence, and (5) detect a pulse evolved from a received correlated signaling sequence and wherein
a terminal is configured to generate a signaling sequence by folding two code sequences.
2. The wireless network as claimed in claim 1, wherein a first code sequence is a Barker sequence having 13 time intervals and a second code sequence is a Gold sequence having 256 time intervals.
3. The wireless network as claimed in claim 1, wherein a first base station includes two series-connected matched filters or one matched filter and one mismatched filter connected downstream of the matched filter for generating at least one pulse after a signaling sequence comprising two convoluted code sequences has been received and includes a peak detector and the peak detector is arranged for detecting at least a pulse assigned to a terminal during a specific detection window whose start time and duration are determined by the channel properties and the start time of a signaling sequence.
4. The wireless network as claimed in claim 1, wherein the transmission channel properties include an estimate of propagation delay and a delay spread characteristic based on multipath propagation.
5. The wireless network as claimed in claim 1, wherein a first base station includes two different matched filters for generating respective pulses after a first or a second signaling sequence is received.