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1. (WO1980001782) SYSTEMES RADAR ANTI-COLLISION POUR VEHICULES
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique
Claims
1. A system using a reflected energy signal from an
irradiated object to determine whether a moving vehicle and said object are on a collision course and to
' provide a warning of an impending collision, the system comprising:
transmitter means for irradiating said object with first and second overlapping pulsed radiant energy
beams ;
means for comparing reflected signals from the
first and second beams and for providing pulses upon detection of reflected signals from an object in both beams;
means for periodically determining from said
pulses the relative velocity and distance of said
object with respect to said vehicle;
means for storing said periodically-determined
relative velocity and distance to provide a table of relative velocity and distance values ;
means for determining ' from said stored values of relative velocity and distance whether the object is in the path of the vehicle; and
means for providing a warning signal from said
determining means at a time sufficient to prevent a
collision if said object is determined to be in the
path of the vehicle.

2. A system using reflected energy from an irradiated
object to determine whether a moving vehicle and said object are on a collision course to prevent a
collision by providing a warning signal, comprising:
means for receiving radiation signals reflected from said object;
means, responsive to the received signals
reflected by said object, for determining the
relative distance of said object with respect to said vehicle;
means for periodically determining the velocity of the object relative to the vehicle at times corresponding to a predetermined change in distance between said object and said vehicle and for storing said
relative velocity and distance at each of said times;
and
means for determining from said stored values whether said vehicle and object are on a collision
course and for providing a warning signal when said distance between said vehicle and object is less than the stopping distance of the vehicle, determined as a function of the relative velocity.

3. A vehicular radar system for automatically warning the driver of a vehicle to avoid a collision with an object, said system comprising:
pulsed transmitter means mounted on the vehicle for transmitting an electromagnetic signal in the path of motion in the vehicle;
means for receiving signals reflected from an object;
range-gating means, responsive to the received signals, for detecting the presence of an object in each of a plurality of adjacent range gate intervals extending in the path of motion of the vehicle, and for producing a like plurality of range gate signals, each representative of the presence or absence of an object in an associated range gate interval; and
processing means, responsive to the range gate signals, for detecting the presence of an object in the path of motion of the vehicle; including:
means for identifying a detected object in a -range gate interval and for associating range gate pulses produced by an identified object with that object as it moves from one range gate interval to another range gate interval;
means, cooperative with the means for
identifying, for determining and storing the relative distance and relative velocity with respect to the vehicle of an identified object as it moves from one range gate interval to another;
means for determining whether the stored relative velocities of an object are invariant; and
means for determining an alarm range gate interval at which to provide an alarm signal as a function of the relative velocity and for providing an alarm if the stored relative velocities are invariant at the time a detected object enters the alarm range gate interval.

4. A collision avoidance system for detecting an impending collision between a moving vehicle and an object, comprising:
means for producing clock pulses as the vehicle moves such that each clock pulse represents movement of the vehicle by a substantially predetermined
distance;
transmitter means responsive to the clock pulses for periodically transmitting an electromagnetic
signal in the path of motion of the vehicle;
receiving means, responsive to echoes produced by reflection of the transmitted signal by objects in the path of motion, for providing an output signal representative of the relative distances of such
objects from the vehicle;
means, responsive to the receiving means output signal, for detecting the presence or absence of
objects in each of a first plurality of range gate intervals located in the path of motion of the vehicle and adjacent to one another and for producing a
similar first plurality of range gate signals, each associated with a respective one of the range gate intervals and representative of the presence or
absence of an object in the associated range gate interval;
means responsive to the range gate signals and to the clock pulses for storing the number of clock pulses produced while an object is in a range gate
interval for each range gate interval in which the
object is detected;
means, responsive to the stored numbers of clock pulses, for determining and storing the relative
velocities with respect to the vehicle of a detected
object as the detected object proceeds through
successive range gate intervals ; and
means , responsive to the stored relative velocities for discriminating between objects which are in the
path of motion of the vehicle and objects which are
outside the path of motion of the vehicle and for
producing a signal representative thereof.

5. The system of claim 4 wherein the discriminating means comprises;
means for storing data representative of the
number of clock pulses produced during each range
gate interval by objects laterally displaced from the path of motion by varying distances as such objects
proceed through each of the range gates;
means, responsive to the clock pulses and the
stored numbers of clock pulses, for determining the
relative velocity between the vehicle and the detected object and for determining a threshold distance, based on the relative velocity, at which action must be
taken to prevent collision between the vehicle and
the detected object; and
means for comparing the stored numbers of clock pulses with the stored data and for producing a
warning signal in response to stored numbers of
clock pulses which do not match the stored data
representative of laterally displaced objects by the time that the distance between the vehicle and the object becomes less than said threshold distance.

6. For use with a vehicle of the type having a pulsed radar which periodically transmits a signal in the
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means for defining a first plurality of successive range gate intervals in time representative of a
similar first plurality of adjacent ranges extending in the path of motion of the vehicle, and including means responsive to the radar output signal for providing a first plurality of range gate signals, each corresponding to a respective range and each indicative of the presence or absence of an object in the corres-ponding range in the path of the vehicle;
means for providing system pulses at a rate
proportional to the speed of the vehicle;
means, responsive to the system pulses and to the range gate signals, for determining the number of
system pulses produced while a detected object is in each range- and for storing- said number of each range passed through by the detected object;
means for comparing the stored numbers of pulses with data representative of pulse counts produced by objects in front of the vehicle and laterally displaced from the path of the vehicle to determine if the
variation in the stored numbers of pulses is a
variation which would be produced by an object
laterally displaced from the path of the vehicle, and for producing an output signal representative thereof; and
means, responsive to the comparing means output signal for providing a warning signal when a detected object is not determined to be laterally displaced from the path of the vehicle by the time that the
distance between a detected object and the vehicle becomes less than a predetermined threshold distance.

7. The system of claim 6 wherein the threshold distance is determined as a function of the relative velocity between the detected object and the vehicle.

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