org.opentrafficsim.road.gtu.lane.perception.categories.neighbors

Interface Estimation

All Known Implementing Classes:

Estimation.FactorEstimation

public interface Estimation

Estimation of neighbor headway, speed and acceleration.

Copyright (c) 2013-2019 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved.
BSD-style license. See OpenTrafficSim License.

Version:

$Revision$, $LastChangedDate$, by $Author$, initial version 6 apr. 2018

Author:

Alexander Verbraeck, Peter Knoppers, Wouter Schakel

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	Estimation.FactorEstimation Estimation based on a factor.

Field Summary

Fields

Modifier and Type	Field and Description
static Estimation	NONE No estimation errors.
static Estimation	OVERESTIMATION OVerestimation based on situational awareness.
static Estimation	UNDERESTIMATION Underestimation based on situational awareness.

Method Summary

Modifier and Type	Method and Description
NeighborTriplet	estimate(LaneBasedGTU perceivingGtu, LaneBasedGTU perceivedGtu, Length distance, boolean downstream, Time when) Estimate headway, speed and acceleration.
default Length	getDelayedHeadway(LaneBasedGTU perceivingGtu, LaneBasedGTU perceivedGtu, Length distance, boolean downstream, Time when) Returns a delayed headway.
default Speed	getDelayedSpeedDifference(LaneBasedGTU perceivingGtu, LaneBasedGTU perceivedGtu, Time when) Returns a delayed speed difference (other minus ego).
default Speed	getEgoSpeed(LaneBasedGTU perceivingGtu) Returns the ego speed.

Field Detail

NONE

static final Estimation NONE

No estimation errors.

UNDERESTIMATION

static final Estimation UNDERESTIMATION

Underestimation based on situational awareness.

OVERESTIMATION

static final Estimation OVERESTIMATION

OVerestimation based on situational awareness.

Method Detail

estimate

NeighborTriplet estimate(LaneBasedGTU perceivingGtu,
                         LaneBasedGTU perceivedGtu,
                         Length distance,
                         boolean downstream,
                         Time when)
                  throws ParameterException

Estimate headway, speed and acceleration.

Parameters:

perceivingGtu - LaneBasedGTU; perceiving GTU

perceivedGtu - LaneBasedGTU; perceived GTU

distance - Length; actual headway at 'now' (i.e. not at 'when' if there is a reaction time)

downstream - boolean; downstream (or upstream) neighbor

when - Time; moment of perception, reaction time included

Returns:

NeighborTriplet; perceived headway, speed and acceleration

Throws:

ParameterException - on invalid parameter value or if parameter is not available

getDelayedHeadway

default Length getDelayedHeadway(LaneBasedGTU perceivingGtu,
                                 LaneBasedGTU perceivedGtu,
                                 Length distance,
                                 boolean downstream,
                                 Time when)

Returns a delayed headway.

Parameters:

perceivingGtu - LaneBasedGTU; perceiving GTU

perceivedGtu - LaneBasedGTU; perceived GTU

distance - Length; actual headway at 'now' (i.e. not at 'when' if there is a reaction time)

downstream - boolean; downstream (or upstream) neighbor

when - Time; moment of perception, reaction time included

Returns:

Length; delayed headway

getEgoSpeed

default Speed getEgoSpeed(LaneBasedGTU perceivingGtu)

Returns the ego speed. This is the speed used in AbstractLaneBasedGTU.getCarFollowingAcceleration(), and hence this is the reference speed for the stimulus of speed difference.

Parameters:

perceivingGtu - LaneBasedGTU; perceiving GTU

Returns:

Speed; ego speed

getDelayedSpeedDifference

default Speed getDelayedSpeedDifference(LaneBasedGTU perceivingGtu,
                                        LaneBasedGTU perceivedGtu,
                                        Time when)

Returns a delayed speed difference (other minus ego).

Parameters:

perceivingGtu - LaneBasedGTU; perceiving GTU

perceivedGtu - LaneBasedGTU; perceived GTU

when - Time; moment of perception, reaction time included

Returns:

Speed; delayed speed difference (other minus ego)