HOW IT WORKS

 

The AECAS unit uses information about the detected obstacles to find a way to avoid them. Once sensor information and steering command are received, the AECAS unit evaluates a series of parameters (e.g. safety range, steering command, speed) and computes corrections to the original command. Once added to the original command (typically done in the autopilot), these corrections allow AECAS to control the flight profile and keep the vehicle from colliding: either by holding a minimum distance to an obstacle or by slowing down.

 

schema

The schema above shows how the AECAS units work in tandem with an autopilot in order to keep the vehicle safe. The data exchanged between both is controlled by the autopilot in this sequence:

1 - The autopilot requests an output from AECAS by providing it with the user command (roll and pitch, or 'null' if there is no user command).

2 - The AECAS unit evaluates the provided user command, the two-dimensional data received from the sensor(s) and estimates the current vehicle state. Based on this information it computes the corrections (to roll and pitch) necessary to avoid a collision, and provides these corrections to the autopilot.

3 - The autopilot adds the AECAS corrections to the original user command and updates the actuators with the corrected values.

 

There are three distinct AECAS operation modes available (depends on model): EDC, ABS and HIBS.

 

EDC – Emergency Distance Control

In this operation mode, the AECAS unit uses information about obstacles around the vehicle (obstacles positions in the XY-plane of the sensor) to evaluate the user-defined safety region (characterised by the minimum acceptable distance to an obstacle). If an obstacle is detected inside this safety region, a correction to the original steering command (i.e. original roll and pitch) is computed that causes the vehicle to move away from the obstacle. This functionality is available in all AECAS unit models.

 

edc 

 

 

ABS - Active Braking Supervision

In this operation mode, the AECAS unit uses information about obstacles around the vehicle and the user command to evaluate the collision risk in the region defined by the sensor range. If a situation is detected, in which the vehicle is at risk of not being able to break in safety, AECAS will compute a correction (to roll and pitch) which causes the vehicle to break and come to a stop, and keeping obstalces outside of the user-defined safety region. If, for any reason, this safety region is not respected, the EDC mode takes control and moves the vehicle away from the obstacle. This functionality is available only on the AECAS2000 model.

 

abs_mode 

 

 

HIBS - High Performance Braking Supervision

In this operation mode, the AECAS unit uses information about obstacles to estimate the velocity of the vehicle by using a depth-based SLAM algoirthm. Using this information and information about the user command, AECAS then extrapolates the vehicle trajectory and evaluates the collision risk in the region defined by the sensor range. If a situation is detected, in which the vehicle is at risk of not being able to break in safety, AECAS will compute a correction (to roll and pitch) which causes the vehicle to break and come to a stop, and keeping obstacles outside of the user-defined safety region. If, for any reason, this safety region is not respected, the EDC mode takes control and moves the vehicle away from the obstacle. This functionality is available only on the AECAS2000 model.

 

abs_mode