Relative Bearing

STK Premium (Air) or STK Enterprise
You can obtain the necessary licenses for this tutorial by contacting AGI Support at support@agi.com or 1-800-924-7244.

Capabilities Covered

This lesson covers the following STK Capabilities:

Aviator Pro

Problem Statement

The Relative Bearing strategy is a horizontal plane strategy in which the aircraft flies to a constant relative bearing to a stationary or moving object.

Field	Description
Target	Select an object in the scenario that the aircraft will target during the maneuver.
Pos/Vel Strategies	Position and velocity strategies for the target object. The following strategies are available: NoisyBrgRng - A noisy bearing and range strategy. NoisySurfTgtPosVel - A strategy that periodically generates noisy position, speed, and course updates for a constant altitude target.
Tgt Pos/Vel Resolution	The frequency of sampling of the target object's position and velocity; interpolation of the object's position will be performed between sample points. The lowest recommended value for this property is 0.1 sec, but the lowest possible value is 0.001 sec. At the lowest value, STK's Aviator capability will use the native position and velocity of the target object; this can result in dramatically slow performance when the target object is another Aviator aircraft, since STK is performing double integration calculations in such a case.
Rel Bearing	The bearing relative to the target that the aircraft will achieve and maintain.
Minimum Range	The range from the target at which the aircraft will stop employing its guidance strategy.

Control Limits

Select a method to define the control limits (which constrain performance) of the aircraft during the maneuver.

Table - Control Limit Methods

Field	Description
Use Accel Perf Model	Use the control limits specified in the current acceleration performance model.
Specify Min Turn Radius	The minimum radius of a turn arc that the aircraft can perform.
Specify Max Turn Rate	The maximum rate at which the aircraft can turn.
Specify Max Horiz Accel	The maximum acceleration, in the horizontal plane, that the aircraft can achieve.

If the angle rate between the aircraft and the target object exceeds the aircraft's turning rate at any point during the maneuver, then the procedure will stop. If you suspect that this is the reason that a Relative Bearing maneuver is stopping prematurely, try selecting the Specify Max Turn Rate control limit and applying a high value to see if the maneuver can then run to completion.