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Better attack angle calculation. Does not get exactly right, but works for all cases.

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Need to implement a PID controller navigation type to get a correct attack angle
This commit is contained in:
Brandon Danyluk 2021-04-20 15:31:38 -06:00
parent 438cb8b90f
commit aea24c6de4
2 changed files with 20 additions and 20 deletions
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39
addons/missileguidance/functions/fnc_attackProfile_JDAM.sqf
View File

@ -20,7 +20,7 @@
params ["_seekerTargetPos", "_args", "_attackProfileStateParams", "_timestep"];
_args params ["_firedEH", "", "_flightParams", "", "", "_targetData"];
_firedEH params ["_shooter","","","","","","_projectile"];
_attackProfileStateParams params ["_gpsData", "_initialProjectileHeight", "_terminal", "_lastAngleToTarget"];
_attackProfileStateParams params ["_gpsData", "_initialProjectileHeight", "_terminal"];
_gpsData params ["", "_impactAngle", "_attackDirection"];
_targetData params ["_directionToTarget", "", "_distanceToTarget"];
_flightParams params ["_pitchRate", "_yawRate"];
@ -33,6 +33,10 @@ if (_attackDirection < 0) then {
_attackDirection = direction _projectile;
};
private _projectilePos = getPosASLVisual _projectile;
private _projectilePitch = ((vectorDir _projectile) call CBA_fnc_vect2polar) select 2;
private _targetDir = _projectilePos vectorFromTo _seekerTargetPos;
private _targetPos = _seekerTargetPos;
if !(_terminal) then {
_targetPos = [
@ -40,32 +44,29 @@ if !(_terminal) then {
_targetPos#1,
(_seekerTargetPos select 2) + 500
];
private _lineDir = [1, 180 + _attackDirection, _impactAngle] call CBA_fnc_polar2vect;
private _projectilePos = getPosASLVisual _projectile;
private _timeToGo = (_projectilePos distance _targetPos) / vectorMagnitude velocity _projectile;
private _v = _projectilePos vectorDiff _seekerTargetPos;
private _d = _v vectorDotProduct _lineDir;
private _closestPoint = _seekerTargetPos vectorAdd (_lineDir vectorMultiply _d);
private _currentPitchTowardTarget = ((_projectilePos vectorFromTo _seekerTargetPos) call CBA_fnc_vect2polar) select 2;
private _closingRate = if (_timestep != 0) then {
(_currentPitchTowardTarget - _lastAngleToTarget) / _timestep;
} else {
0
};
_attackProfileStateParams set [3, _currentPitchTowardTarget];
private _timeToGo = (_projectilePos distance _closestPoint) / vectorMagnitude velocity _projectile;
private _pitchTime = _pitchRate * _timeToGo;
private _projectileAngleFromTarget = acos ((vectorDir _projectile) vectorCos _targetDir);
private _availablePitch = _pitchRate * _timeToGo;
private _projectileElevation = ((vectorDir _projectile) call CBA_fnc_vect2polar) select 2;
private _neededPitch = (_impactAngle + _projectileElevation + _closingRate);
private _pitchOverETA = _timeToGo - ((_impactAngle + _projectileElevation) / _pitchRate);
private _neededPitch = _impactAngle + _projectilePitch;
// TODO: look into PID controller and custom navigation type to ride the line? Same as SACLOS really
private _atMinRotationAngle = _pitchTime <= _neededPitch;
_attackProfileStateParams set [2, _atMinRotationAngle];
private _atMinRotationAngle = _availablePitch <= _neededPitch;
_attackProfileStateParams set [2, (_atMinRotationAngle || (_neededPitch <= _projectileAngleFromTarget))];
if (GVAR(debug_drawGuidanceInfo)) then {
_attackProfileName = format ["JDAM [Pitch Available - %1 Needed Pitch - %2 ETP - %3]", _pitchTime, _neededPitch, _pitchOverETA];
_attackProfileName = format ["JDAM [Pitch Available - %1 Needed Pitch - %2 TTP - %3]", _availablePitch, _neededPitch, (_availablePitch - _neededPitch) / _pitchRate];
drawIcon3D ["\a3\ui_f\data\IGUI\Cfg\Cursors\selectover_ca.paa", [1,0,0,1], ASLtoAGL _closestPoint, 0.75, 0.75, 0, "P", 1, 0.025, "TahomaB"];
};
} else {
_attackProfileName = format ["JDAM [Pitch - %1 Impact Pitch - %2]", _projectilePitch, _impactAngle];
};
if (GVAR(debug_drawGuidanceInfo)) then {

1
addons/missileguidance/functions/fnc_gps_attackOnFired.sqf
View File

@ -21,4 +21,3 @@ _firedEH params ["_shooter","","","","_ammo","","_projectile"];
_attackProfileStateParams set [0, [] call FUNC(gps_getAttackData)];
_attackProfileStateParams set [1, (getPosASL _projectile) select 2];
_attackProfileStateParams set [2, false];
_attackProfileStateParams set [3, 0];