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more accuracy for smoothness factor at low values

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This commit is contained in:
Harry Kalogirou 2020-04-27 15:31:54 +03:00
parent 6e2de5685f
commit 52daaa789e
1 changed files with 7 additions and 3 deletions
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10
src/main/navigation/navigation_fixedwing.c
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@ -137,7 +137,10 @@ static void updateAltitudeVelocityAndPitchController_FW(timeDelta_t deltaMicros)
// PID controller to translate energy balance error [J] into pitch angle [decideg]
float targetPitchAngle = navPidApply3(&posControl.pids.fw_alt, demSEB, estSEB, US2S(deltaMicros), minDiveDeciDeg, maxClimbDeciDeg, 0, pitchGainInv);
const float cutoff_freq = constrain((10.f - navConfig()->fw.control_smoothness) / 5.0, 0.5, 2.0); // Pitch cutoff set to 1/5 the roll cutoff
// Apply low-pass filter to prevent rapid correction cutoff_freq = 0.002 * (10.0-x)^3 + epsilon
// Pitch cutoff set to 1/5 the roll cutoff
uint16_t smoothness = 10 - navConfig()->fw.control_smoothness;
float cutoff_freq = 0.002f * (float)(smoothness*smoothness*smoothness) + 0.1f;
targetPitchAngle = pt1FilterApply4(&velzFilterState, targetPitchAngle, cutoff_freq, US2S(deltaMicros));
// Reconstrain pitch angle ( >0 - climb, <0 - dive)
@ -368,8 +371,9 @@ static void updatePositionHeadingController_FW(timeUs_t currentTimeUs, timeDelta
DEGREES_TO_CENTIDEGREES(navConfig()->fw.max_bank_angle),
pidFlags);
// Apply low-pass filter to prevent rapid correction
uint8_t cutoff_freq = constrain(10 - navConfig()->fw.control_smoothness, 1, 10);
// Apply low-pass filter to prevent rapid correction cutoff_freq = 0.01 * (10.0-x)^3 + epsilon
uint16_t smoothness = 10 - navConfig()->fw.control_smoothness;
float cutoff_freq = 0.01f * (float)(smoothness*smoothness*smoothness) + 0.1f;
rollAdjustment = pt1FilterApply4(&fwPosControllerCorrectionFilterState, rollAdjustment, cutoff_freq, US2S(deltaMicros));
// Convert rollAdjustment to decidegrees (rcAdjustment holds decidegrees)