Reglas de acentuación2 ficha interactiva topworksheets A robust, standalone 6-Axis (Gyroscope + Accelerometer) Attitude and Heading Reference System (AHRS) implementation. This library provides two algorithms: the original Madgwick-based fusion and an advanced Extended Kalman Filter (EKF) with adaptive filtering for challenging environments. Products Of Facebook
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├── optimized_mcu/ # MCU-optimized version (C-style) │ ├── Fusion_AHRS.h │ └── Fusion_AHRS.cpp ├── readable_cpp/ # Modern C++ version (better readability) │ ├── Fusion_AHRS.hpp │ └── Fusion_AHRS.cpp └── EKF_Version/ # Extended Kalman Filter with adaptive features ├── Fusion_AHRS.h # Base AHRS (same as optimized_mcu) ├── Fusion_AHRS.cpp ├── Tactical_Fusion.h └── Tactical_Fusion.cpp # Advanced EKF implementation | Directory | Description | Best For |
|---|---|---|
optimized_mcu/ | C-style, highly optimized | Embedded systems (STM32, ESP32) |
readable_cpp/ | Modern C++17, OOP | Desktop, simulation, learning |
EKF_Version/ | EKF + adaptive filtering | High-precision, impact-prone applications |
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$q = [q_0, q_1, q_2, q_3]$ is the quaternion -
$\omega = [0, \omega_x, \omega_y, \omega_z]$ is the angular velocity -
$\beta$ is the gain parameter -
$\nabla f$ is the gradient of the objective function
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$f_d = 2(q_1q_3 - q_0q_2) - d_x$ (direction cosine matrix error) -
$f_g = 2(q_0q_1 + q_2q_3) - d_y$ (gyroscope error) -
$\lambda$ balances the two constraints
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$q$ : attitude quaternion -
$b$ : gyroscope bias (rad/s)
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if (accDelta > accThreshold || gyroDelta > gyroThreshold) { impactDetected = true; }- Immediately reduce accelerometer weight to ignore false readings during impact
- Ramp up gain during recovery for fast convergence
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| Parameter | Default | Description |
|---|---|---|
impactAccThreshold | 0.5g | Acceleration change threshold |
impactGyroThreshold | 100°/s | Gyro rate change threshold |
impactRecoveryDuration | 0.5s | Recovery time |
accWeightImpact | 5% | Weight during impact |
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| Parameter | Default | Description |
|---|---|---|
linearAccThreshold | 0.15g | Deviation threshold |
linearMotionDecay | 0.95 | State decay rate |
accCompensationEnabled | 1 | Feature toggle |
#include "Fusion_AHRS.h" FusionAhrs ahrs; FusionOffset offset; void main() { FusionAhrsInitialise(&ahrs); FusionOffsetInitialise(&offset, 100); // 100 Hz while (1) { FusionVector gyro = {gx, gy, gz}; // deg/s FusionVector acc = {ax, ay, az}; // g // Gyroscope bias correction gyro = FusionOffsetUpdate(&offset, gyro); // Update AHRS FusionAhrsUpdate(&ahrs, gyro, acc, 0.01f); // Get result FusionQuaternion q = FusionAhrsGetQuaternion(&ahrs); FusionEuler euler = FusionQuaternionToEuler(q); } }#include "Tactical_Fusion.h" TacticalSystem sys; void main() { Tactical_Init(&sys, 100.0f, 0.1f); // 100 Hz, 0.1 Hz heave cutoff while (1) { FusionVector gyro = {gx, gy, gz}; // deg/s FusionVector acc = {ax, ay, az}; // g Tactical_Update(&sys, gyro, acc); FusionQuaternion q = sys.quaternion; } }| Parameter | Default | Range | Description |
|---|---|---|---|
gain | 0.5 | 0-1 | Algorithm gain |
beta | 0.1 | 0-1 | Gradient descent rate |
gyroscopeRange | 2000°/s | - | Gyro range limit |
accelerationRejection | 30° | - | Accel rejection threshold |
| Parameter | Default | Description |
|---|---|---|
processNoiseAngle | 1e-5 | Angle process noise |
processNoiseBias | 1e-7 | Bias process noise |
measureNoiseAcc | 1e-2 | Accel measurement noise |
accStaticThreshold | 0.02g | Static detection threshold |
gyroStaticThreshold | 0.5°/s | Static gyro threshold |
| Feature | Madgwick | EKF (Tactical) |
|---|---|---|
| Algorithm | Gradient Descent | Extended Kalman Filter |
| Complexity | Low | Medium |
| Accuracy | Good | Excellent |
| Impact Recovery | Basic | Advanced |
| Linear Motion Filter | No | Yes |
| Heave Estimation | No | Yes |
| MCU Friendly | ✅ | ✅ |
| Mode | Convergence | Static Noise |
|---|---|---|
| GD ON (default) | ⚡ Very Fast | 🔊 Slightly Higher |
| GD OFF | 🚗 Fast | 🔇 Minimal |
| Motion State | Behavior |
|---|---|
| Static | High accel weight, ZUPT for bias correction |
| Linear Motion | Reduced accel weight, rely on gyro |
| Impact | Minimal accel weight, fast recovery |
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