问题背景：想利用三轴加速度传感器转换出角度，但是按照网上的算法转换出来的角度精度很差。
想解决的问题：提高测量的精确度
double temp1, temp2;
#define ANGLE_FACTOR (57.2957) /* 弧度转换为角度的系数 */
#define CHANGE_VALUE 0.980
void GetAngleValue(void)
{
ax1 = GetAccX();
ay1 = GetAccY();
az1 = GetAccZ();
if (ax == 0)
{
ax = -1;
}
if (ay == 0)
{
ay = -1;
}
if (az == 0)
{
az = -1;
}
ax = (double)(CHANGE_VALUE * (double)ax1);
ay = (double)(CHANGE_VALUE * (double)ay1);
az = (double)(CHANGE_VALUE * (double)az1);
/*参考轴 x*/
temp1 = (double)sqrt(ay*ay+az*az);
//temp2 = atan2((double)ax, (double)temp1);
g_angle.x = (s16)(10*(atan2((double)ax, (double)temp1)) * ANGLE_FACTOR);
/* 产品水平方向（与传感器在pcb上的方向强相关）Y */
temp1 = (double)sqrt(ax*ax+az*az);
//temp2 = atan2((double)ay, (double)temp1);
g_angle.y = (s16)(10*(atan2((double)ay, (double)temp1)) * ANGLE_FACTOR);
/* 产品垂直方向（与传感器在pcb上的方向强相关）Z */
temp1 = (double)sqrt(ax*ax+ay*ay);
//temp2 = atan2((double)az, (double)temp1);
g_angle.z = (s16)(10*(atan2((double)temp1, (double)az)) * ANGLE_FACTOR);
if (g_angle.z > 900)
{
g_angle.z -= 1800;
}
g_angle.isUpdata = SET;
}
