C++ Alpha Beta Filter Class

Two other classes - GPS and Satellite are already done, found here: http://www.codesend.com/view/179480fd293f7da3a314e80c20cadde6/ Stuck on the alpha beta filter class, pasted below. Only use the given functions and parameters. Comments include what each must do. No consutructors are used (only default). Thanks

#include

class AlphaBetaFilter

{

public:

void setAlphaBeta(double a, double b);

void inializeState(double x, double y, double vx, double vy);

void update(double dt, double x, double y)

std::pair getState();

};

void AlphaBetaFilter::setAlphaBeta(double a, double b);

{

//sets the alpha and beta members of the class to a and b respectively

}

void AlphaBetaFilter::inializeState(double x, double y, double vx, double vy);

{

//sets the x and and y position and velocity to the input values

}

void AlphaBetaFilter::update(double dt, double x, double y)

{

/* uses the input time differential dt and input signals x and y to

*update the state of the filter.

*this is done by doing the following:

*i. update the xpos and ypos by adding in their respective

* velocities multiplied by the time differential.

*ii. compute a new double named r, and set it equal to x -

* xpos.

*iii. update xpos by adding into it alpha multiplied by r.

*iv. update xvel by adding into it beta multiplied by r divided by

* dt.

*v. recompute r, set it equal to y - ypos

*vi. update ypos by adding into it alpha multiplied by r.

*vii. update yvel by adding into it beta multiplied by r divided by

* dt.

*/

}

std::pair AlphaBetaFilter::getState()

{

/* uses the input time differential dt and input signals x and y to

update the state of the filter.

we will simply: return {xpos, ypos}; to construct a new std::pair

object with the necessary parameters */

return {xpos, ypos};

}