ALPHA

This command allows the ZY to be updated regarding the orientation of the laser ranger hardware mount on a given monument[8].

Mnemonic:

ALPHA allows the adjustment of the $\alpha$ orientation angles of the laser mount.

Syntax:

ALPHA [ $<\alpha_{1}, \alpha_{2}, \alpha_{3}>$]

$\alpha_{1}$: This is the angle between north and the ranger $\hat{z}$ vector, rotating about the ranger's $\hat{y}$ vector.

$\alpha_{2}$: This is the angle of rotation about the ranger's $\hat{z}$ vector.

$\alpha_{3}$: This is the angle of rotation about the ranger's $\hat{x}$ vector.

Return values:

Success:

ALPHA 1, $\alpha_{1}$, $\alpha_{2}$, $\alpha_{3}$

Failure:

ALPHA 0, err_msg

$\alpha_{1}, \alpha_{2}, \alpha_{3}$: See description under Syntax.

err_msg: Should the command fail, this value will be an error message string, explaining the cause of failure.

Remarks:

The command ALPHA must be called with valid $\alpha_{1}, \alpha_{2}$, and $\alpha_{3}$ angles, or the ZY will be unable to point with any accuracy[8]. Ideally, this command should be executed as part of the ZY initialization.

Example:

     send: ALPHA 3.14159, 0.0033, 0.0002
  receive: ALPHA 1, 3.14159, 0.0033, 0.0002

     send: ALPHA
  receive: ALPHA 1, 3.14159, 0.0033, 0.0002

See also:

BETA, BP, D0, INITZY, MO