neclib.simulators.antenna#

Emulator for telescope antenna motion and corresponding encoder reading.

Aliases#

AzElData	AzElData(az: Any = None, el: Any = None)
InitialPosition	AzElData(az: Any = None, el: Any = None)
ParameterList	List, specialized in parameter storing.

class AntennaEncoderEmulator(device_moment_of_inertia=(<function <lambda>>, <Quantity 3000. m2 kg>), motor_torque=(<Quantity 11.5 N m>, <Quantity 11.5 N m>), angular_resolution=(<Quantity 0.13728814 arcsec>, <Quantity 0.13728814 arcsec>))[source]#

Bases: object

Emulator of antenna response for simulator.

Parameters:

device_moment_of_inertia (Tuple[Union[Quantity, Callable[[Quantity, Quantity], Quantity]], Union[Quantity, Callable[[Quantity, Quantity], Quantity]]]) – Moment of inertia of antenna.
motor_torque (Tuple[Quantity, Quantity]) – Maximum torque the motor can exert.
angular_resolution (Tuple[Quantity, Quantity]) – Angular resolution of the encoder.

Notes

To support coordinate-dependent moment of inertia, Az. and El. axes cannot independently be implemented.

Warning

API may change, as API of encoder driver module isn’t fixed yet.

Example

>>> enc = neclib.simulators.AntennaEncoderEmulator()
>>> pid_az = neclib.controllers.PIDController()
>>> speed = pid_az.get_speed(30, enc.read.az)
>>> enc.command(speed, "az")

ANGLE_UNIT: ClassVar[Literal['deg', 'rad', 'arcmin', 'arcsec']] = 'deg'#

property abs_acceleration: AzElData#: Absolute value of angular acceleration at the moment.

property dt: float#: Time interval between last two call for encoder reading.

read()[source]#

Get current encoder reading.

Notes

Acceleration during consecutive calls are approximated to be constant.

Examples

>>> v = enc.read()
>>> v.az
12.3

Return type:: AzElData

command(speed, axis)[source]#

Set angular speed of intention with angular unit ANGLE_UNIT.

Parameters:

speed (float) – Angular speed, which may be calculated by PID controller.
axis (Literal['az', 'el']) – Controlling altazimuth axis.

Return type:

None