Mock Dish Master Device
Introduction
Mock implementation of the SKA Dish Master Tango device based on the interface provided by https://gitlab.com/ska-telescope/ska-sim-dishmaster.
Usage
This mock implementation when in the ON state will simulate mocked attributes listed below of the real device using a mock dataset. Mocking must be started using the Start command and may be stopped (for restart) using the Stop command.
Additionally, the device will automatically transition to the Off state when at the end of the mock data stream.
For API usage see ska_sdp_mock_dish_devices.MockDishMaster.
States
State |
Description |
|---|---|
OFF |
Device is initialized and is not simulating |
ON |
Attributes are being continuously simulated from mock data by the device |
Properties
Property |
Type |
Values |
Description |
|---|---|---|---|
mock_achieved_paths |
String |
‘’{“1”: “mnt/data/pointings.hdf”}’` |
Json mapping of scan id to a path of PointingTable collections in HDF5 format for achievedPointing |
antenna_id |
Int32 |
0 |
Antenna ID within the pointing data |
time_scale |
Float |
1.0 |
Scale factor for the timing interval pointings are read |
Commands
Command |
Argument type |
Return type |
Action |
|---|---|---|---|
Scan |
int |
None |
Set device state to ON |
EndScan |
None |
None |
Set device state to OFF |
Attributes
Attribute |
Type |
Format |
Values |
Description |
|---|---|---|---|---|
achievedPointing |
Float64 |
SPECTRUM[3] |
[Offset since Epoch, az, el] |
Marks the dish actual pointing direction in radians for a corresponding timestamp. |
Note
For a full list of planned attributes see https://gitlab.com/ska-telescope/ska-sim-dishmaster/-/blob/master/src/ska_sim_dishmaster/dish_master.fgo
Offset since Epoch
These are specified as an offset in SI seconds (or multiples/sub-multiples of SI seconds) from the TAI epoch of midnight, 1 January 2000, which equates to 1999-12-31T23:59:28Z UTC. See https://confluence.skatelescope.org/display/SWSI/ADR-78+SKA+approach+to+timestamps+in+time+sensitive+data for more information.
Note
The UTC equivalent is different because at the start of Y2000 UTC was 32 seconds behind TAI (it is now further behind because of leap second adjustments).