Skip to main content

Setting up the Houston App

Setting up the period for receiving telemetry​

It is necessary to set the period for receiving telemetry from all devices to 100 milliseconds. Use the -A63 cfg_regular_telemetry command that all devices have (Picture 1):

Telemetry acquisition setup command

Picture 1. The telemetry acquisition setup command

If necessary, turn on the telemetry of the solar sensors with the command -23 tc_enable_telometry (Picture 2):

Solar sensor telemetry period

Picture 2. Solar sensor telemetry period

Save the settings of the solar sensors using the command 10-A60 cfg_save_params, the response to this command will be ~ACK.

Setting the offset of the zero DUS​

Set the offset to zero by using the 9-BD1 set_ratesens_offset command. Install OrbiCraft 3D on the arrestor so that it is stationary and remember the values of deviation from zero of the DUS readings. In the boxes of the Fields field, enter these DUS values to compensate for them (Picture 3):

Setting the zero offset

Picture 3. Setting the zero offset

The value of the zero offset should be no more than 0.2.

Graph of DUS values

Picture 4. Graph of DUS values

Save the DUS settings using the command 19-A60 cfg_save_params, the response to this command will be ~ACK.

Setting the zero offset of the magnetometer​

Setting the magnetometer zero offset

Picture 5. Setting the zero offset of the magnetometer

Setting up the orthonormalization matrix​

Orthonormalization matrix

Picture 6. Orthonormalization matrix

Request for extended telemetry​

Request extended telemetry with the command 5-A41 request_extended_telemetry (Picture 7):

Advanced Telemetry request

Picture 7. Request for extended telemetry

In response to the request, 12 responses will be received (Picture 8):

Responses to requested telemetry

Picture 8. Responses to the requested telemetry

In the History window, select the 5-F033 set_obcu_config command. All parameters should be the same as in Figure 9.

Important fields K_alpha=3, K_w=5, angular_rate_multiplikator=5, wheel_num=3, wheel_control_limit=0.01, wheel_rotor_inertia=8.4e-05 (Picture 9):

Parameters of the selected command

Parameters of the selected command

Picture 9. Parameters of the selected command

If necessary, adjust the parameter and click on the To server button to save the parameters.

Checking the solar sensors​

Requesting the configuration of solar sensors with the command 5-A50 tc_adcs_request_ss_cfg (Picture 10):

CD Configuration request

Picture 10.SD configuration request

In response, we will receive the message ~5-F04A ss_inst_matrix (Picture 11):

Received message

Picture 11. The received message

Checking the flywheels​

Requesting the configuration of the flywheels 5-A51 tc_adcs_request_wheel_cfg (Picture 12):

Flywheel configuration request

Picture 12. Flywheel configuration Request

We will get three answers 5-F049 wheel_direction. With index 0 - flywheel A, with index 1 - flywheel B, with index 2 - flywheel C (Picture 13):

Received responses

Received responses

Received responses

Picture 13. The responses received

Turn on the flywheels one at a time. Set the rotation speed of the flywheel A to 200 rpm with the command A-A01 rpm (Picture 14):

Setting the flywheel rotation speed

Picture 14. Setting the rotation speed of the flywheel

danger

It is necessary to check which flywheel has started to rotate and in which direction. The flywheel A must rotate in the direction of the "right screw".