Payload Alignment Functionality 

Test Description: The objective of this test is to verify the mechanical alignment of the payload antenna assembly by measuring the distance between certain points of the reflector to the feed. These distances will enable the verification of the  reflector-feed angle which is a critical parameter directly impacting the antenna’s ability to generate and direct signals effectively while in orbit. This test is to be conducted in both room temperature conditions and freezing conditions [-20° C].

This test aims to ensure that the measured angle falls within the specified tolerance of ±1°. Maintaining this alignment accuracy is essential to maximize antenna gain and overall signal performance, thereby guaranteeing that the payload meets its communication and mission objectives.

Completed: IN-PROGRESS

Documented by: Daniel Asante [ Mechanical Lead ]

Resources Required:

• Tools: Non-stretchy string, double sided tape, Felt-pen/ Marker, measuring tape/ ruler, Scissors.

• Hardware and Equipment: Engineering Model of the payload subsystem

• PPE: Personal protection equipment for tests and environment (Jacket, gloves.)

Verification Activities: 

• N/A

• N/A

Pass Criteria: IN-PROGRESS

Test Apparatus

1. A custom mounting frame to securely hold the engineering model during deployment tests. NOTE: There must be enough room beside the EM to allow for full deployment without damaging the reflector.

2.  Power supply and monitoring equipment to activate and monitor the burn wire, set to TBD Volts and TBD Amps.

3. After successful deployments, non-stretchy strings and a measuring tool will be used to measure the distance between certain points of reflector and feed.

Test Procedures

1.  Allow for successful deployment of payload and Feed Arm.

2. Measure and mark the midpoints of the feed and Reflector

3. Attach non-stretchy string to certain points on the reflector to feed as indicated below using double-sided tape or by hand.  Position the non-stretchy thread/string along the required measurement track and use a felt pen/marker to indicate the end points of on the thread. Use Scissors to cut string at end-points. The various measurement points are indicated below.

FIRST MEASUREMENT

SECOND MEASUREMENT

THIRD MEASUREMENT

FOURTH MEASUREMENT

4. Tabulate the results and compare with CAD model measurements

Data Analysis

1)    Analyze the measurement results to check correspondence with CAD model information. Attached is the measurement range from CAD model when the reflector is displaced ±1° from it's original position.

2)  This data analyses shows the possible deviations in feed and reflector position.