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4.7.3 AME Sun Sensor Conditioning Electronics

The logic level 1 and 0 provided by the sensors are routed to the AME where the leading and trailing edges of the sun crossings are generated and sent to the Data Handling Subsystem as datation signals which are telemetered for ground processing and at the same time used by the onboard Spin Reference Pulse algorithm.

In case of double crossing of the sun (solar aspect angle less than 12.5 degrees), the AME resolves the ambiguity using the information provided by the MSI sensor. A simplified diagram is given in Figure 4.51.

Figure 4.51 AME sun sensor electronics

In the more complex case when both XBS sensors are on and the solar aspect angle is lower than 12.5 degrees, the following datation signals are generated:

Next: 4.7.4 Onboard Generation of the SRP

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