REG NASA-LLIS-1197-2002 Lessons Learned Deep Space 2 Telecom Hardware-Software Interaction (1999).pdf
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1、Lessons Learned Entry: 1197Lesson Info:a71 Lesson Number: 1197a71 Lesson Date: 2002-04-25a71 Submitting Organization: JPLa71 Submitted by: Eric D. Archer/David OberhettingerSubject: Deep Space 2 Telecom Hardware-Software Interaction (1999) Abstract: Because the final subsystem thermal test of the De
2、ep Space 2 telecommunications subsystem was deleted, an important hardware-software interaction was missed.To fully validate performance, test integrated software and hardware over the flight operational temperature range. Description of Driving Event: During post launch bench thermal testing of the
3、 Deep Space 2 (DS-2) telecommunications subsystem (TS), it was discovered that the DS-2 transmit frequency was out of specification when the flight spare electronics was exposed to low temperatures ( -80 C). Upon investigation, a previously unknown hardware-software interaction was discovered.Provid
4、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-D In the design of the TS, the flight software commands a temperature measurement of the master crystal oscillator. This measurement is made to adjust the oscillator frequency to compensate for previously cha
5、racterized, temperature induced, frequency drifts. The software then refers to a lookup table, and applies the appropriate compensation needed to keep the oscillator frequency within specification over the flight allowable operational temperature. Troubleshooting indicated that, due to a programming
6、 error, the software fails to power a sensor ASIC during the period when temperature should be measured by the device. This error was not apparent during ambient testing because the software defaults to a fixed level of compensation at room temperature.During assembly and test of the DS-2 flight har
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