Sojourner Rover Telecom System Report for Sol 43 & 44
Report as of 00:50 PDT 18 August 1997
Telecom system performance was nominal this sol. The link quality was consistent with the rover modem temperature being between 0C and +10C.
The end-of-sol communication system performance for the first & only downlink was as follows:
SOL 43 & 44 TELECOM STATISTICS
Rov Radio Temp Low = -23.1
Rov Radio Temp High = 37.9
Rov Radio Temp Avg = 16.8
LMRE Radio Temp Low = -10.5
LMRE Radio Temp High = 19.6
LMRE Radio Temp Avg = 8.1
Rx Current Low = 43.5
Rx Current High = 72.5
Rx Current Avg = 52.2
Tx Current Low = 153.7
Tx Current High = 156.6
Tx Current Avg = 155.6
LMRE Good Frames = 610
LMRE Garbled Frames = 63
Avg LMRE Link Quality%= 90.6
TX_CH_FRAMES = 4518
RX_CH_FRAMES = 608
Total Frame Resends = 3910
Avg Rover Link Quality%= 13.5
COM:Bad CRC Errors = 14
COM:Timeout Errors = 37063
COM:Rx Abort Errors = 689
COM:No Sync Errors = 0
COM:RX Com Errors = 35483
In planning the sequence for Sol 45 and beyond, the same modem heating strategy should be followed:
The rover modem should be commanded in the next-day runout sequence to perform a 600 second modem heating at wakeup. If no overnight APXS operations are to be conducted, the wakeup rover modem heating should be extended to 900 seconds. Modem reheating should be triggered by an excessive number of frame retries on the rover-to-lander link, and the reheating should continue for five minutes or until the rover modem reaches +30 C. However, if the LMRE radio is commanded OFF in the lander sequence, then the reheat to get to +30C is not needed. This requires some coordination of timing between the LMRE ON times and the rover transmissions. The sequence planners should consider the uncertainty in event completion times introduced by any required modem reheating cycles.
