PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM DATA_SET_ID = {"CO-V/E/J/S/SS-RPWS-4-SUMM-KEY60S-V1.0", "CO-V/E/J/S/SS-RPWS-2-REFDR-ALL-V1.0", "CO-V/E/J/S/SS-RPWS-3-RDR-LRFULL-V1.0", "CO-V/E/J/S/SS-RPWS-2-REFDR-WBRFULL-V1.0", "CO-V/E/J/S/SS-RPWS-2-REFDR-WFRFULL-V1.0"} PRODUCT_ID = "C2_TRIG_10" PRODUCT_VERSION_ID = "1.00" PRODUCT_TYPE = ANCILLARY INSTRUMENT_HOST_NAME = "CASSINI ORBITER" INSTRUMENT_HOST_ID = CO INSTRUMENT_NAME = "RADIO AND PLASMA WAVE SCIENCE" INSTRUMENT_ID = RPWS OBJECT = TEXT PUBLICATION_DATE = 2005-03-17 NOTE = " TRIG_10.TXT describes the RPWS instrument configuration for the High Frequency Receiver (HFR), the Medium Frequency Receiver (MFR), the Low Frequency Receiver (LFR), the Waveform Receiver (WFR), the Wideband Receiver (WBR), the Langmuir Probe (LP), the Sounder, and the onboard Dust detection algorithm when using Trigger 10." END_OBJECT = TEXT END Trigger 10 Description Sequence: C2 (Antenna Deployment) Trigger 10 (Sounder and Langmuir Probe Checkout) This mode is part of the antenna deployment checkout. It runs a series of checkouts internal to the instrument. It starts with one HFR Sounder pulse in default mode and then it does a Langmuir Probe checkout. This trigger lasts for about 5 minutes. After the Sounder test, the HFR is in its default mode. After the Langmuir Probe checkout ends, the instrument internally executes Trigger 30. LFR, MFR, WBR and WFR data are collected during this trigger, with the receivers connected to the Langmuir Probe and the individual cylinders when appropriate. The internal sequence of this trigger is: Operation Duration ------------------------- ---------- HFR Sounder 12 seconds Ex- Cylinder Bias -13 V 32 seconds Ex- Cylinder Bias 0 V 32 seconds Ex- Cylinder Bias +13 V 32 seconds Ex+ Cylinder Bias -13 V 32 seconds Ex+ Cylinder Bias 0 V 32 seconds Ex+ Cylinder Bias +13 V 32 seconds LP Sphere Checkout 96 seconds Enter Trigger 30 Mode During the initial inflight use of Trigger 10, 20, and 30 (during the antenna deployment in C2), the HFR did NOT go into the expected mode due to a software feature between the HFR and the order that the HFR commands were issued from the onboard sequence and the IEB (see ISA Z44412 for a discussion of this issue and the solutions implemented to prevent this from occurring in future sequences. This problem only occurred during the antenna deployment sequence, and not when the Triggers were sent individually. Comments have been added to the C2 timeline to note which periods had Triggers that did not operate as expected. The primary affect of this problem was that Trigger 30 did NOT put the HFR in the expected mode at the end of Trigger 10 and 20 (the HFR stayed, or entered its default mode). Furthermore, for the first two uses of Trigger 20 (1997-298T00:15 and 03:38), the HFR collected no data during the internal Antenna checkout part of the trigger, resulting in no HFR data for about five minutes. Receiver Frequency Range Sensors Time between Snapshots -------- ---------------- ------------------ ---------------------- LFR 1 - 25 Hz EW, BX 16 seconds MFR 25 - 12 kHz EX, EW 32 seconds WFR .1 - 2.5 kHz EU, EV, LP, BY, BZ 16 seconds WBR 0.1 - 10.5 kHz LP 8 seconds HFR 3.6 KHz - 16 MHz EX, EW 24 seconds LP N/A Langmuir Probe 16 seconds SOUNDER 3.6 - 115 KHz EW N/A The HFR is in the following 'default' mode after the initial Sounder checkout. This mode is defined by: Correlations Channels Integ. Size Frequency Band Ant. Auto- Cross- per Band df Period Rep Steps kHz Start - Stop ---- ---- ----- ------ -------- -- ------ --- ----- ---- ------------ ABC 2E y y 32 n 1000 1 3.6-319 kHz H1 2E y y 4 n 160 1 70 25 250k-1.975MHz H2 2E y y 1 n 80 1 70 200 2.025M-15.825MHz Bands ABC require 3.12 sec to complete, H1 requires 12.30 sec, and H2 requires 6.27 sec for a total of about 21.7 sec per sweep. However, the time between analyses is set to 24 seconds. The Sounder operation has a duration of approximately 12 seconds. This Sounder analysis is defined by: sounder mode: EZ AAA 1st sounder freq: 0 last sounder freq: 89 T1 delay: 5 msec T2 delay: 5 msec T3 delay: 5 msec passive spectra: 0 active spectra: 1 # of cycles: 1 sounder output A: 3 autos sounder output B: 3 AGCs