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 = "C34_TRIG_A4" 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 = 2005-01-27 NOTE = " TRIG_A4.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 A4." END_OBJECT = TEXT END Trigger A4 Description Sequence: C34, C35 Trigger A4 ( HRSED 182 kbps Hirate Mode ) This mode is designed to provide a hirate mode for analyzing fine structure of SED's, while also providing a low temporal resolution spectrum at the spectral resolution. This is accomplished by running the WBR in the "down-convert" mode, using the 25-KHz wide signal provided by the HFR, which is simultaneously running in millisecond at the frequency provided to the WBR. This mode of operation is paused every 64 seconds for 8 seconds, in order to perform a normal analysis sweep, nominally in SEDDF mode. At this time, the LFDR is also sampled. These provide the low temporal resolution spectrum. At each 64-second interval the millisecond mode frequency is toggled between each of two selections: 2 MHz and 10 MHz. These frequencies could be tweaked with additional commands. WFR data acquisition and Dust detection are not done. Langmuir Probe sweeps are performed every 640 seconds. A Sounder measurement is scheduled every 10 minutes. It is assumed that prior to this trigger, either trigger A0 (SEDDF) or trigger 8E (Night-Time Survey) was in effect. Receiver Frequency Range Sensors Time between Snapshots Snapshot Length -------- -------------------- ------- ---------------------- --------------- LFR 1 - 25 Hz EX, BX 64 seconds MFR 25 - 12 KHz EX, BZ 32 seconds HFR 3.6 KHz - 16 MHz EX, EW 64 seconds HFR 2 MHz or 10 MHz band EX 2.25 seconds 2048 WBR 2 MHz or 10 MHz band EX 0.125 second 4096 LP N/A Probe 640 seconds Sounder 3.6 - 115 KHz EX, EW 600 seconds The HFR is in a modified "Composite Survey" mode, which now includes both auto- and cross-correlations for H1, and differs from standard Survey mode in that its integration constants for H1 and H2 are shorter. 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 16 n 1000 1 3.6-319 kHz H1 2E y y 2 n 20 1 60 25 325k-1.8MHz H2 1E n n 1 n 10 1 72 200 1.8M-16MHz Bands ABC require 3.16 sec to complete, H1 requires 1.57 sec, and H2 requires 0.65 sec for a total of 5.62 sec per sweep. This fits into the 8-second slot allowed for the normal analysis performed every 64 seconds. Every 600 seconds the HFR normal analyses are interrupted by a Sounder analysis. The Sounder operation has a duration of approximately 40 seconds. This Sounder analysis is defined by: sounder mode: EZ AAA 1st sounder freq: 0 last sounder freq: 89 T1 delay: 10 msec T2 delay: 25 msec T3 delay: 25 msec passive spectra: 2 active spectra: 2 # of cycles: 1 sounder output A: 3 autos sounder output B: 3 AGCs