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 = "C27_TRIG_94" 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_94.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 94." END_OBJECT = TEXT END Trigger 94 Description Sequence: C27 Trigger 94 ( Aurora/SKR Mode, outside source crossing & low latitudes ) This mode is designed to provide a survey mode with full direction-finding (DF-3) up to 1.8 MHz. Both low and high frequency WFR measurements are made. In high-frequency mode, there are 512 samples taken for the EX, EW, and BX antennas. These channels are also analyzed onboard using the LFDR FFT software, and the LFDR data is provided in addition to the waveform data. In low-frequency mode, 5-channel 1024-sample WFR measurements are made every 64 seconds. Langmuir Probe sweeps are performed every 32 seconds; density measurements are made at a 100-Hz sampling rate to match the Low-Frequency WFR measurements. A simple up-going ramp sweep is performed; with a future software update, this will become a down-going voltage ramp. A Sounder measurement replaces the HFR data every 320 seconds. Receiver Frequency Range Sensors Time between Snapshots -------- ---------------- -------------- ---------------------- LFR 0.1 - 2.5 KHz EX, EW, BX 32 seconds MFR 25 - 12 KHz EZ, BZ 32 seconds WFR(LF) 1 - 25 Hz EX,EW,BX,BY,BZ 64 seconds WFR(HF) 0.1 - 2.5 KHz EX,EW,BX 32 seconds HFR 3.6 KHz - 16 MHz EU, EV, EW, EX 32 seconds LP N/A Langmuir Probe 32 seconds Sounder 3.6 - 115 KHz EX, EW 320 seconds The HFR is in direction-finding mode for bands A, B, C, and H1. 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 8 y 1000 1 3.6-319 kHz H1 2E y y 1 y 80 1 60 25 325kHz-1.8MHz H2 1E n n 1 n 20 1 72 50 1.8kHz-16MHz Bands ABC require 6.42 sec to complete, H1 requires 10.31 sec, and H2 requires 1.46 sec for a total of 18.19 sec per sweep. However, the time between analyses is set to 32 seconds, in order to reduce interference due to antenna-switching done during the direction-finding measurements. Every 320 seconds the HFR normal analyses are replaced 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