Trigger 7A Description
Sequence: C14 (Venus-2) (ESB)
Trigger 7A (Venus-2 Observation with mS)
This mode cycles the HFR through Venus-2 and mS mode while LFR, WFR, and MFR data is obtained.
This trigger must be sent after Trigger 74, and cannot be issued stand-alone. This trigger is designed
to work with Triggers 78 and 7C (i.e. Trigger 74 must be used for initial setup, but Triggers 78 and/or
Trigger 7C may occur prior to Trigger 7A). Setup in this mode requires about 2 seconds. The HFR millisecond
mode is cycled through 3 frequencies (9125 kHz, 1525 kHz, and 5325 kHz), with 32 seconds of HFR mS data at each
of these frequencies seperated by 32 seconds of analysis mode HFR data (see Trigger 74).
| Receiver |
Frequency Range |
Sensors |
Cycle Time |
| LFR |
1 - 25 Hz |
EX, BX |
16 seconds |
| MFR |
25 - 12 KHz |
EX, BZ |
32 seconds |
| WFR |
.1 - 2.5 KHz |
EX, EW, BX, BY, BZ |
342 seconds |
| HFR analysis |
3.6 KHz - 16 MHz |
EX |
2.5 seconds |
HFR mS
|
9125, 1525, 5325 kHz |
EX |
1.375 seconds |
The HFR analysis mode is defined by:
Correlations Channels Integ. Size Frequency
Band Ant. Auto- Cross- per Band df Period Rep Steps kHz Start - Stop
---- ---- ----- ------ -------- -- ------ --- ----- ---- ------------
ABC 1E y n 32 n 125 1 3.6 kHz-319 kHz
H1 1E n n 1 n 20 1 12 350 125 kHz-3.975 MHz
H2 1E n n 1 n 10 1 8 1500 5.475MHz-15.975 MHz
The HFR is free-running, resulting in:
Bands ABC require 0.242 sec to complete, H1 requires 0.242 sec, and H2 requires 0.098 sec
for a total of 2.33 sec per sweep. However, the HFR actually only performs one complete
sweep every 2.5 seconds.
The HFR mS mode is defined as a fixed frequency (9125, 1525, and 5325 kHz), 1024 samples taken at a
rate of 1 mS obtained every 1.375 seconds, fo 32 seconds.
The resulting HFR modes are:
9125 kHz mS mode (32 seconds)
HFR free run (32 seconds)
1525 kHz mS mode (32 seconds)
HFR free run (32 seconds)
5325 kHz mS mode (32 seconds)
HFR free run (32 seconds)
repeat