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Last modified by robert on 2026/08/12 13:08
From version 118.1
edited by robert
on 2026/08/12 13:06
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To version 115.1
edited by robert
on 2026/06/29 08:23
Change comment: There is no comment for this version

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106 106  
107 107  [[HERE>>http://auspass.edu.au/field/NODES_blank_fieldlog.pdf]] is an example logsheet that works well for nodes, feel free to print and use!
108 108  
109 -== 2. Burial ==
110 -
111 -ALL nodes should be buried flush with the ground, no exceptions. If the node is sticking up the data data quality will be significantly reduced (especially the horizontal channels, see [[below>>https://auspass.edu.au/xwiki/bin/view/Instrumentation/SmartSolo%20Nodes/#HIGU-16Horizontalnoise26howtoavoid]]). It also catches wind, makes them more visible, etc. But mostly it makes the data bad. //Don't be lazy. Do it right. //
112 -
113 -[[An example of what not to do.>>image:1786503344572-296.jpg||data-xwiki-image-style-alignment="center" height="341" width="404"]]
114 -
115 -[[North channel PSD of the sensor in the picture above (not good)>>image:1786503812585-338.02.28 PM.png||data-xwiki-image-style-alignment="center" height="244" width="451"]]
116 -
117 -== 3. Node Placement ==
109 +== 2. Node Placement ==
118 118  )))
119 119  
120 120  **Site Analysis**:
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123 123  * Take photographs from various angles to document the site setup thoroughly. Have a colleague stand next to it pointing at it.
124 124  * Include a detailed site description in your notes.
125 125  
126 -== 4. GPS Considerations ==
118 +== 3. GPS Considerations ==
127 127  
128 128  (% class="wikigeneratedid" %)
129 129  The GPS antenna is at the top and center of the unit, and will (usually) only receive signal with a clear sky view directly above. The signal is able to penetrate plastic and terracotta planters and a thin (2 cm?) layer of soil, but may struggle if the soil layer is too thick. **These nodes will not start recording without attaining a GPS lock** and repeated attempts will excessively drain the battery.
130 130  
131 -== 5. Visibility and Location Marking ==
123 +== 4. Visibility and Location Marking ==
132 132  
133 133  **Flag Placement**: Position a flag, preferably in a bright color (avoid green or yellow), near the instrument to aid in its future location.
134 134  
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137 137  * Use a GPS device to mark the instrument's exact location. Most modern cell phones can get to about a 3m error with their internal GPS also; you can probably also get away with investing a few dollars in a good app that shows error and lets you log markers.
138 138  * Also write the GPS down on paper (ie your [[LOG SHEET>>http://auspass.edu.au/field/NODES_blank_fieldlog.pdf]]).
139 139  
140 -== (% style="color:inherit; font-family:inherit; font-size:max(18px, min(20px, 14.4444px + 0.462963vw))" %)6. Charge Time, Pre-Deployment & Post-Deployment(%%) ==
132 +== (% style="color:inherit; font-family:inherit; font-size:max(18px, min(20px, 14.4444px + 0.462963vw))" %)5. Charge Time, Pre-Deployment & Post-Deployment(%%) ==
141 141  
142 142  * **Charging Duration**: Both types of nodes take approximately 6-8 hours to fully charge from a flat state.
143 143  * **Pre-Deployment Charging**:
144 144  ** Although the nodes hold their charge well, it's beneficial to give them a "top up" charge before deployment.
137 +
145 145  * **Operational Duration**:
146 146  ** When recording at 250 Hz, with GPS on and Bluetooth disabled, the instruments are expected to last about 30 days per charge cycle. If they are set to run only overnight, this can be extended to 60 days.
147 147  
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156 156  ** Charge levels for transport will be advised by the freighter. The required SoC will depend on volume and transport method (air, land, sea).
157 157  
158 158  (((
159 -== 7. Data Sharing and Metadata Creation ==
152 +== 6. Data Sharing and Metadata Creation ==
160 160  )))
161 161  
162 162  **GPS Data**:
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171 171  
172 172  * Create and organize metadata according to the [[ANU metadata standard txt file>>attach:example_metadata.txt]]. This is going to be particularly important if you are reusing nodes at different sites... not documenting the serial numbers (of the **top half** of the node) and the times they were deployed can lead to station mix-ups.
173 173  
174 -== 8. Additional Best Practices ==
167 +== 7. Additional Best Practices ==
175 175  
176 176  * **Training and Familiarisation**: Make sure all team members are adequately trained in using the GPS devices, compass use, and other equipment to ensure consistent and accurate data collection.
177 177  
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441 441  
442 442  We are aware that there are various different published responses for these instruments and trust very few of them. One has to be careful with how polarity is handled between groups as well, and if one is working in integer counts (the ANSIR default) or mV (unclear why anyone would use this as it makes file sizes enormous). The response information published below is in **counts** and seems to fit well in huddle tests. Note that the response is the same for all channels and all units (e.g. there are no bespoke calibrations!), all appear to be sample rate insensitive, and the IGU data has been inverted (multiplied by -1) as described here: [[5Hz Node Polarity Issues>>https://auspass.edu.au/xwiki/bin/view/Data/AusPass%20Data/#HSmartSoloNodePolarityIssues]]
443 443  
437 +(% class="wikigeneratedid" %)
438 +//A small note on the y-axis scale of the following plots: We are aware that raw velocity is typically scaled ~~1e-6. This data has been filtered and selected for especially quiet regions so has lower amplitude. The key point is showing the match with the known CMG-6TD and Centaur data.//
439 +
444 444  == IGU 16HR-3C ==
445 445  
446 446   '16HR3C': {'poles':[(-22.211059+22.217768j), (-22.211059-22.217768j)],
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448 448   'gain':1,
449 449   'sensitivity': 257019225.55108312}
450 450  
451 -[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:16HR_Z_huddle.png||alt="IGU16_Z_huddle.png"]]
447 +[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:IGU16_Z_huddle.png]]
452 452  
453 -[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz bandpass filter>>image:16HR_N_huddle.png||alt="IGU16_N_huddle.png"]]
449 +[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz bandpass filter>>image:IGU16_N_huddle.png]]
454 454  
455 455  == IGU 16-1C ==
456 456  
457 457  The 1C nodes seem to have the same response as the 3-channel IGU-16HR-3C (above), however the response posted at IRIS-NRL seems to imply that there is no poles and zeros information (e.g. a flat/linear response). This is 100% not so.
458 458  
459 -[[IGU-16 1C, X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz bandpass filter. Seems to be same response as IGU-16HR-3C.>>image:16HR1C_Z_huddle.png||alt="IGU16_1C_Z_huddle.png"]]
455 +[[IGU-16 1C, X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz bandpass filter. Seems to be same response as IGU-16HR-3C.>>image:IGU16_1C_Z_huddle.png]]
460 460  
461 461  == BD3C-5 ==
462 462  
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472 472  [[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz bandpass filter>>image:BD3C_N_huddle.0.5.png]]
473 473  
474 474  (% class="wikigeneratedid" %)
475 -Below the corner frequency (0.2 Hz) the phase response still fares well, but amplitude response may need to be dialed in a bit (it seems a bit high). We are working to try to calibrate this a bit better. In the next two figures the filter is **0.1** to 5 Hz:
471 +Below the corner frequency (0.2 Hz) the phase response still fares well, but amplitude response may need to be dialed in a bit (it seems a bit high). In the next two figures the filter is **0.1** to 5 Hz:
476 476  
477 477  
478 478  [[BD3C **0.1 **to 5 Hz bandpass filter>>image:BD3C_Z_huddle.0.1.png]]
16HR1C_Z_huddle.png
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XWiki.XWikiComments[0]
Author
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1 -Mark Goldman
Comment
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1 -I can verify that the default orientation for the SmartSolo 3C nodes is positive values for case motion to the South, West, and downwards. We have co-located nodes with permanent stations and noticed this correlation when comparing waveforms.
Date
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1 -2026-07-09 10:45:51.967