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Data synchronization between ATI-K sonic anemometer and LI7500A

vk Mar 15, 2016 09:10 AM

I have ATI-K sonic anemomter from M/s Applied Technology,Inc and LI-7500A. The ATI-K has one scan delay (0.1sec) and LI-7500A has 0.297 sec or ~3 scan delay. The ATI-K data are recieved using serial port and is logged separately in a file. I would like to synchronize these two sets of data so that there is no delay while storing  them in the data logger, CR3000. Sampling frequency is 10 Hz. I would appriciate and be thankful if anybody can help me how to achieve this while writing CR3000 code.

Thankyou for your kind help...

vk Mar 16, 2016 04:35 AM

While seaching for solution to the above question, I came across a code for CSAT3 and LI7500. Part of the code is listed below. In the below code, I failed to understand few things.

1. What is the logic behind selecting number 16 (OFFSET = 16)

2. Why so many recoreds (14 records) for "Const CSAT_REC_BCK = OFFSET-DELAY_CSAT" is required to push back.

3. why so many records (13 records) for 'IRGA_REC_BCK = OFFSET-DELAY_IRGA' is required to push back.

Offcourse it is meant for synchronization but I am not  getting logic behind them.

Kindly help me to understand above doubt /difficulties.

Thank you,

part of the code for CSAT3 and LI7500


Const OFFSET = 16 'An offset delay that will be introduced to the CSAT3, LI-7500, and analog data.
Const DELAY_CSAT = 2 'Fixed inherent lag of the CSAT3 data (two scans).
'Fixed inherent lag of the LI-7500 data (three scans at 10 Hz or six scans at 20 Hz).

'Determine scan buffer size, CSAT3 Execution Parameters and fixed lags for CSAT3 and LI-7500.
Const SCAN_BUFFER_SIZE = 300*INT (1000/SCAN_INTERVAL) 'Compute 5 minute scan buffer.
Const CSAT_OPT = INT (1000/SCAN_INTERVAL) 'Compute CSAT3 Execution Parameter (10 or 20 Hz).
Const CSAT_REC_BCK = OFFSET-DELAY_CSAT 'Number of records back to align CSAT3 data.
Const IRGA_REC_BCK = OFFSET-DELAY_IRGA 'Number of records back to align LI-7500 data.

sellerskaylee Nov 23, 2023 09:51 AM

I found a code for CSAT3 and LI7500 while searching for the answer to the previous question. Listed below is a portion of the code. A couple of things in the code below are beyond my comprehension. wordle today

kkefuuc Feb 11, 2024 02:25 PM

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vịetheo Mar 1, 2024 03:21 AM

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AlexRose Mar 12, 2024 05:58 AM

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cameliablossom Mar 15, 2024 10:22 PM

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