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MSP430FR6043: Not a clear idea about Ultrasonic Gas board sensing Calibration process

Part Number: MSP430FR6043

Tool/software:

Currently i am working on Ultrasonic Gas board sensing, i am completly blind about calibration process. I can't able to find the clear explanation about calibartion process for gas board sensing from the below link,
https://dev.ti.com/tirex/explore/node?node=A__AURAjHTDa0oVdd-2UTgIEQ__MSP430-ACADEMY__8HaEUeq__LATEST.

Is this calibration process required for gas board designing ? If its required how to do this ?

And i also have doubt about Resonator calibration and AGC calibration mentioned in example code for MSP5430FR6043EVM_USS_Gas_Demo. Whats the purpose of these two calibrations ? 

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