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TDC data processing

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iliasam edited this page Feb 15, 2022 · 11 revisions

Simple diagram showing how TDC data is processed in lidar firmware.

See source code and source code for scanning mode.

"Reference zero distance, BIN" is calculated during scanning using measurement distance to a "reference plate".

"BIN length" value is stored in Flash, this value must be measured and programmed to the MCU during calibration.
See "BIN Length" value in "LidarTestingUtility".
Default value ("DEFAULT_DIST_BIN_LENGTH" constant in "config.h") is near 14.5 mm/BIN.
This value is calculated like (90ps * 3e8m/s / 2) = 13.5 mm/BIN, where 90ps is resolution of TDC-GP21.

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