Changes between Version 6 and Version 7 of Sensors/LeicaLIDAR/MikesNotes

Timestamp:

Aug 26, 2008, 3:38:47 PM (16 years ago)

Author:

mggr

Comment:

--

Sensors/LeicaLIDAR/MikesNotes

@@ -33 +33 @@
 
 Consider reflectivity of surface - lighter surfaces need less laser power (too high a power means overflows on the reflection, though AGC should deal with this for the most part..).
+
+Recommended to do a figure 8 loop at the start and end of the data acquisitions to make the IMU happy.  Need one at the end for reverse navigation processing.
 
 == Overall system design and comments of note ==
@@ -106 +108 @@
 
 Lever arm measurements:
- * IMU -> sensor head
+ * IMU -> sensor head (centre of mirror?)
    * Measured in the factory and provided by Leica
  * IMU -> measurement point [front left corner of the casing]
@@ -114 +116 @@
 
 Intensity Based Range Correction (IBRC).
- * A correction based on the reflectivity of the target object ("reflections are slower on darker objects"?).
+ * A range correction based on the reflectivity of the target object ("reflections are slower on darker objects"?  perhaps this is more that a lower intensity return may take longer to be detected - ie. takes longer for enough photons to come back to exceed the detection threshold).
  * Measured in factory and provided by Leica.
 
+= Processing =
+== Extraction ==
+
+Use IPAS Pro to extract GPS, IMU and laser data from the raw files.
+ * probably worth having the real time navigation info (doesn't add a lot of processing time)
+ * during extraction, view the listing and verify the lever arms are correct (IMU one should never change).
+ * look out for data gaps (listed in log)
+
+== Navigation processing ==
+
+See other pages on navigation processing as they cover this already.