Changes between Version 12 and Version 13 of Sensors/LeicaLIDAR/FWMikesNotes


Ignore:
Timestamp:
Apr 10, 2013 7:20:47 PM (6 years ago)
Author:
mggr
Comment:

Clarifications

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  • Sensors/LeicaLIDAR/FWMikesNotes

    v12 v13  
    2020The full waveform digitiser (FWD) is supplied as an upgrade to the existing ALS50v2 (and up) sensors, and essentially consists of an upgraded data logger and an intensity digitiser (the FWD).  The discrete point recording subsystem is unchanged.  In implementation, the FWD is added as a spur after the automatic gain controller (AGC).  There is a trigger from the discrete system to the FWD that tells the FWD when to start recording.
    2121{{{
    22                                                  +--->  Full waveform digitiser  -->--+
    23                                                  |                 ^                   |
    24  Laser receiver -> Automatic Gain Controller  -->|                 |                   |-->  Data logger
    25                                                  |                 |                   |
    26                                                  +--->  Discrete point subsystem  -->--+
     22                                                 +--->  (fixed gain booster) ---> Full waveform digitiser -->--+
     23                                                 |                                     ^                       |
     24 Laser receiver -> Automatic Gain Controller  -->|                                     |                       |-->  Data logger
     25                                                 |                                     |                       |
     26                                                 +----------------------->  Discrete point subsystem  -->------+
    2727}}}
    2828
     
    5252 * the .LWV files cannot be easily linked to the .SCN (discrete files) - there is no direct linkage between LWV file 2 and SCN file 2
    5353
    54 
    55 
    56 
    57 where did gain come from in waveform viewer
     54Where did gain come from in waveform viewer?
    5855 - volts= digitized value * gain + offset
    5956 - not agc gain, this is a fixed amplication on the waveform board
     
    6259 - system digitises from 0 to 4.something volts
    6360 - gives you volts as received at the waveform board, after AGC applied, etc - probably only useful for engineering team
    64  
     61   * More information on gains and corrections to remove the AGC effect is at [wiki:Sensors/LeicaLIDAR/FWMikesNotes/FWGainDiscussion]
    6562
    6663ops changes: various.. relevantish ones to us are