Ping Time Shift
This operator can shift pings in time.
You can shift all pings forward or back in time. This is similar to a Fileset Properties Time offset.
Or you can shift ping times from a relative ping index. This is useful if viewing raw (sample power, sample angle) telegrams at the same time as processed telegrams from a Simrad Ex500 or Ex60 because there is an error in the time of either the raw or the processed data (a one ping offset).
See also Wideband frequency response considerations.
You enter the settings for this operator on the Ping time shift page of the Variable Properties dialog box.
Notes:
- Use of this operator to shift pings in one direction and then latter shift pings in the other direction may result in the loss of ping data.
- See also Degraded frequency response considerations.
Echoview accepts a single operand of the following data types as input:
- Angular position
- Boolean
- Color
- Complex power dB
- Complex Sv
- Complex TS
- Current velocity
- Linear
- Multibeam angular position
- Multibeam boolean
- Multibeam color
- Multibeam magnitude
- Multibeam phase
- Multibeam Sv
- Multibeam targets
- Multibeam TS
- Multibeam unspecified dB
- Power dB
- Pulse compressed complex angular position
- Pulse compressed complex power dB
- Pulse compressed complex Sv
- Pulse compressed complex TS
- Single targets
- Sv
- Target length
- TS
- Unspecified dB
Settings
The Ping Time Shift Variable Properties dialog box pages include (common) Variable Properties pages and these operator pages:
Operands page
Ping Time Shift page
|
Setting |
Description |
|
Shift pings by time |
Choose to shift pings by a specified time. |
|
Add or Subtract |
Select Add to shift pings forward in time. Select Subtract to shift pings back in time. The time shift is specified by values for:
|
|
Assign ping times from the relative ping index |
Choose to shift the ping times such that ping n in the result is at the time of ping n+m in the operand, where m is the value of this setting. m=0 would produce a copy of the operand. |