Sensors & Software Inc. NG250 ユーザーズマニュアル
12-Survey & Map Mode
Noggin
86
3) Noggin 500
4) Noggin 1000
4) Noggin 1000
12.3.1.5 Stacks
Some materials tend to absorb radar signals and limit penetration. These materials are said to
be lossy. When collecting data in lossy areas or areas with a lot of radio frequency noise, one
way of increasing data quality is to collect more than one trace at each survey position, average
them and save the averaged trace. This is known as “stacking”. Data quality improves because
the noise, which is usually random (like white noise on a TV screen with no station in the area),
tends to zero when averaged. Consequently, the usable signal is easier to see. This is known as
increasing the “signal-to-noise ratio”.
be lossy. When collecting data in lossy areas or areas with a lot of radio frequency noise, one
way of increasing data quality is to collect more than one trace at each survey position, average
them and save the averaged trace. This is known as “stacking”. Data quality improves because
the noise, which is usually random (like white noise on a TV screen with no station in the area),
tends to zero when averaged. Consequently, the usable signal is easier to see. This is known as
increasing the “signal-to-noise ratio”.
Figure: 12-7 The concept of stacking data. At each data location point, the trace is collected multiple times. These
traces are averaged together to calculate the trace that is actually saved. Stacking improves the data quality by
increasing the signal to noise ratio.
The amount of Stacking can vary from 1 to 2048 by factors of 2.
While stacking improves data quality, it also forces the user to slow down survey production. The
more stacks the longer it takes to collect data at each survey position. Therefore, it is important to
find the lowest number of stacks that still reveal the target adequately. For most surveys, stacking
4 times is suitable.
more stacks the longer it takes to collect data at each survey position. Therefore, it is important to
find the lowest number of stacks that still reveal the target adequately. For most surveys, stacking
4 times is suitable.
See the warning in Section 12.2.7 Collecting Data using the Odometer about losing data if the
Smart System is moving too quickly for the odometer to keep up.
Smart System is moving too quickly for the odometer to keep up.
Increasing Data Quality with DynaQ
If the Trigger Method (Section 12.3.2.2 Trigger Method) is set to odometer, one of the options
for Stacking is DynaQ.
for Stacking is DynaQ.