guideline and standards for skytem measurements, processing and ...
guideline and standards for skytem measurements, processing and ...
guideline and standards for skytem measurements, processing and ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
(December 2010)<br />
High moment 4 (HM4)<br />
Number of turns, Tx-loop 4<br />
Tx-loop area 314 m² / 494 m²<br />
Current<br />
~100 A /~90 A<br />
Tx moment ~125600 Am2 / ~179000 Am 2<br />
Repetition frequency<br />
25 Hz<br />
On-time 10000 µs<br />
Off-time 10000 µs<br />
Wave<strong>for</strong>m<br />
Number of series per moment 96<br />
Front-gate time<br />
Exponential ramp-up, then linear turn-off followed by an<br />
exponential turn-off<br />
~ 50 µs / Ca. 70 µs (time in script file)<br />
Software channel ID Moment 1 Component Signal/Noise<br />
1 SLM Z Signal<br />
2 HM Z Signal<br />
3 SLM X Signal<br />
4 HM X Signal<br />
5 SLM Z Noise<br />
6 HM Z Noise<br />
7 SLM X Noise<br />
8 HM X Noise<br />
1 Because LM is not in use anymore the SLM is on channel 1, 3, 5, <strong>and</strong> 7.<br />
$ % & <br />
<br />
' <br />
The following tables contain settings <strong>for</strong> the measuring system<br />
General measuring sequence<br />
Number of moments 2<br />
Moment 1<br />
Moment 2<br />
SLM<br />
HM<br />
Noise measurement HM, stack size 32<br />
Moment sequence<br />
Alternating SLM, HM <strong>and</strong> noise. A noise measurement is<br />
recorded <strong>for</strong> every 20th SLM <strong>and</strong> HM measurement<br />
Gate times*/ gate distribution SLM, HM<br />
Time interval: 6 µs to 7 µs<br />
Time interval: 6 µs to 13 µs<br />
Time interval: 13 µs to 10 ms<br />
1 µs gate width<br />
2 µs gate width<br />
10 gates per decade approximately logarithmically distribution<br />
Gate-centre time definition<br />
Arithmetic mean of gate-open <strong>and</strong> gate-close<br />
* Approximate gate centre times after calibration correction<br />
Navigation instruments<br />
Altimeters<br />
Frame inclination<br />
Positioning<br />
Minimum data from one laser mounted on the Tx frame.<br />
Minimum data from one inclinometer mounted on the Rx<br />
plat<strong>for</strong>m<br />
Minimum data from one GPS<br />
3
Change language