To build the “ideal” A Train constellation we will use
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To build the “ideal” A Train constellation we will use STK - Satellite Tool Kit by AGI PowerPoint PPT Presentation


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To build the “ideal” A Train constellation we will use STK - Satellite Tool Kit by AGI Next we will add a Ground Stations at Fort Wayne, add a sensor to CloudSat and adjust the swath of the CloudSat CPR sensor. Lets add Fort Wayne to our

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To build the “ideal” A Train constellation we will use STK - Satellite Tool Kit by AGI

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To build the ideal a train constellation we will use stk satellite tool kit by agi

To build the “ideal” A Train constellation we will use

STK - Satellite Tool Kit by AGI

Next we will add a Ground Stations at Fort Wayne, add a sensor to CloudSat and adjust the swath of the CloudSat CPR sensor.


To build the ideal a train constellation we will use stk satellite tool kit by agi

Lets add Fort Wayne to our

A Train scenario. Select Insert>Facility From City Database.


To build the ideal a train constellation we will use stk satellite tool kit by agi

Type in and search for

Fort Wayne and then select insert.


To build the ideal a train constellation we will use stk satellite tool kit by agi

Fort Wayne now shows up on the globe.


To build the ideal a train constellation we will use stk satellite tool kit by agi

How about if we wanted to determine when the satellites can communicate with the Fort Wayne ground station?

Select Access


To build the ideal a train constellation we will use stk satellite tool kit by agi

Select all the satellites and then hit the “Compute” button.


To build the ideal a train constellation we will use stk satellite tool kit by agi

When the satellite can communicate to the Fort Wayne ground station a line appears between the satellite and Fort Wayne


To build the ideal a train constellation we will use stk satellite tool kit by agi

Let remove all the reference grids and vectors and add the CPR instrument to CloudSat


To build the ideal a train constellation we will use stk satellite tool kit by agi

To add an instrument select Insert>Object Catalog

The Object Catalog form will pop-up and select “Sensor”


To build the ideal a train constellation we will use stk satellite tool kit by agi

The new sensor “footprint” or swath defaults to a Simple Conic, 45 degrees.


To build the ideal a train constellation we will use stk satellite tool kit by agi

CloudSat’s CPR actually has a rectangular swath.

CloudSat swath

1. 4 km by 2.5 km


To build the ideal a train constellation we will use stk satellite tool kit by agi

The swath dimensions must be translated into angles.

(eq 2)

(eq 1)

(eq 3)

Use equation 1 to determine

Based on how big you want your “swath” to be

Use equation 2 to determine

Use equation 3 to determine

Two “nadir angles” entered into STK for

Vertical and Horizontal Half Angles

embedded spreadsheet

http://www.smad.com/store/bookstore/stl/smad3err.pdf


To build the ideal a train constellation we will use stk satellite tool kit by agi

STK has some additional information of creating a rectangular sensor pattern in the STK help area.


To build the ideal a train constellation we will use stk satellite tool kit by agi

Entered the full angles not the half angles. It should get a swath that is twice as wide and twice as long?


To build the ideal a train constellation we will use stk satellite tool kit by agi

Width is 1.4 km?

Using this tool measure the width and length of the swath.


To build the ideal a train constellation we will use stk satellite tool kit by agi

Length is 2.5 km?

Swath size is 1.4 by 2.5 for the angles entered. Conclusion, if you use the spreadsheet “nadir angles” you do not need to divide by two.


To build the ideal a train constellation we will use stk satellite tool kit by agi

6 ft

1/8 inch

0.5 miles

By comparison using the calculated swath size (1.4 km) divided by the CloudSat altitude (705 km), a six foot man looks like 1/8 inch tall from a half a mile awayand would be hard to see. Therefore, we will scale the size of the swath.

We will scale the swath width and length by 50 times so we can see it better.

We will make the swath

2.84° by 5.07°


To build the ideal a train constellation we will use stk satellite tool kit by agi

First we will change the Sensor Type to “Rectangular”


To build the ideal a train constellation we will use stk satellite tool kit by agi

With the Vertical Half Angle to 2.84°and the Horizontal Half Angle to 5.07°. Actually, is will make our swath area 2500X larger than the actual swath size for CloudSat’s CPR.


To build the ideal a train constellation we will use stk satellite tool kit by agi

Click to see

measurement

of the swath size

Swath area increased by 2500X times or 8,740 km2

Click on the picture to see the scenario.


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