JED - August 2016 - (Page 42)

EW 101 Space EW - Part 3 Satellite Geometry By Dave Adamy I n this, and the next couple of columns, we will discuss some general geometrical issues with satellites and their orbits - relative to EW problems. The exercise this month is to show how to determine the range from the satellite to a point on the Earth's surface. This is, of course, so we can calculate the link loss - a key element in the effectiveness of jamming or intercept from space. Satellite North Pole Longitude of sub-vehicle point Greenwich Meridian Center of Earth Sub-vehicle point 42 The Journal of Electronic Defense | August 2016 SUB-VEHICLE POINT The point on the Earth's surface that is right below the satellite is called the sub-vehicle point (SVP). As shown in Figure 1, this point is the intersection of the line from the center of the Earth to the satellite with the surface of the Earth. The latitude of the SVP is the geocentric angle from the equator up to the SVP. The longitude of the SVP is the angle between the longitude line running through the SVP and the longitude line running through Greenwich England. Figure 1 also shows the definitions of Longitude and Latitude. Longitude lines are great circle segments - that is, each is on a plane that cuts through the center of the Earth. Latitude lines are not great circles, but the latitude is defined as the angle north or south of the equator to the latitude line. AN EARTH SURFACE LOCATION To simplify the discussion, we will assume that there is a transmitter on the satellite and a receiver on the Earth's surface. Figure 2 shows the SVP and the receiver location on the Earth. Latitude of sub-vehicle point Equator Figure 1: The sub-vehicle point is the intersection of a line from the center of the Earth to the satellite with the Earth's surface. North Figure 1: The sub-vehicle point isLongitude the intersection of a line from the Center of the Earth 's surface. Poleto the satellite with the Earth Receiver location Sub-vehicle point Latitude of sub-vehicle point Center of Earth Latitude of receiver A b c a B Figure 2: A spherical triangle is formed between the North Pole, the sub-vehicle point and the receiver location. Figure 2:A spherical triangle is formed between the North pole, the sub-vehicle point and the receiver location. C

Table of Contents for the Digital Edition of JED - August 2016

The View From Here
Conferences Calendar
Courses Calendar
From the President
The Monitor
World Report
Cyber Blitz: US Army Gains New Insight for EW/Cyber Operational Integration
Technology Survey: Solid State Power Amplifiers for EW, Radar and Communications Applications
EW 101
Threat Monitor
AOC Election
Index of Advertisers
JED Quick Look

JED - August 2016

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