Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas...
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Transcript of Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas...
![Page 1: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/1.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
Communications - AntennasRef: SMAD Sections – 13 Communications Architecture
![Page 2: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/2.jpg)
Introduction to Space Systems and Spacecraft DesignUniversity of Idaho
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Communications I
How do these antennas work?
RF – radio frequency
![Page 3: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/3.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Ground Antennas
![Page 4: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/4.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Ground Antennas
![Page 5: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/5.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Ground Antennas
![Page 6: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/6.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Spacecraft Antennas
![Page 7: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/7.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Spacecraft Antennas
![Page 8: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/8.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Ground Antennas
![Page 9: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/9.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Ground Antennas
![Page 10: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/10.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Ground Antennas
![Page 11: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/11.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Ground Antennas
![Page 12: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/12.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Ground Antennas
![Page 13: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/13.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Ground Antennas
![Page 14: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/14.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Spacecraft Antennas
![Page 15: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/15.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Spacecraft Antennas
![Page 16: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/16.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Spacecraft Antennas
![Page 17: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/17.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Spacecraft Antennas
![Page 18: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/18.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Spacecraft Antennas
![Page 19: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/19.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Spacecraft Antennas
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Spacecraft Antennas
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Spacecraft Antennas
![Page 22: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/22.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Spacecraft Antennas
![Page 23: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/23.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Spacecraft Antennas
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Spacecraft Antennas
![Page 25: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/25.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
![Page 26: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/26.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
W = Power Density – W/M2
S = distance from antenna to a point in space
La = atmospheric loss
EIRP = effective isotropic radiated power
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Antenna gain for a parabolic antenna
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
( )2
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
![Page 33: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/33.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
![Page 34: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/34.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
What is the affect on the gain of antennas with frequency?
When perfect impedance match – get 100% transfer to antenna
100%
Perfect impedance match – get VSWR = 1.0
![Page 36: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/36.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
What is the affect on the gain of antennas with frequency?
What happens when VSWR > 1.0?
<100% forward wave
Output power of antenna (gain) is less off resonant frequency.
Reflected wave
![Page 37: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/37.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
What is the affect on the gain of antennas with frequency?
The gain on all antennas are frequency sensitive.
![Page 38: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/38.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
¼ wavelength antenna above a ground plane
Center fed ½ wavelength
~
~
Antenna Polarization
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Electric field lines froma ½ wave antenna
Generated vertical electric field lines
Vertically polarized antenna
Antenna Polarization
Ground
(B) (A)
(C)
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
(C) Electric field lines from
a ½ wave antenna
Horizontal electric field lines
Horizontal polarized antenna
(A) (B)
Antenna Polarization
Ground
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Communications - Antennas Antenna Polarization
Circular Polarization Helical Antenna
Spiraling electric field
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas Antenna Polarization
Circular Polarized Helical Antenna
Rotating electric field
Counter clockwiserotating
Looking to forward end of antenna
LHP – left hand polarization
Clockwiserotating
Looking to forward end of antenna
RHP – left hand polarization
![Page 43: Introduction to Space Systems and Spacecraft Design Space Systems Design Communications - Antennas Ref: SMAD Sections – 13 Communications Architecture.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d5a5503460f94a3a6da/html5/thumbnails/43.jpg)
Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas Antenna Polarization
Polarized Antenna Coupling
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas Antenna Polarization
What type of antenna polarization should be used on satellites and ground stations?
V polarization?H polarization?LH circular?RH circular?
V polarization?H polarization?LH circular?RH circular?
What about when satellite is coming toward you?
What about when satellite is going away from you?
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas Antenna Polarization
Didn’t answer the question of polarization on the ground and on the satellite???
Something tricky happens to the polarization as the RF passes through the atmosphere to and from the satellite.
We will find out when we look further at the link equations.
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Introduction to Space Systems and Spacecraft DesignSpace Systems Design
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Communications - Antennas
Questions?