This document provides information on designing satellite communication links. It discusses key factors that influence system design such as frequency band, propagation effects, and multiple access techniques. The performance objectives and parameters of earth stations and satellites are outlined. Methods for calculating noise temperature, link budgets, and overall C/N ratio are presented. The document provides examples of designing links using different satellite systems and frequency bands.
This presentation covers:
Basics of Satellite communication
Indian Communication satellites
Satellite link and elements of satellite communication
Frequency bands of satellite communication
Different orbits of satellite communication
Link budget calculations
this presentation is about satellite communication which includes working of gps ,vsat ,frequency bands ,needs of communication satellite ,types of satellite ,working ,orbits ,elements involved in working ,transponder ,satellite control center ,satellite network
This is the presentation on GPS AIDED GEO AUGMENTED NAVIGATION (GAGAN) developed by India and thus becoming the 4th country after USA, Europe & Japan to have its own SBAS (Satellite Based Augmented Navigation).
This presentation covers:
Basics of Satellite communication
Indian Communication satellites
Satellite link and elements of satellite communication
Frequency bands of satellite communication
Different orbits of satellite communication
Link budget calculations
this presentation is about satellite communication which includes working of gps ,vsat ,frequency bands ,needs of communication satellite ,types of satellite ,working ,orbits ,elements involved in working ,transponder ,satellite control center ,satellite network
This is the presentation on GPS AIDED GEO AUGMENTED NAVIGATION (GAGAN) developed by India and thus becoming the 4th country after USA, Europe & Japan to have its own SBAS (Satellite Based Augmented Navigation).
Satellite Link Design:
EIRP, Transmission Losses, Free-space transmission, System noise temperature and G/T ratio, Noise figure, Design of downlinks, Design of uplink, Design of specified C/N: combining C/N and C/I values in satellite links, Overall C/No, Link design procedure.
satellite communication jntuh
Satellite Link Design: Basic Transmission Theory, System Noise Temperature, and G/T Ratio,
Design of Down Links, Up Link Design, Design Of Satellite Links For Specified C/N, System Design
Examples.
Multiple Access: Frequency Division Multiple Access (FDMA), Inter modulation, Calculation of C/N,
Time Division Multiple Access (TDMA), Frame Structure, Examples, Satellite Switched TDMA
Onboard Processing, DAMA, Code Division Multiple Access (CDMA), Spread Spectrum Transmission
and Reception.
This presentation covers:
Different types of antennas used in satellite communication
Role of an antenna
Antenna temperature
Cassegrain feed Antenna
Parabolic antenna
The calculation of power received by an earth station from a satellite is fundamental to the understanding of satellite communication.
Consider a transmitting source, in free space, radiating a total power Pt watts uniformly in all directions.
Such source is called isotropic.
At a distance R meters from isotropic source, flux density crossing the surface
F= Pt / 4 πR2 (W/m2 )
For a transmitter with output Pt watts driving a lossless antenna with gain Gt , the flux density at distance R meters is
F= PtGt / 4 πR2 (W/m2 )
The product PtGt is called effective isotropic radiated power or EIRP, it describes the combination of transmitting power & antenna gain in terms of an equivalent isotropic source with power PtGt watts.
For a transmitter with output Pt watts driving a lossless antenna with gain Gt , the flux density at distance R meters is
F= PtGt / 4 πR2 (W/m2 )
The product PtGt is called effective isotropic radiated power or EIRP, it describes the combination of transmitting power & antenna gain in terms of an equivalent isotropic source with power PtGt watts.
Satellite Link Design:
EIRP, Transmission Losses, Free-space transmission, System noise temperature and G/T ratio, Noise figure, Design of downlinks, Design of uplink, Design of specified C/N: combining C/N and C/I values in satellite links, Overall C/No, Link design procedure.
satellite communication jntuh
Satellite Link Design: Basic Transmission Theory, System Noise Temperature, and G/T Ratio,
Design of Down Links, Up Link Design, Design Of Satellite Links For Specified C/N, System Design
Examples.
Multiple Access: Frequency Division Multiple Access (FDMA), Inter modulation, Calculation of C/N,
Time Division Multiple Access (TDMA), Frame Structure, Examples, Satellite Switched TDMA
Onboard Processing, DAMA, Code Division Multiple Access (CDMA), Spread Spectrum Transmission
and Reception.
This presentation covers:
Different types of antennas used in satellite communication
Role of an antenna
Antenna temperature
Cassegrain feed Antenna
Parabolic antenna
The calculation of power received by an earth station from a satellite is fundamental to the understanding of satellite communication.
Consider a transmitting source, in free space, radiating a total power Pt watts uniformly in all directions.
Such source is called isotropic.
At a distance R meters from isotropic source, flux density crossing the surface
F= Pt / 4 πR2 (W/m2 )
For a transmitter with output Pt watts driving a lossless antenna with gain Gt , the flux density at distance R meters is
F= PtGt / 4 πR2 (W/m2 )
The product PtGt is called effective isotropic radiated power or EIRP, it describes the combination of transmitting power & antenna gain in terms of an equivalent isotropic source with power PtGt watts.
For a transmitter with output Pt watts driving a lossless antenna with gain Gt , the flux density at distance R meters is
F= PtGt / 4 πR2 (W/m2 )
The product PtGt is called effective isotropic radiated power or EIRP, it describes the combination of transmitting power & antenna gain in terms of an equivalent isotropic source with power PtGt watts.
Digital Communication and Modulation
Project 3 “Satellite Link Budgets and PE”
Arlene Meidahl - s107106 and Danish Bangash-s104712| Digital Communication | 21. maj 2015
Supervisor: John Aasted Sørensen
This three day course is intended for practicing systems engineers who want to learn how to apply model-driven systems Successful systems engineering requires a broad understanding of the important principles of modern spacecraft communications. This three-day course covers both theory and practice, with emphasis on the important system engineering principles, tradeoffs, and rules of thumb. The latest technologies are covered. <p>
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TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
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This document will discuss each of the underlying technologies to create and implement an e- commerce website.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
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When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
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2. Contents (Syllabus, 8 Hrs)
Introduction
Basic Transmission Theory
System Noise Temperature and G/T Ratio
Design of Downlinks
Satellite Systems using small Earth Stations (ES)
Uplink Design
Design of Specified C/N: Combining C/N and C/I
values in Satellite Links
System Design Examples
3. Text Book:
Satellite Communications- T Pratt, Charles Bostian,
Jeremy Allnutt, John Wiley & Sons.
Reference Book:
Satellite Communications- Dennis Roody, McGraw
Hill
4. Introduction
Design of a SCS is a complex process and requiring
compromises between many factors to achieve best
performance at an acceptable cost.
Three factors influence system design:
i. Frequency band
ii. Atmospheric propagation effects
iii. Multiple access technique
5. Performance objectives: (in baseband channel)
Demodulator
C/N
BER (digital link)
SNR (analog link)
C/N > 6dB
C/N < 10 dB (digital link)-must use error correction to
improve BER calculated at the i/p of receiver ( or o/p port
of receiving antenna)
For Noise less receiver :- It is constant at all points (RF
and IF chain)
Overall C/N: UL and DL
IF
Amplifier
C/N
8. Antenna Look Angles
For ES antenna alignment, Two Angles need to be
adjusted and fixed:
Azimuth Angle
Elevation Angle
Jointly referred as Antenna Look Angles.
Elevation Angle (Θ:- 0 to π) Azimuth Angle(Φ:- 0 to 2π)
10. Satellite Functions
(RF to RF conversion)
1. Signal reception: Uplink frequency
2. Processing of signal:
Amplification, Filtration, and Down conversion, etc
3. Signal retransmission: Downlink frequency
19. TV Signal link (FTA)
TV Rebroadcasting
Station- DD-I/II
(Sinhagad , Pune )
DD National, New Delhi
DBS-TV
20. TV Signal link (Pay)
Up-link
Down-link
DD Kendra, Worli, Mumbai
(C-Band)
DBS-TV
DBS-TV
Down-link
Ku Band (Thodapur, New Delhi)
21. Basic Transmission Theory
Satellite and Microwave link: Line-of-Sight (LoS)
Link analysis relates the Pt and Pr.
The flux density and link equation can be used to
calculate the Pr.
22. The flux density in the direction of the antenna bore sight at
a distance R meters is given by:
Pt = Output Power
Gt = Transmitting antenna gain
Pt Gt = Effective Isotropic Radiated Power or EIRP
R= Distance between source and receiving antenna.
A = Receiving antenna aperture area (m2)
Aperture efficiency:
Accounts for losses: blockage, phase errors,
polarization, and mismatches)
Cassegrain antennas 50 to 75%
Horn : 90 %
23.
24. Pr = EIRP + Gr – Lp – La – Lta – Lra (dBW)
La = attenuation in atmosphere
Lta = losses associated with transmitting antenna
Lra = losses associated with receiving antenna
25. Noise Temperature
Noise Temperature:
Pn = KTpBn
where:
k = Boltzmann’s constant (-228.6 dBW/K/Hz)
Tp = Physical temperature of source in (kelvin
degrees or dBK)
Bn = Noise bandwidth (in Hz or dBHz)
27. Pno=kTsBnGrx
Pn=KTsBn
C/N=PrGrx/KTsBnGrx=Pr/KTsBn
Pno= Noise power at demodulator i/p
Grx= Overall ene-to-end gain of the receiver
Ts=System noise temperature
Pn= Noise power at receiver i/p
C/N at demodulator
Pr=signal power at
receiver i/p
C= Pr for constant envelope signal (FM or PSK)
30. Noise Figure (NF)
It is frequently used to specify the noise generated
within a device.
NF = (SNR)in/(SNR)out
NF = 1 or 0 dB (Ideal receiver)
Td = To (NF-1)
Td=Noise temperature
To= Reference temp (290 K)
31. G/T Ratio for ESs
• C/N= [PtGtGr/kTsBn][λ/4πR]2
= [PtGt/kBn][Gr/Ts] [λ/4πR]2
C/N α G/T Gr/Ts=G/T
Increasing
Increases
32. Design of Downlinks
The design of any satellite communication is based on two
objectives:
i. Meeting a minimum C/N ratio
ii. Carrying the maximum revenue earning traffic
at minimum cost.
All satellite links are affected by rain attenuation
C-band:- Effect of rain is small
Ku/Ka-band:- Effect of rain is large
Rain attenuation is a variable phenomenon, both in time and
place
Satellite links are designed to achieve reliabilities of 99.5 to
99.99%, averaged over a long period of time.
33. Link Budgets
It is a tabular method for estimating the Pr and N in a radio
link. Also to calculate C/N ratio.
It quantifies link performance
It uses dB units for all quantities.
The link budget must be calculated for an individual
transponder, and must be repeated for each of the individual
links.
In a 2-way satellite link:- C/N for 4 separate links.
34. These are usually calculated for a worst case, the one
in which the link will have the lowest C/N ratio.
Factors of worst case scenario:
Location of ES at the edge of the satellite coverage
zone
Maximum path length (S to ES)
Elevation angle at ES
Worst
case
35. ES antennas are assumed to be pointed directly at the
satellite, and therefore operate at their on-axis gain.
If the antenna is mispointed, a loss factor is included
for reduction in antenna gain.
36.
37. Link margin:
Clear air: 16.0 - 9.5 = 6.5 dB
In Rain: 12.7 – 9.5 = 3.2 dB
Solution:
Uplink Power Control (UPC)
38. Satellite Systems Using small ESs
Small, low-cost ESs:
Satellites carry only one or two telephone or data
channels or a DBS -TV signal.
Two parameters in Pr equation:
i. Satellite transmitted power
ii. Satellite antenna beamwidth (or G)
39. Ku-Band Receiving Antennas
DTH
(D < 1m)
Transponders are more
powerful
VSAT:
(D:1 to 2 m)
Transponders are less
powerful
40.
41. • A=Aca + Arain dB
• Tsky=270×(1-10-A/10) K
• TA=ɳc ×Tsky K
• Ts rain= TLNA+TA K
• ΔNrain=10 log10[Ts rain/Tsca] dB
A= Total path attenuation
Aca = Clear sky path attenuation
Arain = Rain attenuation
Tsky= Sky noise temperature
TA=Antenna noise temperature
ɳc= Coupling coefficient (90 to 95%)
ΔNrain=Increase in noise
power due increase in Ts
Tsca= System noise
temperature in clear sky
conditions
42. • Crain=Cca-Arain dB
• (C/N)dn rain = (C/N)dn ca - Arain - ΔNrain dB
For Linear (bent pipe) transponder:
(C/N)o = (C/N)up + (C/N)dn rain
Crain= Carrier power in rain attenuation
Cca= Carrier power in clear sky conditions
43. Uplink Design
Easier than the downlink
Accurate specified carrier power can be presented at
the satellite transponder
High power transmitter at ES can be used
Transmitters are costlier than the receivers.
Major growth in satellite communications: Point to
multipoint transmission (Cable TV and DBS-
TV/Radio)
44. • Nxp=k + Txp + Bn dBW
• Prxp= Pt + Gt + Gr – Lp - Lup dBW
• (C/N)up= 10 log10 (Pr/N) = Prxp - Nxp dB
Nxp= Noise power at transponder i/p
Txp = System noise temperature of the
transponder
Prxp = Received power at transponder i/p
Lp = path loss
Lup = all uplink losses
45. Design of Specified C/N: Combining C/N and C/I
values in Satellite Links
Sources of Noise
Thermal noise
For complete satellite link
Receiver it self
Receiving antenna
Sky noise
Satellite transponder
Adjacent satellites
Terrestrial transmitter
Atmospheric gases
Rain
Demodulator
C/N
BER (digital link)
SNR (analog link)
IF
Amplifier
C/N
46. Reciprocal C/N formula (measured in ES@ o/p of IF
amplifier)
(C/N)o =1/[1/(C/N)1 + 1/(C/N)2 + 1/(C/N) 3 + …]
(C/N)o = C/(N1+N2+N3+….) Carrier power is same
(C/N)o = C dBW- 10 log10(N1+N2+N3+…. W) dB
(C/N)o = (C/N)dn => due to transponder and ES
Demodulator
C/N
BER (digital link)
SNR (analog link)
IF
Amplifier
C/N
47. Interference:
• Intermodulation products (IM) generated by the
transponder’s nonlinear i/o characteristic.
• IM power level = (C/I) must be include in (C/N)o
• Interference from adjacent satellites when small
receiving antennas are used (e.g., VSAT and DTH)
• Interference cancellation techniques can be used to
reduce the level of interference
48. Overall (C/N)o with uplink and downlink attenuation
Effect of change in (C/N)up on (C/N)o depending on
the operating modes (or types) and gain of the
transponder
• Linear Pout = Pin+ Gxp dBW
• Nonlinear Pout = Pin+ Gxp – ΔG dBW
• Regenerative Pout = constant dBW
Pout = Power delivered by transponder HPA
to transmitting antenna
Pin = Power delivered by receiving antenna
to transponder
Gxp = gain of transponder
ΔG = loss of gain due nonlinear saturation
characteristics of transponder
49. Output backoff
Saturated output power is the maximum output power and is nominal
transponder power rating that is usually quoted.
ISI and IM product (FDMA) results- when the transponder operating (non-
linear characteristic) close to its saturated output power level.
Transponders are usually operated with output backoff, to make the
characteristic more nearly linear.
Typical values of backoff:
1 dB- single FM or PSK carrier (Input backoff: 3dB)
3 dB- FDMA with several carrier (Input backoff: 5dB)
50. Uplink and Downlink Attenuation in Rain
Rain attenuation affects both uplink and downlink
Rain attenuation is occurring on either uplink or
downlink, but not on both at the same time.
Assumption: True for ESs are well separated
geographically
Example: PCCOE, Ravet to Balewadi (< 20 km)-
Rain attenuation occurs on both links at the same
time.
51. Uplink Attenuation and (C/N)up
Linear
(C/N) o uplink rain = (C/N) o clear air – Aup
Nonlinear
(C/N) o uplink rain = (C/N) o clear air – Aup + ΔG
Regenerative or AGC
(C/N) o uplink rain = (C/N) o clear air
52. Downlink Attenuation and (C/N)dn
Linear
(C/N)dn rain = (C/N)dn clear air – Arain –ΔNrain
(C/N) o = 1/[1/(C/N)dn rain +1/(C/N)up]
(C/N)up is clear air and remains constant regardless
of the attenuation on the downlink
53. Design Procedure
(One-way satellite link)
1. Determine the frequency band
2. Determine the communications parameters of the satellite.
Estimate any values that are not known.
3. Determine the parameters of the transmitting and receiving
ESs.
4. Start at the transmitting ES. Establish an uplink budget and a
transponder noise power budget to find (C/N)up.
5. Find the output power of the transponder based on
transponder gain or output backoff.
54. 6. Establish a downlink power and noise budget for the
receiving ES. Calculate (C/N)dn and (C/N)o for a station at
the edge of the coverage zone (worst case)
7. Calculate SNR or BER in the baseband channel. Find the link margins.
8. Evaluate the result and compare with the specification requirements.
Change the parameters of the systems as required to obtain acceptable
(C/N)o or SNR or BER values. This may require several trial designs.
9. Determine the propagation conditions under which the link must operate.
Calculate the outage times for uplink and downlinks.
10. Redesign the system by changing some parameters if the link margin are
inadequate. Design can be implemented within the expected budget.
57. Satellite link design using Ku-band GEO with bent
pipe transponders to distribute digital TV signals to
many receiving stations(US).
Minimum permitted overall C/N of 9.5dB
58. Ku-Band Uplink Design:
Noise power Budget
k=Boltzmann’s constant -228.6 dBW/K/Hz
Ts= 500 K 27.0 dBK
B= 43.2MHz 76.4 dBHz
N= Transponder noise power -125.2 dBW
Pr= -125.2+30 dB -95.2 dBW
Required C/N at the i/p of transponder
59. Gt=10 log 10[ɳe×(πD/λ)2]=55.7 dB ɳe = 68% D=5m
λ=0.0212m@14.15GHz
Lp =10 log 10[(4πR/λ)2]=207.2 dB
Power Budget
Pt= ES transmit power ? dBW
Gt= ES antenna gain 55.7 dB
Gr= Satellite antenna gain 31.0 dB
Lp = Free space path loss -207.2 dB
Lant= ES on 2 dB contour -2.0 dB
Lm= other losses -1.0 dB
Pr= Received power at transponder -123.5 dB
The required power at the transponder i/p is 30 dB-123.5 dB = - 95.2 dBW
Pt-123.5 dB= -95.2 dB= 28.3 dBW or 675 W
Required C/N at the i/p of transponder
60. Ku-Band Downlink Design:
1/ (C/N)dn = 1/(C/N)o - 1/(C/N)up (not in dB)
(C/N)dn = 17.2 dB (C/N)o=17 dB (C/N)up= 30 dB
Noise power budget
k=Boltzmann’s constant -228.6 dBW/K/Hz
Ts= 30+110 K 21.5 dBK
B= 43.2MHz 76.4 dBHz
N= Transponder noise power -130.7 dBW
Pr = -130.7 dBW+17.2 dB = -113.5 dBW
61. Lp =10 log 10[(4πR/λ)2] λ=0.0262m@11.45GHz
Lp =207.2-20 log 10[(14.15/11.45]=205.4 dB
Pt=19 dBW-1 dB= 18 dBW (1 dB below 80 W)
Power budget
Pt= Satellite o/p power 18.0 dBW
Gt= Satellite antenna gain 31.0 dB
Gr= ES antenna gain ? dB
Lp = Free space path loss -205.4 dB
Lant= ES on -3 dB contour of satellite antenna -3.0 dB
Lm= other losses -0.8 dB
Pr= Received power at transponder -160.2 dB
Gr-160.2 dB= -95.2 dB Gr= 46774 or 46.7 dB
D= 2.14 m Gr=ɳe×(πD/λ)2] = 46774 ɳe = 68%