slide1
Download
Skip this Video
Download Presentation
A Simulator for the LWA

Loading in 2 Seconds...

play fullscreen
1 / 131

A Simulator for the LWA - PowerPoint PPT Presentation


  • 118 Views
  • Uploaded on

A Simulator for the LWA. Masaya Kuniyoshi (UNM). Outline. 1.Station Beam Model 2.Asymmetry Station Beam 3.Station Beam Error 4.Summary. (Aaron Cohen LWA Memo Series [55]). 256 dipoles. (Leonid Kogan LWA Memo Series [21]). 2π. ( D ・ u ). Ψ =. j. j. λ. 2π. ( D ・ S ). Φ =. j.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' A Simulator for the LWA' - corine


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

A Simulator for the LWA

Masaya Kuniyoshi (UNM)

slide2

Outline

1.Station Beam Model

2.Asymmetry Station Beam

3.Station Beam Error

4.Summary

slide4

256 dipoles

(Leonid Kogan LWA Memo Series [21])

slide5

( D・ u )

Ψ =

j

j

λ

( D・ S )

Φ =

j

j

λ

= Zenith

S (0,0 )

S (10,0 )

Simulation model for a station beam

255

E(θ,φ)=ΣGaussian(θ,φ)exp(iP )exp(Ψ-Φ)+Noise

j

j

j

j=0

Gaussian(θ,φ) = individual primary beam

Station beam

Station beam

φ[degree]

φ[degree]

θ[degree]

θ[degree]

slide6

Normalized Power Pattern

θ[°] (angle form zenith)

slide7

Normalized Power Pattern

θ[°] (angle form zenith)

slide8

Normalized Power Pattern

θ[°] (angle form zenith)

slide9

Normalized Power Pattern

θ[°] (angle form zenith)

slide10

Normalized Power Pattern

θ[°] (angle form zenith)

slide11

Normalized Power Pattern

θ[°] (angle form zenith)

slide12

Normalized Power Pattern

θ[°] (angle form zenith)

slide13

Normalized Power Pattern

θ[°] (angle form zenith)

slide14

Normalized Power Pattern

θ[°] (angle form zenith)

slide15

Normalized Power Pattern

θ[°] (angle form zenith)

slide16

Normalized Power Pattern

θ[°] (angle form zenith)

slide17

Normalized Power Pattern

θ[°] (angle form zenith)

slide18

Normalized Power Pattern

θ[°] (angle form zenith)

slide19

Normalized Power Pattern

θ[°] (angle form zenith)

slide20

Normalized Power Pattern

θ[°] (angle form zenith)

slide21

Normalized Power Pattern

θ[°] (angle form zenith)

slide22

Normalized Power Pattern

θ[°] (angle form zenith)

slide23

Normalized Power Pattern

θ[°] (angle form zenith)

slide24

Normalized Power Pattern

θ[°] (angle form zenith)

slide25

Normalized Power Pattern

θ[°] (angle form zenith)

slide26

Normalized Power Pattern

θ[°] (angle form zenith)

slide27

Normalized Power Pattern

θ[°] (angle form zenith)

slide28

Symmetry

Normalized Power Pattern

θ[°] (angle form zenith)

slide29

Asymmetry

Normalized Power Pattern

θ[°] (angle form zenith)

slide30

Asymmetry

Normalized Power Pattern

θ[°] (angle form zenith)

slide31

Normalized Power Pattern

8°

9°

13°

28°

θ[°] (angle form zenith)

slide32

80MHz

20MHz

50MHz

Asymmetry rate

HPBW left side/ HPBW right side

θ[°] angle from zenith

slide33

θ

Dsinθ

D

As the angle θgoes from 0 to π/2,

the value of cosθ(differentiation of sinθ) gets smaller.

As a result, the beam becomes asymmetric.

This effect increases as the frequency decreases.

slide34

θ =-70°

Zenith = 0 °

Beam pattern

peak

θ

(degree)

slide35

θ =-60 °

Zenith = 0 °

Beam pattern

peak

θ

(degree)

slide36

θ =-50 °

Zenith = 0 °

Beam pattern

θ

(degree)

slide37

θ =-40 °

Zenith = 0 °

Beam pattern

θ

(degree)

slide38

θ =-30 °

Zenith = 0 °

Beam pattern

θ

(degree)

slide39

θ =-20 °

Zenith = 0 °

Beam pattern

θ

θ

(degree)

slide40

θ =-10 °

Zenith = 0 °

Beam pattern

θ

θ

(degree)

slide41

θ =0 °

Zenith = 0 °

Beam pattern

θ

θ

(degree)

slide42

θ =10 °

Zenith = 0 °

Beam pattern

θ

θ

(degree)

slide43

θ =20 °

Zenith = 0 °

Beam pattern

θ

θ

(degree)

slide44

θ =30 °

Zenith = 0 °

Beam pattern

θ

θ

(degree)

slide45

θ =40 °

Zenith = 0 °

θ

slide46

θ =50 °

Zenith = 0 °

Beam pattern

θ

θ

(degree)

slide47

θ =60 °

Zenith = 0 °

Beam pattern

peak

θ

θ

(degree)

slide48

θ =70 °

Zenith = 0 °

Beam pattern

peak

θ

θ

(degree)

slide49

θ =-70 °

Grating lobe

Zenith = 0 °

λ

・57.3≒43°

d

Beam pattern

Grating lobe

θ

(degree)

slide50

θ =-60 °

Grating lobe

Zenith = 0 °

Beam pattern

Grating lobe

θ

(degree)

slide51

θ =-50 °

Grating lobe

Zenith = 0 °

Beam pattern

Grating lobe

θ

(degree)

slide52

θ =-40 °

Grating lobe

Zenith = 0 °

Beam pattern

Grating lobe

θ

(degree)

slide53

θ =-30 °

Zenith = 0 °

Grating lobe

Beam pattern

θ

(degree)

slide54

θ =-20 °

Zenith = 0 °

Grating lobe

Beam pattern

θ

(degree)

slide55

θ =-10 °

Zenith = 0 °

Beam pattern

Grating lobe

Grating lobe

θ

(degree)

slide56

θ =0 °

Zenith = 0 °

Beam pattern

Grating lobe

Grating lobe

θ

(degree)

slide57

θ =10 °

Zenith = 0 °

Beam pattern

Grating lobe

Grating lobe

θ

(degree)

slide58

θ =20 °

Zenith = 0 °

Grating lobe

Beam pattern

θ

(degree)

slide59

θ =30 °

Zenith = 0 °

Grating lobe

Beam pattern

θ

(degree)

slide60

Grating lobe

θ =40 °

Zenith = 0 °

Beam pattern

Grating lobe

θ

(degree)

slide61

Grating lobe

θ =50 °

Zenith = 0 °

Beam pattern

Grating lobe

θ

(degree)

slide62

θ =60 °

Grating lobe

Zenith = 0 °

Grating lobe

slide63

θ =70 °

Grating lobe

Zenith = 0 °

Beam pattern

Grating lobe

θ

(degree)

slide64

Station beam at 20MHz

Station Beam

(-60,0)

Φ[°]

0

20

40

-60

θ[°]

60

slide65

Station beam at 20MHz

Station Beam

(-50,0)

Φ[°]

0

20

40

-60

θ[°]

60

slide66

Station beam at 20MHz

Station Beam

(-40,0)

Φ[°]

0

20

40

-60

θ[°]

60

slide67

Station beam at 20MHz

Station Beam

(-30,0)

Φ[°]

0

20

40

-60

θ[°]

60

slide68

Station beam at 20MHz

Station Beam

(-20,0)

Φ[°]

0

20

40

-60

θ[°]

60

slide69

Station beam at 20MHz

(-10,0)

Station Beam

Φ[°]

0

20

40

-60

θ[°]

60

slide70

Station beam at 20MHz

(0,0)

Station Beam

Φ[°]

0

20

40

-60

θ[°]

60

slide71

Station beam at 20MHz

Station Beam

(10,0)

Φ[°]

0

20

40

-60

θ[°]

60

slide72

Station beam at 20MHz

Station Beam

(20,0)

Φ[°]

0

20

40

-60

θ[°]

60

slide73

Station beam at 20MHz

Station Beam

(30,0)

Φ[°]

0

20

40

-60

θ[°]

60

slide74

Station beam at 20MHz

Station Beam

(40,0)

Φ[°]

0

20

40

-60

θ[°]

60

slide75

Station beam at 20MHz

Station Beam

(50,0)

Φ[°]

0

20

40

-60

θ[°]

60

slide76

Station beam at 20MHz

Station Beam

(60,0)

Φ[°]

0

20

40

-60

θ[°]

60

slide77

Station beam at 60MHz

Station Beam

Grating lobe

(-60,0)

Φ[°]

0

20

40

-60

θ[°]

60

slide78

Station beam at 60MHz

Station Beam

(-40,0)

Grating lobe

Φ[°]

0

20

40

-60

θ[°]

60

slide79

Station beam at 60MHz

Station Beam

(-20,0)

Grating lobe

Φ[°]

0

20

40

-60

θ[°]

60

slide80

Station beam at 60MHz

Station Beam

Φ[°]

0

20

40

-60

θ[°]

60

slide81

Station beam at 60MHz

Station Beam

(20,0)

Grating lobe

Φ[°]

0

20

40

-60

θ[°]

60

slide82

Station beam at 60MHz

Station Beam

Grating lobe

(40,0)

Φ[°]

0

20

40

-60

θ[°]

60

slide83

Station beam at 60MHz

Grating lobe

Station Beam

(60,0)

Φ[°]

0

20

40

-60

θ[°]

60

slide84

Summary

1. Asymmetry rate of a station beam → beam elevation & observing frequency

2.The direction error of a station beam → beam elevation & primary beam

Future Plan

@ Addition of a real dipole beam pattern to the simulator

@ Addition of band widths to the simulator

@ Dipole configuration to remove the grating lobes

@

@

★Completion of the simulator for the LWA

slide86

同じ方向を見た場合

20~80MHz

slide101

The gap between beams.

29MHz ->172 degrees

30MHz -> 115 degrees

40MHz -> 86 degrees

50MHz -> 69 degrees

60MHz -> 57 degrees

70MHz -> 49 degrees

80MHz -> 43 degrees

slide104

3D one station beam figure

20MHz 0deg 20deg 40deg 60deg

slide105

HPBW

∝ P

θ

slide106

規格化バージョン

0、30、60°

slide113

zenith

なぜ小さいか理由も入れる

軸を消してもいいかも!

-40 degrees

slide129

We need a simulator because there is no LWA station.

If you get the simulator, you could find some problems in LWA before the construction.

slide130

ここにkumarからもらったシミュレーションソフトをここにkumarからもらったシミュレーションソフトを

改造してLWA100mバージョンにした

最終的な(クリーン後)を入れる

最終的にこのようなソフトを作りたい

しかし、これは1ステーションを100mと

考えた時の、実際のステーションの位置

を入れたデータである。

実際に256ダイポールからなるステーションビーム

でシミュレーションソフトを作成することが目的。

slide131

θ

Dsinθ

D

ad