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  P

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The Project for the Capacity Development for Transition to the New CNS/ATM Systems in Cambodia, ao PD!, and "ietnam

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DOP

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The Project for the Capacity Development for Transition to the New CNS/ATM Systems in Cambodia, ao PD!, and "ietnam

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GDOP = HDOP + VDOP + TDOP2 2 2 2

PDOP2

•GDOP 

(x, y, z, t

•PDOP 

(x, y, z•HDOP

 

(x, y•VDOP

 

(z• TDOP

 

(t

・ＧＤＯＰ、ＨＤＯＰ、ＶＤＯＰ、ＰＤＯＰ、ＴＤＯＰ

 Type o! DOP

"

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The Project for the Capacity Development for Transition to the New CNS/ATM Systems in Cambodia, ao PD!, and "ietnam

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DOP #a$ue

• %o&er t'e GDOPPDOP #a$ue, )ettert'e instantaneous point positionso$ution*

 – PDOP #a$ues " are #ery goo-

 – PDOP #a$ues .ore t'an /0 are #ery poor

 – VDOP is typica$$y aroun- "

 – Genera$$y, GDOP an- PDOP s'ou$- )e 1 an- HDOP s'ou$- )e )et&een 23

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The Project for the Capacity Development for Transition to the New CNS/ATM Systems in Cambodia, ao PD!, and "ietnam

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DOP conr.ation

'at representation is GDOP #a$ue4

'ic' GDOP is )etter !or positioning4

GDOP= 5

 GDOP= 2

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