HEPOS_gen_guidelines_v1_1_gr 2009 1 4

HEPOS

. HEPOS HEPOS.

.

A1.

( 7.3.1 7.3.2) 87

HEPOS.

A2. HEPOS

HEPOS HTRS07 (Hellenic Terrestrial Reference System 2007), ETRS89 (European Terrestrial Reference System 1989) . ETRS89, ITRS (International Terrestrial Reference System) WGS84 1m. HEPOS HTRS07. HEPOS (www.hepos.gr -> downloads). , :

, RINEX CRINEX, , (VRS) (. www.hepos.gr -> -> HEPOS, 24/02/2009 -> HEPOS)

, ( format RTCM).

A3. 87 HEPOS -

87 HEPOS .. HTRS07 87. 8cm . 87 HEPOS

HTRS07 87

. :

, HEPOS (www.hepos.gr -> downloads)

GPS RTK, .

. ( .. HEPOS_GGRS87, ).

HEPOS_gen_guidelines_v1_1_gr 2009 2 4

:

HEPOS

D, DY, DZ, 87 RTK, GPS, 87. (. www.hepos.gr -> -> HEPOS, 24/02/2009 -> HTRS07 - 87 ).

HEPOS, 87

WGS84 87 ( -200 m,

+74 m, +246m). HEPOS (

),

87,

(. www.hepos.gr -> -> HEPOS, 24/02/2009 -> HTRS07 - 87 http://www.hepos.gr/hepos/HEPOS_pres_2009h_gr.pdf).

87 HEPOS . () HEPOS 87. , , .

,

87 HEPOS. ..

GPS ( , ), HEPOS GPS (.. , ) . , , ( ).

B. GPS HEPOS

, .

1.

GPS . DOP (Dilution of Precision) PDOP. :

5. , . , 6 7 , , .

HEPOS_gen_guidelines_v1_1_gr 2009 3 4

GPS .

PDOP. PDOP

, RTK. RTK PDOP 3 . , PDOP (4-5). ( 15

).

2.

GPS. . :

- - . GPS . , , . ,

.

. SNR, . , L2, L1 . .

multipath, .

: (.. )

3.

:

(rapid-static) RTK (.. 10mm + 1ppm). ( - ) . , . ,

(.. )

RTK.

, . GPS (planning) PDOP , .

( ,

, multipath, )

.

HEPOS_gen_guidelines_v1_1_gr 2009 4 4

, . , , -- .

HEPOS

. .

, :

4. RTK

GPS, RTK :

RTK 10mm + 1ppm. o , PDOP, 5 multipath. ( - ) 2-3cm. .

RTK cm, ,

fixed . float

. float . , float 10cm, 40 - 60 cm.

fixed, . . fixed,

. float . , :

RTK ,

RTK ( )

RTK

(rapid-static)