AlfaRadio AlfaSpid Rotator and Controller Uživatelský manuál stáhnout pdf (Strana 5)

Octavian CRISTEA, Paul DOLEA, Paul Vlăduţ DASCĂL

68 TELECOMUNICAŢII ● Anul LII, nr. 2/2009

3.4. The link budget for the GOLIAT

nanosatellite

GOLIAT is the first Romanian nanosatellite,

scheduled for launch in 2010. The main purpose of

this satellite is to detect micrometeorites and cosmic

rays and to take photos of the Earth with a 3Mpx

digital camera [10]. The satellite is equipped with a

MHX-2400 Slave modem and an 2400 MHz quarter

wavelength monopole antenna which will be used to

transmit payload data to the ground station.

The space-earth link budget for Goliat was

evaluated using the AMSAT / IARU Annotated Link

Model System [11].

For the alleged Kepler elements – see Table 3.4

and Fig. 3.

The orbital parameters can suffer minor changes

and the exact values are known after a successful

launch of the nanosatellite.

Table 3.4

GOLIAT nanosatellite orbital parameters

Parameter Value Unit Parameter Value: Unit:

Earth Radius 6.378,14 km Period 102,989 minutes

Height of Apogee (ha) 1.450,0 km dw/dt -1,4917 deg./day

Height of Perigee (hp) 350,0 km dW/dt -2,0664 deg./day

Semi-Major Axis (a) 7.278,1 km Mean Orbit Altitude 900,00 km

Eccentricity (e) 0,075569 Mean Orbit Radius 7.278,14 km

Inclination (I) 71,00 degrees

Sun Synchronous

Inclination

98,93 degrees

Argument of Perigee

(w)

180,0 degrees

Elevation Angle (δ)

45,0 degrees

R.A.A.N. (W) 7,13482 degrees Slant Range (S) 1.202,33 km.

Mean Anomaly (M) 0,00 degrees

Fig. 3.2. Slant Range to Spacecraft vs. Elevation

Angle according with the variables in Table 3.4.

1 2 3 4 5 6 7 8

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