**Italian GPS Network:\
Operational activity at the \"Centro di Geodesia Spaziale\" of the
Agenzia Spaziale Italiana**

**F. Vespe**

## Agenzia Spaziale Italiana

*Centro di Geodesia Spaziale -Matera-*

**F. Ambrico, G. Colucci, D. Del Rosso, R. Faccia, G. Ramundo**

*Telespazio S.p.A.*

*Centro di Geodesia Spaziale -Matera-*

1.  **Introduction**

The GPS activities at the Italian Space Agency\'s (ASI) Space Geodesy
Center (CGS) began in 1990 when a fixed SNR-8 Rogue receiver was. In
1995 four new stations, also based on Turborogue receivers, were set up
in Cagliari, Medicina, Noto and Venezia. In 1998 the Genova site began
operational; in 1999 the Lampedusa and L'Aquila sites were set up, and
in May 2000 the Camerino site became operational. These sites were
equipped with Trimble 4000SSI receivers.

2.  **The Italian GPS Fiducial Network**

The GPS receivers of the fiducial network have been installed in sites
of geophysical interest. In particular Cagliari, Medicina and Noto where
selected because they are connected to the VLBI and/or SLR global
networks; Venezia and Genova were selected in order to connect the GPS
network to the measurements of the mean sea level performed through the
tide gauge. Lampedusa was selected because is situated on the African
plate.

The following figure shows the lay-out of the Italian GPS Fiducial
Network including ASI sites as well as other sites operated by different
institutions or agencies.

All data are archived in Matera on Geodetic Data Archive Facility
(GeoDAF) and also sent to EUREF or IGS data centers.

#### GeoDAF web page: [http://geodaf.mt.asi.it](http://geodaf.mt.asi.it/)

###### GeoDAF anonymous ftp: geodaf.mt.asi.it 

# *Figure 1 -- Italian G.P.S. Network map*

> **3. Data acquisition activities**

ASI sites are remotely controlled from Matera via modem connection. The
Matera receiver downloads data directly to a P.C. connected by serial
cable. The data collected by the receiver are transferred on a daily
basis at GeoDAF. Since 1995 other data acquired by GPS receiver
installed and managed by external agencies, are archived and maintained
in the GeoDAF web server. Matera, Cagliari, Medicina, Padova and Torino
record GPS hourly data.

The Matera site records the meteo data every hour.

The following figure shows all data archived on GeoDAF server. These
data are on line more than six months, however, the off-line data are
available sending a request to this e-mail address: *geodaf@asi.it*.

+---+------------+--------+------------------------+-----+-------+-----+
| * | # ***      | *      | ## **Agency**          | *** | ### * | *   |
| * | Station*** | **Code |                        | 1st | *Netw | **N |
| * |            | (link\ |                        | f   | ork** | RT\ |
|   |            | to     |                        | ile |       | (h  |
| * |            | SiteL  |                        | in\ |       | our |
| * |            | og)*** |                        | Geo |       | ly) |
| * |            |        |                        | DAF |       | *** |
|   |            |        |                        | *** |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | *Matera*   | *mate* | ####### ASI            | *9  | *IGS* | *y  |
| 1 |            |        |                        | 4/1 |       | es* |
| * |            |        |                        | 81* |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | *Noto*     | *noto* | *ASI*                  | *9  | *IGS* |     |
| 2 |            |        |                        | 5/0 |       |     |
| * |            |        |                        | 34* |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | *Cagliari* | *cagl* | *ASI*                  | *9  | *IGS* | *y  |
| 3 |            |        |                        | 5/0 |       | es* |
| * |            |        |                        | 93* |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | *Venezia*  | *vene* | *ASI*                  | *9  | *E    |     |
| 4 |            |        |                        | 5/0 | UREF* |     |
| * |            |        |                        | 82* |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | *Padova*   | *upad* | *Università di Padova* | *9  | *IGS* |     |
| 5 |            |        |                        | 5/1 |       |     |
| * |            |        |                        | 36* |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | *Medicina* | *medi* | *ASI*                  | *9  | *IGS* | *y  |
| 6 |            |        |                        | 5/2 |       | es* |
| * |            |        |                        | 06* |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | *Genova*   | *geno* | *ASI*                  | *9  | *IGS* |     |
| 7 |            |        |                        | 7/0 |       |     |
| * |            |        |                        | 85* |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | #          | *tori* | *Politecnico di        | *9  | *E    | *y  |
| 8 | ### Torino |        | Torino*                | 7/0 | UREF* | es* |
| * |            |        |                        | 91* |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | ##         | *bzrg* | *Regione Autonoma      | *9  | *E    |     |
| 9 | ## Bolzano |        | Trentino Alto Adige*   | 8/0 | UREF* |     |
| * |            |        |                        | 01* |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | ##         | *cose* | *CNR IRPI Cosenza*     | *9  |       |     |
| 1 | ## Cosenza |        |                        | 8/1 |       |     |
| 0 |            |        |                        | 26* |       |     |
| * |            |        |                        |     |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | ##         | *unpg* | *Università di         | *9  | *E    |     |
| 1 | ## Perugia |        | Perugia*               | 8/1 | UREF* |     |
| 1 |            |        |                        | 36* |       |     |
| * |            |        |                        |     |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | ####       | *vluc* | ##### *ITG \"Cenni\    | *9  |       |     |
| 1 |  Vallo del |        | " Vallo della Lucania* | 8/2 |       |     |
| 2 | la Lucania |        |                        | 15* |       |     |
| * |            |        |                        |     |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | #### Prato | *prat* | *Università di         | *9  |       |     |
| 1 |            |        | Firenze*               | 8/2 |       |     |
| 3 |            |        |                        | 69* |       |     |
| * |            |        |                        |     |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | *          | *lamp* | *ASI*                  | *9  | *E    |     |
| 1 | Lampedusa* |        |                        | 9/0 | UREF* |     |
| 4 |            |        |                        | 87* |       |     |
| * |            |        |                        |     |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | *          | *aqui* | *ASI*                  | *9  |       |     |
| 1 | L\'Aquila* |        |                        | 9/1 |       |     |
| 5 |            |        |                        | 65* |       |     |
| * |            |        |                        |     |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | *Camerino* | *came* | *ASI*                  | *   | *E    |     |
| 1 |            |        |                        | 001 | UREF* |     |
| 6 |            |        |                        | 18* |       |     |
| * |            |        |                        |     |       |     |
+---+------------+--------+------------------------+-----+-------+-----+
| * | *Novara*   | *nova* | *Comune di Novara*     | *0  |       |     |
| 1 |            |        |                        | 0/1 |       |     |
| 7 |            |        |                        | 66* |       |     |
| * |            |        |                        |     |       |     |
+---+------------+--------+------------------------+-----+-------+-----+

### 

### Figure 2 -- GeoDAF archive