...capitolo 10.1.2 WASS delle mie considerazioni
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mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Times New Roman","serif";} </style> <![endif]--> Possiamo scegliere se attivare o non il sistema WAAS/EGNOSS .
Il sistema WAAS merita di alcune considerazioni.
Con WAAS possiamo abilitare la ricezione da due distinti sistemi satellitari a scapito di un consumo energetico più dispendioso ma che offre una precisione migliore, personalmente sono dellopinione di abilitare detta possibilità. In Europa si attiva solo EGNOS, mentre il WAAS è esclusivamente Americano. Non è stato tradotto per intero ma se andiamo ad attivare la lingua inglese nella finestra di dialogo troveremo WAAS/EGNOS. Non è un vero e proprio sistema satellitare, ma ha una correzione del segnale detto DGPS. La precisione del rilevamento, intesa come maggior precisione del segnale GPS, non ha nulla a che fare con l'aumentare o meno la frequenza della registrazione della traccia o delle impostazioni sopra citate ad eccezione appunto dell'attivazione o meno del segnale EGNOS. Le condizioni che possono influire sulla qualità del segnale GPS ed EGNOS (dove qualità del segnale è sempre direttamente proporzionale a una maggior precisione e al numero di satelliti "visibili"!) sono molte:
- Posizione dello strumento durante la marcia.
Già solo il nostro corpo, gli indumenti, lo
zaino possono interferire con il segnale inviato dai satelliti.
Quando si deve fare "rilevazioni" di precisione è consigliabile un'antenna che esce dallo zaino e supera la testa, in modo che io stesso non sia da ostacolo al segnale.
- Posizione dei satelliti rispetto alla nostra location.
I satelliti devono sempre essere "visti" direttamente dall'antenna dello strumento, quindi se siamo in grossi canyon, in profondi avvallamenti o in zone comunque in cui l'orizzonte non è libero a 360 gradi inevitabilmente perdiamo la ricezione di qualche satellite o riceviamo dei segnali di "riflesso", che disturbano enormemente la qualità. Molto delicata è pure la ricezione del segnale in presenza di un fitto fogliame, ancora peggiorativa è la situazione in caso di pioggia o formazione di H2O sul fogliame.
In oltre a volte ci sono situazioni critiche a determinati orari del giorno, dove la costellazione dei satelliti potrebbe essere più coperta da pareti laterali o situazioni simili. Ad esempio in certi momenti della giornata si avrà una precisione di 15/20mt perché in quel momento i satelliti visibili sono pochi.
· Riflessi (multi path)
Il segnale riflesso da grosse superfici (soprattutto lisce: pareti rocciose, laghi, palazzi) crea molto disturbo al segnale "primario" e quindi la precisione diminuisce enormemente, sia che sia attivo o meno il sistema 'EGNOS.
Anzi potrebbe darsi che per assurdo in casi estremi quest'ultimo possa dare problemi maggiori proprio perché corregge un errore, ma non è in grado di correggere i "riflessi" e quindi potrebbe mettere maggiormente in crisi il ricevitore.
In linea di massima si può affermare con una certa sicurezza che avere attivo l'EGNOS è sempre migliorativo per la qualità di ricezione. Quindi consiglio sempre di mantenerlo attivo. Ma devo dire che si possono presentare casi in cui detta attivazione possa portare svantaggi (casi rari). In quel caso basta fare delle prove e se si capisce che peggiora la situazione allora si disabilita.
...non hai da fare nessuna calibrazione o taratura...studio dove ti stai muovendo e se hai il cielo libero...