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Echolot Ranging Project - Wireless communication

This section presents the aspects of the involved radiocommunication.

Radiolink characterizationNovember 20th, 2011

foggy
Fig. 1: Foggy lake Außenmühle in the evening of Nov 20th, 2011.

On this cold and foggy day (cf. Fig. 1), a friend of mine and I went out to challenge the performance of the RF-modules at the lake Außenmühle in Harburg's recreation area.


radiolink map
Fig. 2: Map of line-of-sight (LOS) for measured radiolinks.

The results as shown in Table 1 are acutally quite promising. It seems to be possible to keep the radiolink up during operation on the entire lake.
Locating the base station somewhere near position #5 would place it on a hill, additionally. This may improve the reception.

Table 1: Measurements of transmitted and lost packages as well as RSSI for 10dBm radiated power.
Position Distance [m] pkg success pkg lost RSSI @Pos(Ref) [dBm]
3132 220-75
4258 220-78
5534 220-92
6735 822-98
71042 011SNR too low