Hi, mmm I think we are not understanding each other.
What do you mean with GPS? If you mean Global Positioning System then what is the relationship with a GPS? Are you interested in the RSSI or in the Time of Arrival? In the former no GPS is necessary if the anchors position are known and relative references are used. In the latter a specific radio is required. But I do not see where to use the GPS... For extracting the RSSI, you have to use the component of your radio (e.g. CC2420PacketC.nc or something like that) and use the getrssi function passing the pointer to the received packet. Apart of the tutorials, I encourage you to get into every directory of the TinyOS folder and find the different components, and the functions they offer. Good luck! Sergio On Sun, Feb 5, 2012 at 7:31 PM, obinna oguejiofor <[email protected]> wrote: > Hi > you are correct but am still having some challenges like (1) how can a > make an ordinary node(telosb mote) to become a beacon node without using > GPS (2) How can i measure the RSSI when two motes are communicating. > > your timely answers will be welcomed > > many thanks > Obinna > > --- On *Thu, 2/2/12, Sergio Valcarcel <[email protected]>* wrote: > > > From: Sergio Valcarcel <[email protected]> > Subject: Re: [Tinyos-help] localisation of wireless sensor network using > RSSI > To: "obinna oguejiofor" <[email protected]> > Cc: [email protected] > Date: Thursday, February 2, 2012, 8:12 AM > > > Hi Obinna, > > I do not quite understand your question. > > On one hand, IEEE 802.15.4 is a Medium Access Control protocol, i.e. it is > in charge of sharing the air (more specifically the RF spectrum) to enable > many users communicate in the same channel at almost the same time. > > On the other hand, localization through RSSI means that you have to > estimate the distance between nodes using the RSSI measurement and a model > of the channel. Then you use some algorithm (like simple triangularization) > and find the position of the node that is transmitting the beacons. Note > that you need at least 3 anchor nodes receiving with known positions, and > another one which is transmitting the beacons. > > Therefore rather than configuring the MAC you just have to take the RSSI > info from the packet. > > Cheers! > Sergio > > On Tue, Jan 31, 2012 at 1:58 PM, obinna oguejiofor > <[email protected]<http://mc/[email protected]> > > wrote: > > HI > I am writing my masters thesis on localisation of wireless sensor networks > using RSSI , please can anyone tell me how i can manually configure my IEEE > 802.15.4 telos B mote inother for it to be aware of its location without > using gps. > > _______________________________________________ > Tinyos-help mailing list > [email protected]<http://mc/[email protected]> > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > >
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