User:Adamgann/sandbox

The Automatic Packet Reporting System (APRS) is a digital communication system for real-time information exchange between amateur radio users in a local area. First developed by Bob Bruninga in the late 1980's, the system has grown to 40,000 users (SOURCE:APRS by Bob). APRS handles the relay of many types of information, weather, traffic, alerts, and even text messaging. The most common type of data handled by the network is the GPS position of a mobile station.

By using a network of digital repeaters (digipeaters) and internet connected receivers (i-gates) the system is able to relay this information to anywhere in the world without the use of a cellular network. Being a unique communication network, APRS has unique challenges and solutions to problems that will be discussed here.

The Short Answer
-AX standard. All nodes operating independently.

-Anatomy of an APRS GPS packet

-Digipeaters, i-gates, and mobile stations

- How we ensure that a packet gets received at an internet connected station.

The Long Answer
- Digipeaters and analysis of PATH setting (if we have a path of WIDEn-N and each digi can hear x others, how many total copies over network)? (source: The new n-paradigm, fixing digis)

- Tragedy of the Commons with wide path in dense area. LA as example, do calculation of number of repeat messages. (source: fixing la)

-Aloha circle calculation with analysis

-Presence and Urgency Bit

-

2-Way Communication Protocol
Describe why 2 way using a simple send-ack doesn't work. Talk about what ARPSdos and Xastir use (decaying delay algorithm, automatic repeat of ack, embed ack in sent message). Analysis of how this helps transmission rate.