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| datatrak:signal [2020/05/31 17:31] – [Sync and timing] philpem | datatrak:signal [2022/04/26 15:28] – philpem |
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| ====== Datatrak signal -- technical details ====== | ====== Signal format -- technical details ====== |
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| At the top level, the Datatrak signal consists of //sync data// and a series of time-multiplexed //navigation slots//. Each transmitter is assigned one or more //slots//, which are either //master slots// (the transmitter generates the slot without a reference) or //slave slots// (synchronised to a master slot). | At the top level, the Datatrak signal consists of //sync data// and a series of time-multiplexed //navigation slots//. Each transmitter is assigned one or more //slots//, which are either //master slots// (the transmitter generates the slot without a reference) or //slave slots// (synchronised to a master slot). |
| ==== Nav slots ==== | ==== Nav slots ==== |
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| :!: TODO | :!: This is incomplete |
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| During the navigation "slots" two signals are transmitted: first one 40Hz higher than the centre frequency, then one 40Hz below it. These frequencies are known as the "+" (higher frequency) and "-" (lower frequency) signals. | During the navigation "slots" two signals are transmitted: first one 40Hz higher than the centre frequency, then one 40Hz below it. These frequencies are known as the "+" (higher frequency) and "-" (lower frequency) signals. |
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