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package nmea
const (
// TypeTTD type of TTD sentence for tracked target data.
TypeTTD = "TTD"
)
// TTD is sentence used by radars to transmit tracked targets data.
// https://fcc.report/FCC-ID/ADB9ZWRTR100/2768717.pdf (page 1) FURUNO MARINE RADAR, model FAR-15XX manual
//
// Format: !--TTD,hh,hh,x,s--s,x*hh<CR><LF>
// Example: !RATTD,1A,01,1,177KQJ5000G?tO`K>RA1wUbN0TKH,0*5C
type TTD struct {
BaseSentence
// NumFragments is total hex number of fragments/sentences need to transfer the message (1 - FF)
NumFragments int64 // 0
// FragmentNumber is current fragment/sentence number (1 - FF)
FragmentNumber int64 // 1
// MessageID is sequential message identifier (0 - 9, null)
MessageID int64 // 2
// Payload is encapsulated tracked target data (6 bit binary-converted data)
Payload []byte // 3
// 4 - Number of fill bits (0 - 5)
}
// newTTD constructor
func newTTD(s BaseSentence) (Sentence, error) {
p := NewParser(s)
p.AssertType(TypeTTD)
m := TTD{
BaseSentence: s,
NumFragments: p.HexInt64(0, "number of fragments"),
FragmentNumber: p.HexInt64(1, "fragment number"),
MessageID: p.Int64(2, "sequence number"),
Payload: p.SixBitASCIIArmour(3, int(p.Int64(4, "number of padding bits")), "payload"),
}
return m, p.Err()
}
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