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package nmea
const (
// TypeTLL type of TLL sentence for Target latitude and longitude
TypeTLL = "TLL"
// RadarTargetLost is used when target is lost
RadarTargetLost = "L"
// RadarTargetAcquisition is used when target is acquired
RadarTargetAcquisition = "Q"
// RadarTargetTracking is used when tracking target
RadarTargetTracking = "T"
)
// TLL - Target latitude and longitude
// https://gpsd.gitlab.io/gpsd/NMEA.html#_tll_target_latitude_and_longitude
// https://github.com/nohal/OpenCPN/wiki/ARPA-targets-tracking-implementation#tll---target-latitude-and-longitude
//
// Format: $--TLL,xx,llll.ll,a,yyyyy.yy,a,c--c,hhmmss.ss,a,a*hh<CR><LF>
// Example: $RATLL,,3647.422,N,01432.592,E,,,,*58
type TLL struct {
BaseSentence
TargetNumber int64 // Target number 00 – 99
TargetLatitude float64 // Target latitude + N/S
TargetLongitude float64 // Target longitude + E/W
TargetName string // Target name
TimeUTC Time // UTC of data, hh is hours, mm is minutes, ss.ss is seconds.
TargetStatus string // Target status (L=lost, Q=acquisition, T=tracking)
ReferenceTarget string // Reference target, R= reference target; null (,,)= otherwise
}
// newTLL constructor
func newTLL(s BaseSentence) (Sentence, error) {
p := NewParser(s)
p.AssertType(TypeTLL)
return TLL{
BaseSentence: s,
TargetNumber: p.Int64(0, "target number"),
TargetLatitude: p.LatLong(1, 2, "latitude"),
TargetLongitude: p.LatLong(3, 4, "longitude"),
TargetName: p.String(5, "target name"),
TimeUTC: p.Time(6, "UTC time"),
TargetStatus: p.EnumString(7, "target status", RadarTargetLost, RadarTargetAcquisition, RadarTargetTracking),
ReferenceTarget: p.EnumString(8, "reference target", "R"),
}, p.Err()
}
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