[time-nuts] GPS SV74/PRN04 now trackable...

[opronningen at gmail.com]

Tracking it on L1C/A, L1P(Y), L2C and L2P(Y) here on a Septentrio PolaRX4TR
- no L5-capable antenna, so nothing on L5, though. As you say, marked as
unhealthy.

Ole

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Fra: time-nuts <time-nuts-bounces at lists.febo.com> På vegne av J Grizzard
Sendt: søndag 3. november 2019 04:01
Til: time-nuts at lists.febo.com
Emne: [time-nuts] GPS SV74/PRN04 now trackable...

Since I figure several people here will be interested, I thought I'd note
that the first of the new GPS Block III satellites (SV74, launched last
December) has been assigned PRN04, and is now transmitting the L1 ranging
code and valid LNAV frames. It's currently set unhealthy, so most GPS
devices won't show it yet, but it's definitely out there now.

I don't know if it's doing anything with L2C (or if it's sending CNAV frames
yet), mostly because I haven't finished writing my CNAV parser, but I
suspect it probably is.

Anyhow, from my LNAV parser:

GnssMeta: {
   Page: (uint8) 18,
   Subframe: (uint8) 1,
   SvId: (uint8) 4
},
TLM: {
   Preamble: (uint8) 139,
   Message: (uint16) 10768,
   Integrity: (bool) false,
   Reserved: (bool) false,
},
HOW: {
   TowCountTrunc: (uint32) 86961,
   Alert: (bool) false,
   Antispoof: (bool) true,
   SubframeNumber: (uint8) 1,
},
Data: {
   Wn: (uint16) 28,
   L2_Codes: (uint8) 1,
   UraIndex: (uint8) 0,
   UraMeters: (float32) 0,
   Health: (uint8) 63,
   Iodc: (uint16) 53,
   L2_P_Data: (bool) false,
}

...I should really get around to writing that CNAV parser and such.

-j

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