Trimble Outdoors 58052-00 Benutzerhandbuch

Copernicus GPS Receiver     2 2 9

NMEA 0183     C

This sentence can be used to query or set ephemeris data for a specific satellite. Since 
the maximum number of bytes that can be contained in a single NMEA sentence is 
less than the total ephemeris data length, the ephemeris data must be sent in three 
sentences. The three sentences have to be sent or received together in correct 
sequence.

Following is the query format:

$PTNLQEP,xx*hh<CR><LF>

After receiving the query, the receiver should send out three messages. Following is 
the first message of ephemeris format:

$PTNLaEP,1,xx,x.x,x.x,hh,hh,hh,hh,hhh,hh,hhhh,hh,h

hhh,hhhhhh,x.x*hh<CR><LF>

Following is the second sentence of ephemeris format:

$PTNLaEP,2,xx,hh,hh,hhhh,hhhh,hhhhhhhh,hhhh,hhhhhhhh,hhhh,hhhhhhhh,hhhh*
hh<CR><LF>

Table C.19

Ephemeris Query Format

Field

Description

Q

 

Query

xx

 Satellite

Table C.20

Ephemeris Message Format

Field

Description

a

 Mode (S = set; R = Response)

1

Message number for EP, message 1 must be sent or received before 
message 2, and message 2 must be sent or received before message 3, 
and all three messages must be sent together with correct sequence

xx

 Satellite id

x.x

 T_ephem, This is a double precision floating point number. 

x.x

 Week number for health, variable length integer, 4 digits maximum.

hh

 CodeL2, HEX data conforming to GPS ICD 200.

hh

 L2Pdata, HEX data conforming to GPS ICD 200.

hh

 Svacc_raw, HEX data conforming to GPS ICD 200.

hh

 SV_health, HEX data conforming to GPS ICD 200.

hhh

 IODC, HEX data conforming to GPS ICD 200.

hh

 T_GD, HEX data conforming to GPS ICD 200.

hhhh

 T_oc, HEX data conforming to GPS ICD 200.

hh

 A_f2, HEX data conforming to GPS ICD 200.

hhhh

 A_f1, HEX data conforming to GPS ICD 200.

hhhhhh

 A_f0, HEX data conforming to GPS ICD 200.