Trimble Outdoors 58052-00 Benutzerhandbuch

Copernicus GPS Receiver 1 5 3

TRIMBLE STANDARD INTERFACE PROTOCOL (TSIP) A

The receiver codephase is expressed in 1/16th of a C/A code chip. This corresponds
to:

1/16 x C/A code chip = 977.517ns/16 = 61.0948 ns

= 61.0948 x speed of light, m/s

= 18.3158 meter

Note – The receiver occasionally adjusts its clock to maintain time accuracy within 1
msec. At this time, all pseudo-range values for all satellites are adjusted upward or
downward by one millisecond. Report packet 0x5A checks packet 0x83 or 0x84 for
clock bias.

Report Packet 0x5F

For Trimble diagnostic use only, please ignore.

Report Packet 0x5C - Satellite Tracking Status

This packet provides tracking status data for a specified satellite. Some of the
information is very implementation-dependent and is provided mainly for diagnostic
purposes. The receiver sends this packet in response to Packet

3C. The data format

is shown below.

Table A.46

Report Packet 0x5C Data Formats

Byte

Bit

Item

Type

Value

Definition

Satellite
PRN
number

UINT8

number
1 - 32

0-2

reserved

Bits

reserved

3-7

Channel

Bits

0-11

Acquisition
flag

UINT8

0
1
2

Never acquired
Tracking
Re-opened search

Ephemeris
flag

UINT8

0
1

Flag not set
Ephemeris is decoded

4-7

Signal
level

Single

Same as in Packet 0x47

8-11

GPS time
of last
measurem
ent

Single

<0
>0

No measurements have been taken.
Center of the last measurement
taken from this satellite.

12-15

Elevation

Singles

radians

Approximate elevation of this
satellite above the horizon.
Updated about every 15 sec.s. Used
for searching and computing
measurement correction factors.