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Each data member of the ephemeris data structure is indexed into the data array of the ephemeris packet

and cast as the appropriate data type. The indices are as follows (note that they correlate to the data

members of the structure respectively):

#define IDX_EPH_WN

#define IDX_EPH_TOC

#define IDX_EPH_TOE

#define IDX_EPH_AF0

#define IDX_EPH_AF1

#define IDX_EPH_AF2

#define IDX_EPH_URA

#define IDX_EPH_E

#define IDX_EPH_SQRTA

#define IDX_EPH_DN

#define IDX_EPH_M0

#define IDX_EPH_W

#define IDX_EPH_OMG0

#define IDX_EPH_I0

#define IDX_EPH_ODOT

#define IDX_EPH_IDOT

#define IDX_EPH_CUS

#define IDX_EPH_CUC

#define IDX_EPH_CIS

#define IDX_EPH_CIC

#define IDX_EPH_CRS

#define IDX_EPH_CRC

#define IDX_EPH_IOD

The last packet will be a "download complete" packet that will look like this:

TX Packet: Download Complete

Byte Description

Delimiter

Download Complete ID

Number of bytes in data

Ephemeris Download ID

Pad

Checksum calculation

Delimiter

End of packet

After properly acknowledging this packet (ACK the IOP_DL_CMPLT ID), the ephemeris download is

complete.

190-00228-20

100

104

108

112

116

Name

DLE

IOP_DL_CMPLT

SIZE

IOP_DOWN_LOAD_EPH

DATA

CHKSUM

DLE

ETX

GPS 16/17 Technical Specifications

Page 33

HEX Value

0x10

0x0c

0x02

0x5D

0x00

----

0x10

0x03

Rev. C