Garmin GPS 17HVS - Receiver Module Technische Daten - Seite 36
Blättern Sie online oder laden Sie pdf Technische Daten für GPS-System für die Schifffahrt Garmin GPS 17HVS - Receiver Module herunter. Garmin GPS 17HVS - Receiver Module 40 Seiten. Declaration of conformity
Auch für Garmin GPS 17HVS - Receiver Module: Installationsanleitung Handbuch (12 seiten), Technische Daten (34 seiten), Installationshandbuch (16 seiten), Technische Daten (37 seiten), Konformitätserklärung (2 seiten)
Seite drucken
An example function to do the parsing is shown below. Note that the double data types are converted by the
function cnvt_ieee_double(). This function merely swaps the upper and lower words of the double.
This is necessary on GPS 15, 16, 17 series sensors due to a compatibility issue with the IEEE floating point
standard): In this example, the array m_TempArray contains the data portion of the ephemeris packet
(with DLE stuffing removed).
/****************************************************************************
*
*
PROCEDURE NAME:
*
copyData - ephemeris data unpacker
*
*
DESCRIPTION:
*
unpacks data from ephemeris packet DATA field after extraneous DLEs
*
have been removed.
*
integer type.
*
****************************************************************************/
void GPM_ephList::copyData
(
GPM_ephData* pTemp
)
{
pTemp->EphStruct.wn
pTemp->EphStruct.toc = *(float*)&m_TempArray[IDX_EPH_TOC];
pTemp->EphStruct.toe = *(float*)&m_TempArray[IDX_EPH_TOE];
pTemp->EphStruct.af0 = *(float*)&m_TempArray[IDX_EPH_AF0];
pTemp->EphStruct.af1 = *(float*)&m_TempArray[IDX_EPH_AF1];
pTemp->EphStruct.af2 = *(float*)&m_TempArray[IDX_EPH_AF2];
pTemp->EphStruct.ura = *(float*)&m_TempArray[IDX_EPH_URA];
cnvt_ieee_double((long *)&m_TempArray[IDX_EPH_E]);
pTemp->EphStruct.e = *(double*)&m_TempArray[IDX_EPH_E];
cnvt_ieee_double((long *)&m_TempArray[IDX_EPH_SQRTA]);
pTemp->EphStruct.sqrta = *(double*)&m_TempArray[IDX_EPH_SQRTA];
cnvt_ieee_double((long *)&m_TempArray[IDX_EPH_DN]);
pTemp->EphStruct.dn = *(double*)&m_TempArray[IDX_EPH_DN];
cnvt_ieee_double((long *)&m_TempArray[IDX_EPH_M0]);
pTemp->EphStruct.m0 = *(double*)&m_TempArray[IDX_EPH_M0];
cnvt_ieee_double((long *)&m_TempArray[IDX_EPH_W]);
pTemp->EphStruct.w = *(double*)&m_TempArray[IDX_EPH_W];
cnvt_ieee_double((long *)&m_TempArray[IDX_EPH_OMG0]);
pTemp->EphStruct.omg0 = *(double*)&m_TempArray[IDX_EPH_OMG0];
cnvt_ieee_double((long *)&m_TempArray[IDX_EPH_I0]);
pTemp->EphStruct.i0 = *(double*)&m_TempArray[IDX_EPH_I0];
pTemp->EphStruct.odot = *(float*)&m_TempArray[IDX_EPH_ODOT];
pTemp->EphStruct.idot = *(float*)&m_TempArray[IDX_EPH_IDOT];
pTemp->EphStruct.cus = *(float*)&m_TempArray[IDX_EPH_CUS];
pTemp->EphStruct.cuc = *(float*)&m_TempArray[IDX_EPH_CUC];
pTemp->EphStruct.cis = *(float*)&m_TempArray[IDX_EPH_CIS];
pTemp->EphStruct.cic = *(float*)&m_TempArray[IDX_EPH_CIC];
pTemp->EphStruct.crs = *(float*)&m_TempArray[IDX_EPH_CRS];
pTemp->EphStruct.crc = *(float*)&m_TempArray[IDX_EPH_CRC];
pTemp->EphStruct.iod = *(unsigned char*)&m_TempArray[IDX_EPH_IOD];
return;
}
/* copyData */
190-00228-20
Note that sint16 refers to a signed 16-bit
/* ephemeris data unpacker
/* pointer to ephemeris data array
= *(sint16*)&m_TempArray[IDX_EPH_WN];
GPS 16/17 Technical Specifications
Page 32
*/
*/
Rev. C