I don't even know what GPS receiver you are using, so I can't answer
that. But if the information is not available then I would suggest
setting those fields to zero.
Mike
> Thanks for you help. And can you tell me how to set ephemeris_mask and
> almanac_mask since the gps receiver don't report which satellite has
> ephemeris_mask and almanac_mask .
>
> On 3月18日, 下午10时48分, Mike Lockwood <lockw...@android.com> wrote:
>> The ephemeris_mask, almanac_mask and used_in_fix_mask are bit fields
>> based on the PRN for the satellites. The bit numbers are one less
>> than the PRN number, since the PRNs are numbered starting at 1.
>>
>> For example, bit 0 of ephemeris_mask is set if we have ephemeris for
>> PRN 1, bit 1 is set if we have ephemeris for PRN 2, etc.
>>
>> Mike
>>
>> On Wed, Mar 18, 2009 at 4:20 AM, liaojunsh...@gmail.com
>>
>>
>>
>>
>>
>> <liaojunsh...@gmail.com> wrote:
>>
>> > Hi,
>>
>> > I am working on porting gps and use NXP gps module for gps position.
>> > It works fine, but i faced a problem that i can not report a correct
>> > gps status data to GpsLocationProvider.java via gps_sv_status_callback
>> > funtion. because in structure GpsSvStatus{
>> > /** number of SVs currently visible */
>> > int num_svs;
>>
>> > /** Array of space vehicle info */
>> > GpsSvInfo sv_list[GPS_MAX_SVS];
>>
>> > /** bit mask indicating which SVs have ephemeris data */
>> > uint32_t ephemeris_mask;
>>
>> > /** bit mask indicating which SVs have almanac data */
>> > uint32_t almanac_mask;
>>
>> > /**
>> > * bit mask indicating which SVs were used for
>> > * computing the most recent position fix
>> > */
>> > uint32_t used_in_fix_mask;
>> > }, i do not know what a value i should give to
>> > ephemeris_mask,almanac_mask,used_in_fix_mask.
>>
>> > I can get the gps data from the gps module, and bellow is my debug
>> > info:
>> > sending fix lat=22.5423 lon=113.946 altitude=-138.569 time=Wed Mar 18
>> > 07:32:17 2009
>> > D/GpsLocationProvider( 700): reportLocation lat: 22.54233323461825
>> > long: 113.94645713861372 timestamp: 1237361537
>> > D/GpsLocationProvider( 700):
>> > android_location_GpsLocationProvider_wait_for_event
>> > Satellites in view count: 14, for used: 9
>> > Satellites in view 0: prn: 9 , snr: 20.000000, ele:75.000000, azi:
>> > 97.000000 , for fix: 1
>> > Satellites in view 1: prn: 21 , snr: 28.000000, ele:68.000000, azi:
>> > 275.000000 , for fix: 1
>> > Satellites in view 2: prn: 24 , snr: 22.000000, ele:52.000000, azi:
>> > 168.000000 , for fix: 1
>> > Satellites in view 3: prn: 18 , snr: 23.000000, ele:40.000000, azi:
>> > 331.000000 , for fix: 1
>> > Satellites in view 4: prn: 15 , snr: 18.000000, ele:28.000000, azi:
>> > 39.000000 , for fix: 1
>> > Satellites in view 5: prn: 26 , snr: 24.000000, ele:19.000000, azi:
>> > 42.000000 , for fix: 0
>> > Satellites in view 6: prn: 27 , snr: 22.000000, ele:16.000000, azi:
>> > 39.000000 , for fix: 1
>> > Satellites in view 7: prn: 5 , snr: 0.000000, ele:15.000000, azi:
>> > 159.000000 , for fix: 0
>> > Satellites in view 8: prn: 22 , snr: 42.000000, ele:15.000000, azi:
>> > 311.000000 , for fix: 1
>> > Satellites in view 9: prn: 12 , snr: 0.000000, ele:13.000000, azi:
>> > 148.000000 , for fix: 0
>> > Satellites in view 10: prn: 14 , snr: 43.000000, ele:13.000000, azi:
>> > 256.000000 , for fix: 1
>> > Satellites in view 11: prn: 10 , snr: 0.000000, ele:11.000000, azi:
>> > 104.000000 , for fix: 0
>> > Satellites in view 12: prn: 29 , snr: 39.000000, ele:11.000000, azi:
>> > 203.000000 , for fix: 1
>> > Satellites in view 13: prn: 30 , snr: 0.000000, ele:4.000000, azi:
>> > 180.000000 , for fix: 0
>> > D/GpsLocationProvider( 700):
>> > android_location_GpsLocationProvider_wait_for_event
>>
>> > Can anyone tell me how to give a correct value to
>> > ephemeris_mask,almanac_mask and used_in_fix_mask that base on the
>> > above debug info .
>>
>> --
>> Mike Lockwood
>> Google android team- 隐藏被引用文字 -
>>
>> - 显示引用的文字 -
> >
>
--
Mike Lockwood
Google android team
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