- Tests Day One
We tested the device with a Dell Axim X50v. We recorded all produced data for a pre-selected route with VisualGPSce (free edition) and later analyzed it with GPSLog. In order to measure the TTFF tests ("Time to First Fix" which is the time it takes for a GPS to determine its current position), we used GPSInfo "Cold Start" function. All tests ran continuously, under the same environmental conditions (night, clear sky, 15° C ) and driving in an Audi A4, 2004.
|
Globalsat BC-337 |
Haicom HI-305III |
|
Time to First Fix (TTFF) |
Secs |
48.5 sec |
42.33 sec |
|
Fix |
Invalid |
6.6 |
0 |
|
2D |
7.0 |
1.7 |
3D
|
86.4 |
98.3 |
|
Satellites |
Average (in view) |
10.00 |
8.00 |
|
Average (in use) |
4.14 |
5.34 |
|
Average Signal Level (in dB) |
Maximum per Satellite |
39.40 |
40.50 |
|
Average per Satellite |
32.04 |
33.12 |
The Haicome HI-305III performed well in all tests. Its TTFF time was shorter than the BC-337s' and the device had a very low percentage (%) of Invalid and 2D fix. The Average Satellites in "view", were higher than with the Globalsat BC-337. Lastly, the Average Signal Levels (max/average) per satellite were better than with the BC-337.
- Tests Day Two
Same testbed, Dell Axim X50v, VisualGPSce (free edition), GPSLog and GPSInfo. All tests ran continuously, under the same environmental conditions (day, cloudy weather, 4° C ) and driving in an Audi A4, 2004. This time we used an external antenna to see if there is any difference.
|
Globalsat BC-337 + antenna |
Haicom HI-305III + antenna |
Time to First Fix (TTFF) |
Secs |
29 sec |
37 sec |
Fix |
Invalid |
0 |
0 |
2D |
0 |
0 |
|
100 |
100 |
Satellites |
Average (in view) |
10.00 |
9.17 |
Average (in use) |
6.91 |
6.94 |
Average Signal Level (in dB) |
Maximum per Satellite |
45.57 |
43.50 |
Average per Satellite |
36.89 |
36.01 |
Using an external antenna gave us different results, with the BC-337 performing better. Both devices lowered their TTFF times, had higher satellites "in use" and Average Signal Levels (max/average) per satellite, compared with the antenna-less results.
