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Friday, February 03, 2006
Haicom 305-III

4. The Tests

- 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

3D

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.




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