Update Rates - Operating Environment
Update Rates
Manufacturer specifications:
One receiver: 81 outputs/second
Two receivers: 40 outputs/second
Three receivers: 27 outputs/second
Our results:
The procedure was the same for all measurement blocks. In each case, we measured the time taken to see a change on the X axis of sensor #1 while it was kept moving in free-air. We recorded 1000 samples for each test run. From these 1000 samples, those, which are seen on the right of the graphs, were considered as erroneous sample data and were not considered in calculations. The exact number of samples used in calculations is shown below in the "Valid N" field of each result table. Hardware filtering was deactivated for all three cases in order to measure the peak performances.
Case 1: one receiver
72.8 Hz (average), 79.1 Hz (max) , 69.6 Hz (min), standard deviation of +- 2.27 Hz
|
Valid N
|
Mean
|
Minimum
|
Maximum
|
Std.Dev.
|
|
907
|
0,013732
|
0,012645
|
0,014375
|
0,000442
|
Case 2: two receivers
36.5 Hz Hz (average), 37.2 Hz (max), 35.5 Hz (min), standard deviation of +- 0.69 Hz
|
Valid N
|
Mean
|
Minimum
|
Maximum
|
Std.Dev.
|
|
885
|
0,027428
|
0,026856
|
0,028136
|
0,000496
|
Case 3: three receivers
24.3 Hz Hz (average), 24.5 Hz (max), 23.8 Hz (min), standard deviation of +- 0.22 Hz
|
Valid N
|
Mean
|
Minimum
|
Maximum
|
Std.Dev.
|
|
839
|
0,041152
|
0,040782
|
0,042096
|
0,000369
|
Operating Environment
Taken from the manufacturer manual:
Large metallic objects like desks or cabinets near the operation area will degrade the performance of the tracker. Walls, floors or ceilings containing significant amounts of metal will affect the performance of the tracker too. To reduce the affect cause by metallic objects, keep metallic object away from emitter or receiver three times the distance between emitter and receiver.
We performed our benchmarking tests in normal operating environment, composed of common office appliances such as computers, computer CRT monitors and such. The Wintracker unit performed relatively well on that respect. We consider that it can be operated in such environments without encountering excessive performance degradations. Only when either the emitter or the receivers were placed at distance averaging a few centimetres from these interferences sources could we notice a dramatic accuracy decline.
| 
| 
| 
| 
| 