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wind_sensor:getting_angle_orientation [2015/12/18 04:26] jeremygg [Microphone Predicament] |
wind_sensor:getting_angle_orientation [2021/09/19 21:59] (current) |
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| The most basic thing would be to find the angle in between would be the ratio of the 2 amplitudes. After fitting a couple of models, we chose to fit the angle with the arctan(lowest_mic/2nd_lowest_mic). Since the minimum switches off right between the half way marks of the mic, the actual range should be from 0 to 45 degrees (A->B 0 to 45 degrees, B->A 45 to 90 degrees). With this data we fitted a general line to arctan(mic4/mic3) to the degree of the fan hitting in respect to mic 2. | The most basic thing would be to find the angle in between would be the ratio of the 2 amplitudes. After fitting a couple of models, we chose to fit the angle with the arctan(lowest_mic/2nd_lowest_mic). Since the minimum switches off right between the half way marks of the mic, the actual range should be from 0 to 45 degrees (A->B 0 to 45 degrees, B->A 45 to 90 degrees). With this data we fitted a general line to arctan(mic4/mic3) to the degree of the fan hitting in respect to mic 2. | ||
| - | {{:wind_sensor:4angpred.jpg|}} | + | {{:wind_sensor:4angpred2.jpg|}} |
| Using this model we predicted the angle. (Note at this point 12/17/2015 the accuracy of this prediction is questionable). Now that we got the angle, we can fix the gain problem. We want to fix the fact that we calibrated the wind speed with the reading from our sensors with the wind heading dead on. Since we can calculate for the angle, we can simply divide by the gain of the output that the angle created. We took our data of our outputs at multiple degrees and divided it by the output at 0 degrees which will equal the gain that the degree has created. | Using this model we predicted the angle. (Note at this point 12/17/2015 the accuracy of this prediction is questionable). Now that we got the angle, we can fix the gain problem. We want to fix the fact that we calibrated the wind speed with the reading from our sensors with the wind heading dead on. Since we can calculate for the angle, we can simply divide by the gain of the output that the angle created. We took our data of our outputs at multiple degrees and divided it by the output at 0 degrees which will equal the gain that the degree has created. | ||