Performance of MEMS Barometric Sensors Table 1. Deviation in Sensors' Output Signal at Different P/T Levels and Statistical Analysis Pressure Level (bar) T≅30°C T≅10°C T≅50°C Av. Deviation Bosch/ST (ubar) Av. Deviation Bosch/ST (ubar) Av. Deviation Bosch/ST (ubar) ≅0.91 477.30/1267.9 427.40/1023.2 550.10/1359.6 ≅0.92 468.20/1242.5 438.20/1014.2 561.10/1367.3 ≅0.93 475.10/1220.0 477.10/983.70 522.10/1363.4 ≅0.94 484.40/1278.9 487.50/954.80 535.40/1413.5 ≅0.95 512.90/1265.7 484.40/962.80 501.50/1424.5 ≅0.96 487.00/1264.4 522.90/998.80 489.10/1425.7 ≅0.97 483.10/1227.6 517.50/1001.2 493.20/1410.6 ≅0.98 465.70/1254.4 526.10/998.30 468.10/1370.9 MEMS Vendor Bosch Sensortec STMicro-electronics Population Mean RMS Noise P-P Noise (μbar) Population Mean RMS Noise P-P Noise (μbar) Population Mean RMS Noise P-P Noise (μbar) μ=481.7125 μ=485.1375 μ=515.0750 σ=14.6967 σ=37.3377 σ=32.4074 6.6*σ=96.9981 6.6*σ=246.4290 6.6*σ= 213.8885 μ=1252.7 μ=992.125 μ=1391.9 σ=20.8038 σ=23.7309 σ=29.0889 6.6*σ=137.3053 6.6*σ=156.6241 6.6*σ=191.9866 Population Mean (ubar) RMS Noise (ubar) MEMS Vendor P-P Noise (ubar) for the overall measurements Bosch Sensortec μ=493.9750 σ=32.3108 6.6*σ=213.2516 STMicro-electronics μ=1212.2 σ=170.9194 6.6*σ= 1128.1 sensing P/T) is determined, and thereafter removed from the actual measurement (the latter measurement is used for determining the airplane's position angles). The acquisition of the reference measurement can by triggered by an accelerometer (ACCEL) unit that identifies the airplane's alignment with the horizon, and then updates the system's variable that holds this particular measurement. From the two evaluated pairs of sensors, it is preferable to employ lps35hb devices in this particular setup because of their negligible variations of P-P noise at different temperature levels (compared with the noise produced by bme280 devices). The second setup (Figure 5(b)) is the address for the determination of the airplane's absolute height above the potential landing terrain. One of the two barometers is attached to the airplane, while 38 the other is attached to the landing terrain. This particular setup does not sustain recalibration of the system for the identification of the existing deviation in the sensors' output signal. Thereby, it is preferable to employ bme280 devices in this particular setup. According to the analysis performed before, the one-time calibration of the bme280 devices will produce an error of 0.2 mbar (i.e., 1.6 m at the sea level) in the worst case scenario (while lps25hb produces error more than 1 mbar). CONCLUSION This article has evaluated two contemporary commercial barometric pressure sensors of different MEMS vendors, in terms of IEEE A&E SYSTEMS MAGAZINE SEPTEMBER 2017