Compensating for drift in pressure sensors

A method for compensating for pressure measurement drift of a first sensor and a second sensor, wherein the drift is at least partially temperature dependent, and wherein the first sensor is configured to measure a first pressure and the second sensor is configured to measure a second pressure, the method comprising:

• acquiring data during a time period in which active ventilation does not contribute to differences in measured pressure between the first sensor and the second sensor, the data comprising a plurality of values of each of:
• the first pressure;
• a first temperature associated with the first sensor;
• the second pressure;
• and a second temperature associated with the second sensor;
• for each of a plurality of times in the time period, obtaining from the data:
• i) the first temperature at that time,
• ii) the second temperature at that time, and
• iii) a pressure difference between the first pressure at that time and the second pressure at that time;
• and
• performing a curve fit analysis to obtain a calibration function of the pressure difference as a function of at least the first temperature and the second temperature.