Self-calibration method of the microwave radiometer using two temperature references

To minimize the effect of gain fluctuations on the performance of Hach's radiometer and increase its long-term stability and reliability, a self-calibration method is proposed that uses the same internal temperature references. The calibration method could be performed almost without interrupting temperature measurements at any time during remote sensing operations. It is shown that the method is a convenient way to improve the stability of Hach's radiometer without adding expensive components.