Study on phase calibration signal processing

The traditional method for the extraction of phase calibration (PCAL) signal is inefficient when the number of PCAL tone is large. According to the special spectrum of the PCAL signal, an efficient method based on DFT is proposed for the multi-tones extraction. All the phases of the multi PCAL tones can be obtained in once DFT. The computation amount of the new method doesn´t increase with the number of PCAL tones. Compared with the traditional correlation method, the new method is superior when the tone´ number is larger than seven. Field experiment is conducted to verify the new method.