Recursive cosine transform method for plane geomagnetic anomalous field one-step upward continuation plane modulus gradient field

• Main Authors: HUANG YU, WU LIHUA, LYU ZHENCHUAN, QI RUIYUN
• Format: Patent
• Language: Chinese; English
• Published: 24.10.2017
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

The invention provides a recursive cosine transform method for plane geomagnetic anomalous field one-step upward continuation plane modulus gradient field. Plane geomagnetic anomalous field measurement data is preprocessed; the geomagnetic anomalous field measurement data irregularly and discretely distributed on an observation plane is gridded through utilization of a radial primary function interpolation method, thereby obtaining gridded geomagnetic anomalous measurement data; the gridded geomagnetic anomalous measurement data is transformed into cosine transform wave spectrums through utilization of recursive cosine transform; the wave spectrum of each component of a geomagnetic modulus gradient field is calculated according to the geomagnetic cosine transform wave spectrums through utilization of a one-step wave number domain transform factor; and recursive inverse cosine transform of line direction phase shift Pi/2 is carried out on the wave spectrums of a horizontal x component, a horizontal y component