Research on the Down-rate Filtering Method for Observations of Precision Ranging System of Gravity Satellite

In the field of satellite time-frequency transfer and vector measurement technology, high-precision filtering of observations is very important. The basic requirement is to reduce noise interference while retaining effective observation information, and to achieve efficient and high-precision transmission of original information. In the development of high-precision ranging system for China’s earth gravity satellite, based on optimization of the FIR filter structure and improvement of the window function, a rate-down filtering algorithm for 10Hz raw ranging data is proposed in order to achieve high-frequency noise suppression and retain low-frequency gravity field information. CEDF for short, this algorithm has the operation efficiency of convolution, extraction and difference. Compared with other similar algorithms, the proposed method has the functions of both deceleration filtering and difference calculation, the noise suppression suppression degree is better than 44%, and the frequency cutoff characteristic is steep, and the suppression degree of the first side lobe reaches –94 dB. The algorithm not only improves the ranging accuracy and fully retains the information of gravity field, but also simplifies the post-processing process of ground data, and provides an optimal scheme for the data processing of microwave measurement system and laser measurement system. CEDF algorithm plays an important role in the engineering development of Earth gravity detection satellites in China and provides an effective means for the efficiency evaluation of loads.