Navigation receiver radio frequency front-end group delay characteristic equalization design method and device

Abstract

The invention discloses a navigation receiver radio frequency front-end group delay equalization design method and device, comprising the following steps: expanding the channel range in the frequency band by M%; measuring the extended channel group delay characteristics in the frequency band; obtaining all-pass filtering The denominator group delay of the filter; Cos fitting is performed on the denominator group delay to obtain the denominator coefficient of the all-pass filter; obtain the denominator polynomial coefficient; carry out the design of the first-stage all-pass filter; obtain the equalization residual and discard the extended frequency band , to design the second-stage all-pass filter; cascade the first-stage all-pass filter and the second-stage all-pass filter to obtain a group delay equalization all-pass filter. The present invention uses the complex cepstrum theory to design an all-pass filter with any group delay, performs secondary equalization according to the equalization residual error, and finally can use the finite filter order to equalize the group delay within the specified passband, thus solving the problem of group delay The positioning error problem caused by the correlation peak distortion brought by the delay.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a design method and device for equalizing the delay characteristics of a radio frequency front-end group of a navigation receiver. Background technique [0002] High-precision navigation receivers are widely used in the ground segment, space segment, and control segment of satellite navigation systems. They are the core measurement equipment for satellite navigation systems to complete important system services such as satellite-ground time synchronization and satellite precise orbit determination. They are important for ensuring navigation system services. The basis of performance. The group delay of the receiver signal channel is mainly determined by the RF front end, which has a great impact on the signal, which will cause the signal correlation peak to be distorted, resulting in positioning errors. In order to ensure high-precision positioning of satellite navig...

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Problems solved by technology

For this reason, the present invention proposes a navigation receiver radio frequency front-end group delay characteristics equalization design method and device, which can perform equalization processing on the navigation receiver radio frequency front-end group delay characteristics, and solve the problem caused by the correlation peak distortion caused by the group delay positioning error problem

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