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. The method comprises the following steps: expanding a channel range in a frequency band by M%; measuring the time delay characteristic of the channel group in the expanded frequency band; obtaining denominator group delay of an all-pass filter; carrying out cos fitting on the denominator group time delay, and acquiring a denominator coefficient of the all-pass filter; obtaining a denominator polynomial coefficient; designing a first-stage all-pass filter; acquiring a balanced residual error, abandoning the extended frequency band, and designing a second-stage all-pass filter; and cascading the first-stage all-pass filter and the second-stage all-pass filter to obtain the group delay equalization all-pass filter. According to the invention, the all-pass filter of any group delay is designed by using a complex cepstrum theory, secondary equalization is performed according to the equalization residual error, and finally the group delay can be equalized by using the finite filter order in the specified passband so that the problem of a positioning error caused by related peak distortion brought by the group delay is solved.

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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