High-precision fine synchronization device and method

Abstract

The invention discloses a high-precision fine synchronization device and method. The method comprises the steps that (S1) course capture of a synchronization sequence is carried out; (S2) multipath parallel correlation units are adopted for carrying out correlation operation in a chip before a peak value of the course capture and in a chip after the peak value of the course capture to obtain a sample sequence Y of a correlation function; (S3) the correlation function is approximated by means of the Gaussian function, the Gaussian function is initialized with the help of the sample sequence Y, and Gaussian function parameters are iterated through a Gaussian-Newton method; (S4) after iteration is finished, the parameter b of the Gaussian function is extracted, and the estimated value of the peak value position is obtained directly. According to the high-precision fine synchronization device and method, the shape features of the correlation function are utilized fully, the correlation function is approximated by means of the Gaussian function, the parameters are iterated through the Gauss-Newton method, synchronization results are extracted from the parameters, and the precision of precision synchronization is improved; the convergence sped is high, and parameter extraction is direct; achievement complexity is low, calculated amount is not increased greatly compared with a parallel correlation method under an equivalent sampling rate, and the device and the method are less influenced by noise, and are convenient to apply in reality.

Description

technical field [0001] The invention relates to a high-precision synchronization technology in the field of communication and measurement and control, in particular to a high-precision fine synchronization device and method based on the Gauss-Newton method. Background technique [0002] The synchronization of the communication system is the basis for establishing reliable communication. In the field of measurement and control, the error of random code synchronization is an important factor affecting the accuracy of ranging. In recent years, as the conversion rate of analog-to-digital converters has become higher and higher, the processing capabilities of digital devices have also become stronger and stronger. Synchronization at a higher sampling rate is a common method to improve synchronization accuracy. [0003] In a common communication or measurement and control system, synchronization is carried out in two steps: first, rough capture is carried out, and the approximate ...

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Problems solved by technology

[0009] The above four synchronization algorithms have the following characteristics: the parallel correlation method is simple, but reducing the correlator time interval will increase the number of correlators and the calculation amount of each correlator, and the performance improvement is limited; the FFT cycle correlation algorithm reduces the parallel correlation. The computational complexity of the algorithm does not improve its accuracy; the accuracy of the matched filter method is limited by the sampling interval of the local sequence, and the output result of the IF matching will oscillate; the delay locking scheme has a slow convergence speed and is affected by self-noise, so the accuracy and stability are not good. ideal

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