Beidou satellite navigation receiver, and method and device for improving tracking sensitivity of same

Abstract

The invention is applicable to the field of navigation field and provides a Beidou satellite navigation receiver, and a method and a device for improving tracking sensitivity of the Beidou satellite navigation receiver. The method comprises the steps of: accumulating an I branch value and a Q branch value in each bit among continuous n bits separately to obtain n groups of bit accumulated values after successful bit synchronization and determination of a first millisecond of a bit period; multiplying the I branch values and the Q branch values in the n groups of bit accumulated values by 2<n> or 2<n-1> kinds of bit compensation values separately, so as to obtain 2<n> or 2<n-1> groups of compensated bit accumulated values; performing m-point FFT operation on the 2<n> or 2<n-1> groups of compensated bit accumulated values separately, so as to obtain 2<n> or 2<n-1> groups of FFT results, wherein each group of FFT results includes m values; finding out the maximum value of each group among the m values of each group of FFT results, so as to obtain 2<n> or 2<n-1> values; and finding out the maximum value of the 2<n> or 2<n-1> values, and confirming the group in which the maximum value exists as a real bit condition. By implementing the Beidou satellite navigation receiver, the method and the device, the maximum length of an integrator-eraser can be increased from 20 or 2 to a multiple of 20 or 2, thereby improving the tracking sensitivity.

Description

technical field [0001] The invention belongs to the field of navigation, and in particular relates to a Beidou satellite navigation receiver and a method and device for improving its tracking sensitivity. Background technique [0002] Both Beidou satellite navigation system and GPS system are global positioning systems, which play an increasingly important role in today's life, occupying a very important position in the fields of navigation, positioning, timing, and speed measurement. At present, China's Beidou satellite navigation system is developing rapidly, and the navigation receivers of the Beidou satellite navigation system will become more and more common. Navigation receivers usually include: antenna, radio frequency module, baseband signal processing module and other application modules. Among them, the main functions of the baseband signal processing module include searching for satellites in the sky and demodulating the correct navigation message, and generating...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of Beidou satellite navigation receiver and its method and device for improving its tracking sensitivity, aiming to solve the problem that the maximum length of the integrating-clearing device in the prior art is only a bit period, and the length is too short, so the tracking sensitivity is relatively low. low problem

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