A Method of Suppressing Zero Crossing Deviation Based on Selective Non-equal Sampling
A non-equal sampling and zero-crossing technology, applied in the field of navigation, can solve the problem of non-existent sampling frequency, etc., and achieve the effect of suppressing the zero-crossing deviation of the pseudo-code phase, simple implementation, and small amount of calculation
Active Publication Date: 2020-11-27
湖南中电星河电子有限公司
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However, when there are many constraints, such a sampling frequency may not usually exist
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[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0030] In the satellite navigation system, pseudorange is one of the most important observations, which can provide users with high-precision and unambiguous time-difference observation results. However, in the digital code tracking loop, the limited sampling frequency of the baseband signal cannot receive all the sidelobes of the spread spectrum signal without distortion, resulting in biased code phase delay estimation. The invention provides a zero-crossing deviation suppression method based on selective non-equal sampling. According to the quantitative relationship between the zero-crossing dev...
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The invention provides a zero crossing point deviation suppression method based on selective non-commensurate sampling. The suppression of the zero crossing point deviation of a digital code phase discriminator is achieved by designing the non-commensurate sampling frequency of the digital code phase discriminator. Based on a quantitative relationship between the zero crossing point deviation andthe sampling frequency, and the quantitative relationship between a spreading code rate and a correlation interval of the digital code phase discriminator, the non-commensurate sampling frequency withzero crossing point deviation suppression capability is determined. According to the zero crossing point deviation suppression method provided by the invention, the zero crossing point deviation of apseudo code phase can be effectively suppressed by using the selective non-commensurate sampling frequency. In addition, only the baseband signal sampling frequency of a classic receiver is changed in the zero crossing point deviation suppression method provided by the invention, so that the implementation is simple, the calculation amount is small, the implementation is very convenient, and thezero crossing point deviation suppression method can be directly used in a conventional pseudo code tracking loop.
Description
technical field [0001] The invention belongs to the technical field of navigation, and in particular relates to a method for suppressing zero-crossing deviation based on selective non-equal sampling, which can be used in satellite navigation signal receivers or other types of spread spectrum receivers. Background technique [0002] Code phase is one of the most important observations in a satellite navigation system because it provides users with unambiguous time-delay observations. In the digital code tracking loop, the limited sampling frequency cannot receive the entire spectrum of the spread spectrum signal without distortion, which leads to the problems of insufficient phase resolution and zero-crossing deviation of the digital code phase delay discriminator. [0003] The non-equal sampling frequency means that the sampling frequency and the spreading code rate do not satisfy the integer relationship. Using this sampling frequency, the code phase information can be dis...
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IPC IPC(8): G01S19/30
CPCG01S19/30
Inventor 肖志斌马春江唐小妹孙广富林红磊左勇张可孙鹏跃楼生强
Owner 湖南中电星河电子有限公司