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Precise delay implementation method for satellite navigation digital baseband signal

A technology of digital baseband and implementation method, applied in the field of satellite navigation and simulation, can solve the problems of inability to adapt to the rapid change of pseudorange of satellite navigation signal simulator, large computational load of digital delay filter, inability to meet real-time signal simulation, etc. The effect of fast movement, large pseudo-range change, and guaranteed control accuracy

Active Publication Date: 2010-12-08
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The delay of a single digital delay filter is fixed, which cannot meet the needs of the rapid change of the pseudo-range of the satellite navigation signal simulator
However, the real-time design of digital delay filters has a large amount of computation, which cannot meet the needs of real-time signal simulation.

Method used

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  • Precise delay implementation method for satellite navigation digital baseband signal
  • Precise delay implementation method for satellite navigation digital baseband signal
  • Precise delay implementation method for satellite navigation digital baseband signal

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Embodiment Construction

[0037] The block diagram of the analog signal generation of a single navigation satellite is as follows figure 1 As shown, the simulation part of the navigation signal simulator generates data such as navigation messages, pseudoranges, and logic times. The static clock source provides the frequency reference for the code generator and the carrier generation. The code generator generates the pseudo-random code of the satellite, and the satellite navigation message is modulated by the code to generate a standard digital baseband signal.

[0038] figure 1 The part inside the dashed box is the signal delay generation scheme, that is, the pseudorange is divided into two parts: large number delay and fractional delay. The large number delay is an integer multiple of the clock cycle, which is realized by multiple whole clock cycles, and the delay of the whole clock cycle is realized by executing the program. The fractional delay is a fractional multiple of the clock period and is...

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Abstract

The invention relates to a precise delay implementation method for a satellite navigation digital baseband signal. In the method, a pseudo range is decomposed into great number delay and small number delay, wherein the great number delay is realized by the delay of a plurality of entire clock periods; and the small number delay is realized by digital delay processing. The digital delay processing comprises the processes of data interpolation, digital delay filtering and selection. A small number delay signal is subjected to reverse mirror image filtering after the data interpolation and is subjected to anti-aliasing filtering before the selection. Not only the variation range of the pseudo range but also the control accuracy can be ensured by using a great number implementation method and a small number implementation method respectively.

Description

technical field [0001] The invention relates to the technical field of satellite navigation and simulation, in particular to a method for realizing precise delay of a digital baseband signal of satellite navigation. Background technique [0002] The basic principle of using satellites for navigation and positioning is: the ground receiver measures the actual distance relative to the four satellites to form a spatial geometric equation, and then solves the spatial coordinates of the receiver location according to the satellite coordinates in the satellite ephemeris. Distance error is the main source of final positioning error. In the actual positioning process, there is relative motion between the satellite and the receiver, resulting in the constant change of the distance between the satellite and the receiver. Since the electromagnetic wave propagates at the speed of light, this distance change will cause the propagation time of the electromagnetic wave to change. From the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/13G01S19/35
Inventor 王跃科杨俊张传胜陈建云明德祥钟小鹏单庆晓周永彬邢克飞
Owner NAT UNIV OF DEFENSE TECH
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