Precise delay implementation method for satellite navigation digital baseband signal
A technology of digital baseband and implementation method, which is applied in the field of satellite navigation and simulation, can solve the problems of not being able to adapt to the rapid change of pseudo-range of satellite navigation signal simulator, the large amount of calculation of digital delay filter, and the inability to meet the real-time simulation of signals, etc., to achieve The effect of fast movement speed, large change of pseudo-range, and guaranteed control accuracy
Active Publication Date: 2012-08-22
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.
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[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 message, pseudorange and logical time. The secret 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 middle dotted line box is the scheme of signal delay generation, that is, the pseudorange is divided into two parts: large number delay and fractional delay. The delay of a large number is an integer multiple of the clock cycle, which is realized by multiple full clock cycles, and the delay of the full clock cycle is realized by executing the program. The fractional delay is a fractional multiple of the cl...
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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 precise delay realization method of a satellite navigation digital baseband signal. 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 calculates the spatial coordinates of the receiver's location based on the satellite coordinates in the satellite ephemeris. Range error is the main source of final positioning error. In the actual positioning process, there is relative motion between the satellite and the receiver, which causes the distance between the satellite and the receiver to change continuously. Since electromagnetic waves propagate at the speed of light, this distance change will lead to changes in the propagation time of electromagnetic waves. From the perspecti...
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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
OwnerNAT UNIV OF DEFENSE TECH