GPS navigation system spread-spectrum sequence constructing method

Abstract

The invention discloses a method for constructing a GPS navigation system spectrum sequence. The method is characterized by comprising the following steps: (1) defining N spectrum sequences (C0, C1, and to CN), wherein, the Cn equals (c<n, 0>, c<n, 1>, and to c<n, N-1>), and the length thereof is N; (2) ensuring that the spectrum sequences have interference-free windows; and (3) as for any x(n) in which n equals 0, and to N-1 in Zadoff-Chu series with length being equaling N, constructing as follows: x(n) equals (e<-j2piqn#+(2> / N), N is an even number, when the x(n) equals e<-j2piqn(n+1) / N>, N is an odd number, wherein, q and N are prime numbers for each other. The spectrum sequence constructed by the method is adopted to cause the anti-multipath property to reach a theoretically optimum value, thus greatly improving the navigation positioning precision.

Description

technical field

[0001] The invention relates to a method for constructing a spread spectrum sequence, in particular to a method for constructing a spread spectrum sequence of a GPS navigation system that can effectively resist multipath. Background technique

[0002] With the development of short-range differential GPS (Global Positioning System) and civilian GNSS systems, system errors such as SA error, ionosphere error, and troposphere error can be further eliminated, and the dynamic positioning accuracy can reach sub-meter level. Disturbance errors become the main source of error. Due to the existence of multipath interference, the GPS-based satellite navigation system cannot reach the specified accuracy, and overcoming multipath interference has become a hot issue in satellite navigation research. At present, there are mainly two measures for anti-multipath interference: first, improve the distance measurement accuracy of the receiver, such as narrow correlation code tr...

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