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Space-time chaos vector pseudo-random code generator offset carrier modulation method and system

A pseudo-random code, offset carrier technology, applied in the field of satellite navigation, can solve the problems of low complexity of ranging codes, low security, and fuzzy demodulation of demodulation signals.

Active Publication Date: 2018-11-23
WUHAN UNIV
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Problems solved by technology

The real pseudo-random code generator can overcome the disadvantages of the current binary pseudo-random code generator that the ranging code length is fixed and short and the number of codes is limited. However, due to the use of a nonlinear function and generally a quadratic function , and the data precision is 10 -2 , so that the complexity of the generated ranging code is not high, the security is not strong, and there are too many space grid points, and each grid point state variable only generates a real pseudo-random number at a time
[0007] In addition, when demodulating the BOC signal, because the BOC modulation destroys the pseudo-randomness of the spread spectrum signal of the navigation message of the navigation satellite, the demodulated signal has multiple correlation peaks and causes ambiguous demodulation problems

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  • Space-time chaos vector pseudo-random code generator offset carrier modulation method and system
  • Space-time chaos vector pseudo-random code generator offset carrier modulation method and system
  • Space-time chaos vector pseudo-random code generator offset carrier modulation method and system

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Embodiment Construction

[0164] The present invention will be further described in detail below in conjunction with the embodiment of the forward-extended complex state component, according to figure 1 The implementation steps are as follows:

[0165] S1 builds a vector pseudo-random code generator G, G is composed of a single complex state vector X+Yj, at I M The component of +N-dimensional linear space is {x(i)+y(i)j}, which is called complex state component, {x(i)} and {y(i)} are a series of sequentially arranged and coupled with each other State component; i represents the position number of the complex state component, i=1,2,...I M +N, I M , N are all positive integers, and N takes a value according to needs; the former I M A complex state component is denoted as an extended complex state component, and its position number i∈[1,I M ]; the last N complex state components are recorded as effective complex state components, and their position sequence number i∈[I M +1,I M +N], the effective co...

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Abstract

The invention discloses a spatiotemporal chaos vector pseudo-random code generator offset carrier modulation method and system, and the method comprises the steps: building a vector pseudo-random code generator; carrying out the functioning of the current state values of the current positions and offset positions of the component real parts and imaginary parts of a single complex stator vector through various types of nonlinear functions; taking a diffusion coefficient and a mutual coupling coefficient as weight values for the mixed calculation of addition, subtraction, multiplication or division; generating a complex pseudo-random number sequence, distributed along with time, through state iteration; extracting a real pseudo-random number sequence from the related component taps of the real and imaginary parts of a state component; carrying out binarization and binary addition through real offset carrier modulation, or carrying out the binary addition with a binarized real offset carrier after binarization; outputting and obtaining a range finding code with the needed frequency offset at a combined frequency through a bandpass filter. The method can be widely used for a satellite navigation system, and also can be used for various types of range finding systems, communication systems, broadcast and TV systems and control systems.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a space-time chaos vector pseudo-random code generator offset carrier modulation method and system. Background technique [0002] At present, the four major satellite navigation systems in the world are the GPS (Global Positioning System) satellite navigation system of the United States, the GLONASS (Global Navigation Satellite System) satellite navigation system of Russia, the Galileo satellite navigation system of the European Union and the BeiDou satellite navigation system of China . Except for GLONASS which adopts frequency division multiple access (FDMA, Frequency Division Multiple Access) communication mode, other satellite navigation systems adopt code division multiple access (CDMA, Code Division Multiple Access) communication mode. The ranging codes used by them are divided into two categories: civilian coarse codes and military fine codes. Satellite navig...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/29G01S19/30
CPCG01S19/29G01S19/30
Inventor 何志彪肖模艳周扬眉
Owner WUHAN UNIV
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