General incoherent direct sequence spread spectrum signal tracking method

A technology of direct sequence spread spectrum and signal tracking, which is applied in the field of spread spectrum communication and can solve the problem of complex tracking of incoherent direct sequence spread spectrum signals

Inactive Publication Date: 2013-11-27
BEIHANG UNIV +1
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Problems solved by technology

[0006] The tracking of non-coherent direct sequence spread spectrum signal is m

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  • General incoherent direct sequence spread spectrum signal tracking method
  • General incoherent direct sequence spread spectrum signal tracking method
  • General incoherent direct sequence spread spectrum signal tracking method

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Embodiment Construction

[0106] An implementation of the general tracking method suitable for non-coherent direct-sequence spread spectrum signals proposed by the present invention will be described below through a specific implementation example.

[0107]This method can be implemented in the FPGA V5 series chip XC5VSX240T of Xilinx Company. The working clock of ADC and FPGA system is 100MHz, and the center frequency of the input digital intermediate frequency signal carrier is 70MHz. Using the block processing idea, the overall block diagram is as follows: figure 1 As shown, the required configuration parameters include: the frequency control word of the carrier center frequency, the spreading code rate and the data rate, and the loop filter coefficient.

[0108] See Figure 10 , a general non-coherent direct sequence spread spectrum signal tracking method of the present invention, its specific implementation process is as follows:

[0109] 1. Determine the coherent integration time and generate loc...

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Abstract

A general incoherent direct sequence spread spectrum signal tracking method comprises the steps of (1) determining coherent integral time and generating a coherent integral pulse according to the feature of an incoherent direct sequence spread spectrum signal to be tracked; (2) calculating parameters to be configured which are the centre carrier frequency, the data rate, the spreading code rate and the loop filter coefficient; (3) carrying out digital downconversion, wherein an input analog intermediate frequency signal is converted into a digital intermediate frequency signal after being sampled and is multiplied by a locally reproductive digital intermediate carrier to achieve digital downconversion; (4) carrying out correlation operation on a digital downconversion result and a spreading code; (5) carrying out coherent integration result frequency discrimination and phase discrimination and filtration, wherein coherent integration results IP and QP are used for carrier ring frequency discrimination and phase discrimination, frequency discrimination and phase discrimination results are output to a carrier ring loop filter with a third order assisted by a second order, and a filtration result is fed back to a control data NCO. General tracking of the incoherent direct sequence spread spectrum signal with the spreading code rate and the data rate changeable is achieved through the five steps.

Description

technical field [0001] The invention relates to a general non-coherent direct-sequence spread-spectrum signal tracking method, which is a general-purpose tracking method for direct-sequence spread-spectrum signals modulated with non-coherent data, which is suitable for high-dynamic scenes. The research direction of signal processing is related to the field of spread spectrum communication technology related to aerospace. Background technique [0002] With the continuous advancement of technology and the continuous development of my country's satellite industry, the functions of satellite measurement and control systems are becoming more and more complex, and the items that need to be tested are increasing. Relying on its own unique technical advantages, spread spectrum communication has been widely used in various aerospace systems. However, the spread spectrum code rates and data rates used by different aerospace systems are not the same. In this case, in the past, each sat...

Claims

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Application Information

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IPC IPC(8): H04B1/7085
Inventor 常青李育龙徐勇辜晓波
Owner BEIHANG UNIV
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