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Two dimension quick catching device and method of spread spectrum signal

A spread spectrum signal and capture device technology, applied in the field of communication, can solve the problems of high threshold setting, high false alarm probability, low detection probability, etc., achieve stable and good work, avoid complex calculation, and achieve the effect of capture

Inactive Publication Date: 2007-10-10
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The present invention provides a two-dimensional fast capture device and method for spread spectrum signals, which solves the problem that the high threshold setting in the prior art will cause the detection probability to be too low under low signal-to-noise ratio to miss capture, and the threshold setting is low, but the Defects that will lead to a high probability of false alarms under high signal-to-noise ratio conditions, resulting in wrong captures

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  • Two dimension quick catching device and method of spread spectrum signal
  • Two dimension quick catching device and method of spread spectrum signal

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Embodiment 1

[0030] Suppose the working clock frequency of the circuit: 64×1.2288MHz, code rate: 1.2288Mbps, spread spectrum code length: 1024. Spread spectrum code phase estimation is: in 1024 code phases, find the phase corresponding to the maximum energy after despreading, so that the code phase estimation deviation can be guaranteed to be within 0.5 chips, so as to provide support for subsequent code phase tracking Provide parameters. Parallel acquisition matches the input signal by sliding the local code, and its advantage is that a correlation result can be obtained within a time width of one chip, and the acquisition of the code phase can be realized within a time width of 1024 chips.

[0031] As shown in Figure 3, the depth of RAM: 1024, the write clock is 1.2288MHz, the write data is an input signal and is written into the RAM sequentially, the read clock is 64×1.288MHz, there are 16 channels of read data, the second channel The read address is 64 larger than the first read addre...

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Abstract

Whole Doppler range of signal is divided into frequency sweep points. Using united non-coherent detecting energy in parallel de-spread on all frequency sweep points, the method finds out maximum value. Comparing the maximum value with referenced threshold determines whether signal is captured, and carrier frequency and phase of de-spread code. Under limited resources, the method avoids complex calculation, and realizes quick capturing signal. In condition of large frequency deviation and high dynamic signal, the invention guarantees stable, high performance quick operation in whole dynamic range. The invention is applicable to area of satellite communications and wireless communication based on spread spectrum.

Description

technical field [0001] The invention relates to a communication technology, in particular to a two-dimensional rapid acquisition device and method for spread spectrum signals. Background technique [0002] Today, the new generation of satellite mobile communication system requires seamless coverage and can support personal hand-held terminal communication. In particular, the satellite spread spectrum technology represented by GPS has been widely used in navigation, positioning and communication, which has greatly improved people's quality of life. However, satellite spread spectrum signals have the characteristics of large Doppler frequency deviation and large dynamic conditions, which put forward strict requirements on the time of signal acquisition. At present, for the rapid capture of satellite spread spectrum signals, although there are capture techniques such as FFT-based parallel codes, the high computational complexity and low precision make it unsuitable for capturi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/185H04B1/7075
Inventor 刘翔江玉洁易争荣刘会杰梁旭文
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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