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PMF-FRFT-based BOC signal capturing algorithm under highly dynamic condition

A PMF-FRFT, high dynamic technology, applied in satellite radio beacon positioning system, measuring devices, instruments, etc., can solve the problem of BOC signal to be verified and achieve the effect of improving flexibility

Pending Publication Date: 2019-02-22
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The above literature method only verified that it is suitable for direct sequence spread spectrum signal, and the capture of BOC signal has yet to be verified

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  • PMF-FRFT-based BOC signal capturing algorithm under highly dynamic condition
  • PMF-FRFT-based BOC signal capturing algorithm under highly dynamic condition
  • PMF-FRFT-based BOC signal capturing algorithm under highly dynamic condition

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Embodiment Construction

[0015] The implementation of the present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0016] step one: figure 1 Shown is the specific block diagram of the realization of the BOC signal acquisition algorithm based on the PMF-FRFT algorithm under the high dynamic environment of the present invention, the specific steps: first use the discrete polynomial phase transformation to determine the order of the received high dynamic signal, if the received signal contains Doppler Le quadratic rate of change, that is, when the dynamic order is 3, the order is reduced first, and then the PMF-FRFT algorithm is used; if the received signal contains the Doppler primary rate of change, the PMF-FRFT algorithm can be used directly. Since partial matched filtering is a low-pass filtering process, after the received signal is multiplied by the combined spreading code, it is processed by PMF to achieve the purpose of speed reducti...

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Abstract

The invention, which belongs to the field of signal processing, claims for protection of a PMF-FRFT acquisition algorithm for BOC signals in a highly dynamic environment. Discrete polynomial phase transform is carried out on a received high dynamic signal to carry out order determination and if the received signal contains a Doppler secondary change rate, order reduction is carried out and then aPMF-FRFT algorithm is used; and if the received signal only contains a Doppler primary change rate, the PMF-FRFT algorithm is used directly. Since the partial matching filtering is a low-pass filtering process, the received signal is multiplied by a combined spreading code and then PMF processing is carried out to realize speed reduction; FRFT processing is carried out on the data after speed reduction to find out an optimal order number; and an obvious peak occurs under the optimal order number and when the spectrum peek exceeds the threshold, the capturing success is realized. The experiments show that the problem that the BOC signal with the Doppler rate can not be captured by the traditional method is solved by the PMF-FRFT algorithm. On the basis of the study on the BOC signals in a highly dynamic environment, the algorithm has the important significance in capturing signals in actual application.

Description

technical field [0001] The invention belongs to the relevant field of BOC signal capture in navigation communication, in particular to a PMF-FRFT-based capture algorithm of BOC signals in a high dynamic environment. Background technique [0002] With the rapid development of global navigation satellite systems (GNSS), the navigation frequency band becomes more and more crowded, and it becomes more and more difficult to capture various navigation signals. At the same time, satellite navigation is widely used in military and civilian fields, and is an important technology related to national development and domain security. At present, the GNSS that has been put into operation includes: the global position system (global position system, GPS) managed by the US government, the Galileo satellite navigation system (Galileo satellite navigation system, GALILEO) managed by the European Union and the European Space Agency, and the global positioning system managed by the Russian Fed...

Claims

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Application Information

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IPC IPC(8): G01S19/24
CPCG01S19/24
Inventor 张天骐袁帅刘董华张刚
Owner CHONGQING UNIV OF POSTS & TELECOMM
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