Weak signal acquisition method based on overlapping multi-block zero padding algorithm

A technology of weak signal capture and block zero padding, which is applied to satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problems of increased computation and decreased detection performance, and achieve the effect of improving capture performance

Active Publication Date: 2017-10-13
XIDIAN UNIV
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Problems solved by technology

However, in DBZP, the block length and the number of blocks are determined by the frequency resolution and the Doppler frequency offset search range and are fixed. In order to ensure a larger Doppler fre

Method used

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  • Weak signal acquisition method based on overlapping multi-block zero padding algorithm
  • Weak signal acquisition method based on overlapping multi-block zero padding algorithm
  • Weak signal acquisition method based on overlapping multi-block zero padding algorithm

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Embodiment Construction

[0032] Embodiments of the present invention and effects are further described below in conjunction with the accompanying drawings:

[0033] refer to figure 1 , this embodiment applies a high dynamic weak signal acquisition system, which includes a transmitting end and a receiving end, and the channel model adopts an additive white Gaussian noise channel with additional carrier frequency offset and phase offset. The basic working principle of the system is as follows:

[0034]At the sending end, a piece of navigation data is spread-spectrum-modulated by a spread-spectrum code to form a set of spread-spectrum sequences, and the sequence is subjected to SOQPSK modulation and up-conversion to obtain a transmitted radio frequency signal;

[0035] At the receiving end, the received RF signal is sequentially filtered, down-converted and digitally sampled to obtain the original baseband complex signal; the local spreading code is modulated by SOQPSK to obtain the original local signa...

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Abstract

The invention discloses a weak signal acquisition method based on an overlapping multi-block zero padding algorithm, and a defect of coherent accumulation length and block number invariability in an existing double-block zero padding algorithm is mainly solved. The solution is that a received RF signal is orderly subjected to filtering, down conversion and digital sampling at a receiving end, and an original baseband complex signal is obtained; navigation data used by a sending end is subjected to spread spectrum modulation and shaped offset quadrature phase shift keying modulation to obtain an original local signal; coherent accumulation extended data and a step factor are introduced, the original baseband complex signal and the local signal are subjected to block combination, and a new baseband complex signal data block and a new local signal data block are obtained; the new baseband complex signal data block and the new local signal data block are subjected to circular correlation, and related value data is obtained; according to a peak value which appears in the related value data, whether acquisition is successful is judged. According to the method, better acquisition performance can be obtained in a small frequency offset, and the method can be used for data transmission and satellite positioning navigation.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a method for capturing weak signals, which can be used for data transmission, satellite positioning and navigation and distance measurement. Background technique [0002] With the continuous development of satellite navigation technology, the application of global navigation and positioning system GNSS is becoming more and more extensive. The United States, Russia, China, and the European Union have all formulated policies and plans to accelerate the development of global satellite navigation technology. Positioning and navigation with no blind spots and high sensitivity has become the latest technology development direction, which requires the rapid capture of weak signals in high dynamic environments. [0003] In the traditional weak signal acquisition algorithm, the serial acquisition algorithm achieves signal acquisition by continuously adjusting the local carr...

Claims

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Application Information

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IPC IPC(8): G01S19/24
CPCG01S19/246
Inventor 孙锦华吕珊珊岳家弘王昊
Owner XIDIAN UNIV
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