Two-directional pseudo code parallel search system and realization method thereof

A technology of a search system and an implementation method, applied in the field of pseudo-code search systems, can solve the problems of long acquisition time, low efficiency, and difficulty in meeting P code index requirements, and achieves the goal of improving search efficiency, processing speed, and shortening search time. Effect

Inactive Publication Date: 2011-05-11
CHENGDU GUOXING COMM
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The search process is like this, first estimate the Doppler value, and then search the entire code phase under the Doppler value, if no effective signal is found, then change a Doppler grid and continue searching until Search the entire possible...

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  • Two-directional pseudo code parallel search system and realization method thereof
  • Two-directional pseudo code parallel search system and realization method thereof
  • Two-directional pseudo code parallel search system and realization method thereof

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Embodiment 1

[0046] Such as Figures 1 to 5 As shown, the circuit is established on the FPGA, including the signal receiving device, the signal receiving device is connected to the digital down converter DDC, and the two output ports of the in-phase component I and the quadrature component Q of the digital down converter DDC are respectively sampled by twice the code clock The switch is connected to the buffer device, and the buffer device is connected to the parallel correlator; the local PN code generator is connected to the buffer device through a double code clock sampling switch, the buffer device is connected to the shift register, and the shift register is matched and connected to multiple correlators; After the parallel correlator is connected to the buffer, it is connected to the Fourier transform modulus circuit FFT, and the FFT circuit is connected to the correlation peak search circuit through the signal non-coherent accumulation circuit, and the correlation peak search circuit ...

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Abstract

The invention discloses a two-directional pseudo code parallel search system which comprises a signal receiving device, a local PN (pseudo-noise) code generator, a signal acquiring module and a single processor; the local PN code generator and the signal acquiring module are connected with the signal processor respectively; and the local PN code generator is connected with the signal acquiring module. The two-directional pseudo code parallel search system further comprises a signal input device connected with the signal acquiring module, and enables the searches in phase direction and Doppler direction to be finished simultaneously within the related integral time, thereby shortening the search time, and improving the search efficiency. As all digital signal processing is realized on hardware in an assembly line manner, and the concurrency of the hardware is fully utilized for completing the whole search process, the speed of data processing on the hardware is greatly improved compared with the data processing on software, and the chip realization is benefited.

Description

technical field [0001] The invention relates to a pseudo-code search system, in particular to a pseudo-code two-dimensional parallel search system for a satellite navigation system and an implementation method thereof. Background technique [0002] In the current satellite navigation system, the acquisition performance of satellite signals determines the sensitivity of the receiver and the first positioning time and other important performances, especially in the acquisition of P code, because the code word is very long, the amount of calculation required for the search is very large. As the key unit of the baseband signal processing of the Beidou-2 user machine, the pseudo code acquisition unit determines the important indicators of the user machine such as acquisition sensitivity and first positioning time. Usually, the search for the pseudocode is divided into two independent processes, namely, the search in the distance dimension and the search in the Doppler dimension. ...

Claims

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Application Information

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IPC IPC(8): G01S19/30
Inventor 白松
Owner CHENGDU GUOXING COMM
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