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Direct sequence spread spectrum signal time-frequency two-dimensional interpolation precise estimation method

A time-frequency two-dimensional, direct-spread signal technology, used in transmission systems, electrical components, etc., can solve the problems of insufficient carrier Doppler frequency and pseudo-code phase estimation accuracy, and achieve the effect of ensuring the acquisition speed and achieving simplicity.

Pending Publication Date: 2022-01-04
TIANJIN JINHANG COMP TECH RES INST
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose a time-frequency two-dimensional interpolation fine estimation method for direct-spread signals in view of the shortcomings of insufficient carrier Doppler frequency and pseudo-code phase estimation accuracy in the traditional capture method under high dynamics and signal-to-noise ratio

Method used

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  • Direct sequence spread spectrum signal time-frequency two-dimensional interpolation precise estimation method
  • Direct sequence spread spectrum signal time-frequency two-dimensional interpolation precise estimation method
  • Direct sequence spread spectrum signal time-frequency two-dimensional interpolation precise estimation method

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Embodiment 1

[0098] This embodiment illustrates the structural block diagram of applying the "a method for time-frequency two-dimensional interpolation and precise estimation of direct-spread signal" of the present invention to large frequency offset and low signal-to-noise ratio. In this embodiment, the radio frequency is f RF =2.2GHz, the period of the pseudo-code is 1023, and the chip rate is R cp = 3.069Mcps at a data rate of R D =2kbps, take the correlation time length as 1 pseudo-code period, and the carrier Doppler frequency as f d ∈(-200kHz,200kHz) as an example, by figure 1 It can be seen that the signal received by the receiver antenna is down-converted and sampled by the RF front-end, and then the frequency is searched in parallel, and the result is output to the FFT module. Correlation calculations are performed on the FFT results of the local pseudo-code sequence, and the signal-to-noise ratio is accumulated through the non-coherent accumulation module. After processing by t...

Embodiment 2

[0100] According to the parameters described in Embodiment 1, this embodiment specifically elaborates the time-frequency two-dimensional refined estimation results after performing steps 1 to 8 of the present invention. The results in the frequency domain are as follows figure 2 As shown, the time domain results are as image 3 shown;

[0101] figure 2 In , the abscissa represents the frequency difference after capture, and its unit is Hz; the ordinate represents the frequency difference after frequency refinement, and its unit is Hz;

[0102] from figure 2 It can be seen from the figure that in this embodiment, the maximum frequency difference after capture can reach 1kHz. After the carrier Doppler frequency is refined by this method, the maximum residual frequency difference does not exceed 90Hz, which greatly optimizes the frequency error after capture. , which is more conducive to the subsequent carrier tracking loop to quickly and stably lock the signal.

[0103] ...

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Abstract

The invention discloses a time-frequency two-dimensional interpolation precise estimation device for a direct sequence spread spectrum signal. The device comprises a receiver antenna, a radio frequency front end, a memory module, a parallel frequency search module, an FFT module, a pseudo code correlation module, an incoherent accumulation module, a peak detection module, a correlation accumulation storage module and a triangular envelope fitting module; wherein the radio frequency front end comprises a down-conversion unit and an AD sampling unit; the pseudo code correlation module comprises a pre-stored local pseudo code fast Fourier transform unit, a multiplication unit and an inverse fast Fourier transform unit; the parallel frequency search module comprises L frequency channels. The method is established on the basis of a traditional code domain parallel searching and capturing structure, and is easy to implement; according to the structure, an additional complex structure does not need to be added, the capturing speed is guaranteed, and time-frequency two-dimensional precise estimation can be rapidly and accurately completed under the condition that the capturing time is limited.

Description

technical field [0001] The invention belongs to the technical field of direct sequence spread spectrum communication and pseudocode phase and Doppler frequency fine estimation, and relates to a time-frequency two-dimensional interpolation fine estimation method of direct spread signal based on triangular envelope fitting. Background technique [0002] Direct Sequences Spread Spectrum (DSSS), as a signal processing method with good concealment, certain anti-interference and anti-interception capabilities, has been widely used in harsh environments such as satellite communications and deep space communications. Its signal processing process usually includes steps such as capture, tracking, and bit synchronization. Among them, the capture process is the first step in processing the DSSS signal, and its estimation effect will directly affect whether the follow-up tracking and bit synchronization can work accurately and stably. Therefore, The capture process is particularly impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/708H04B1/7075
CPCH04B1/708H04B1/7075H04B1/70753H04B1/70752
Inventor 郭一超
Owner TIANJIN JINHANG COMP TECH RES INST
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