Rapid capture method based on GPS pulse per second

A pulse-per-second, fast technology, applied in electrical components, transmission systems, time-division multiplexing systems, etc., can solve problems such as high complexity and inability to achieve capture, achieve low overhead, increase network communication efficiency, and ensure capture. The effect of sensitivity

Inactive Publication Date: 2020-12-18
SHANGHAI RADIO EQUIP RES INST
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  • Application Information

AI Technical Summary

Problems solved by technology

The complexity of the algorithm is relatively high, and at the same time, it cannot realize the capture of 1 PN code cycle

Method used

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  • Rapid capture method based on GPS pulse per second
  • Rapid capture method based on GPS pulse per second
  • Rapid capture method based on GPS pulse per second

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Embodiment Construction

[0023] based on the following Figure 1 to Figure 4 , specifically explain the preferred embodiment of the present invention.

[0024] In a communication system, signal acquisition speed, Doppler dynamic range, acquisition sensitivity, etc. are key indicators for acquisition. Signal acquisition means continuous acquisition operations until the arrival moment of the signal is found, and the frequency and bit The synchronization timing is estimated to be within a certain accuracy, and based on this, the subsequent accurate frequency estimation and bit timing can be performed. The only way to increase the sensitivity of signal capture is to increase the integration time of the signal.

[0025] In the process of network communication of multiple wireless communication nodes, when the TDD mode is used for communication, when the number of nodes is large, the communication transmission time of each node will inevitably be reduced, and the communication rate will inevitably increase...

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Abstract

The invention relates to a rapid capture method based on GPS pulse per second, which comprises the following steps: each node directly performs networking communication through a TDD mode, synchronizes time slot references of each node through the GPS pulse per second, and calculates path delay between a sending node and a receiving node according to GPS position information of the nodes; a multi-channel code generator and a correlator are adopted for carrying out autocorrelation operation to achieve time synchronization, Fourier transform FFT is carried out on multi-channel autocorrelation results, the maximum value of each path of FFT is obtained, one path of FFT maximum value is found out from the multi-channel FFT maximum values, a time synchronization position is found out according to an FFT channel where the FFT maximum value is located, and Doppler frequency is captured; and the latest GPS position information of the node is obtained to update the path delay between the sendingnode and the receiving node, and continuing to perform time synchronization and frequency capture. The method improves the communication efficiency, enlarges the Doppler capturing range, guarantees the capturing sensitivity, is easy to implement, and is low in resource consumption.

Description

technical field [0001] The invention relates to a fast acquisition method based on GPS second pulse. Background technique [0002] With the continuous development of wireless transmission technology, the communication between wireless transmission devices is no longer as simple as point-to-point communication. The networking transmission and time synchronization between different devices are also the focus of people's research. In the network transmission mode under Time Division Duplexing, for a network with many nodes, each node occupies less transmission time in each time slot, so the synchronization header overhead of the signal must not take up too much time, and the signal The design of the sync head and the corresponding capture time are key indicators, which directly affect the capacity and delay time of the network. While the capture speed needs to be fast enough, it is also necessary to take into account the capture sensitivity of the signal to ensure reliable tran...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H04B1/7075H04B1/7087H04J3/06
CPCH04B1/7075H04B1/7087H04J3/0644H04J3/0647H04J3/0682
Inventor徐哲林加涛施群张艳
OwnerSHANGHAI RADIO EQUIP RES INST