A kt-lvt-based dynamic focusing method for anti-symbol-hopping direct spread spectrum signals

A technology of dynamic focus and spread spectrum signal, which is applied in the field of aerospace measurement and control communication, can solve problems such as spectrum peak splitting and energy cancellation, and achieve low signal-to-noise ratio, elimination of symbol jump, and high processing gain

Active Publication Date: 2019-04-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, under the direct spread signal model, due to the phenomenon of symbol jumps in the long-term accumulation process, the conventional dynamic focusing method will have problems of energy offset and spectral peak splitting. Therefore, the KT-LVT dynamic focusing method is used for direct spread signals. It is also necessary to consider the influence of symbol modulation, improve the KT-LVT algorithm, and design a dynamic focusing method based on KT-LVT to resist symbol jumping

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  • A kt-lvt-based dynamic focusing method for anti-symbol-hopping direct spread spectrum signals
  • A kt-lvt-based dynamic focusing method for anti-symbol-hopping direct spread spectrum signals
  • A kt-lvt-based dynamic focusing method for anti-symbol-hopping direct spread spectrum signals

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Embodiment Construction

[0040] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0041] The principle of the KT-LVT method based on the square operation is as follows:

[0042] Let N be the number of partial correlation points, T c is the partial correlation time, K is the number of partial correlation segments, and KT c is greater than or equal to a pseudo code period, in the case of no noise interference, the complex baseband signal at the receiving end can be expressed as

[0043]

[0044] Among them, T s =sT c is the delay time in the segment, T k = kT c is the delay time between segments, c is the speed of light, A is the signal amplitude, R 0 (T k ) is the distance between transmitter and receiver

[0045]

[0046] Among them, a 0 is the initial distance between the radar and the target, a 1 is the first-order target dynamic parameter, a 2 is the second-order objective dynamic parameter.

[0047] The local signa...

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Abstract

The invention discloses a symbol jumping resistant direct spread spectrum signal dynamic focusing method based on KT-LVT. The invention adopts a KT-LVT dynamic focusing method for resisting symbol jumping based on delay correlation, the influence of the symbol jumping is eliminated when the pseudo-code phase distance migration and the Doppler frequency migration are eliminated, so that the direct spread signal dynamic focusing under the low signal to noise ration and high dynamic scene is realized. Compared with the non-search type dynamic focusing method, the signal to noise ratio loss caused by non-linear operation in the method is small, the processing gain is high, good noise resistance is provided, and the method is more suitable for capturing a weak signal; and meanwhile, this method is unnecessary to timely traverse and compensate the local pseudo code rate and the Doppler frequency, and unnecessary to search the symbol jumping edge, so that the computation burden is low, the storage content is small and the instantaneity is high in comparison with the non-iterative non-search type dynamic focusing method.

Description

technical field [0001] The invention belongs to the technical field of aerospace measurement and control communication, and in particular relates to a KT-LVT-based dynamic focusing method for anti-symbol-hopping direct spread spectrum signals. Background technique [0002] Direct Sequence Spread Spectrum (DSSS) signals have the advantages of strong anti-interception and anti-jamming capabilities, and can realize code division multiple access, and are widely used in aerospace measurement and control communications, satellite navigation, and mobile communications. The capture of weak DS signals requires long-term effective energy accumulation. To increase the signal accumulation time length, it is necessary to consider the impact of symbol hopping and the dynamic impact of the received signal introduced by the relative motion of the transceiver and the receiver. Among them, the symbol hopping during the accumulation time will cause the signal energy corresponding to different...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7075
CPCH04B1/7075
Inventor 申宇瑶汪文韬王永庆吴嗣亮于秀丽马淑芬陈岩
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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