Doppler inhibition method based on constructed complementary code pair

A complementary code and construction technology, applied in the field of signal processing, can solve problems such as poor autocorrelation characteristics and high sidelobes, and achieve the effects of eliminating the influence of Doppler, improving the main-sidelobe ratio, and good autocorrelation characteristics

Inactive Publication Date: 2013-09-18
XI AN JIAOTONG UNIV
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Problems solved by technology

But the codewords he chose are ordinary random binomial codes, and their autocorrelation characteristics are not very good, so there are still high side lobes after processing
[0004] Therefore, if a method can not only eliminate the influence of Doppler effect but also obtain a higher main side lobe ratio, then in radar and communication systems, this method will bring great benefits

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  • Doppler inhibition method based on constructed complementary code pair
  • Doppler inhibition method based on constructed complementary code pair
  • Doppler inhibition method based on constructed complementary code pair

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Embodiment Construction

[0021] see Figure 1 to Figure 3 As shown, the present invention selects a complementary code pair with an appropriate length as an optimal code according to needs, then generates its corresponding constructed code pair, and uses the constructed complementary code pair as a phase modulation signal. At the receiving end, the two pulse sequences are processed separately to eliminate the influence of Doppler, and then matched filtering is performed separately, and finally the main-sidelobe ratio is improved by using the complementary characteristics between the two sequences.

[0022] A kind of Doppler suppression method based on constructing complementary code pair of the present invention comprises the following steps:

[0023] (1), select a set of complementary code pairs at the transmitter (s 1 ,s 2 ) as the optimal code, and its corresponding constructed code pair is (a 1 ,a 2 ); at the transmitter end with (a 1 ,a 2 ) are used as phase modulation signals, and are tran...

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Abstract

The invention discloses a Doppler inhibition method based on a constructed complementary code pair. The Doppler inhibition method comprises the following steps of selecting the complementary code pair with proper length as an optimal code as required; generating a constructed code pair corresponding to the optimal code; taking the constructed complementary code pair as a phase modulation signal; respectively processing two impulse sequences at a receiving end to eliminate the Doppler influence; respectively carrying out matched filtering; finally improving main sidelobe ratio by utilizing complementary characteristics between the two sequences. With the adoption of the Doppler inhibition method based on the constructed complementary code pair, not only can the Doppler influence be completely eliminated, but also better self-correlated characteristics can be acquired.

Description

【Technical field】 [0001] The invention belongs to the field of signal processing, in particular to a Doppler suppression method based on constructing complementary code pairs. 【Background technique】 [0002] Complementary codes have very good correlation characteristics, but when Doppler exists, their side lobes will be significantly improved, which limits its application. Ali Pezeshki and Calderbank et al. in "Doppler Resilient Golay Complementary Waveforms" proposed a form of waveform emission with Doppler suppression effect. In this scheme, PTM (Prouhet-Thue-Morse) sequence is used to limit the order of the transmitted complementary code pairs, so as to achieve the effect of suppressing side lobes. However, this method is only effective when the Doppler shift is small, and when the Doppler is large, the side lobe will still be large. [0003] Cheng Yuping, Zhao Pufu and others proposed a constructed binomial code to eliminate the influence of Doppler in the article "Dop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
Inventor 侯兴松张昆鹏
Owner XI AN JIAOTONG UNIV
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