Method and apparatus for pulse compression processing the linear frequency modulation signal by CORDIC

A linear frequency modulation signal and pulse compression technology, which is applied in the direction of multi-frequency modulation and transformation, and can solve the problems of difficult multi-channel receiver design, high data rate, and large amount of calculation.

Inactive Publication Date: 2009-08-05
WUHAN UNIV
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Problems solved by technology

[0017] The purpose of the present invention is to overcome the shortcomings of the prior art that the amount of calculation is large, the data rate is high, and complex numbers need to be multiplied, and it is not easy to design a multi-channel receiver. Calculator) method and device for performing pulse compression processing on a linear frequency modulation signal, by treating the received signal as a plane vector, reasonably setting the CORDIC input phase, and efficiently realizing the digital pulse compression processing of the linear frequency modulation signal

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  • Method and apparatus for pulse compression processing the linear frequency modulation signal by CORDIC
  • Method and apparatus for pulse compression processing the linear frequency modulation signal by CORDIC
  • Method and apparatus for pulse compression processing the linear frequency modulation signal by CORDIC

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Embodiment Construction

[0074] Describe below in conjunction with accompanying drawing:

[0075] figure 1 It is a flow chart of digital pulse compression processing. figure 1 The middle marks are: ① phase accumulator; ② CORDIC operation unit; ③ decimator; ④ FFT processing unit.

[0076] figure 2 Block diagram of a digital receiver. figure 2 The marks in are: ⑤ pre-filter; ⑥ digital-to-analog converter; ⑦ FPGA chip; ⑧ USB communication chip; ⑨ crystal oscillator.

[0077] The block diagram of the digital receiver system is as follows figure 2 As shown, it includes pre-filter ⑤, digital-analog converter ⑥, FPGA chip ⑦, USB communication chip ⑧, crystal oscillator ⑨ and computer PC, pre-filter ⑤, digital-analog converter ⑥, FPGA chip ⑦, USB communication The chip ⑧ is electrically connected to the computer PC in turn, the crystal oscillator ⑨ is electrically connected to the digital-to-analog converter ⑥ and the FPGA chip ⑦ respectively, and the phase accumulator ① and the CORDIC operation unit ...

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Abstract

The invention discloses a method and a device used for carrying out pulse compression processing to a chirp signal by a coordinate rotations digital computer (CORDIC) arithmetic; the key point of the method is that: by arranging CORDIC, the increment of the input phase is gradually increased or reduced linearly by time; simultaneously, functions of digital down converter, digital orthogonalization and de-ramp are realized. Compared with the existing digital receiver, the internal of the digital receiver does not need memorize reference waveform; furthermore, all operations are completed by addition, reduction and replacement, thereby having extremely high efficiency.

Description

technical field [0001] This patent relates to a digital pulse compression processing technology for linear frequency modulation signals. Background technique [0002] As an application of matched filtering, pulse compression has the advantage that it can transmit a signal with a long duration and low peak power, and perform pulse compression at the receiving end to achieve a short duration and high peak output. Therefore, The requirement of long-distance high-resolution can be realized by using lower transmission power. With the development of digital technology, the advantages of digital pulse processing over analog pulse compression processing are very obvious, and digital pulse compression has become the first choice for receiver design. [0003] Commonly used digital pulse compression techniques involve complex number multiplication, storage of reference waveforms, FFT (Fast Fourier Transform, Fast Fourier Transform) unit and IFFT (Inverse Fast Fourier Transform, invers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/16
Inventor 文必洋颜志升王才军姜大鹏
Owner WUHAN UNIV
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