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Accurate and efficient realization method and device of linear frequency modulation signal autocorrelation operation

A technology of linear frequency modulation signal and autocorrelation operation, applied in the field of signal processing, can solve the problems of discarding stored data, complex realization structure, and low operation precision, and achieves the effect of no drift in operation precision, fast operation speed, and high operation precision.

Active Publication Date: 2022-03-25
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to solve the problems existing in the above-mentioned existing signal autocorrelation calculation implementation method at least to a certain extent, such as low calculation accuracy, drift of calculation results, complex implementation structure, large volume, low memory utilization efficiency and Part of the stored data is discarded and other issues

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  • Accurate and efficient realization method and device of linear frequency modulation signal autocorrelation operation
  • Accurate and efficient realization method and device of linear frequency modulation signal autocorrelation operation
  • Accurate and efficient realization method and device of linear frequency modulation signal autocorrelation operation

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Embodiment 1

[0040] like figure 1 Shown is a flow chart of an accurate and efficient implementation method for chirp signal autocorrelation operations, and the accurate and efficient implementation method for chirp signal autocorrelation operations includes the following steps:

[0041] In step S101, the input analog chirp signal is sampled and quantized, and the sampling rate is f s , to obtain the digitized N-dimensional signal vector s(n);

[0042]In step S102, the signal after sampling and quantization is buffered and output to the corresponding FIR filter in the FIR filter bank according to the sampling time sequence, that is, the sampling point s(0) is output to the FIR filter 0, and the sampling point s(1 ) is output to FIR filter 1, sampling point s(2) is output to FIR filter 2, and so on, sampling point s(N-1) is output to FIR filter N-1;

[0043] In step S103, each FIR filter delays the input sampling points (using the signal sampling period as the minimum delay unit to delay s...

Embodiment 2

[0046] This embodiment is similar to Embodiment 1, the difference is that the FIR filter can be implemented by using an FFT (FastFourier Transform, Fast Fourier Transform) algorithm, and the operation speed is relatively fast.

[0047] In addition, memory such as ROM (Read-Only Memory, read-only memory) is used to store the coefficients of the FIR filter bank, and the implementation cost is relatively small.

Embodiment 3

[0049] Corresponding to Embodiment 1 and Embodiment 2, this embodiment sets a finite-length discrete complex LFM signal:

[0050]

[0051] Among them: N is the number of sampling points, the value is a positive integer, n is used to represent the serial number of discrete sampling points, n=0,1,2,...,N-1, f 0 Represents the starting frequency of the complex LFM signal, k represents the frequency modulation slope of the complex LFM signal, f s Indicates the sampling rate, and s(n) indicates the acquired N-dimensional signal vector.

[0052] In the autocorrelation function R(m) of the signal s(n), m is used to represent the delay amount, and the value of m is an integer. When 0≤m≤N-1, the autocorrelation function of the signal s(n) is expressed as:

[0053]

[0054] For the discrete signal s(n), it is numerically the same as s(m), that is, the value of the signal sample with sequence number m can be used to replace s(m) in the above formula. For each determined delay m,...

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Abstract

The invention discloses an accurate and efficient realization method and device for linear frequency modulation signal autocorrelation operation. The method includes: quantization step, buffer step, filter step and output step. Each unit of the device for accurately and efficiently realizing the autocorrelation operation of the linear frequency modulation signal corresponds to the method. The present invention provides an accurate and efficient implementation method and device for the autocorrelation operation of the chirp signal. The biggest feature of the method is to use the FIR filter bank to realize the autocorrelation operation of the chirp signal. The overall effect is parallel processing through the FIR filter The architecture can realize simultaneous output of autocorrelation results with different delays. The FIR filter can be realized by using the FFT algorithm, and the operation speed is relatively fast. The method also has the advantages that the processing signal is a digital quantity, the calculation accuracy is high and there is no drift; it is suitable for high-speed parallel multi-channel digital signal processing; the memory can be used efficiently, and in some application scenarios, the FIR filter bank can be stored in a memory such as ROM. coefficient, the implementation cost is small.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to an accurate and efficient method for realizing the autocorrelation operation of the chirp signal, and also relates to an accurate and efficient implementation device for the autocorrelation operation of the chirp signal. Background technique [0002] Linear frequency modulated signal (LFM: linear frequency modulated signal) is a typical signal that obtains a large time-width bandwidth product through nonlinear phase modulation, and is one of the signal waveforms often used in modern high-performance system radars. In the detection of the linear frequency modulation signal, the method of matched filtering can be adopted, which can obtain higher processing gain. But the design of the matched filter requires to know the duration of the signal, which is difficult to do when the input signal-to-noise ratio is very low and the waveform is seriously distorted. Since the autocorrelation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/148H04L27/22
CPCH04L27/148H04L27/22
Inventor 王茂汶周涛钟欣刘静娴陈智宇
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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