Method and system for determining initial frequency of broadband linear frequency modulation pulse signal

A technology of linear frequency modulation pulse and initial frequency, which is applied in the direction of radio wave measurement systems and instruments, and can solve problems such as inability to process in real time and large amount of computation

Pending Publication Date: 2022-01-21
BEIJING INST OF REMOTE SENSING EQUIP
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Problems solved by technology

The commonly used method for estimating the initial frequency of a chirp signal is the maximum likelihood estimation method. This method can optimally estimate the center frequency and the frequency modulation slope of the chirp signal, and then use the center frequency and the frequency modulation slope to estimate the initial frequency. This method The obtained initial frequency estimate is accurate, but since the condition of known center frequency is not used, a two-dimensional search needs to be performed on the entire center frequency-FM slope plane, which requires a large amount of computation and cannot be processed in real time

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  • Method and system for determining initial frequency of broadband linear frequency modulation pulse signal
  • Method and system for determining initial frequency of broadband linear frequency modulation pulse signal
  • Method and system for determining initial frequency of broadband linear frequency modulation pulse signal

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[0061] In order to understand the characteristics and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present disclosure. In the following technical description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawings.

[0062] Such as figure 1 As shown, the method for determining the initial frequency of the broadband chirp signal provided by the present invention includes:

[0063] Step 100: Obtain discrete data of the broadband...

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Abstract

The invention discloses a broadband linear frequency modulation pulse signal initial frequency determination method and system. According to the method for determining the initial frequency of the broadband linear frequency modulation pulse signal, after discrete data of the broadband linear frequency modulation pulse signal are obtained, the discrete data are buffered to obtain buffered data, a continuous pulse signal can be converted into the discrete signal, after the cached data are preprocessed to obtain time domain data, under the condition that the center frequency of the broadband linear frequency modulation pulse signal is known and the frequency modulation slope is unknown, the initial frequency of the broadband linear frequency modulation pulse signal can be determined in real time according to the time domain data, and then problems that a common linear frequency modulation pulse signal initial frequency estimation method is large in calculation amount and cannot process in real time are solved.

Description

technical field [0001] The present invention relates to the technical field of estimating the initial frequency of a chirp signal, in particular to a method and system for determining the initial frequency of a broadband chirp signal. Background technique [0002] When the radar equipment is working, it is necessary to estimate the initial frequency of the broadband chirp signal under the condition that the center frequency of the broadband chirp signal is known and the frequency modulation slope is unknown. A linear frequency modulated (LFM) pulse signal is one in which the frequency of the signal is swept linearly up or down within the pulse width. The commonly used method for estimating the initial frequency of a chirp signal is the maximum likelihood estimation method. This method can optimally estimate the center frequency and the frequency modulation slope of the chirp signal, and then use the center frequency and the frequency modulation slope to estimate the initial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
CPCG01S7/4004
Inventor 段云鹏
Owner BEIJING INST OF REMOTE SENSING EQUIP
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