Real-time and high-precision coherent pulse signal frequency measurement method

A pulse signal, high-precision technology, applied in the field of reconnaissance and detection, can solve the problems of multi-hardware resources, unsuitable multi-carrier frequency signal frequency measurement, and difficulty in taking into account anti-noise and other problems

Inactive Publication Date: 2015-03-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Each of these frequency measurement algorithms has some shortcomings, and it is difficult to take into account anti-noise, low calculation amount, multi-carrier frequency signal frequency measurement, etc.
For example, although the direct counting method is simple to implement and has a small amount of calculation, its anti-noise performance is poor, and it is not suitable for frequency measurement of multi-carrier frequency signals; the phase estimation method and frequency estimation method require more hardware resources, and cannot...

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  • Real-time and high-precision coherent pulse signal frequency measurement method
  • Real-time and high-precision coherent pulse signal frequency measurement method

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0035] see figure 1 , figure 2 As shown, a real-time high-precision coherent pulse signal frequency measurement method includes the following steps:

[0036] (1) The input signal cos (2 πf 0 t + φ ) for orthogonal processing to obtain its orthogonal component, and output the corresponding analytical signal exp( j * (2 πf 0 t + φ )).

[0037] (2) Use the discrete spectrum phase difference correction method to perform single-pulse frequency measurement on a received single-pulse signal. For example, if the first segment signal is taken as the (0, 2*PW / 3) part of the pulse signal, and the second segment signal is the (PW / 3, PW) part of the pulse signal, take the parameter T = 2*PW / 3, a 1 = 1 / 2, b 1 = 1 / 2, a 2 = 1. substitute c = 2 a 1 + 2 b 1 - 1, got c = 1, no blur correction frequency range (-1 / T , 1 / T ), which is g...

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Abstract

The invention provides a real-time and high-precision coherent pulse signal frequency measurement method, and belongs to the technical field of detection and reconnaissance. Single pulse frequency measurement is performed on a single pulse signal by utilizing a discrete frequency spectrum phase difference correction method firstly, and if frequency measurement precision reaches a certain range, fine correction is performed step by step by fully utilizing multiple pieces of coherent pulse information so that frequency measurement precision is enhanced; and if frequency does not reach the preset range, single pulse frequency measurement is performed on multiple single pulses respectively, frequency measurement results are accumulated and averaged and frequency is enabled to reach the preset range, and then fine correction is performed step by step by utilizing multiple pieces of coherent pulse information. Compared with existing methods, the method has advantages of high frequency measurement precision, high anti-noise capability, moderate computation amount and multi-carrier frequency signal frequency measurement capability.

Description

technical field [0001] The invention relates to a real-time high-precision coherent pulse signal frequency measurement method, which belongs to the technical fields of detection and reconnaissance. Background technique [0002] In the fields of detection, reconnaissance, positioning, and electronic countermeasures, the use of instantaneous frequency measurement technology to measure the frequency of the pulse signal of the received radiation source in real time and with high precision plays an important role in the detection, tracking, sorting, identification, and positioning of radiation sources. Frequency measurement methods mainly include analog frequency measurement and digital frequency measurement. Among them, digital frequency measurement has the advantages of flexible processing, good frequency measurement stability, and high precision, which is the future development trend. [0003] At present, there are many digital frequency measurement algorithms, such as direct...

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Application Information

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IPC IPC(8): G01R23/02G06F19/00
Inventor 林川
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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