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Coherent pulse signal frequency estimation method considering pulse loss

A technology of frequency estimation and pulse loss, which is applied in the direction of frequency measurement device, frequency to phase shift conversion, measurement device, etc., can solve the problem of low accuracy of radar signal frequency estimation

Active Publication Date: 2019-01-25
YANGZHOU UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to propose a method for estimating the frequency of coherent pulse signals under pulse loss, and to solve the problem that the accuracy of frequency estimation of existing radar signals is not high

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  • Coherent pulse signal frequency estimation method considering pulse loss
  • Coherent pulse signal frequency estimation method considering pulse loss
  • Coherent pulse signal frequency estimation method considering pulse loss

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Embodiment 1

[0116] The flow of this embodiment is as follows figure 1 shown. Suppose the sampling frequency is 100MHz, the observation time is 0.012 seconds, the radar signal carrier frequency is 21.56789MHz, the pulse repetition frequency is 20KHz, the pulse width is 0.25 microseconds, the signal-to-noise ratio is 20, and the pulse loss rate is 0.1, then the entire pulse observation time The number of pulses sent within P 0 The number of pulses actually received is 216, the number of sampling points in each pulse is 25, and the number of sampling points in each pulse repetition period is 5000. The frequency estimation method of coherent pulse signal under pulse loss, the specific steps are as follows:

[0117] Step 1. Extract the fuzzy phase of the coherent pulse, and perform phase defuzzification processing within a pulse range, and then perform frequency estimation on each pulse, and obtain a frequency estimation value after averaging.

[0118] 11) Extract the fuzzy phase of the coh...

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Abstract

The invention provides a coherent pulse signal frequency estimation method considering pulse loss. The method includes the following steps that: phase de-blurring processing and single-pulse level frequency estimation are performed in a pulse range; phase de-blurring processing and frequency estimation are performed twice with two pulses adopted as a group, and pulse loss position information is obtained; a coherent pulse train is divided into a plurality of large segments according to the pulse loss position information, large segments are subdivided with the minimum number of valid pulses inall the large segments taken as segment division length, small-segment-level frequency estimation is performed on small segments, and small segments with too much error are eliminated, and a frequency estimation value is obtained through integrating the remaining small segments; and finally, large segments with the largest number of consecutive valid small segments are searched, and the consecutive valid small segments in the large segments form an observation interval, and observation-interval-level frequency estimation is performed, and an average value is solved and is adopted as a final frequency estimation value. With the method adopted, the frequency of the coherent pulse train can be accurately estimated under a pulse loss condition.

Description

technical field [0001] The invention belongs to the technical field of electronic countermeasures, and in particular relates to a method for estimating the frequency of a coherent pulse signal under pulse loss. Background technique [0002] Passive positioning is a very important means in electronic reconnaissance. It passively receives the electromagnetic waves of the radiation source without radiating any signals, measures its parameters, and secretly determines the position and motion state of the radiation source. . The positioning is to use the set of measured parameter values ​​to estimate the position of the radiation source, and the tracking not only needs to estimate the position of the radiation source, but also estimates the parameters such as the velocity and acceleration of the radiation source. Single-station passive positioning and tracking technology refers to the technology of using one observation platform to locate and track the target radiation source. T...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/12G01S5/02
CPCG01R23/12G01S5/021
Inventor 姚志均高锐杨睛
Owner YANGZHOU UNIV
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