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Frequency Estimation Method of Coherent Pulse Signal under Pulse Loss

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

Active Publication Date: 2021-01-08
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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  • Frequency Estimation Method of Coherent Pulse Signal under Pulse Loss
  • Frequency Estimation Method of Coherent Pulse Signal under Pulse Loss
  • Frequency Estimation Method of Coherent Pulse Signal under 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 present invention proposes a method for estimating the frequency of coherent pulse signals under pulse loss. First, phase deambiguation processing and single-pulse-level frequency estimation are performed within the pulse range; secondly, phase deambiguation processing with two pulses as a group is performed twice. and frequency estimation, and obtain the position information of the pulse loss; again, according to the position information of the pulse loss, the coherent pulse train is divided into several large segments, and the effective minimum number of pulses in all the large segments is used as the segment length to fine-tune the large segment and carry out frequency estimation at the sub-segment level, remove small segments with too large errors, and synthesize the remaining small segments to obtain frequency estimates; finally, search for the large segment with the most continuous effective small segments, and combine the continuous effective small segments in these large segments to form The observation interval is used to perform frequency estimation at the observation interval level, and the average value is taken as the final frequency estimation value. The invention can still accurately estimate the frequency of the coherent pulse train under the condition of pulse loss.

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 Patents(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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