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A Parameter Identification Method for Intermittent Sampling-Repeat Interference

A technology of forwarding interference and parameter identification, applied in radio wave measurement systems, instruments, etc., can solve problems such as complex parameter identification methods, achieve refined identification, remove noise, and achieve the effect of confrontation

Active Publication Date: 2022-05-17
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the complex problem of the existing parameter identification method of intermittent sampling and forwarding interference, the present invention provides a simple and high-precision parameter identification method of intermittent sampling and forwarding interference

Method used

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  • A Parameter Identification Method for Intermittent Sampling-Repeat Interference
  • A Parameter Identification Method for Intermittent Sampling-Repeat Interference
  • A Parameter Identification Method for Intermittent Sampling-Repeat Interference

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Embodiment 1

[0038] Embodiment 1: This embodiment is a parameter identification method for intermittent sampling and forwarding interference. The radar transmission signal is a chirp signal. where T w is the pulse width, K r is the frequency modulation slope. Intermittent sampling and forwarding interference can be in the form of direct forwarding, repeated forwarding, and cyclic forwarding. Taking intermittent sampling and repeating forwarding interference as an example, sampling N times within a single pulse width, each sampling slice is forwarded M times, and the form of the interference signal is where T I is the slice width, T u =(M+1)T I is the time interval between two adjacent samples, and τ is the slice delay, including forwarding delay and propagation delay. Radar echoes include target signals, interference signals and noise.

[0039] Such as figure 1 As shown, the method of the present embodiment includes:

[0040] Step 11. Obtain the echo signal of the radar, which is...

Embodiment 2

[0049] Embodiment 2: This embodiment is an identification method of intermittent sampling forwarding interference, according to the signal x opt (u) distribution characteristics and the estimation result of the interference parameter, determine the strategy of intermittent sampling forwarding interference, the method of the present embodiment comprises:

[0050] The method of embodiment 1 is used to identify the parameters of the intermittent sampling and forwarding interference of the radar transmission signal, and obtain the parameter identification result;

[0051] when x opt The peaks of (u) are evenly distributed, and the distance between each adjacent peak is equal. The intermittent sampling and direct forwarding interference strategy is adopted, and the identified parameters are used for sampling and forwarding;

[0052] when x opt The distance between each adjacent peak of (u) is not equal, and the peaks present a periodic distribution. The maximum adjacent peak spac...

Embodiment 3

[0054] Embodiment 3: This embodiment is a countermeasure against intermittent sampling and forwarding interference. According to the interference parameter estimation result, the location of the interference is determined, and a narrowband filter is constructed to perform interference filtering to achieve interference suppression. The method of this embodiment includes:

[0055] S31. Calculate the optimal order a of the fractional Fourier transform of the transmitted chirp signal:

[0056] where f s is the sampling frequency, N s is the number of sampling points, K r Indicates the frequency modulation slope; N s =T w × f s ;

[0057] S32. Using the calculated optimal order a to perform fractional Fourier transform on the radar echo:

[0058]

[0059] Among them, K α (t,u) is the kernel function, α=aπ / 2, S r (t) represents the radar echo signal;

[0060] The interference signal is generated by storing, truncating and delaying the forwarding of the radar signal. Ac...

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Abstract

A parameter identification method for intermittent sampling and forwarding interference solves the complex problem of the existing parameter identification method for intermittent sampling and forwarding interference, and belongs to the technical field of radar active interference countermeasures. The method includes: S1, segmenting the radar echo by using a truncated rectangular window, performing an optimal order fractional Fourier transform on each segment of the signal, and then splicing; S2, changing the length of the truncated rectangular window, using S1 Obtain multiple spliced ​​signals, and search out the signal x with the lowest complexity among the multiple spliced ​​signals opt (u), and according to the signal x opt The distribution characteristics of (u) identify the estimation results of the interference parameters. According to the distribution characteristics of the peak pulse of the processing results and the identified parameters, the fine identification of the specific forwarding strategy of the interference can be realized; the fractional Fourier transform filtering technology of the linear frequency modulation signal can be used to filter out the interference signal and retain the target signal, and at the same time Remove noise, so as to realize the countermeasure against intermittent sampling and forwarding interference.

Description

technical field [0001] The invention relates to an identification method and a countermeasure method for intermittent sampling and forwarding interference, and belongs to the technical field of radar active interference countermeasures. Background technique [0002] With the large-scale application of jammers based on digital radio frequency storage technology in actual combat, the complexity of jamming signals has further increased. Based on the ability of digital radio frequency memory to intercept and store radar transmission signals, intermittent sampling and forwarding jamming has developed rapidly. It mainly achieves radar jamming by intermittently sampling and forwarding a single radar pulse signal. The jammer intercepts the large-time-width radar signal, samples a small section of the signal with high fidelity, and immediately processes and forwards it, and then samples, processes and forwards the next section, and the sampling and forwarding work alternately in time...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 于雷位寅生孟芸芸陈雨时沙明辉李迎春
Owner HARBIN INST OF TECH