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Tracking-before-detection method for weak maneuvering targets based on discrete variable-rate sampling

A weak target detection, variable rate technology, applied in measurement devices, radio wave measurement systems, radio wave reflection/re-radiation, etc. Small tracking error, avoiding the effect of interpolation operations

Active Publication Date: 2017-02-22
江苏通月空调有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of the existing radar maneuvering weak target tracking method before detection, such as large storage capacity, large amount of calculation, and poor real-time performance, and can further improve the detection probability and reduce the tracking error at the same time

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  • Tracking-before-detection method for weak maneuvering targets based on discrete variable-rate sampling
  • Tracking-before-detection method for weak maneuvering targets based on discrete variable-rate sampling
  • Tracking-before-detection method for weak maneuvering targets based on discrete variable-rate sampling

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Embodiment Construction

[0008] The following combination figure 1 The steps of the present invention are described as follows:

[0009] Step 1. Particle initialization.

[0010] (1) Particle state initialization: randomly sample and generate N particles according to the initial probability density distribution of particles:

[0011]

[0012] in, is the state vector of N particles, p(x 0 ) is the known probability density.

[0013] (2) Particle existence variable initialization: given the target birth and death probabilities are p b and p d (generally take p b =p d = 0.05 or 0.1). The particle existence variable is and make N x P b The initial existence variable of one particle is 1, and the initial existence variable of other particles is 0.

[0014] (3) Particle arrival time initialization: initialize the arrival time of each particle is the arrival time t of the first measurement data 0 . Initialize the neighborhood of each particle at the first measurement moment so that it onl...

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Abstract

The invention discloses a mobile dim target tracking-before-detecting method based on discrete variable rate sampling. According to the invention, firstly a particle is initialized and particle variables undergo one-step prediction; secondly, a first particle state prediction is carried out, and after introduction of state variables, the state prediction is carried out again; thirdly, the particle weight is calculated and normalized, and the particle undergoes a second weighted operation; and finally, a current target detection probability and state are estimated. In the particle state prediction process, the invention proposes a novel discrete variable rate sampling method for sampling particles. According to the invention, the mobile dim target tracking-before-detecting in the complex background environment is realized; and the great reliability, feasibility and real-time performance are realized.

Description

technical field [0001] The invention belongs to the field of radar data processing, and relates to a fast tracking algorithm for maneuvering weak targets before detection based on discrete variable rate sampling. Background technique [0002] At present, the airborne early warning radar low-altitude detection technology uses target detection (signal processing) and target tracking (data processing) as two independent links. Detection and object tracking. However, when the signal-to-noise ratio of the target is low, because the detection link simplifies the measurement data and loses some information in the original measurement, it is usually difficult to find the signal of the weak target. The tracking-before-detection algorithm based on Bayesian filtering is usually used to solve the problem of detection and tracking of radar weak targets. This technology can directly use the original radar observation data, fully mine the data information and improve the signal-to-noise ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/66
CPCG01S7/02G01S13/66
Inventor 郭云飞唐学大郭春生彭冬亮郭宝峰
Owner 江苏通月空调有限公司
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