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High Dynamic Bias Online Estimation Method Based on Cross-Fuzzy Interval Judgment under Uniform Fuzzy Conditions of Range Measurement and Velocity Measurement

A fuzzy interval and fuzzy condition technology, applied in the field of radar signal and data processing, can solve the problems that the radar cannot lock the specific position information of the target, cannot obtain the effective speed information of the target, and cannot effectively identify the return time, so as to achieve high dynamic deviation compensation Processing, real-time detection, good detection effect

Active Publication Date: 2020-03-03
NAVAL AVIATION UNIV
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Problems solved by technology

On the one hand, under the condition of ambiguous radar ranging, the return time of different echoes cannot be effectively identified, and the radar cannot lock the specific position information of the target; This leads to confusion in speed measurement, and the effective speed information of the target cannot be obtained.

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  • High Dynamic Bias Online Estimation Method Based on Cross-Fuzzy Interval Judgment under Uniform Fuzzy Conditions of Range Measurement and Velocity Measurement
  • High Dynamic Bias Online Estimation Method Based on Cross-Fuzzy Interval Judgment under Uniform Fuzzy Conditions of Range Measurement and Velocity Measurement
  • High Dynamic Bias Online Estimation Method Based on Cross-Fuzzy Interval Judgment under Uniform Fuzzy Conditions of Range Measurement and Velocity Measurement

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Embodiment Construction

[0043] The online estimation method of high dynamic deviation under the condition of ambiguity in range measurement and speed measurement will be described below with reference to the accompanying drawings.

[0044] Implementation conditions: Assume that the initial position of the hypersonic target in the near space is [300km, 300km, 20km], the flight speed is 5000m / s, and the flight direction is 30°northwest. Correspondingly, the position of the observation radar is [0km, 0km, 0km], the radar wavelength is λ=0.15m, the chirp signal width is τ=600μs, the chirp bandwidth is B=1.5MHz, the radar distance, azimuth and pitch The measurement errors are 100m, 0.1° and 0.1° respectively, and the observation period is 1s. Refer to attached figure 1 , the specific implementation steps are as follows:

[0045] (1) The radar uses the LFM signal to detect the target and obtains 30 frames of measurement data, among which the impact of high dynamic deviation + measurement blur on target m...

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Abstract

The invention belongs to the field of radar signal and data processing, and provides a high-dynamic deviation online estimation method based on cross-fuzzy interval judgment for the high-dynamic deviation real-time estimation problem under the distance and velocity measurement ambiguity condition. In the study of the problem, the high-dynamic deviation online estimation method comprises the steps of: firstly, utilizing a distance differential method to obtain target radial velocity estimations at different moments; secondly, performing mutation judgment on radial velocities at adjacent moments, finding out cross-fuzzy interval radial velocity estimations, and making compensation for the radial velocity estimations; thirdly, performing median filtering processing on the plurality of compensated radial velocity estimations, so as to obtain velocity ambiguity-resolving measurement; and finally, performing online estimation on high-dynamic distance-delay deviation by utilizing velocity ambiguity-resolving measurement. The high-dynamic deviation online estimation method can effectively solve the high-dynamic deviation estimation problem under the distance and velocity measurement ambiguity condition, and has good effect when a target moves cross the fuzzy interval.

Description

technical field [0001] The invention relates to the field of radar signal and data processing, and is used for solving the problem of high dynamic deviation real-time estimation under the condition of fuzzy ranging and speed measuring. Background technique [0002] In the research on early warning and detection of hypersonic targets in near space, LFM signals are widely used in current radar systems due to their advantages of large time-width-bandwidth product. However, in the study of early warning and detection of nearby space targets using LFM signals, due to the range-velocity coupling, there will be a certain dynamic deviation in radar measurement. This deviation can usually be ignored when the radial velocity of the target is small, but when the target has a large radial velocity, it will seriously affect the radar's detection and tracking performance of the target. For this reason, how to realize the estimation of high dynamic deviation is a key problem that needs to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40G01S13/58
CPCG01S7/40G01S13/584
Inventor 王国宏张翔宇黄婧丽李岳峰
Owner NAVAL AVIATION UNIV
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