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High-accuracy dynamic threshold target monitoring method with chirping characteristics

A dynamic threshold and high-precision technology, applied in the field of communication, can solve problems such as detection ambiguity, time resolution and frequency resolution contradictions, and achieve low-cost and easy-to-obtain effects

Active Publication Date: 2013-12-11
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] To sum up, due to the problem of detection ambiguity when the detection target is relatively close, and there are always contradictions in the two aspects of time resolution and frequency resolution, an effective method is needed to comprehensively determine the high-precision detection of the two dimensions

Method used

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  • High-accuracy dynamic threshold target monitoring method with chirping characteristics
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  • High-accuracy dynamic threshold target monitoring method with chirping characteristics

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Embodiment Construction

[0022] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] figure 1 Schematically shows the influence of moving objects on pulse compression radar detection. Wherein 101 is a detection radar with pulse compression function, 102 is a moving flying body, f d = 2vλ -1 cosθ, where v is the velocity of the object, θ is the angle between the direction of the object’s movement and the beam direction of the radar, and λ is the wavelength used by the radar. For the object moving in the direction of the radar, only the velocity component of its radial motion will produce Doppler Le frequency shift, and the vertical direction will not have any influence, therefore, the velocity needs to be decomposed first, and the velocity component that generates the Doppler component is calculated. For an object moving in the direction approaching the radar, since the direction of the moving object is opposite to that of the e...

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Abstract

The invention relates to the field of communication. The embodiment of the invention discloses a high-accuracy dynamic threshold target monitoring method with chirping characteristics. The method of the embodiment comprises a comprehensive evaluation way for time resolution and frequency resolution, a system structure having the chirping characteristics, a threshold determining method based on a fuzzy pattern under a plurality of targets, a rapid analysis method for the fuzzy pattern of a chirped pulse sequence, and an adaptive dynamic threshold adjustment process. According to the method, the rotation of the fuzzy pattern can be realized and a complicated adjustment of the positioning accuracy of a time-frequency domain can be finished by introducing chirps into transmission pulse signals and adjusting the frequency of a local oscillation signal source with the help of a voltage controlled oscillator. The fuzziness degree between targets is determined at a receiving end according to the analysis of frequency domain signals, and the resolution fuzziness degree is reduced in a pulse width control mode. According to system requirements, the fuzzy pattern is rotated to finish the optimization of the time-frequency domain. For overlap sections of the fuzzy pattern of the targets, an adjacent error determination threshold can be obtained in a polar coordinate mapping mode, and the computation of the fuzzy pattern of the pulse sequence with the chirping characteristics is simplified to ensure that the fuzzy pattern has the possibility of practical use. The high-accuracy dynamic threshold target monitoring method adopts a dynamic adjustment mode to realize adaptive, and feedback loop signals are easy to obtain, so the method has the characteristics of low cost and the like and can realize an adaptive high-accuracy radar measurement system.

Description

technical field [0001] The invention relates to the communication field, in particular to a high-precision dynamic threshold target monitoring method with chirp characteristics. Background technique [0002] Promoted by related technological progress and application requirements, pulse sequence linear frequency modulation radar is gradually applied to short-range high-resolution multi-target detection and imaging. With the enhancement of DSP digital signal processing capabilities, its receivers gradually begin to use high-frequency sequence pulse As a transmitting signal, complex functions are completed. Commonly used transmit signals are composed of point frequency bands, sweep frequency bands and retrace bands that are connected to each other. The sweep frequency band means that the frequency of the transmit signal changes with time. It is mainly used for target information acquisition, and the spot frequency band is used for target tracking. High precision frequency stab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/50G01S13/53G01S7/32
Inventor 黄善国李彬罗沛张杰顾畹仪
Owner BEIJING UNIV OF POSTS & TELECOMM
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