Triangular wave linear frequency-modulated continuous wave radar-based high-speed target speed measuring and ranging method

A linear frequency modulation, high-speed target technology, applied in radio wave measurement systems, radio wave reflection/reradiation, measurement devices, etc., can solve the problem of low speed and distance measurement accuracy

Active Publication Date: 2018-05-15
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The existing technology does not take this frequency difference into account, resulting in low speed and ranging accuracy

Method used

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  • Triangular wave linear frequency-modulated continuous wave radar-based high-speed target speed measuring and ranging method
  • Triangular wave linear frequency-modulated continuous wave radar-based high-speed target speed measuring and ranging method
  • Triangular wave linear frequency-modulated continuous wave radar-based high-speed target speed measuring and ranging method

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Embodiment

[0040] Triangular wave linear frequency modulation continuous wave signal, that is, the transmission frequency changes according to the law of periodic triangular waves. Such as figure 1 As shown, let f t is the high-frequency transmission frequency of the transmitter, f r is the echo frequency reflected from the target. It has the same change law as the emission frequency, but with a time lag of t r , t r = 2R / c. The maximum frequency deviation of the transmitting frequency is F m =2Δf,f b is the beat frequency between the transmitted and received signals, and the average value of the beat frequency is f bav express.

[0041] Transmission frequency f t and echo frequency f r Can be written as the following expression:

[0042]

[0043]

[0044] difference frequency f b for

[0045]

[0046] In the rising section of frequency modulation, df / dt is positive, and in the falling section, df / dt is negative, but the difference frequency between the two is still...

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Abstract

The invention discloses a triangular wave linear frequency-modulated continuous wave radar-based high-speed target speed measuring and ranging method. The method comprises the following steps of collecting target echo data measured by a triangular wave linear frequency-modulated continuous wave radar, performing FFT (fast Fourier transform) treatment to obtain an up-and-down frequency sweeping result, substituting a frequency difference generated by the distance walking into a calculation formula of the distance and the speed to obtain a corrected distance and speed equation, and further solving to obtain a distance and speed result. According to the invention, the speed measuring and ranging formula of the triangular wave linear frequency-modulated continuous wave radar is corrected, so that a more accurate result can be obtained during the detection of a high-speed moving target.

Description

technical field [0001] The invention relates to a speed measurement and distance measurement method, in particular to a speed measurement and distance measurement method for a high-speed target based on a triangular wave linear frequency modulation continuous wave radar. Background technique [0002] Linear frequency modulated continuous wave (LFMCW) radar is a radar system that obtains distance and speed information by frequency modulation of continuous waves. to receive widespread attention. Its theory and key technologies have developed rapidly, and its application fields have become more and more extensive. Continuous wave radar is mainly used for Doppler navigation, speed measurement, height measurement, proximity fuze, missile guidance, target search, tracking and identification, target indication, battlefield surveillance, and physical research of stealth aircraft. Among them, triangular wave linear frequency modulation continuous wave radar is more common. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/58
CPCG01S13/584
Inventor 缪晨赵阳莹吴文张培钟何仲阳
Owner NANJING UNIV OF SCI & TECH
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