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Velocity ambiguity resolving method suitable for linear frequency-modulation continuous wave radar system

A fuzzy method and linear frequency modulation technology, applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve the problems of large amount of calculation and high complexity of the system, and achieve reduced implementation complexity and simplicity Effective solution to the effect of velocity blur

Active Publication Date: 2017-06-13
SOUTHEAST UNIV
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Problems solved by technology

In this process, multiple estimates of speed, distance parameters and speed matching lead to a large amount of calculation and high complexity of the system

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  • Velocity ambiguity resolving method suitable for linear frequency-modulation continuous wave radar system
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  • Velocity ambiguity resolving method suitable for linear frequency-modulation continuous wave radar system

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Embodiment Construction

[0034] The technical solution of the present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0035] In this specific embodiment, the radar adopts an antenna array with three transmissions and four receptions, figure 1 It is a schematic diagram of the waveforms of different sawtooth waves, image 3 A time-frequency diagram of the signal transmitted by the antenna. Transmit 64 frequency sweep cycles as T 1 The sawtooth wave S saw1 signal, the three transmitting antennas transmit the sawtooth wave signal sequentially in a time-division manner; and then transmit 16 frequency sweep cycles as T 2 The sawtooth signal S saw2 , where only antenna 1 is used to transmit signals. The system parameters are shown in the table below:

[0036] Table 1 System parameter settings

[0037]

[0038] This specific embodiment discloses a speed ambiguity solution method suitable for a linear frequency modulation continuous...

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Abstract

The invention discloses a velocity ambiguity resolving method suitable for a linear frequency-modulation continuous wave radar system. The method comprises the steps of firstly obtaining first echo data and second echo data according to an originally received intermediate-frequency signal; secondly, estimating a target distance and an ambiguous velocity and then determining a discrete Fourier transform rotation factor according to the target distance and the ambiguous velocity; thirdly, carrying out fast Fourier transform of a fast time dimension by using a reference signal and obtaining a slow time dimension complex vector of a distance unit at which the target is located according to the distance unit, at which the target is located, obtained in the first step; and finally multiplying the slow time dimension complex vector by the discrete Fourier transform rotation factor to find out a real unambiguous velocity corresponding to the maximum value. By creatively utilizing the concept of the least common multiple, a simple and effective velocity ambiguity resolving scheme is provided; the hardware implementation complexity is reduced; and a supportable guarantee is provided for parameter estimation and further operation of the whole system.

Description

technical field [0001] The invention relates to the field of radar signal processing, in particular to a speed ambiguity resolution method suitable for a linear frequency modulation continuous wave radar system. Background technique [0002] The research on radar started in the mid-1930s, and has been greatly developed through the promotion of different historical factors. Linear frequency modulated continuous wave (LFMCW) radar is a radar system that obtains distance and speed information by frequency modulation of continuous wave. For a long time in the past, the application of LFMCW radar was limited to a small range. In the 1990s, the development of solid-state microwave and millimeter-wave devices and digital signal processing technology laid the foundation for the development of millimeter-wave LFMCW radar. Millimeter wave radar has extremely far-reaching application value in military and civilian applications, and its advantages can be summarized as follows: [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/58
CPCG01S7/418G01S13/589
Inventor 李杨徐春梅刘祺吕钱黄永明王海明
Owner SOUTHEAST UNIV
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