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THz radar transmitting/receiving front end

A radar, point frequency source technology, applied in the field of radar, can solve the problems that the signal is difficult to drive the transmitting link and the receiving link at the same time, there is no low noise amplifier, the loss of the mixing device is large, etc. The effect of simplifying the machine system and high achievability

Inactive Publication Date: 2012-10-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] Considering the status quo of terahertz frequency band devices, that is, terahertz frequency sources usually have low power, no low-noise amplifier and large loss of frequency mixing devices at the current technical level, and it is difficult for the signals generated by a single frequency source to drive the transmission chain at the same time However, THz chirp radar ranging and imaging both need to use phase information. If two or more frequency sources are used to drive separately, it will bring about the problem of phase asynchrony, resulting in a non-coherent system.

Method used

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  • THz radar transmitting/receiving front end
  • THz radar transmitting/receiving front end
  • THz radar transmitting/receiving front end

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Embodiment Construction

[0016] The specific implementation of the transceiver front-end structure of this THz radar will be described in detail below in conjunction with the accompanying drawings.

[0017] First, it is specifically explained that the non-coherent frequency source realizes the principle of coherent reception

[0018] Suppose the signals generated by frequency sources 1 and 2 are as follows:

[0019] the s 1 (t)=A 1 cos(ω 1 t+θ 1 ) (1)

[0020] the s 2 (t)=A 2 cos(ω 2 t+θ 2 )

[0021] In the formula, A 1 、A 2 are the amplitudes of frequency sources 1 and 2, respectively, ω 1 , ω 2 is the angular frequency corresponding to the frequency source, θ 1 , θ 2 is the initial phase corresponding to frequency source 1 and 2. After these two frequency sources are respectively multiplied by N, the signal form obtained is as follows:

[0022] the s 1 '(t)=A 1 'cos(Nω 1 t+Nθ 1 ) (2)

[0023] the s 2 '(t)=A 2 'cos(Nω 2 t+Nθ 2 )

[0024] the s 1 After '(t) interacts ...

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Abstract

The invention discloses a THz radar transmitting / receiving front end, which comprises a dot frequency source unit, an intermediate frequency local oscillator generating unit, a first upper mixing unit, a second upper mixing unit and a linear sweep frequency unit. According to the THz radar transmitting / receiving front end, a THz radar transmitting link and a THz radar receiving link are respectively driven by using two incoherent sources, and the problem that a single signal source under a THz frequency band is difficult to drive the transmitting link and the receiving link simultaneously is solved; and moreover, a coherent system is realized through an incoherent source, the problem that the receiving signals generated by two signal sources have asynchronous phases is solved, and a linear frequency modulation continuous wave (LFMCW) sweep frequency signal is rapidly provided; and therefore, centimeter-sized range resolution of an object can be realized.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a design of a transceiver front end of a THz radar. Background technique [0002] THz radar can detect smaller targets and more accurate positioning than microwave radar, and has higher resolution and stronger confidentiality. Since the wavelength of the THz frequency band is much smaller than that of existing microwaves, it is more suitable for the realization of extremely large signal bandwidth and extremely narrow antenna beam, which is conducive to obtaining fine imaging of targets; the Doppler effect caused by object movement is more significant, which is beneficial to low-speed moving targets Detection, high-resolution synthetic aperture and inverse synthetic aperture imaging; avoiding the traditional stealth material absorbing frequency band, which is conducive to the detection of stealth targets; in addition, the radar cross-sectional area of ​​metal targets is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/48
Inventor 皮亦鸣李晋高艳松曹宗杰闵锐范录宏徐政五
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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