What is the signal-to-noise ratio of the BGT60TR13C

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lsy
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HI,I noticed that on the BGT60TR13C interface that the radar has a "The high signal-to-noise ratio (SNR) ensures that the radar can detect forward human targets at a range of 15 meters" .Can you tell me the specific value of high signal-to-noise ratio for radar.Thank you! Looking forward to your reply.
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Yaran_W
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250 replies posted 100 solutions authored 25 likes received

Hi lsy,

Maybe you are not very clear about the concept of radar signal-to-noise ratio, it is not like usually defined by 10lg(Ps/Pn), the maximum detection range of radar, also known as radar power. The maximum detection range of radar is usually calculated by the equation of FMCW as follows:

WangYaran_0-1687678798897.png

Tf is the total time of Chirp within a frame. If the frame duty cycle is 100%, Tf is equal to the frame period, otherwise Tf is generally smaller than the frame period. Pt is the transmit power, Gt is the transmit antenna gain, and Gr is the receive antenna gain. So you ask the specific value of SNR is 15 meters.

BR

Yaran

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Yaran_W
Moderator
Moderator
Moderator
250 replies posted 100 solutions authored 25 likes received

Hi lsy,

Maybe you are not very clear about the concept of radar signal-to-noise ratio, it is not like usually defined by 10lg(Ps/Pn), the maximum detection range of radar, also known as radar power. The maximum detection range of radar is usually calculated by the equation of FMCW as follows:

WangYaran_0-1687678798897.png

Tf is the total time of Chirp within a frame. If the frame duty cycle is 100%, Tf is equal to the frame period, otherwise Tf is generally smaller than the frame period. Pt is the transmit power, Gt is the transmit antenna gain, and Gr is the receive antenna gain. So you ask the specific value of SNR is 15 meters.

BR

Yaran

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那BGT60TR13C的snr就是15米吗?还是说15米只是雷达的探测距离,那这个snr具体的值是多少DB呢?

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Hi 郁闷的怪物:

建议你先看下雷达信噪比的定义,这里的信噪比是距离FFT的信噪比,它也称作雷达威力,就是指雷达所能探测到的最远距离,跟一般的信噪比计算不同,BGT60TR13C的snr就是15米,具体可以参考以下链接学习:

https://zhuanlan.zhihu.com/p/597193462

BR

Yaran

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郁闷的怪物
Level 2
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10 replies posted 10 sign-ins 5 replies posted

那你这个BGT60TR13C 60Gh的雷达确定可以检测亚毫米级别的运动吗?下面图片是官网上介绍的,说是高灵敏度,可以探测亚毫米级别运动。我现在就想问问是不是可以探测到亚毫米级别的运动?想向您确认一下,是或不是。谢谢!!

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郁闷的怪物
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那这个亚毫米具体指的是0.1mm吗?能否检测到心率?

 

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Hi 郁闷的怪物,

是的,radar无法直接检测到人体心率,只能检测到人体胸腔呼吸,再通过一系列算法换算出心率,一般在人体不剧烈运动情况下,可以简单利用1:4 的比例来估算出呼吸和心率比。这里有篇文章可以参考:

https://www.infineon.com/dgdl/Infineon-EETE_23_03_Infineon_CoverArticle-Article-v01_00-EN.pdf?fileId...

WangYaran_0-1688089173723.png

以上,希望可以帮到你。

BR

Yaran

 

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lsy
Level 1
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5 sign-ins First reply posted First question asked

你好,如你所说亚毫米级分辨率,心跳引起的胸腔起伏范围也为0.1mm至0.5mm,为什么不能直接检测到人体心率?谢谢

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Yaran_W
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250 replies posted 100 solutions authored 25 likes received

Hi lsy,

引起胸腔起伏的是呼吸而不是心率。胸腔起伏幅度是指呼吸时胸廓的活动 。当呼气时,由于胸腔容积减小,胸廓360度向内压缩,左右:桶柄向下,前后:泵柄向下,背部中上侧压缩,上下:在上下方向缩短、压缩。吸气360度扩张,呼气360度压缩 。所以无法直接检测心率。

BR

Yaran

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那心跳引起的心脏的跳动,这个雷达也是检测不到吗?

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那你这个算法具体是什么呢? 您发的这个pdf链接也没有关于具体算法的描述。

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Hi 郁闷的怪物,

文章已清楚表达,通过其Tx天线的低能量RF信号,并通过Rx天线(图2)。一般来说,移动目标会导致多普勒频移,通过比较传输的和接收到的信号。检测胸部的微小运动

通过LNA(low noise amplifier),phase shifter(移相器)提取出有效呼吸和心率信号。

请仔细阅读。

WangYaran_0-1688285237347.png

以上,

BR

Yaran

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我说的是呼吸率转换为心率的算法是什么,你不是说心率直接检测不到吗?

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我看你们官网上面对这款雷达进行了描述,上面说可以检测到心跳,但是没有说是用算法进行换算的,其实还是检测不到呗?图片如下,文章链接:Infineon-Presence_detection_enabled_by_XENSIV_radar_sensors-ProductBrief-v01_00-EN.pdf

_0-1688437536626.png

 

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郁闷的怪物
Level 2
Level 2
10 replies posted 10 sign-ins 5 replies posted

那你这个亚毫米具体指的是什么呢?是0.1mm吗?

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Hi 郁闷的怪物,

是的。

WangYaran_1-1688285715543.png

BR

Yaran

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那这个图片的60Ghz对应的5mm是什么呀?

 

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Hi 郁闷的怪物,

是波长,电磁波的速度可以用光速来计算,c=3x108,入=c/f=3x108/60x109=5mm。

BR

Yaran

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