CN111693980A - 频率调变连续波雷达的侦测方法 - Google Patents
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Abstract
本发明关于一种频率调变连续波雷达的侦测方法,借由将频率调变连续波雷达的侦测信号分割为短时侦测信号并将短时侦测信号重组为子侦测信号,而可借由各该子侦测信号的该峰值因数判断物体与频率调变连续波雷达的距离。
Description
技术领域
本发明是关于一种频率调变连续波雷达,特别是关于一种频率调变连续波雷达的侦测方法。
背景技术
现有习知频率调变连续波雷达(Frequency modulated continuous wave radar,FMCW radar)的侦测方法是借由发射随着时间改变频率的信号至物体,并接收由物体反射的信号,由于频率调变连续波雷达发射的信号的频率是随着时间改变,该物体反射的信号的频率也是随着时间改变。因此,通过计算发射信号及反射信号于相同时间点的频率差,即可测得频率调变连续波雷达与物体之间的距离,由于频率调变连续波雷达具有体积小、短距离测量准确…等特性,被广泛地应用于距离及运动速度的测量。
发明内容
本发明的主要目的在于提供一种频率调变连续波雷达的侦测方法,以借由频率调变连续波雷达测得区域中仅有细微振动的物体。
一种频率调变连续波雷达的侦测方法,其包含频率调变连续波雷达(Frequencymodulated continuous wave radar,FMCW radar)发射频率调变发射信号至区域,且该频率调变连续波雷达接收该区域反射的反射信号为侦测信号,其中该区域具有物体。处理器由该频率调变连续波雷达接收该侦测信号,且该处理器将该侦测信号分割为多个短时侦测信号。该处理器对各该短时侦测信号进行频谱分析,并将各该短时侦测信号的相同频率的成份重组为多个子侦测信号,其中各该子侦测信号对应侦测距离。该处理器计算各该子侦测信号的峰值因数(Peak to average ratio,PAR),且该处理器根据所述峰值因数将其中的该子侦测信号对应的该侦测距离设定为该物体与该频率调变连续波雷达之间的距离。
前述的频率调变连续波雷达的侦测方法,其中各该子侦测信号对应的该侦测距离的计算方法为:
其中,R为各该子侦测信号对应的该侦测距离,c0为光速=3·108m/s,Δf为各该子侦测信号的频率,(df/dt)为该频率调变发射信号的频率变化的斜率。
前述的频率调变连续波雷达的侦测方法,其中该处理器是将具有最大该峰值因数的该子侦测信号对应的该侦测距离设定为该物体与频率调变连续波雷达之间的该距离。
前述的频率调变连续波雷达的侦测方法,其中该处理器对具有最大该峰值因数的该子侦测信号进行频谱分析而得到生理征象信号。
前述的频率调变连续波雷达的侦测方法,其另包含该处理器对所述子侦测信号进行频谱分析而得到多个生理征象信号。
前述的频率调变连续波雷达的侦测方法,其另包含该处理器设定频率范围,且该处理器将该生理征象信号位于该频率范围中具有最大振幅的频率设定为该物体的生理振动频率。
前述的频率调变连续波雷达的侦测方法,其中该处理器具有中央处理单元及储存单元,该储存单元电性连接该频率调变连续波雷达以接收该侦测信号,该储存单元用以储存该侦测信号,该中央处理单元电性连接该储存单元以接收该侦测信号,该中央处理单元用以对该侦测信号进行运算。
前述的频率调变连续波雷达的侦测方法,该频率调变连续波雷达具有FM信号产生器、功率分配器、发射天线、接收天线及混频器,该FM信号产生器用以输出频率调变信号,该功率分配器电性连接该该FM信号产生器,该功率分配器将该频率调变信号分为两路,该发射天线电性连接该功率分配器以接收其中一路的该频率调变信号,该发射天线将该频率调变信号发射为该频率调变发射信号,该接收天线接收该反射信号为接收信号,该混频器电性连接该功率分配器及该接收天线,以接收另一路的该频率调变信号及该接收信号,且该混频器将该频率调变信号及该接收信号进行混频而输出该侦测信号。
本发明借由该处理器对该频率调变连续波雷达测得的该侦测信号进行运算,得到可表示位于各个侦测距离上振动幅度的子侦测信号,而可透通过各该子侦测信号的该峰值因数判断该物体与该频率调变连续波雷达之间的该距离。
附图说明
图1:依据本发明的一实施例,频率调变连续波雷达的侦测方法的流程图。
图2:依据本发明的一实施例,频率调变连续波雷达及处理器的功能方块图。
图3:依据本发明的一实施例,该频率调变连续波雷达的电路图。
图4:依据本发明的一实施例,侦测信号分割为短时侦测信号后再重组为子侦测信号的示意图。
图5:依据本发明的一实施例,频率调变发射信号及反射信号的波形图。
【主要元件符号说明】
10:频率调变连续波雷达的侦测方法
11:频率调变连续波雷达测得侦测信号
12:将侦测信号分割为短时侦测信号
13:将短时侦测信号重组为子侦测信号
14:计算子侦测信号的峰值因数
110:频率调变连续波雷达 111:FM信号产生器
112:功率分配器 113:发射天线
114:接收天线 115:混频器
120:处理器 121:中央处理单元
122:储存单元 A:区域
O:物体 Sr:接收信号
ST:频率调变发射信号 SR:反射信号
Sd:侦测信号 SVS:生理征象信号
D:距离 VC:斜波电压
SFM:频率调变信号
具体实施方式
请参阅图1,其为本发明的一实施例,一种频率调变连续波雷达的侦测方法10的流程图,其包含「频率调变连续波雷达测得侦测信号11」、「将侦测信号分割为短时侦测信号12」、「将短时侦测信号重组为子侦测信号13」「计算子侦测信号的峰值因数14」。
请参阅图1及图2,在步骤11中以频率调变连续波雷达110(Frequency modulatedcontinuous wave radar,FMCW radar)发射频率调变发射信号ST至区域A,其中该区域A具有物体O,且该物体O有着细微的振动,例如该物体O的生理征象所造成的振动,或是有着固定振动频率的机械装置。该频率调变发射信号ST触碰到该区域A中的该物体O时,该物体O反射反射信号SR至该频率调变连续波雷达110,该频率调变连续波雷达110接收该反射信号SR为侦测信号Sd。请参阅图5,为该频率调变发射信号ST及该反射信号SR频率对时间变化的示意图,在本实施例中,由于该频率调变发射信号ST的频率变化是在侦测周期中随着时间线性上升,因此该反射信号SR的频率变化也是随时间线性上升。
请参阅图2,由于该物体O有着细微的振动,而与该频率调变连续波雷达110之间有着相对运动,该相对运动会对该频率调变发射信号ST产生都普勒效应(Doppler effect),使反射的该反射信号SR及该接收信号Sr包含有相对运动的都普勒成份。
请参阅图3,其为本实施例的该频率调变连续波雷达110的电路图,该频率调变连续波雷达110具有FM信号产生器111、功率分配器112、发射天线113、接收天线114及混频器115。该FM信号产生器111用以输出频率随时间变化的频率调变信号SFM,该功率分配器112电性连接该FM信号产生器111,且该功率分配器112将该频率调变信号SFM分为两路,在本实施例中,该功率分配器112为Wilkinson功率分配器,但本发明并不在此限。该发射天线113电性连接该功率分配器112以接收其中一路的该频率调变信号SFM,且该发射天线113将该频率调变信号SFM发射为该频率调变发射信号ST至该区域A,该接收天线114接收该物体O反射的该反射信号SR为接收信号Sr,该混频器115电性连接该功率分配器112及该接收天线114,以由该功率分配器112接收另一路的该频率调变信号SFM并由该接收天线114接收该接收信号Sr,且该混频器115将该频率调变信号SFM及该接收信号Sr进行混频而输出该侦测信号Sd,在本实施例中,该混频器115输出的该侦测信号Sd的频率是该频率调变信号SFM的频率减去该接收信号Sr的频率。
接着,请参阅图1及图2,在步骤12中,处理器120由该频率调变连续波雷达110接收该侦测信号Sd,并将该侦测信号Sd分割为多个短时侦测信号。在本实施例中,该处理器120具有中央处理单元121及储存单元122,该储存单元122电性连接该频率调变连续波雷达110以接收该侦测信号Sd并储存,该中央处理单元121电性连接该储存单元122以接收该侦测信号Sd,且该中央处理单元121将该侦测信号Sd分割为所述短时侦测信号。请参阅图4,最上方的信号为该侦测信号Sd,图中以虚线区隔开的各个信号则为各该短时侦测信号,在本实施例中,各该短时侦测信号的时间长度T1、T2、…、Tn皆相同,且各该短时侦测信号T1、T2、…、Tn的时间长度为频率调制信号中频率变化的周期。
接着,请参阅图1、图2及图4,在步骤13中,该处理器120的该中央处理单元121对各该短时侦测信号进行频谱分析,并将各该短时侦测信号的相同频率的成份重组为多个子侦测信号。请参阅图4,在本实施例中,该中央处理单元121是对各该短时侦测信号进行快速傅立叶转换(Fast Fourier Transform,FFT),以将各该短时侦测信号由时域转换至频域,接着,该中央处理单元121将所述短时侦测信号的相同频率成份重组为各该子侦测信号,因此,重组后的各该子侦测信号为所述短时侦测信号单一频率成份下的振幅变化,图中直列的A1,1、A1,2、…A1,N分别为第1个短时侦测信号的第1至N次频率的振幅大小,直列的An,1、An,2、…An,N分别为第n个短时侦测信号的第1至N次频率的振幅大小,各个横排即为依据第1至N次频率重新组成的各该子侦测信号,由于该侦测信号Sd中包含有相对运动的都普勒成份,因此,各该子侦测信号的振幅的变化即可表示相对运动的振幅大小。
此外,由于本实施例是使用该频率调变连续波雷达110进行相对运动的侦测,且该混频器115输出的该侦测信号Sd的频率为该频率调变信号SFM及该接收信号Sr的频率差值,因此,单一频率的各该子侦测信号皆可对应侦测距离,在本实施例中,各该子侦测信号的该侦测距离的计算方法为:
其中,R为各该子侦测信号对应的该侦测距离,c0为光速=3·108m/s,Δf为各该子侦测信号的频率,(df/dt)为该频率调变发射信号ST的频率变化的斜率。
请参阅图1及图2,在步骤14中,该处理器120的该中央处理单元121计算各该(每一横列)子侦测信号的峰值因数(Peak to average ratio,PAR),且该中央处理单元121根据所述峰值因数将其中的该子侦测信号对应的该侦测距离设定为该物体O与该频率调变连续波雷达110之间的距离D。其中,各该子侦测信号的该峰值因数越大,表示各该子侦测信号的振幅变化大,加上各该子侦测信号的振幅变化可表示相对运动的振动幅度,使得该子侦测信号的该峰值因数的大小与该侦测距离上的振动幅度成正比,因此,具有最大该峰值因数的该子侦测信号可代表该物体O位于该侦测距离上而造成较大的振动幅度,该处理器120的该中央处理单元121是将具有最大该峰值因数的该子侦测信号对应的该侦测距离设定为该物体O与该频率调变连续波雷达110之间的该距离D。
或者,在其他实施例中,若该区域A中有着不只一个物体,则该中央处理单元121根据门槛值及所述子侦测信号的该峰值因数判断各该物体O与该频率调变连续波雷达110之间的该距离D,由于该子侦测信号的该峰值因数的大小与该侦测距离上的振动幅度成正比,因此,在本实施例中,该中央处理单元121判断大于该门槛值的该峰值因数对应的该侦测距离为各该物体O的该距离D。
请参阅图1,较佳的,在步骤14中,该处理器120的该中央处理单元121可对具有最大该峰值因数的该子侦测信号进行频谱分析而得到该物体O的生理征象信号SVS,其中,该中央处理单元121对该子侦测信号进行快速傅立叶转换,以得知该相对运动的振动频率成份,进而分析该物体O的生理征象。或者,在该区域A中有着不只一个物体的实施例中,该处理器120对该峰值因数大于该门槛值的所述子侦测信号进行频谱分析而得到所述物体O的多个生理征象信号SVS。
其中,若已知该物体O为人类时,该处理器120的该中央处理单元121中设定有第一频率范围及第二频率范围,该第一频率范围为一般人类的呼吸频率,例如0.2Hz-0.35Hz之间,该第二频率范围为一般人类的心跳频率,例如1Hz-2.5Hz之间,接着,该处理器120将该生理征象信号SVS位于该第一频率范围中最大振幅的频率设定为该物体O的呼吸频率,并将该生理征象信号SVS位于该第二频率范围中具有最大振幅的频率设定为该物体O的心跳频率。在其他实施例中,若该物体O为其他生物或是有着固定振动频率的非生物时,可根据目标可能的振动频率设定该第一频率范围及该第二频率范围的频率大小,或是设定更多的频率范围,上述的该第一频率范围及该第二频率范围的频率设定及数量并非本案的所限。
本发明借由该处理器120对该频率调变连续波雷达110测得的该侦测信号Sd进行运算,得到可表示位于各个侦测距离上振动幅度的子侦测信号,而通过各该子侦测信号的该峰值因数判断该物体O与该频率调变连续波雷达110之间的该距离D。
本发明的保护范围当视申请专利范围所界定者为准,任何熟知此项技艺者,在不脱离本发明的精神和范围内所作的任何变化与修改,均属于本发明的保护范围。
Claims (8)
1.一种频率调变连续波雷达的侦测方法,其特征在于其包含:
频率调变连续波雷达(Frequency modulated continuous wave radar,FMCW radar)发射频率调变发射信号至区域,且该频率调变连续波雷达接收该区域反射的反射信号为侦测信号,其中该区域具有物体;
处理器由该频率调变连续波雷达接收该侦测信号,且该处理器将该侦测信号分割为多个短时侦测信号;
该处理器对各该短时侦测信号进行频谱分析,并将各该短时侦测信号的相同频率的成份重组为多个子侦测信号,其中各该子侦测信号对应侦测距离;以及
该处理器计算各该子侦测信号的峰值因数(Peak to average ratio,PAR),且该处理器根据所述峰值因数将其中的该子侦测信号对应的该侦测距离设定为该物体与该频率调变连续波雷达之间的距离。
3.根据权利要求1所述的频率调变连续波雷达的侦测方法,其特征在于:其中该处理器是将具有最大该峰值因数的该子侦测信号对应的该侦测距离设定为该物体与频率调变连续波雷达之间的该距离。
4.根据权利要求3所述的频率调变连续波雷达的侦测方法,其特征在于:其中该处理器对具有最大该峰值因数的该子侦测信号进行频谱分析而得到生理征象信号。
5.根据权利要求1所述的频率调变连续波雷达的侦测方法,其特征在于:其另包含该处理器对所述子侦测信号进行频谱分析而得到多个生理征象信号。
6.根据权利要求4或5所述的频率调变连续波雷达的侦测方法,其特征在于:其另包含该处理器设定频率范围,且该处理器将该生理征象信号位于该频率范围中具有最大振幅的频率设定为该物体的生理振动频率。
7.根据权利要求1所述的频率调变连续波雷达的侦测方法,其特征在于:其中该处理器具有中央处理单元及储存单元,该储存单元电性连接该频率调变连续波雷达以接收该侦测信号,该储存单元用以储存该侦测信号,该中央处理单元电性连接该储存单元以接收该侦测信号,该中央处理单元用以对该侦测信号进行运算。
8.根据权利要求1所述的频率调变连续波雷达的侦测方法,其特征在于:该频率调变连续波雷达具有FM信号产生器、功率分配器、发射天线、接收天线及混频器,该FM信号产生器用以输出频率调变信号,该功率分配器电性连接该该FM信号产生器,该功率分配器将该频率调变信号分为两路,该发射天线电性连接该功率分配器以接收其中一路的该频率调变信号,该发射天线将该频率调变信号发射为该频率调变发射信号,该接收天线接收该反射信号为接收信号,该混频器电性连接该功率分配器及该接收天线,以接收另一路的该频率调变信号及该接收信号,且该混频器将该频率调变信号及该接收信号进行混频而输出该侦测信号。
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