CN108983260A - A kind of GPS of low cost and the conducted signal quality verification device of Beidou - Google Patents
A kind of GPS of low cost and the conducted signal quality verification device of Beidou Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
- G01S19/235—Calibration of receiver components
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Abstract
本发明提供了一种低成本的GPS和北斗的传导信号质量验证装置，包括GNSS接收天线、可调增益GNSS信号放大器、GNSS信号一分多功分器、标准机、待测机和PC上位机，GNSS接收天线的输出端与可调增益GNSS信号放大器的输入端连接，可调增益GNSS信号放大器的输出端与GNSS信号一分多功分器的输入端连接，所述GNSS信号一分多功分器的输出端通过标准支路与所述标准机连接，所述标准机与所述PC上位机连接，所述GNSS信号一分多功分器的输出端通过测试支路与所述待测机连接，待测机与PC上位机连接。本发明的有益效果是：可以满足工厂产线批量测试接收机的定位性能的需要，有利于保证批量产品的品质，成本较低。
The invention provides a low-cost GPS and Beidou conduction signal quality verification device, including a GNSS receiving antenna, an adjustable gain GNSS signal amplifier, a GNSS signal multi-power divider, a standard machine, a machine to be tested and a PC host computer , the output end of the GNSS receiving antenna is connected with the input end of the adjustable gain GNSS signal amplifier, and the output end of the adjustable gain GNSS signal amplifier is connected with the input end of the GNSS signal one-point multiple power splitter, and the GNSS signal one-point multiple power divider is connected The output end of the divider is connected with the standard machine through the standard branch, the standard machine is connected with the PC host computer, and the output end of the GNSS signal multi-power splitter is connected with the test branch through the test branch. The computer is connected, and the machine under test is connected with the PC host computer. The beneficial effect of the present invention is that it can meet the needs of batch testing receiver positioning performance in factory production lines, is beneficial to ensure the quality of batch products, and has low cost.
Description
技术领域technical field
本发明涉及传导信号质量验证装置，尤其涉及一种低成本的GPS和北斗的传导信号质量验证装置。The invention relates to a device for verifying the quality of a conduction signal, in particular to a low-cost device for verifying the quality of a conduction signal for GPS and Beidou.
背景技术Background technique
GPS和北斗产业的发展和重要性与日俱增，随之而来的是对GPS和北斗接收机的测试要求越来越严格，从而准确评估产品的性能。The development and importance of the GPS and Beidou industry is increasing day by day, and with it, the testing requirements for GPS and Beidou receivers are becoming more and more stringent, so as to accurately evaluate the performance of the products.
GPS和北斗接收机在工厂进行SMT贴片后，需要对接收机的定位性能进行测试，找出存在生产缺陷的接收器，以确保接收机的批量品质，其中GPS和北斗接收机的传导信号质量是衡量接收机定位性能的一项重要指标。After the GPS and Beidou receivers are SMT-mounted in the factory, the positioning performance of the receivers needs to be tested to find receivers with production defects to ensure the batch quality of the receivers. Among them, the quality of the conducted signals of the GPS and Beidou receivers It is an important index to measure the positioning performance of the receiver.
目前的GPS和北斗传导信号需要在电磁屏蔽室中进行测试，使用矢量信号源模拟卫星发射信号，通过屏蔽性良好的射频线，发送给接收机，由此来判断GPS和北斗接收机的传导信号质量。该方案的优点是可靠性非常高，但是支持模拟卫星信号的矢量信号发生器价格较高，不适合产线大批量的采购测试用，而且无法实现多台接收机进行批量测试，不能满足工厂产线批量生产的需要。The current GPS and Beidou conduction signals need to be tested in an electromagnetic shielding room. Use a vector signal source to simulate satellite transmission signals, and send them to the receiver through a well-shielded radio frequency line, so as to judge the conduction signals of GPS and Beidou receivers. quality. The advantage of this solution is that the reliability is very high, but the price of the vector signal generator supporting the analog satellite signal is relatively high, it is not suitable for the mass purchase test of the production line, and it is impossible to realize the batch test of multiple receivers, which cannot meet the requirements of the factory production. line mass production needs.
对于工厂产线批量生产GPS和北斗接收机，需要一种低成本的GPS和北斗的传导信号质量验证装置，来批量测试接收机的定位性能，保证批量产品的品质。For the mass production of GPS and Beidou receivers in the factory production line, a low-cost GPS and Beidou conducted signal quality verification device is needed to test the positioning performance of the receivers in batches to ensure the quality of batch products.
发明内容Contents of the invention
为了解决现有技术中的问题，本发明提供了一种低成本的GPS和北斗的传导信号质量验证装置。In order to solve the problems in the prior art, the invention provides a low-cost GPS and Beidou conduction signal quality verification device.
本发明提供了一种低成本的GPS和北斗的传导信号质量验证装置，包括GNSS接收天线、可调增益GNSS信号放大器、GNSS信号一分多功分器、标准机、待测机和PC上位机，其中，所述GNSS接收天线的输出端与所述可调增益GNSS信号放大器的输入端连接，所述可调增益GNSS信号放大器的输出端与所述GNSS信号一分多功分器的输入端连接，所述GNSS信号一分多功分器的输出端通过标准支路与所述标准机连接，所述标准机与所述PC上位机连接，所述GNSS信号一分多功分器的输出端通过测试支路与所述待测机连接，所述待测机与所述PC上位机连接。The invention provides a low-cost GPS and Beidou conduction signal quality verification device, including a GNSS receiving antenna, an adjustable gain GNSS signal amplifier, a GNSS signal multi-power divider, a standard machine, a machine to be tested and a PC host computer , wherein, the output end of the GNSS receiving antenna is connected to the input end of the adjustable gain GNSS signal amplifier, and the output end of the adjustable gain GNSS signal amplifier is connected to the input end of the GNSS signal multiplier connected, the output end of the GNSS signal one-point multiple power splitter is connected to the standard machine through a standard branch, the standard machine is connected to the PC host computer, and the output of the GNSS signal one-point multiple power divider The terminal is connected to the machine under test through a test branch, and the machine to be tested is connected to the PC host computer.
作为本发明的进一步改进，所述GNSS接收天线的输出端通过带屏蔽射频线与所述可调增益GNSS信号放大器的输入端连接，所述可调增益GNSS信号放大器的输出端通过带屏蔽射频线与所述GNSS信号一分多功分器的输入端连接。As a further improvement of the present invention, the output end of the GNSS receiving antenna is connected to the input end of the adjustable gain GNSS signal amplifier through a shielded radio frequency line, and the output end of the adjustable gain GNSS signal amplifier is connected through a shielded radio frequency line It is connected with the input end of the GNSS signal multiplier.
作为本发明的进一步改进，所述标准支路包括标准支路的可调衰减器，所述标准支路的可调衰减器的输入端通过带屏蔽射频线与所述GNSS信号一分多功分器的输出端连接，所述标准支路的可调衰减器的输出端通过射频头与所述标准机的输入端连接。As a further improvement of the present invention, the standard branch includes an adjustable attenuator of the standard branch, and the input end of the adjustable attenuator of the standard branch is separated from the GNSS signal through a shielded radio frequency line. The output end of the adjustable attenuator of the standard branch is connected with the input end of the standard machine through the radio frequency head.
作为本发明的进一步改进，所述测试支路包括可调衰减器，所述测试支路的可调衰减器的输入端通过带屏蔽射频线与所述GNSS信号一分多功分器的输出端连接，所述测试支路的可调衰减器的输出端通过射频头与所述待测机的输入端连接。As a further improvement of the present invention, the test branch includes an adjustable attenuator, and the input end of the adjustable attenuator of the test branch is connected to the output end of the GNSS signal multiplier through a shielded radio frequency line. connected, the output end of the adjustable attenuator of the test branch is connected to the input end of the machine under test through the radio frequency head.
作为本发明的进一步改进，所述标准机、待测机分别通过串口与所述PC上位机连接。As a further improvement of the present invention, the standard machine and the machine to be tested are respectively connected to the PC host computer through serial ports.
作为本发明的进一步改进，所述GNSS信号一分多功分器为所述GNSS信号一分八功分器，所述标准支路有一支，所述测试支路有七支。As a further improvement of the present invention, the GNSS signal one-to-multiplexer is the GNSS signal one-to-eight power divider, and there is one in the standard branch and seven in the test branch.
本发明的有益效果是：通过上述方案，可以实现多台接收机进行批量测试，可以满足工厂产线批量测试接收机的定位性能的需要，有利于保证批量产品的品质，成本较低。The beneficial effects of the present invention are: through the above scheme, multiple receivers can be tested in batches, which can meet the needs of the positioning performance of batch testing receivers in the factory production line, which is beneficial to ensure the quality of batch products, and the cost is low.
附图说明Description of drawings
图1是本发明一种低成本的GPS和北斗的传导信号质量验证装置的示意图。Fig. 1 is a schematic diagram of a low-cost GPS and Beidou conducted signal quality verification device of the present invention.
具体实施方式Detailed ways
下面结合附图说明及具体实施方式对本发明作进一步说明。The present invention will be further described below in conjunction with the description of the drawings and specific embodiments.
如图1所示，一种低成本的GPS和北斗的传导信号质量验证装置，包括GNSS接收天线1、可调增益GNSS信号放大器2、GNSS信号一分多功分器、标准机5、待测机7和PC上位机8，GNSS信号一分多功分器可以优选为GNSS信号一分八功分器3，其中，所述GNSS接收天线1的输出端与所述可调增益GNSS信号放大器2的输入端连接，所述可调增益GNSS信号放大器2的输出端与所述GNSS信号一分八功分器3的输入端连接，所述GNSS信号一分八功分器3的输出端通过一支标准支路与所述标准机5连接，所述标准机5与所述PC上位机8连接，所述GNSS信号一分八功分器3的输出端通过七支测试支路与所述待测机7连接，所述待测机7与所述PC上位机8连接，GNSS为全球导航卫星系统。As shown in Figure 1, a low-cost GPS and Beidou conduction signal quality verification device includes a GNSS receiving antenna 1, an adjustable gain GNSS signal amplifier 2, a GNSS signal splitter, a standard machine 5, and a GNSS signal amplifier to be tested. Machine 7 and PC upper computer 8, the GNSS signal one-point multiple power splitter can preferably be the GNSS signal one-point eight power splitter 3, wherein, the output end of the GNSS receiving antenna 1 is connected with the adjustable gain GNSS signal amplifier 2 The input end of the adjustable gain GNSS signal amplifier 2 is connected to the input end of the GNSS signal one-to-eight power splitter 3, and the output end of the GNSS signal one-to-eight power splitter 3 passes through a A standard branch is connected with the standard machine 5, and the standard machine 5 is connected with the PC host computer 8, and the output end of the GNSS signal one-to-eight power divider 3 is connected with the waiting test branch through seven test branches. Measuring machine 7 is connected, and described machine to be tested 7 is connected with described PC upper computer 8, and GNSS is global navigation satellite system.
如图1所示，所述GNSS接收天线1的输出端通过带屏蔽射频线与所述可调增益GNSS信号放大器2的输入端连接，所述可调增益GNSS信号放大器2的输出端通过带屏蔽射频线与所述GNSS信号一分八功分器3的输入端连接。As shown in Figure 1, the output end of the GNSS receiving antenna 1 is connected to the input end of the adjustable gain GNSS signal amplifier 2 through a shielded radio frequency line, and the output end of the adjustable gain GNSS signal amplifier 2 is connected through a shielded radio frequency line. The radio frequency line is connected with the input end of the GNSS signal one-to-eight power divider 3 .
如图1所示，所述标准支路包括标准支路的可调衰减器4，所述标准支路的可调衰减器4的输入端通过带屏蔽射频线与所述GNSS信号一分八功分器3的输出端连接，所述标准支路的可调衰减器4的输出端通过射频头与所述标准机5的输入端连接，所述射频头优选为针对GPS和北斗接收机PCB板的专用射频头。As shown in Figure 1, the standard branch includes the adjustable attenuator 4 of the standard branch, and the input end of the adjustable attenuator 4 of the standard branch is divided into eight functions with the GNSS signal by a shielded radio frequency line The output end of divider 3 is connected, and the output end of the adjustable attenuator 4 of described standard branch is connected with the input end of described standard machine 5 by radio frequency head, and described radio frequency head is preferably for GPS and Beidou receiver PCB board dedicated radio head.
如图1所示，所述测试支路包括可调衰减器6，所述测试支路的可调衰减器6的输入端通过带屏蔽射频线与所述GNSS信号一分八功分器3的输出端连接，所述测试支路的可调衰减器6的输出端通过射频头与所述待测机7的输入端连接，所述射频头优选为针对GPS和北斗接收机PCB板的专用射频头。As shown in Figure 1, the test branch includes an adjustable attenuator 6, and the input end of the adjustable attenuator 6 of the test branch is connected to the GNSS signal one-to-eight power divider 3 through a shielded radio frequency line. The output terminal is connected, and the output terminal of the adjustable attenuator 6 of the test branch is connected with the input terminal of the machine under test 7 by a radio frequency head, and the radio frequency head is preferably a dedicated radio frequency for GPS and Beidou receiver PCB board head.
如图1所示，所述标准机5、待测机7分别通过串口与所述PC上位机8连接。As shown in FIG. 1 , the standard machine 5 and the machine to be tested 7 are respectively connected to the PC host machine 8 through serial ports.
如图1所示，所述的GNSS接收天线采用涵盖BDS、GPS、GLONASS、GALILIE的四个全球定位系统全频段天线，支持频段范围为 GPS 的L1/L2/L5；BDS的B1/B2/B3；GLONASS的 L1/L2 ；GALILEO 的E1/E2/E5a/E5b。天线采用多馈点设计，配备抗多径扼流板，使用防水、防紫外线外罩。所述的GNSS接收天线主要是安装在建筑物楼上面对天空的空旷区域，以保证GNSS接收天线可以接收到更多卫星的信号As shown in Figure 1, the GNSS receiving antenna adopts four global positioning system full-band antennas covering BDS, GPS, GLONASS, and GALILIE, and supports frequency bands L1/L2/L5 of GPS; B1/B2/B3 of BDS ; L1/L2 of GLONASS; E1/E2/E5a/E5b of GALILEO. The antenna adopts multi-feed point design, equipped with anti-multipath choke plate, and uses waterproof and UV-resistant outer cover. The GNSS receiving antenna is mainly installed in the open area facing the sky above the building to ensure that the GNSS receiving antenna can receive signals from more satellites
如图1所示，所述的可调增益GNSS信号放大器2通过屏蔽射频线和GNSS接收天线1连接。所述的可调增益GNSS信号放大器2支持频段范围为 GPS 的L1/L2/L5；BDS的B1/B2/B3；所述的可调增益GNSS信号放大器2的最大增益为54db。所述的可调增益GNSS信号放大器2的干扰抑制大于20dB（f0±100MHz），其反射损耗-14dB（即驻波比≤1.5）。所述的可调增益GNSS信号放大器2主要作用是放大GNSS接收天线接收到的卫星信号。所述的可调增益GNSS信号放大器2通过调整自身的放大增益，可以补偿在长距离射频线中传输损耗的卫星信号。As shown in FIG. 1 , the gain-adjustable GNSS signal amplifier 2 is connected to the GNSS receiving antenna 1 through a shielded radio frequency line. The adjustable gain GNSS signal amplifier 2 supports frequency ranges of L1/L2/L5 of GPS; B1/B2/B3 of BDS; the maximum gain of the adjustable gain GNSS signal amplifier 2 is 54db. The interference suppression of the gain-adjustable GNSS signal amplifier 2 is greater than 20dB (f0±100MHz), and its reflection loss is -14dB (ie standing wave ratio≤1.5). The main function of the adjustable gain GNSS signal amplifier 2 is to amplify satellite signals received by the GNSS receiving antenna. The gain-adjustable GNSS signal amplifier 2 can compensate the satellite signal lost in transmission in the long-distance radio frequency line by adjusting its own amplification gain.
如图1所示，所述的GNSS信号一分八功分器3通过屏蔽射频线和可调增益GNSS信号放大器2连接。所述的GNSS信号一分八功分器3是一款一输入，8个输出的GNSS信号设备。所述的GNSS信号一分八功分器3主要用于分配从可调增益GNSS信号放大器出来的卫星信号，使得GNSS信号一分八功分器的8个输出端口卫星信号能量相等。所述的GNSS信号一分八功分器所支持的卫星频段为：GPS:L1,L2,L2C,L5；Glonass:G1,G2；Galileo:L1,E1,E2,E5(E5a,E5b),E6；Beidou2:B1,B2,B3，其端口的隔离度大于 30dB。As shown in FIG. 1 , the GNSS signal one-to-eight power divider 3 is connected to the GNSS signal amplifier 2 with an adjustable gain through a shielded radio frequency line. The GNSS signal one-to-eight power divider 3 is a GNSS signal device with one input and eight outputs. The GNSS signal divider 3 is mainly used for distributing the satellite signals from the GNSS signal amplifier with adjustable gain, so that the satellite signal energies of the eight output ports of the GNSS signal divider are equal. The satellite frequency bands supported by the GNSS signal one-to-eight power divider are: GPS: L1, L2, L2C, L5; Glonass: G1, G2; Galileo: L1, E1, E2, E5 (E5a, E5b), E6 ; Beidou2: B1, B2, B3, the port isolation is greater than 30dB.
如图1所示，所述一个标准支路的可调衰减器4和七个测试支路的可调衰减器6分别通过屏蔽射频线和GNSS信号一分八功分器3的8个输出端口连接到一起。因为每一路的射频线会有差异。所述的一个标准支路的可调衰减器4和七个测试支路的可调衰减器6的作用是调整每一路的GNSS信号，使得到达每一个射频头的GNSS信号能量相等。As shown in Figure 1, the adjustable attenuator 4 of the standard branch and the adjustable attenuator 6 of the seven test branches pass through 8 output ports of the shielded radio frequency line and GNSS signal one-to-eight power splitter 3 respectively connected together. Because each radio frequency line will be different. The function of the adjustable attenuator 4 of one standard branch and the adjustable attenuator 6 of seven test branches is to adjust the GNSS signal of each path, so that the energy of the GNSS signal reaching each radio head is equal.
如图1所示，所述的8个射频头和一个标准支路的可调衰减器4、七个测试支路的可调衰减器6分别连接到一起，并固定在专用的夹具上。As shown in FIG. 1 , the eight radio heads, one standard branch adjustable attenuator 4 and seven test branch adjustable attenuators 6 are respectively connected together and fixed on a special fixture.
如图1所示，所述的射频头是结合GPS和北斗接收机PCB板专门设计的，屏蔽性良好，减少外界对GPS和北斗接收机传导信号质量的干扰，也避免对标准支路和测试支路产生串扰。As shown in Figure 1, the radio frequency head is specially designed in combination with the GPS and Beidou receiver PCB board, and has good shielding performance, which reduces external interference to the quality of the GPS and Beidou receiver's conducted signals, and also avoids interference with the standard branch and test Branches generate crosstalk.
如图1所示，所述的标准机5通过射频头和可调衰减器4连接，接收GNSS信号一分八功分器3其中一个端口输出的GNSS信号。所述的标准机5是经过GPS和北斗信号发生器测量过的，满足GPS和北斗的传导信号质量指标的GPS和北斗接收机。所述的标准机5在本系统的作用是作为GNSS信号质量的对比机，其他待测机7的传导信号质量指标由所述的标准机的信号质量作为标准进行评估。As shown in FIG. 1 , the standard machine 5 is connected with the adjustable attenuator 4 through the radio frequency head, and receives the GNSS signal output by one port of the GNSS signal one-to-eight power splitter 3 . The standard machine 5 is a GPS and Beidou receiver that meets the conducted signal quality indicators of GPS and Beidou after being measured by GPS and Beidou signal generators. The function of the standard machine 5 in this system is as a comparison machine of GNSS signal quality, and the conduction signal quality indicators of other machines to be tested 7 are evaluated by the signal quality of the standard machine as a standard.
如图1所示，所述的标准机5通过串口和所述的PC上位机8连接，所述标准机5会实时接收到的GNSS信号并生成GNSS信号质量值，同时将GNSS信号质量值通过串口传输到PC上位机8上以柱状图的形式显示出来，方便测试人员查看。As shown in Figure 1, described standard machine 5 is connected with described PC upper computer 8 by serial port, and the GNSS signal that described standard machine 5 can receive in real time generates GNSS signal quality value, and GNSS signal quality value is passed through simultaneously The serial port is transmitted to the PC host computer 8 and displayed in the form of a histogram, which is convenient for testers to view.
如图1所示，所述的七个待测机7分别通过射频头和可调衰减器6连接，分别接收GNSS信号一分八功分器3其中一个端口输出的GNSS信号。所述的待测机7是产线上生成出来的待测试的GPS和北斗接收机，简称接收机。As shown in FIG. 1 , the seven devices 7 to be tested are respectively connected through the radio frequency head and the adjustable attenuator 6 , and receive the GNSS signal output by one port of the GNSS signal one-to-eight power divider 3 . The device to be tested 7 is a GPS and Beidou receiver to be tested generated on the production line, referred to as a receiver for short.
如图1所示，所述的七个待测机7分别通过串口和所述的PC上位机8连接，所述待测机7会实时接收到的GNSS信号并生成GNSS信号质量值，同时将GNSS信号质量值通过串口传输到PC上位机8上以柱状图的形式显示出来。测试人员以标准机5的信号质量值为标准，来区分存在生产缺陷的接收器。As shown in Figure 1, described seven machines to be tested 7 are respectively connected with described PC upper computer 8 by serial port, and the GNSS signal that described machine to be tested 7 can receive in real time and generate GNSS signal quality value, simultaneously will The GNSS signal quality value is transmitted to the PC host computer 8 through the serial port and displayed in the form of a bar graph. The testers used the signal quality value of the standard machine 5 as a standard to distinguish receivers with production defects.
本发明提供的一种低成本的GPS和北斗的传导信号质量验证装置，具有以下优点：A low-cost GPS and Beidou conduction signal quality verification device provided by the present invention has the following advantages:
（1）可以实现多台接收机进行批量测试，可以满足工厂产线批量测试接收机的定位性能的需要，有利于保证批量产品的品质，成本较低，满足工厂产线批量测试接收机的定位性能的需要，及时发现存在生产缺陷的接收器。(1) Multiple receivers can be tested in batches, which can meet the needs of the positioning performance of batch test receivers in the factory production line, which is conducive to ensuring the quality of batch products, and the cost is low, which can meet the positioning of batch test receivers in the factory production line Performance needs to detect receivers with production defects in a timely manner.
（2）通过可调衰减器4、6来调整每一个GNSS信号输出端口的信号能量，使得每一个输出端口的信号能量相等，同时加强了屏蔽减少外界的环境干扰，来保证了每个接收机测试链路的一致性。(2) Adjust the signal energy of each GNSS signal output port through adjustable attenuators 4 and 6, so that the signal energy of each output port is equal, and at the same time strengthen the shielding to reduce external environmental interference to ensure that each receiver Test link consistency.
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本发明的保护范围。The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.
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Application publication date: 20181211 |