CN112606879A - Vehicle positioning system and method for railway traffic - Google Patents
Vehicle positioning system and method for railway traffic Download PDFInfo
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- CN112606879A CN112606879A CN202011594095.6A CN202011594095A CN112606879A CN 112606879 A CN112606879 A CN 112606879A CN 202011594095 A CN202011594095 A CN 202011594095A CN 112606879 A CN112606879 A CN 112606879A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L25/00—Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
- B61L25/02—Indicating or recording positions or identities of vehicles or trains
- B61L25/025—Absolute localisation, e.g. providing geodetic coordinates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L15/00—Indicators provided on the vehicle or train for signalling purposes
- B61L15/0072—On-board train data handling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
- B61L27/40—Handling position reports or trackside vehicle data
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Abstract
The invention discloses a vehicle positioning system for railway traffic, which comprises: the input end of the antenna module is connected with the output end of the beacon module; the first input end of the signal channel circuit is connected with the output end of the antenna module; the input end of the AD sampling circuit is connected with the output end of the signal channel circuit; the first input end of the FPGA is connected with the output end of the AD sampling circuit, peak searching calculation is carried out, and peak value time is obtained; and the input end of the CPU is connected with the first output end of the FPGA, and the CPU identifies and positions the vehicle according to the peak time to obtain the beacon position of the vehicle and complete vehicle positioning. The invention solves the problems of complex installation and low positioning precision of the traditional positioning technology of railway traffic, reads the FSK signal of the beacon along the track through the antenna equipment carried by the vehicle to position the central point of the beacon, obtains the position information of the vehicle through calculation, completes the positioning of the vehicle, improves the positioning precision, and has more convenient installation, development and maintenance and low manufacturing cost.
Description
Technical Field
The invention relates to the technical field of railway traffic communication, in particular to a vehicle positioning system and a vehicle positioning method for railway traffic.
Background
Under the large background that railway traffic is increasingly developed, the running speed is increasingly fast, and the passenger carrying capacity is increasingly increased, the monitoring of the running state of the vehicle is increasingly important, and the position of the vehicle needs to be positioned at any time, so that the vehicle can be effectively controlled and scheduled, and therefore a beacon positioning implementation scheme is developed.
At present, the positioning technology mainly applied to railway traffic needs to use equipment such as a satellite navigation system, a satellite signal amplifier, a signal receiving system and the like, and has high cost and complex installation and application.
Meanwhile, in areas with complex terrains, a satellite navigation system basically fails, the positioning mode of the satellite navigation system is basically position estimation by using a running distance, the positioning accuracy of the mode is not high, and software implementation is complex.
Disclosure of Invention
The invention aims to provide a vehicle positioning system for railway traffic and a method thereof. The system and the method aim to solve the problems of complex installation and low positioning accuracy of the traditional positioning technology of railway traffic, and the FSK signals of the beacons along the track are read through the antenna equipment carried by the vehicle so as to position the center point of the beacon, and the position information of the vehicle is obtained through calculation so as to complete vehicle positioning, so that the positioning accuracy is improved, and the system and the method are more convenient to install, develop and maintain and low in manufacturing cost.
To achieve the above object, the present invention provides a vehicle positioning system for railway traffic, comprising: the system comprises a beacon module, an antenna module, a signal channel circuit, an AD sampling circuit, an FPGA and a CPU; the beacon module receives message information of the vehicle; the input end of the antenna module is connected with the output end of the beacon module, message information is collected, and FSK signals of the vehicle are obtained; the first input end of the signal channel circuit is connected with the output end of the antenna module, and the FSK signal is subjected to signal processing to obtain a processed FSK signal; the input end of the AD sampling circuit is connected with the output end of the signal channel circuit, and the AD sampling circuit is used for performing AD conversion on the processed FSK signal to obtain a digital signal; the first input end of the FPGA is connected with the output end of the AD sampling circuit, and the peak searching calculation is carried out on the digital signal to obtain the peak time; the input end of the CPU is connected with the first output end of the FPGA, and the vehicle is identified and positioned according to the peak time to obtain the beacon position of the vehicle, so that the vehicle positioning is completed.
Most preferably, the vehicle locating system further comprises a self-test module; the input end of the self-checking module is connected with the second output end of the FPGA, the output end of the self-checking module is connected with the second input end of the signal channel circuit, and the output end of the CPU is connected with the second input end of the FPGA, so that the CPU, the FPGA, the self-checking module, the signal channel circuit, the AD sampling circuit, the FPGA and the CPU form a self-checking loop to perform self-checking on the vehicle positioning system.
Most preferably, the signal path circuitry comprises:
the input end of the attenuation network is connected with the output end of the antenna module, and the attenuation network controls the amplitude of the FSK signal and generates an FSK signal with the amplitude controlled;
the first input end of the electronic switch is connected with the output end of the attenuation network, the second input end of the electronic switch is connected with the output end of the self-checking module, and a vehicle positioning circuit or a system self-checking circuit is selected according to an FSK signal controlled by amplitude or a detection analog signal sent by the self-checking module;
and the input end of the low-pass filter is connected with the output end of the electronic switch, and the low-pass filter is used for reducing noise of the FSK signal or the detection analog signal controlled by the amplitude to obtain a processed FSK signal or a processed detection analog signal.
Most preferably, the FPGA comprises:
the first input end of the reading module is connected with the output end of the AD sampling circuit, and the reading module is used for reading and changing the digital signal to obtain a beacon energy value;
the input end of the threshold comparison module is connected with the output end of the reading module, and the beacon energy value is compared with a threshold value arranged in the beacon energy value; when the beacon energy value is larger than the threshold value, the beacon energy value is transmitted to a peak searching module; when the beacon energy value is not greater than the threshold value, stopping calculation;
and the input end of the peak searching module is connected with the output end of the threshold comparison module, and the peak searching module is used for performing peak searching calculation on the beacon energy value larger than the threshold value to obtain peak time.
Most preferably, the antenna module is an antenna device carried by the vehicle itself.
The invention also provides a vehicle positioning method for railway traffic, which is realized based on the vehicle positioning system for railway traffic and comprises the following steps:
step 1: the beacon module receives message information of the vehicle;
step 2: the antenna module collects message information and converts the message information into an FSK signal of the vehicle;
and step 3: transmitting the FSK signal to a signal channel circuit for signal processing to obtain a processed FSK signal;
and 4, step 4: transmitting the processed FSK signal to an AD sampling circuit for AD conversion to obtain a digital signal;
and 5: transmitting the digital signal to an FPGA for peak searching calculation to obtain peak time;
step 6: and transmitting the peak time to a CPU (central processing unit), and identifying and positioning the vehicle by the CPU according to the peak time to obtain the beacon position of the vehicle and finish the beacon positioning of the vehicle.
Most preferably, the signal processing further comprises the steps of:
step 3.1: transmitting the FSK signal to an attenuation network, performing amplitude control, and generating an FSK signal with the amplitude controlled;
step 3.2: transmitting the amplitude-controlled FSK signal to an electronic switch, and selecting a vehicle positioning circuit according to the amplitude-controlled FSK signal;
step 3.3: and transmitting the FSK signal with the controlled amplitude to a low-pass filter for noise reduction to obtain a processed FSK signal.
Most preferably, the peak finding calculation further comprises the steps of:
step 5.1: transmitting the digital signal to a reading module for reading and changing to obtain a beacon energy value;
step 5.2: transmitting the beacon energy value to a threshold comparison module, and comparing the beacon energy value with a threshold value arranged in the threshold comparison module;
step 5.3: when the beacon energy value is not greater than the threshold value, stopping calculation; and when the beacon energy value is larger than the threshold value, transmitting the beacon energy value to a peak searching module, and performing peak searching calculation on the beacon energy value larger than the threshold value to obtain peak time.
Most preferably, the vehicle positioning method further comprises the step of carrying out system self-inspection on the vehicle positioning system through a self-inspection loop formed by the CPU, the FPGA, the self-inspection module, the signal channel circuit, the AD sampling circuit, the FPGA and the CPU.
Most preferably, the system self-test further comprises the steps of:
the CPU sends out a self-checking signal; the FPGA generates a detection digital signal according to the self-detection signal; the self-checking module carries out digital processing on the detection digital signal to obtain a detection analog signal; an electronic switch in the signal channel circuit selects a system self-checking circuit according to the detection analog signal, and performs signal processing on the detection analog signal to obtain a processed detection analog signal; the AD sampling circuit carries out AD conversion on the processed detection analog signal to obtain a self-checking digital signal; the FPGA carries out peak searching processing on the self-checking digital signal to obtain a self-checking energy value; and the CPU compares the self-checking energy value with an internal energy threshold value and judges that the vehicle positioning system completes the system self-checking of the vehicle positioning system.
The invention solves the problems of complex installation and low positioning precision of the traditional positioning technology of railway traffic, reads the FSK signal of the beacon along the track through the antenna equipment carried by the vehicle to position the central point of the beacon, obtains the position information of the vehicle through calculation, completes the positioning of the vehicle, improves the positioning precision, and has more convenient installation, development and maintenance and low manufacturing cost.
Compared with the prior art, the invention has the following beneficial effects:
1. the vehicle positioning system for railway traffic provided by the invention has the advantages that the time interval for reading beacon data is small, the current positioning precision is plus or minus 50 centimeters, and the positioning precision of the vehicle positioning system is improved.
2. The vehicle positioning system for railway traffic provided by the invention uses the antenna module which is the equipment already equipped by the current vehicle, has few newly added equipment, reduces the manufacturing cost and has low manufacturing cost.
3. According to the vehicle positioning system for railway traffic, the signal channel circuit, the FPGA and the CPU are installed in the control board card, the positioning function can be realized only by updating the control board card and corresponding software, equipment and software which need to be maintained and updated are few, and the vehicle positioning system is convenient to install, develop and maintain.
Drawings
Fig. 1 is a schematic structural diagram of a vehicle positioning system provided by the present invention.
Detailed Description
The invention will be further described by the following specific examples in conjunction with the drawings, which are provided for illustration only and are not intended to limit the scope of the invention.
The present invention provides a vehicle locating system for railway traffic, as shown in fig. 1, comprising: the device comprises a beacon module 1, an antenna module 2, a signal channel circuit 3, an analog-digital (AD) sampling circuit 4, an FPGA5 and a CPU 6.
The beacon module 1 receives message information of a vehicle in the process that the vehicle travels along a traveling track; the antenna module 2 is arranged on the vehicle, and the input end of the antenna module 2 is connected with the output end of the beacon module 1, collects the message information of the beacon module 1, and converts the message information into a digital Frequency modulation (FSK) signal of the vehicle.
In this embodiment, the message information of the vehicle is a signal energy, and the closer to the center position of the vehicle, the stronger the signal energy received by the beacon module 1 is, the larger the amplitude of the FSK signal correspondingly generated by the antenna module 2 is.
A first input end of the signal channel circuit 3 is connected with an output end of the antenna module 2, and performs signal processing on the FSK signal to obtain a processed FSK signal; the input end of the AD sampling circuit 4 is connected with the output end of the signal channel circuit 3, and the processed FSK signal is subjected to AD conversion to obtain a digital signal; the FSK signal after processing is an analog signal, and needs to be AD-converted by the AD sampling circuit 4 into a digital signal.
The heights of the beacon module 1 and the antenna module 2 are different, the difference between the amplitudes of the FSK signals generated by the antenna module 2 is large, in the embodiment, the AD sampling circuit 4 selects an ADC with a model with large input signal amplitude to obtain FSK signals with large amplitude difference, and the influence of other interference signals on the FSK signals with small amplitude difference is reduced; in the present embodiment, the digital signal is a digital signal with 12 bits of digital quantity.
The first input end of the FPGA5 is connected with the output end of the AD sampling circuit 4, and the peak searching calculation is carried out on the digital signal to obtain the peak time.
Wherein, FPGA5 includes: a reading module 501, a threshold comparing module 502 and a peak searching module 503; a first input end of the reading module 501 is connected with an output end of the AD sampling circuit 4, and reads and changes the digital signal to obtain a beacon energy value; the input end of the threshold comparison module 502 is connected with the output end of the reading module 501, and the beacon energy value is compared with the threshold value set in the beacon energy value; when the beacon energy value is greater than the threshold value, the beacon energy value is transmitted to the peak searching module 503; when the beacon energy value is not greater than the threshold value, stopping calculation; the input end of the peak searching module 503 is connected to the output end of the threshold comparing module 502, and performs peak searching calculation on the beacon energy value greater than the threshold value, and the time when the obtained beacon energy value is the highest is the time when the vehicle passes through the beacon position, i.e. the peak time.
In the present embodiment, the reading module 501 receives the digital signal of 12 bits in digital quantity from the AD sampling circuit 4 at fixed intervals, and converts the digital signal of binary number into a beacon energy value of decimal number.
The input end of the CPU6 is connected to the first output end of the peak finding module 503 in the FPGA5, and identifies and locates the vehicle according to the peak time to obtain the beacon position of the vehicle, thereby completing the beacon location of the vehicle.
The vehicle positioning system further comprises a self-test module 7; the input end of the self-checking module 7 is connected with the second output end of the middle peak searching module 503 of the FPGA5, and the output end of the self-checking module 7 is connected with the second input end of the signal channel circuit 3; and the output end of the CPU6 is connected with the second input end of the reading module 501 in the FPGA5, so that the CPU6, the FPGA5, the self-checking module 7, the signal channel circuit 3, the AD sampling circuit 4, the FPGA5, and the CPU6 form a self-checking loop.
Wherein, CPU6 in the self-checking loop sends out a self-checking signal; the FPGA5 generates a detection digital signal according to a self-detection signal sent by the CPU 6; the self-checking module 7 performs digital processing on the detection digital signal to obtain a detection analog signal; the signal channel circuit 3 performs signal processing on the detection analog signal to obtain a processed detection analog signal; the AD sampling circuit 4 performs AD conversion on the processed detection analog signal to obtain a self-detection digital signal; the FPGA5 carries out peak searching processing on the self-checking digital signal to obtain a self-checking energy value; and the CPU6 compares the self-checking energy value with a built-in energy threshold value to complete the system self-checking of the vehicle positioning system.
In this embodiment, the self-test module 7 is a DA converter, and converts a detection digital signal with a fixed frequency to obtain a detection analog signal.
Wherein, the signal channel circuit 3 includes: an attenuation network 301, an electronic switch 302 and a low-pass filter 303; the input end of the attenuation network 301 is connected with the output end of the antenna module 2, and is used for performing amplitude control on the FSK signal and generating an amplitude-controlled FSK signal so as to ensure that the amplitude-controlled FSK signal does not generate redundant saturated signals in the subsequent AD sampling circuit 4; a first input end of the electronic switch 302 is connected with an output end of the attenuation network 301, a second input end of the electronic switch is connected with an output end of the self-checking module 7, and a vehicle positioning circuit or a system self-checking circuit is selected according to an FSK signal controlled by amplitude or a detection analog signal of the self-checking module 7; the input end of the low-pass filter 303 is connected to the output end of the electronic switch 302, and the output end is connected to the input end of the AD sampling circuit 4, so as to perform noise reduction on the FSK signal or the detection analog signal with controlled amplitude, so as to filter clutter with a signal frequency spectrum higher than 4MHz, and obtain a processed FSK signal or a processed detection analog signal.
The invention also provides a vehicle positioning method for railway traffic, which is realized based on the vehicle positioning system for railway traffic and comprises the following steps:
step 1: the beacon module 1 receives message information of a vehicle in the process that the vehicle travels along a traveling track;
step 2: the antenna module 2 collects message information of the vehicle and converts the message information into an FSK signal of the vehicle;
and step 3: transmitting the FSK signal to a signal channel circuit 3 for signal processing to obtain a processed FSK signal; wherein, the signal processing further comprises the following steps:
step 3.1: transmitting the FSK signal to the attenuator network 301 for amplitude control, and generating an amplitude-controlled FSK signal to ensure that the amplitude-controlled FSK signal does not generate redundant saturated signals in the subsequent AD sampling circuit 4;
step 3.2: transmitting the amplitude controlled FSK signal to the electronic switch 302 and selecting a vehicle locating circuit according to the amplitude controlled FSK signal;
step 3.3: the FSK signal with the controlled amplitude is transmitted to a low pass filter 303 for noise reduction to filter clutter with a signal spectrum higher than 4MHz to obtain a processed FSK signal.
And 4, step 4: transmitting the processed FSK signal to an AD sampling circuit 4 for AD conversion to obtain a digital signal; the processed FSK signal is an analog signal, and needs to be AD-converted by the AD sampling circuit 4 into a digital signal;
and 5: transmitting the digital signal to the FPGA5 for peak searching calculation to obtain peak time; wherein, the peak searching calculation also comprises the following steps:
step 5.1: transmitting the digital signal to the reading module 501 for reading and changing to obtain a beacon energy value; in this embodiment, the reading module 501 receives the digital signal with 12 bits as the digital quantity of the AD sampling circuit 4 at fixed intervals, and converts the digital signal with binary number into a beacon energy value of decimal number;
step 5.2: transmitting the beacon energy value to the threshold comparison module 502, and comparing the beacon energy value with a threshold value arranged in the threshold comparison module 502;
step 5.3: when the beacon energy value is not greater than the threshold value, stopping calculation; when the beacon energy value is greater than the threshold value, the beacon energy value is transmitted to the peak searching module 503, peak searching calculation is performed on the beacon energy value greater than the threshold value, and the time when the beacon energy value is the highest is the time when the vehicle passes through the beacon position, which is the peak time.
Step 6: the peak time is transmitted to the CPU6, and the CPU6 identifies and locates the vehicle according to the peak time, obtains the beacon position of the vehicle, and completes the beacon location of the vehicle.
The vehicle positioning method also comprises the step of carrying out system self-checking on the vehicle positioning system through a self-checking loop consisting of a CPU6, an FPGA5, a self-checking module 7, a signal channel circuit 3, an AD sampling circuit 4, the FPGA5 and the CPU 6; the method specifically comprises the following steps: the CPU6 in the self-checking loop sends out a self-checking signal; the FPGA5 generates a detection digital signal according to a self-detection signal sent by the CPU 6; the self-checking module 7 performs digital processing on the detection digital signal to obtain a detection analog signal; an electronic switch 302 in the signal channel circuit 3 receives the detection analog signal, selects a system self-test circuit, and performs signal processing on the detection analog signal through a low-pass filter 303 to obtain a processed detection analog signal; the AD sampling circuit 4 performs AD conversion on the processed detection analog signal to obtain a self-detection digital signal; the FPGA5 carries out peak searching processing on the self-checking digital signal to obtain a self-checking energy value; and the CPU6 compares the self-checking energy value with a built-in energy threshold value to complete the system self-checking of the vehicle positioning system.
The working principle of the invention is as follows:
the antenna module receives message information of the vehicle in the process that the vehicle travels along the traveling track; transmitting the message information of the vehicle to a beacon module, and converting the message information into an FSK signal of the vehicle; transmitting the FSK signal to a signal channel circuit for signal processing to obtain a processed FSK signal; transmitting the processed FSK signal to an AD sampling circuit for AD conversion to obtain a digital signal; transmitting the digital signal to an FPGA for peak searching calculation to obtain peak time; and transmitting the peak time to a CPU (central processing unit), and identifying and positioning the vehicle by the CPU according to the peak time to obtain the beacon position of the vehicle and finish the beacon positioning of the vehicle.
In conclusion, the vehicle positioning system and the method for railway traffic solve the problems of complex installation and low positioning accuracy of the conventional positioning technology of railway traffic, read the FSK signal of the beacon along the track through the antenna equipment carried by the vehicle to position the central point of the beacon, obtain the position information of the vehicle through calculation, complete vehicle positioning, improve positioning accuracy, and have more convenient installation, development and maintenance and low manufacturing cost.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A vehicle positioning system for railroad traffic, comprising:
the beacon module receives message information of the vehicle;
the input end of the antenna module is connected with the output end of the beacon module, and the antenna module is used for acquiring the message information and acquiring an FSK signal of a vehicle;
a first input end of the signal channel circuit is connected with an output end of the antenna module, and the signal channel circuit is used for processing the FSK signal to obtain a processed FSK signal;
the input end of the AD sampling circuit is connected with the output end of the signal channel circuit, and the AD sampling circuit is used for performing AD conversion on the processed FSK signal to obtain a digital signal;
the first input end of the FPGA is connected with the output end of the AD sampling circuit, and the FPGA carries out peak searching calculation on the digital signal to obtain peak time;
and the input end of the CPU is connected with the first output end of the FPGA, and the CPU identifies and positions the vehicle according to the peak time to obtain the beacon position of the vehicle and complete vehicle positioning.
2. The vehicle locating system for railroad traffic of claim 1, further comprising a self-test module; the input end of the self-checking module is connected with the second output end of the FPGA, the output end of the self-checking module is connected with the second input end of the signal channel circuit, and the output end of the CPU is connected with the second input end of the FPGA, so that the CPU, the FPGA, the self-checking module, the signal channel circuit, the AD sampling circuit, the FPGA and the CPU form a self-checking loop to perform self-checking on the vehicle positioning system.
3. The vehicle localization system for railroad traffic of claim 2, wherein the signal path circuit comprises:
the input end of the attenuation network is connected with the output end of the antenna module, the attenuation network controls the amplitude of the FSK signal and generates an FSK signal with the controlled amplitude;
the first input end of the electronic switch is connected with the output end of the attenuation network, the second input end of the electronic switch is connected with the output end of the self-checking module, and a vehicle positioning circuit or a system self-checking circuit is selected according to an FSK signal controlled by amplitude or a detection analog signal generated by the self-checking module;
and the input end of the low-pass filter is connected with the output end of the electronic switch, and the low-pass filter is used for reducing noise of the FSK signal or the detection analog signal controlled by the amplitude to obtain a processed FSK signal or a processed detection analog signal.
4. The vehicle localization system for railroad traffic of claim 1, wherein the FPGA comprises:
a first input end of the reading module is connected with an output end of the AD sampling circuit, and the reading module is used for reading and changing the digital signal to obtain a beacon energy value;
the input end of the threshold comparison module is connected with the output end of the reading module, and the beacon energy value is compared with a threshold value arranged in the beacon energy value; when the beacon energy value is larger than the threshold value, transmitting the beacon energy value to a peak searching module; when the beacon energy value is not larger than the threshold value, stopping calculation;
and the input end of the peak searching module is connected with the output end of the threshold comparing module, and the peak searching module is used for performing peak searching calculation on the beacon energy value which is greater than the threshold value to obtain the peak time.
5. The vehicle localization system for railroad traffic of claim 1, wherein the antenna module is an antenna device carried by the vehicle itself.
6. A vehicle positioning method for railway traffic, characterized in that the vehicle positioning method is implemented based on the vehicle positioning system for railway traffic of any one of claims 1 to 5, the vehicle positioning method comprising the steps of:
step 1: the beacon module receives message information of the vehicle;
step 2: the antenna module collects the message information and converts the message information into an FSK signal of the vehicle;
and step 3: transmitting the FSK signal to a signal channel circuit for signal processing to obtain a processed FSK signal;
and 4, step 4: transmitting the processed FSK signal to an AD sampling circuit for AD conversion to obtain a digital signal;
and 5: transmitting the digital signal to an FPGA for peak searching calculation to obtain peak time;
step 6: and transmitting the peak time to a CPU (central processing unit), and identifying and positioning the vehicle by the CPU according to the peak time to obtain the beacon position of the vehicle and finish the beacon positioning of the vehicle.
7. The vehicle localization system for railroad traffic of claim 6, wherein the signal processing further comprises the steps of:
step 3.1: transmitting the FSK signal to an attenuation network, performing amplitude control, and generating an FSK signal with the amplitude controlled;
step 3.2: transmitting the amplitude-controlled FSK signal to an electronic switch, and selecting a vehicle positioning circuit according to the amplitude-controlled FSK signal;
step 3.3: and transmitting the FSK signal with the controlled amplitude to a low-pass filter for noise reduction to obtain the processed FSK signal.
8. The vehicle localization system for railroad traffic of claim 6, wherein the peak finding calculation further comprises the steps of:
step 5.1: transmitting the digital signal to a reading module for reading and changing to obtain a beacon energy value;
step 5.2: transmitting the beacon energy value to a threshold comparison module, and comparing the beacon energy value with a threshold value arranged in the threshold comparison module;
step 5.3: when the beacon energy value is not larger than the threshold value, stopping calculation; and when the beacon energy value is larger than the threshold value, transmitting the beacon energy value to a peak searching module, and performing peak searching calculation on the beacon energy value larger than the threshold value to obtain the peak time.
9. The vehicle positioning system for railway traffic as claimed in claim 6, further comprising performing a system self-test on the vehicle positioning system through a self-test loop consisting of the CPU, the FPGA, the self-test module, the signal path circuit, the AD sampling circuit, the FPGA and the CPU.
10. A vehicle localization system for rail transit as claimed in claim 9, wherein the system self-test further comprises the steps of:
the CPU sends out a self-checking signal;
the FPGA generates a detection digital signal according to the self-detection signal;
the self-checking module carries out digital processing on the detection digital signal to obtain a detection analog signal; an electronic switch in the signal channel circuit selects a system self-checking circuit according to the detection analog signal, and performs signal processing on the detection analog signal to obtain a processed detection analog signal; the AD sampling circuit carries out AD conversion on the processed detection analog signal to obtain a self-checking digital signal;
the FPGA carries out peak searching processing on the self-checking digital signal to obtain a self-checking energy value;
and the CPU compares the self-checking energy value with an internal energy threshold value and judges that the vehicle positioning system completes the system self-checking of the vehicle positioning system.
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| CN113391196A (en) * | 2021-06-15 | 2021-09-14 | 卡斯柯信号有限公司 | Self-checking method for train-mounted speed measurement positioning board card |
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