CN210401666U - B code generating unit and device - Google Patents
B code generating unit and device Download PDFInfo
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- CN210401666U CN210401666U CN201920878074.3U CN201920878074U CN210401666U CN 210401666 U CN210401666 U CN 210401666U CN 201920878074 U CN201920878074 U CN 201920878074U CN 210401666 U CN210401666 U CN 210401666U
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Abstract
The utility model discloses a B sign indicating number generating unit and device, include: the signal receiving circuit is used for receiving the time signal and the position signal and transmitting the received time signal and the received position signal to the signal processing circuit; and the signal processing circuit is used for processing the time signal and the position signal and generating a B-code digital signal carrying position information. The utility model discloses can provide time service and locate function, the B code digital signal of output is bi-polar difference digital signal, has stronger interference killing feature, is suitable for long distance transmission, and application scope is extensive.
Description
Technical Field
The utility model relates to a to time synchronous time service equipment technical field, especially indicate a B sign indicating number generating unit and device.
Background
The existing earthquake observation instrument generally receives and acquires accurate time and position information through a built-in GPS module or a Beidou module and a coaxial cable external antenna mode. Because some seismic observers are special in installation position, such as underground seismic observers erected in caves, underground wells, dams and mines, dam seismic observers, mine seismic observers and the like, the installation positions of the seismic observers are often far away from the antenna. In order to realize time service and positioning, a relay station for recovering and amplifying signals can be arranged between the earthquake observation instrument and the antenna, and after the signals are processed by the relay station, the signal precision can be influenced, and the signal to noise ratio can be reduced. The time service device is arranged near the antenna and can provide time signals for the earthquake observation instrument, but the output time signals of the existing time service device are single-ended TTL level signals, are not suitable for long-distance transmission, and do not provide position signals.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a B code generating unit and a device thereof, which have time service and positioning functions, and the output B code digital signal is suitable for long-distance transmission.
Based on the above-mentioned purpose, the utility model provides a B sign indicating number generating unit, include:
the signal receiving circuit is used for receiving the time signal and the position signal and transmitting the received time signal and the received position signal to the signal processing circuit;
and the signal processing circuit is used for processing the time signal and the position signal and generating a B-code digital signal carrying position information.
Optionally, the signal processing circuit includes:
the main processor is used for receiving the time signal and the position signal, coding the time signal and the position signal according to an IRIG-B code format and generating an IRIG-B code;
a time adjustment circuit for determining a standard time width based on a clock signal and the time signal;
the PWM circuit is used for carrying out pulse width modulation processing according to the standard time width and the IRIG-B code and outputting the IRIG-B code with the standard time width;
and the differential drive circuit is used for processing the IRIG-B code with the standard time width to generate a differential B code digital signal.
Optionally, the time adjustment circuit includes a counter, a clock oscillator, and a latch, and the time adjustment circuit measures the frequency of the clock oscillator according to the count value of the counter latched by the counter and the latch and the time signal, calculates the number of clock cycles required for 2 milliseconds, 5 milliseconds, and 8 milliseconds, respectively, according to the measurement result, and determines the standard time width.
Optionally, the position information and the auxiliary information are carried in a custom field of the IRIG-B code, and the auxiliary information includes elevation information, available satellite number, and positioning accuracy factor information.
The embodiment of the utility model provides a B sign indicating number generating device is still provided, including sealed casing and in it B sign indicating number generating unit.
Optionally, the sealing housing includes a base and an upper cover, the base and the upper cover are connected in a sealing manner, the B code generating unit is arranged in the accommodating space of the upper cover, and a connection cable led out by the B code generating unit is led out through an outlet on the base.
Optionally, a first wire outlet is formed in the base, a second wire outlet is formed in the side wall of the base, and the sealing ring is fixed in the first wire outlet through pressing of a pressing plate and a fixing piece and is filled with sealing glue in a sealing mode.
Optionally, a sealing ring is mounted at the connecting position of the upper cover and the base, and a sealing material is coated.
Optionally, the lower part of the base is provided with an insertion hole, and the insertion hole is used for inserting a supporting rod with adjustable insertion height.
Optionally, the upper cover and the base are made of polycarbonate materials, and anti-aging and anti-ultraviolet materials are mixed in the polycarbonate materials.
The utility model provides a B sign indicating number generating unit and device's advantage is:
1. the embodiment of the utility model provides a B sign indicating number generating unit, through signal reception circuit receipt time signal and position signal, through signal processing circuit to time signal and position signal processing, generate the B sign indicating number digital signal who carries positional information, can provide time service and locate function;
2. the embodiment of the utility model provides a B code generating unit, B code digital signal are bi-polar difference digital signal, have stronger interference killing feature, are suitable for long distance transmission, simultaneously, also can provide single-ended signal, satisfy single-ended signal's application demand;
3. the embodiment of the utility model provides a B sign indicating number generating device, including sealed casing and its inside B sign indicating number generating unit, waterproof, dampproofing, anticorrosion are suitable for all-weather outdoor use, can provide accurate time service and location function for the instrument of setting up in special positions such as open-air, environment badness;
4. the embodiment of the utility model provides a B sign indicating number generating device, with low costs, the device is miniaturized, the mountable in the indoor or outdoor different high position, application scope is extensive.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of a B code generation unit according to an embodiment of the present invention;
fig. 2 is a block diagram of a B code generating unit according to another embodiment of the present invention;
fig. 3 is a schematic flow chart illustrating the generation of the standard time width according to the embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a differential driving circuit according to an embodiment of the present invention;
fig. 5 is a waveform diagram of a data frame of an IRIG-B code according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a B code generator according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it is understood that "first" and "second" are only used for convenience of expression and should not be understood as limitations to the embodiments of the present invention, and the following embodiments do not describe any more.
Fig. 1 is a block diagram of a B code generation unit according to an embodiment of the present invention. As shown in the figure, the B code generating unit provided by the embodiment of the present invention includes a signal receiving circuit 10 and a signal processing circuit 20,
a signal receiving circuit 10 for receiving the time signal and the position signal and transmitting the received time signal and position signal to a signal processing circuit;
and a signal processing circuit 20, configured to process the time signal and the position signal to generate a B-code digital signal carrying position information.
The utility model discloses B sign indicating number generating element, through signal receiving circuit 10 receipt time signal and position signal, handle time signal and position signal through signal processing circuit 20, generate the B sign indicating number digital signal who carries positional information, and this B sign indicating number digital signal is for the digital signal who accords with IRIG-B (Inter Range Instrumentation group) time code format, and the self-defined position of this IRIG-B sign indicating number is the positional information of code. The B code digital signal output by the B code generating unit has strong anti-interference capability, is suitable for long-distance transmission, and can provide time service and positioning functions for instruments installed at special positions.
Fig. 2 is a block diagram of a B code generation unit according to another embodiment of the present invention. As shown, in some embodiments, the signal receiving circuit 10 includes a GPS module, a compass module and an antenna module, and can receive a positioning signal and a time signal through the GPS module, the compass module and the antenna module. Optionally, the signal receiving circuit can select a GPS and Beidou dual-mode time service module integrating a GPS module, a Beidou module and an antenna module, wherein the antenna module is a passive ceramic antenna.
The signal processing circuit 20 includes a main processor, a time adjustment circuit, a PWM circuit, a differential drive circuit,
the main processor is used for receiving the time signal and the position signal sent by the signal receiving circuit, coding the time signal and the position signal according to an IRIG-B code format and generating an IRIG-B code;
a time adjustment circuit for determining a standard time width based on the clock signal and the received time signal;
the PWM circuit is used for carrying out pulse width modulation processing according to the standard time width and the IRIG-B code and outputting the IRIG-B code with the standard time width;
and the differential drive circuit is used for processing the IRIG-B code with the standard time width to generate a differential B code digital signal.
In some embodiments, the signal receiving circuit 10 is connected to a signal input terminal of the host processor, and the signal receiving circuit 10 transmits the received time signal and the received position signal to the host processor. And the main processor receives the time signal and the position signal, determines the time precision and the positioning precision, and codes the time signal and the position signal according to an IRIG-B code format to obtain an IRIG-B code. The main processor may use a single chip microcomputer.
In some embodiments, the main processor receives position signals and auxiliary signals acquired by the Beidou module, the auxiliary signals comprise elevation signals, satellite number signals and positioning accuracy factor signals, and the main processor encodes the time signals, the position signals and the auxiliary signals according to an IRIG-B code format to obtain IRIG-B codes.
The time adjusting circuit comprises a clock oscillator, a counter and a latch. The clock oscillator provides a clock signal for the main processor, and the clock oscillator cannot output the clock signal with high precision due to the influence of various factors such as temperature, precision and aging. The embodiment of the utility model provides an in, confirm standard time width jointly according to clock oscillator's clock signal and the time signal of receipt for synchronous IRIG-B sign indicating number specifically is:
and measuring the frequency of the clock oscillator according to the counter and the received time signal, calculating in real time according to the measurement result to obtain a clock period required by the standard time width, and generating an accurate standard time width for synchronously transmitting the IRIG-B code. Fig. 3 is a schematic flow chart of generating the standard time width according to the embodiment of the present invention, as shown in the figure, according to the PPS signal (pulse per second signal) output by the beidou module, the count value of the latch counter is latched, that is, a count value is latched (one count value is recorded per second) for each PPS signal, the latch value of the latch is cleared after being used, and each latch value is a count value from zero; the code element width of each code element of the IRIG-B code coded by the main processor is determined by common calculation of the current latch value and 9 latch values of the first 9 seconds, and clock cycles of 2 milliseconds, 5 milliseconds and 8 milliseconds respectively corresponding to the IRIG-B code are obtained. For example, the latch values of the latches are C1, C2, and C3 … C10, so that the clock period required for a 2-ms symbol width is 2 × (C1+ C2+ C3+ C4+ C5+ C6+ … + C10)/10000, the clock period required for a 5-ms symbol width is 5 × (C1+ C2+ C3+ C4+ C5+ C6+ … + C10)/10000, the clock period required for an 8-ms symbol width is 8 × (C1+ C2+ C3+ C4+ C5+ C6+ … + C10)/10000, and the clock period required for a 10-ms symbol width is 10 × (C10 + 10 + C10)/3610000). And according to the IRIG-B code coded by the main processor and the calculated clock cycles corresponding to different code elements, performing pulse width modulation processing through a PWM circuit, outputting the IRIG-B code subjected to clock cycle adjustment to obtain the IRIG-B code with standard time width, and realizing the function of outputting a synchronous clock by the B code.
Fig. 4 is a schematic circuit diagram of a differential driving circuit according to an embodiment of the present invention. As shown in the figure, the IRIG-B code with the standard time width output by the PWM circuit is input into the differential drive circuit for processing, and a differential B code digital signal is obtained.
In some embodiments, the differential driver circuit includes Schmitt triggers 17-19, 23-25, resistors 20-22, 26-28, 31-33, and diodes 29, 30. Schmitt triggers 17, 18 and 19 carry out shaping driving on the input IRIG-B code, B code digital signals of differential negative terminals are output through resistors 20, 21 and 22, Schmitt triggers 23, 24 and 25 carry out shaping driving on the input IRIG-B code, and B code digital signals of differential positive terminals are output through resistors 26, 27 and 28; the resistors 31, 32 and 33 form a resistor network, and the amplitudes of the B-code digital signal at the negative differential end and the B-code digital signal at the positive differential end are adjusted by adjusting the resistance value proportional relation of the resistors 31, 32 and 33. In one embodiment, the B-code digital signal may be conditioned to a differential signal with +1.5 volts at an intermediate level. The diodes 29 and 30 are surge protection devices, and the reliability of the B code generating unit can be improved.
The utility model discloses B sign indicating number digital signal of B sign indicating number generating unit output can satisfy current single-ended TTL level and use, also can provide the application of bi-polar differential signal output, and differential B sign indicating number digital signal has stronger interference killing feature, is suitable for remote transmission. In this embodiment, multiple sets of schmitt triggers are used in parallel, so that the capability of driving current can be improved, the transmission distance of the differential B-code digital signal can be prolonged, the differential B-code digital signal can be transmitted by about 1 kilometer, and accurate time and position information can be provided for an instrument installed at a special position.
Fig. 5 is a waveform diagram of a data frame of an IRIG-B code according to an embodiment of the present invention. As shown, the IRIG-B code encoded by the main processor includes time information, location information, and auxiliary information. The main processor encodes the received time signal, position signal and auxiliary signal according to an IRIG-B code format and a custom format, as shown in the figure, each data frame of the encoded IRIG-B code consists of 100 code elements, each 10 code elements are provided with a position identification mark, and the total number of the position identification marks is P0-P9 ten, wherein the code elements included in P0-P4 carry time information, namely second, minute, hour and day information, and P5-P7 is a custom field; in some embodiments, the self-defined field is used to carry the position information, so that the digital signal of the B code output by the B code generating unit is a signal including time information and position information, thereby providing time and positioning functions for the instrument.
TABLE 1
Table 1 shows the encoding format and definition of the position information and the auxiliary information carried by the custom fields P5-P7 according to the embodiment of the present invention. When P5 is 000000010, P6 is the north latitude or south latitude information of ASCII encoding format, when P5 is 000000011, P6 and P7 are latitude integer information of BCD encoding format, and when P6 is 000000100, P6 and P7 are latitude decimal information of BCD encoding format; similarly, longitude information may be determined from P5-P7; when P5 is 000001000, P6 is the number of available satellites in BCD coding format; when P5 is 000001001, P6 and P7 are elevation information in BCD encoding format; when P5 is 000001010, P6 and P7 are DOP positioning precision factor information in BCD encoded format.
As shown in fig. 2, the B-code generating unit further includes a power conversion circuit for converting an external input power into a power required by the signal receiving circuit 10 and the signal processing circuit 20. In some embodiments, the B code generating unit is connected to an external cable through a connection cable, wherein the connection cable includes a power input terminal and a signal output terminal. Optionally, the connection cable may be a four-core cable, two cores of the four-core cable are used as a power supply to input a 9-25 v dc power supply, the input dc power supply is converted into a 3 v voltage and a 5 v voltage by a power conversion circuit, and the 3 v voltage and the 5 v voltage are respectively supplied to the signal receiving circuit 10 and the signal processing circuit 20; and the other two cores of the four-core cable are used as signal output ends of the differential B-code digital signals of the B-code generating unit.
Fig. 6 is a schematic structural diagram of a B code generator according to an embodiment of the present invention. As shown in the figure, the embodiment of the utility model provides a B sign indicating number generating device, including sealed casing and its inside B sign indicating number generating unit.
The sealed shell comprises a base 2 and an upper cover 1, the base 2 is connected with the upper cover 1 in a sealing mode, and the B code generating unit is arranged in the accommodating space of the upper cover. Specifically, the signal receiving circuit 10 is disposed on the first circuit board 31, the signal processing circuit 20 is disposed on the second circuit board 32, the first circuit board 31 and the second circuit board 32 are electrically connected through the socket 4, and the time signal and the position signal received by the signal receiving circuit 10 are transmitted to the signal processing circuit 20 through the socket.
As shown in fig. 6, the second circuit board 32 is fixedly connected to the base 2, the second circuit board 32 is fixed to the pillar 21 of the base 2 by a fixing member, the base 2 is provided with a first outlet 22, the sidewall of the base 2 is provided with a second outlet 23, and the connection cable led out from the B-code generating unit extends through the first outlet 22 and the second outlet 23, and can be connected to an instrument through an external cable for providing time service and positioning functions for the instrument.
In some embodiments, the sealing shell has a sealing and waterproof function. The first outlet 22 is pressed and fixed with the sealing ring 5 through the pressing plate 6 and the fixing piece 7, and is filled with sealant. The pillar 21 outside of base 2 is equipped with connecting portion, and the relevant position of upper cover 1 is equipped with the cooperation connecting portion, and the connecting portion of base 2 is connected with the cooperation connecting portion cooperation of upper cover 1, and sealing washer 8 is installed to the hookup location of the two, and waterproof material is paintd to the connecting portion of base 2. In some embodiments, the connection is a thread and the mating connection is a mating thread.
The installation steps of the B code generator of the embodiment of the present invention are that the first circuit board 31 and the second circuit board 32 are connected through the socket 4, and the second circuit board 32 is fixedly connected to the pillar 21 of the base 2 through a fixing member (such as a screw); leading out the connection cable welded on the second circuit board 32 through the first outlet 22 and the second outlet 23, installing the sealing ring 5 in the first outlet 22, pressing and fixing the sealing ring 5 through the pressing plate 6 and the fixing piece 7, and encapsulating the first outlet 22 by using a sealant; after the installation of the internal components, the sealing ring 8 is installed at the connecting part of the base 2, then the waterproof material (such as waterproof silicone grease) is evenly smeared on the connecting part of the base 2, and then the matching connecting part of the upper cover 1 is matched and connected with the connecting part of the base 2. The utility model discloses B sign indicating number generating device has good waterproof, anticorrosive and sealed effect, and waterproof grade can reach IP68 grade, can be suitable for outdoor all-weather use.
In some embodiments, the cover 1 and the base 2 are made of polycarbonate materials, and anti-aging and anti-ultraviolet materials (such as light stabilizers) are mixed in the polycarbonate materials, so that the B code generating device has waterproof and anti-corrosion functions.
In some embodiments, the bottom of the base 2 is provided with a plug hole for inserting the height-adjustable support rod 9, and the B code generator can be installed at different height positions by adjusting the height of the support rod 9. A wiring cable of the B code generating device can be connected with an instrument through an external cable, the instrument can be an underground earthquake observation instrument, a dam earthquake observation instrument, a mine earthquake observation instrument and the like which are erected in special positions in the field, in harsh environments and the like, and the instrument can acquire accurate time information and position information through the B code generating device.
The apparatus of the foregoing embodiment is used to implement the corresponding method in the foregoing embodiment, and has the beneficial effects of the corresponding method embodiment, which are not described herein again.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
In addition, well known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown in the provided figures for simplicity of illustration and discussion, and so as not to obscure the invention. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the invention, it should be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.
The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A B-code generating unit, comprising:
the signal receiving circuit is used for receiving the time signal and the position signal and transmitting the received time signal and the received position signal to the signal processing circuit;
and the signal processing circuit is used for processing the time signal and the position signal and generating a B-code digital signal carrying position information.
2. The B-code generating unit according to claim 1, wherein the signal processing circuit comprises:
the main processor is used for receiving the time signal and the position signal, coding the time signal and the position signal according to an IRIG-B code format and generating an IRIG-B code;
a time adjustment circuit for determining a standard time width based on a clock signal and the time signal;
the PWM circuit is used for carrying out pulse width modulation processing according to the standard time width and the IRIG-B code and outputting the IRIG-B code with the standard time width;
and the differential drive circuit is used for processing the IRIG-B code with the standard time width to generate a differential B code digital signal.
3. The B-code generating unit according to claim 2, wherein the time adjusting circuit includes a counter, a clock oscillator, and a latch, and the time adjusting circuit measures the frequency of the clock oscillator according to the count value of the counter latched by the counter and the latch and the time signal, calculates the number of clock cycles required for 2 milliseconds, 5 milliseconds, and 8 milliseconds, respectively, according to the measurement result, and determines the standard time width.
4. The B-code generating unit according to claim 2, wherein the position information and the auxiliary information are carried in a custom field of the IRIG-B code, and the auxiliary information includes elevation information, available satellite number, and positioning accuracy factor information.
5. A code B generation device, which is characterized by comprising a sealed shell and a code B generation unit according to any one of claims 1 to 4 in the sealed shell.
6. The device of claim 5, wherein the sealed housing comprises a base and an upper cover, the base and the upper cover are connected in a sealing manner, the B code generating unit is arranged in the accommodating space of the upper cover, and the wiring cable led out by the B code generating unit is led out through an outlet on the base.
7. The device of claim 6, wherein the base has a first outlet, the sidewall of the base has a second outlet, and the first outlet is pressed by the pressing plate and the fixing member to fix the sealing ring and is filled with a sealant.
8. The device of claim 6, wherein the connecting position of the upper cover and the base is provided with a sealing ring and coated with sealing material.
9. The device of claim 6, wherein the bottom of the base is provided with a plug hole for inserting the height-adjustable support rod.
10. The apparatus of claim 6, wherein the cover and base are made of polycarbonate material with anti-aging and anti-UV materials mixed therein.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110109157A (en) * | 2019-06-12 | 2019-08-09 | 中国地震局地震预测研究所 | A kind of B code generating unit and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110109157A (en) * | 2019-06-12 | 2019-08-09 | 中国地震局地震预测研究所 | A kind of B code generating unit and device |
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