CN115047743A - Time-consuming end high-precision time delay compensation method based on feedback - Google Patents
Time-consuming end high-precision time delay compensation method based on feedback Download PDFInfo
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Abstract
The invention relates to the technical field of electric digital information transmission, in particular to a feedback-based time-use end high-precision time delay compensation method, which comprises the following steps: outputting the standard time signal to a time output module; multi-path distribution of standard time signals; driving the signals to generate a plurality of paths of differential standard time signals for output; the multi-path differential standard time signals are fed back after being switched at the tail end of the transmission cable; the signal receiving unit receives the signal and outputs the signal to the time difference measuring unit; the time difference measuring unit measures time difference data between the reference signal and the measured signal and sends the time difference data to the time branching unit; the time branching unit calculates a compensation time delay value of the transmission cable; the time-splitting unit adjusts the delay values of the respective split outputs. The method provided by the invention has the advantages of simple implementation, good universality, low cost and the like, and realizes low-cost and high-precision time service of the user side when the time management equipment is used.
Description
Technical Field
The invention relates to the technical field of electric digital information transmission, in particular to a feedback-based time-use end high-precision time delay compensation method.
Background
At present, most of time system devices output multi-path point-to-point standard time information for a plurality of user devices to use, and the multi-path output of the time system devices can keep high precision and consistency at the device output interface end. However, in practical applications, long or short transmission cables are needed between the time-domain device and each user, and the lengths of the cables are long or short, so that the time delays of the transmission channels cannot be consistent, and thus, the time delay compensation cannot be simply and uniformly performed at the output end of the device. However, if the time delay of the output cable of the time system device is not compensated, the time information received by each user will have a certain deviation, and some high-precision application requirements cannot be met.
The time management equipment can also realize the automatic compensation of the transmission cable link time delay in a PTP/NTP network time service mode, but the NTP time service index is poor and is not suitable for high-precision time service occasions; the precision of the PTP time service is high, but in order to ensure the high precision of the PTP time service to adapt to the high precision time service occasion, a very high network configuration is required, and each user node is required to be equipped with a special time service board card, so that the cost is high, and the realization is difficult.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a feedback-based time-use end high-precision time delay compensation method which is simple to implement, good in universality and low in cost, so that the defect that the time delay of a transmission cable used by a user end is not accurately compensated when most of time system equipment arrives at the present time is overcome, and the low-cost and high-precision time service of the user end of the time system equipment in use is realized.
The invention is realized by the following technical scheme:
a feedback-based time-use end high-precision time delay compensation method specifically comprises the following steps:
s1: a time control module of the time system equipment generates a TTL standard time signal and outputs the TTL standard time signal to a time output module of the time system equipment;
s2, the time branching unit in the time output module distributes the received TTL standard time signals to the time difference measuring unit and the output driving unit in the time output module in a multi-path way;
s3, the output driving unit receives the multi-channel TTL standard time signals generated by the time branching unit, generates multi-channel differential standard time signals through driving and outputs the signals through an external output interface of the time management equipment;
s4, sending the instruction information of the delay compensation operation of the external output interface selected by the execution equipment to the time output module through the display control module;
s5, respectively connecting a plurality of external output interfaces of the time system equipment to a plurality of transmission cables, and feeding back a plurality of differential standard time signals to the external output interfaces of the time system equipment through the transmission cables after the transmission of the signals at the tail end of each transmission cable;
s6, the signal receiving unit in the time output module receives the differential standard time signals fed back by a plurality of transmission cables, and the differential standard time signals are respectively converted into TTL standard time signals through the level and then output to the time difference measuring unit in the time output module;
s7, the time difference measuring unit takes TTL form standard time signals input by the time branching units as measuring reference signals, takes TTL form standard time signals input by the signal receiving unit as measured signals, measures time difference data between the reference signals and the measured signals and sends the time difference data to the time branching units;
s8, the time shunting unit calculates the compensation time delay value of the transmission cable according to the time difference data output by the time difference measuring unit by the formula (1) and sends the time delay compensation state to the display control module;
wherein:
the cable delay value is transmitted for the ith output interface,
for the ith path time difference data；
The inherent time delay of the internal equipment of the time output module is obtained;
s9, the display control module receives the time delay compensation state of the time branching unit, and sends a time delay compensation ending instruction to the time branching unit after the time delay compensation information of all the external output interfaces is completed;
and S10, after the time branching unit receives the delay compensation ending instruction, all data are stored and solidified in the local storage unit, and the delay value output by the corresponding branch is adjusted according to the delay data, so that the high-precision compensation of the transmission cable delay is completed.
Further, a high-precision programmable delay chip is arranged in the time branching unit, and the time branching unit in S10 realizes high-precision compensation of the transmission cable delay by rewriting the delay value of the high-precision programmable delay chip.
Preferably, in S3, the output driving unit generates multiple differential standard time signals through driving of the differential RS422 driver.
Further, in S5, the multiple differential standard time signals are transferred at the end of each transmission cable through the transfer device.
Advantageous effects of the invention
The invention provides a feedback-based time-use end high-precision time delay compensation method, which has the following advantages: the differential form standard time information output by the time system equipment is switched and fed back at the tail end of the transmission cable, time difference measurement is carried out on the converted standard time information and the local TTL form standard time signal after the converted standard time information is converted into the TTL form standard time signal, the inherent time delay of the time delay compensation equipment is subtracted, and the difference value is divided by 2, so that accurate time delay values of cables with different lengths can be obtained, and high-precision compensation of the inherent transmission time delay of the cables with different lengths is completed. The invention has the advantages of simple realization, good universality, low cost and the like, can be used for overcoming the defect that the time delay of a transmission cable used by a user end is not accurately compensated when most of time system equipment is used at present, and realizes the low-cost and high-precision time service of the user end when the time system equipment is used.
Drawings
FIG. 1 is a schematic flow chart of a compensation method of the present invention;
FIG. 2 is a schematic block diagram of the compensation system of the present invention;
fig. 3 is a schematic diagram of a transition of a transmission cable.
Detailed Description
A time-use end high-precision time delay compensation method based on feedback is disclosed, the specific flow is shown as the attached figure 1, and the method specifically comprises the following steps:
s1: a time control module of the time system equipment generates a TTL standard time signal and outputs the TTL standard time signal to a time output module of the time system equipment; the TTL standard time signal here includes a point-to-point time service standard time such as 1PPS, IRIG-b (dc), and the like.
S2, the time branching unit in the time output module distributes the received TTL standard time signals to the time difference measuring unit and the output driving unit in the time output module in a multi-path way; the time shunting unit can divide the TTL form standard time signals generated by the time control module into a plurality of paths according to the number of the transmission cables, distribute the paths of signals to the time difference measuring unit and the output driving unit, so that the modules behind the time difference measuring unit can measure the difference form standard time signals of the plurality of paths of transmission cables with different lengths conveniently, convert the signals into the TTL form standard time signals, compare the signals with the TTL form standard time signals of the time system equipment, and calculate the compensation time delay value of each transmission cable.
S3, the output driving unit receives the multi-channel TTL standard time signals generated by the time branching unit, generates multi-channel differential standard time signals through driving and outputs the signals through an external output interface of the time management equipment; the output driving unit is arranged to convert the multi-path TTL standard time signals generated by the receiving time branching unit into multi-path differential standard time signals in a driving mode, so that the multi-path TTL standard time signals are transmitted in a long distance without distortion, the length of a transmission cable can reach about 1000m, if the multi-path TTL standard time signals are not converted through the output driving unit in a driving mode, the length of the transmission cable can only reach dozens of meters at the longest, and otherwise, the transmission signal distortion is caused to influence the compensation precision.
S4, sending the instruction information of the delay compensation operation of the external output interface selected by the execution equipment to the time output module through the display control module; the display control module is provided with a function setting interface, an external output interface needing cable delay compensation can be selected in the function setting interface, cable delay compensation options are executed, the display control module sends a corresponding instruction to the time output module according to the setting, and the operation is very simple and convenient.
S5, respectively connecting a plurality of external output interfaces of the time system equipment to a plurality of transmission cables, and feeding back a plurality of differential standard time signals to the external output interfaces of the time system equipment through the transmission cables after the transmission of the signals at the tail end of each transmission cable;
s6, the signal receiving unit in the time output module receives the differential standard time signals fed back by a plurality of transmission cables, and the differential standard time signals are respectively converted into TTL standard time signals through the level and then output to the time difference measuring unit in the time output module;
s7, the time difference measuring unit takes TTL form standard time signals input by the time branching units as measuring reference signals, takes TTL form standard time signals input by the signal receiving unit as measured signals, measures time difference data between the reference signals and the measured signals and sends the time difference data to the time branching units;
during specific measurement, the time difference measuring unit measures the time interval between the rising edge of the TTL form standard time signal output by the time branching unit and the rising edge of the TTL form standard time signal input by the corresponding signal receiving unit by using the time difference measuring circuit, and the time interval is time difference data.
S8, the time shunting unit calculates the compensation time delay value of the transmission cable according to the time difference data output by the time difference measuring unit by the formula (1) and sends the time delay compensation state to the display control module;
wherein:
is the ithThe output interface transmits the cable delay value,
the ith path of time difference data;
the inherent time delay of the internal equipment of the time output module is obtained;
due to the time difference data in equation (1)
Besides the time delay of the transmission cable, the time delay of the internal device of the time output module is also included
And therefore it needs to be subtracted therefrom, the inherent delay
The value of (b) can be obtained by a previously calibrated method. And due to the fact that
The value of (1) is the delay value of the transmission cable after the transmission cable is turned in and then turned out, so that the delay value must be divided by 2 to obtain the accurate delay value of the transmission cable.
S9, the display control module receives the time delay compensation state of the time branching unit, and sends a time delay compensation ending instruction to the time branching unit after the time delay compensation information of all the external output interfaces is completed;
and S10, after the time branching unit receives the delay compensation ending instruction, all data are stored and solidified in the local storage unit, and the delay value output by the corresponding branch is adjusted according to the delay data, so that the high-precision compensation of the transmission cable delay is completed.
The invention provides a feedback-based time-use high-precision time delay compensation method, which comprises the steps of distributing and driving TTL-form standard time signals in a multi-path mode by arranging a time output module, converting the TTL-form standard time signals into differential-form standard time signals, switching and feeding back the differential-form standard time signals at the tail end of a transmission cable, converting the differential-form standard time signals into the TTL-form standard time signals and local TTL-form standard time signals to perform time difference measurement, subtracting the inherent time delay of time delay compensation equipment, and dividing the difference by 2 to obtain accurate time delay values of cables with different lengths, thereby completing the high-precision compensation of the inherent transmission time delay of the cables with different lengths. The invention has the advantages of simple realization, good universality, low cost and the like, can be used for overcoming the defect that the time delay of a transmission cable used by a user end is not accurately compensated when most of time system equipment arrives at the time, and realizes the low-cost and high-precision time service of the user end when the time system equipment is in use, and the specific system schematic block diagram is shown as the attached figure 2.
Further, a high-precision programmable delay chip is arranged in the time branching unit, and the time branching unit in S10 realizes high-precision compensation of the transmission cable delay by rewriting the delay value of the high-precision programmable delay chip. The setting of the high-precision programmable delay chip can ensure that the delay of the corresponding transmission cable can be permanently compensated with high precision, and the delay compensation can be carried out again through the method unless the length of the transmission cable is changed.
Preferably, in S3, the output driving unit generates multiple differential standard time signals through driving of the differential RS422 driver. The differential RS422 driver can convert the multi-path TTL standard time signal generated by the time branching unit into the differential standard time signal, thereby realizing the long-distance transmission of the multi-path TTL standard time signal.
Further, in S5, the multiple differential standard time signals are switched at the end of each transmission cable by the switching device, and the specific switching diagram is shown in fig. 3. Due to the arrangement of the switching device, short circuit of output signals and input signals at the tail end of the transmission cable can be realized.
In summary, the feedback-based time-use-end high-precision time delay compensation method provided by the invention has the advantages of simple implementation, good universality, low cost and the like, can be used for overcoming the defect that the time delay of a transmission cable used by a user end is not accurately compensated when most of time system equipment arrives at the time, and realizes low-cost and high-precision time service of the user end when the time system equipment arrives at the time.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A time-use end high-precision time delay compensation method based on feedback is characterized by comprising the following steps:
s1: the time control module generates a TTL standard time signal and outputs the TTL standard time signal to the time output module;
s2, the time branching unit in the time output module distributes the TTL standard time signals to the time difference measuring unit and the output driving unit in the time output module in a multi-path mode;
s3, the output driving unit drives the multi-channel TTL standard time signals to generate multi-channel differential standard time signals and outputs the multi-channel differential standard time signals through an external output interface;
s4, sending the instruction information for executing the delay compensation operation of the selected external output interface to the time output module through the display control module;
s5, a plurality of external output interfaces are respectively connected with a plurality of transmission cables, and a plurality of differential standard time signals are switched at the tail ends of the transmission cables and then fed back to the corresponding external output interfaces through the transmission cables;
s6, the signal receiving unit in the time output module receives the differential standard time signals fed back by a plurality of transmission cables, and the differential standard time signals are respectively converted into TTL standard time signals through the level and then output to the time difference measuring unit in the time output module;
s7, the time difference measuring unit takes TTL form standard time signals input by the time branching units as reference signals, takes TTL form standard time signals input by the signal receiving unit as measured signals, measures time difference data between the reference signals and the measured signals and sends the time difference data to the time branching units;
s8, the time shunting unit calculates the compensation time delay value of the transmission cable according to the time difference data by the formula (1) and sends the time delay compensation state to the display control module;
wherein:
the cable delay value is transmitted for the ith output interface,
the ith path of time difference data;
the inherent time delay of the internal equipment of the time output module is obtained;
s9, the display control module sends a delay compensation ending instruction to the time branching unit after all the external output interfaces finish the transmission of the cable delay compensation information;
and S10, the time branching unit stores and solidifies all data in the local storage unit, and adjusts the delay value output by the corresponding branch according to the compensation delay value to finish the high-precision compensation of the transmission cable delay.
2. The feedback-based time-use high-precision time delay compensation method according to claim 1, wherein the time-splitting unit is provided with a high-precision programmable time delay chip, and the time-splitting unit in S10 implements the high-precision compensation of the transmission cable time delay by rewriting the delay value of the high-precision programmable time delay chip.
3. The feedback-based time-use high-precision time delay compensation method according to claim 1, wherein the output driving unit in S3 is driven by a differential RS422 driver to generate multiple paths of differential standard time signals.
4. The feedback-based time-use high-precision time delay compensation method according to claim 1, wherein the multiple differential standard time signals in S5 are switched at the end of each transmission cable by a switching device.
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