CN104320237B - A kind of pulse per second (PPS) encodes setting means - Google Patents
A kind of pulse per second (PPS) encodes setting means Download PDFInfo
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- CN104320237B CN104320237B CN201410529692.9A CN201410529692A CN104320237B CN 104320237 B CN104320237 B CN 104320237B CN 201410529692 A CN201410529692 A CN 201410529692A CN 104320237 B CN104320237 B CN 104320237B
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Abstract
A kind of pulse per second (PPS) encodes setting means, is related to a kind of distributed system time synchronized, and principle is host node control node level, and for reception state and rising edge interrupt processing is used to node level from node from node.Step A）：Host node is in time t0Lifting section level point, while by communication bus master time t0It is broadcast to by way of whole pulse per second (PPS) all described from node；Step B）：Described triggers interruption from node when level is driven high, and retains current from node time t1；Step C）：It is described that the t that the host node is broadcast in a manner of whole pulse per second (PPS) is received from node0Afterwards, preserve now from node time t2, by the way that new lock in time t is calculatedIt is synchronous=t2+（t0‑t1）.Compared with prior art, the present invention only need by communication bus by host node to from node transmit whole pulse per second (PPS) just can be accurate pair when, this method need not increase other communication hardwares, greatly reduce cost during synchronous pair of distributed system.
Description
Technical field
It is particularly a kind of accurate same using whole pulse per second (PPS) coding the present invention relates to a kind of distribution type system time synchronous method
Method during step pair.
Background technology
Under distributed system, each node disjoint, each self clock, time phase difference can be increasing between causing node.For
The time consistency of guarantee each node in special time, it is necessary to make it that each node time is synchronous.During existing distributed system
Between synchronous method be roughly divided into two kinds：One kind is that host node is based on ICP/IP protocol to partial node progress time service；Another kind is point
Node increases the internal clocking that special clock circuit safeguards partial node, needs Ethernet if by ICP/IP protocol time service
Support, if the special clock circuit of increase will cause hardware cost to increase.
The content of the invention
The present invention is directed to deficiency of the prior art, there is provided a kind of pulse per second (PPS) encodes setting means, it is only necessary to by logical
Letter bus allow host node to from node transmit whole pulse per second (PPS) just can be accurate pair when, make host node synchronous with from node time, it is our
Method need not increase other communication hardwares, greatly reduce cost during synchronous pair of distributed system.
In order to solve the above-mentioned technical problem, the present invention is addressed by following technical proposals：A kind of pulse per second (PPS) coding pair
Shi Fangfa, it is characterised in that host node control node level is reception state from node and described is adopted from node to node level
With rising edge interrupt processing, specifically comprising following steps：
Step A)：Described host node is in time t0Lifting section level point, while by communication bus master time t0
It is broadcast to by way of whole pulse per second (PPS) all described from node；
Step B)：Described triggers interruption from node when level is driven high, and retains current from node time t1；
Step C)：It is described that the t that the host node is broadcast in a manner of whole pulse per second (PPS) is received from node0Afterwards, preserve now
From node time t2, by the way that new lock in time t is calculatedIt is synchronous=t2+(t0-t1)。
In above-mentioned technical proposal, it is preferred that it is described to be divided into whole number of seconds S, two sections of millisecond number MS from node time, with
Symbol A:B forms represent that then current time is S:MS；When it is described receive whole pulse per second (PPS) from node when, if now
Millisecond MS<500, it is S to set the time now:0, as now millisecond MS>500, it is S+1 to set the time now:0.
In above-mentioned technical proposal, it is preferred that t is transmitted in described whole pulse per second (PPS) in a manner of encoding0The UTC number of seconds of time,
And by following coding：
Setting be encoded to 1 and 0 composition, when for 1 when transmit the whole pulse per second (PPS), when for 0 when do not transmit the whole pulse per second (PPS),
Transmit t0Temporal information needs 70 bits data altogether, and both described host node transmitted t by the whole pulse per second (PPS)0Temporal information
Needed altogether from node 70 seconds to described, t0Coding is as follows respectively：
Frame head length 4bits, is encoded to 0111；
Time span 64bits, UTC time, which is converted into after 2 systems, needs 32bits, and the code 1 in 32bits data is with 01
Represent, code 0 represents with 10, both now each bit come with 2 bits it is encoded translated, then from the past high position sequence of low level；
Even parity check length 2bits, 1 is represented with 01 in the even parity check that UTC time is 32, and 0 is represented with 10.
In above-mentioned technical proposal, it is preferred that the t0Time when time is first bit (value is 0) for transmitting frame head.
In above-mentioned technical proposal, it is preferred that it is described to be decoded since when node receives continuous three whole pulse per second (PPS)s, and
Using first received whole pulse per second (PPS) time+1s as t1Time.
In above-mentioned technical proposal, it is preferred that the whole pulse per second (PPS) time received from node when even parity check to the end encodes
For t2Time, both transmit t0Time during last bit of time encoding.
The lock in time of this method is defined by host node, while respectively from node also in the independence maintenance time, and each node is inclined
Difference is within 100ppm (the most deviation 0.1ms of 1s).This method is by temporal information (t0) after coding by way of whole pulse per second (PPS)
It is broadcast to from node.Temporal information coding using Binary Zero, 1 represent, and assert when for 1 when transmit the whole pulse per second (PPS), when
For 0 when do not transmit the whole pulse per second (PPS).The 32bits follow-up code of sequeling of UTC time binary code is obtained, is 01,0 for 10 with 1
Temporal information is extended for 64bits binary code, and it is because continuous three are not present in 64bits temporal informations so to set
111 codings, and frame head 4bits is encoded to 0111, so can is learnt after three whole pulse per second (PPS)s are continuously received from node
What is received is frame head, so as to start to decode.The time t for the temporal information for receiving frame head is preserved from node1With received even school
Test temporal information t2, by calculating t2+(t0-t1) lock in time to the end.Whole temporal information stream has 70bits, passes through
Whole pulse per second (PPS) transfer mode needs to cause after 70s all synchronous with master time from node.Simultaneously first is received from node
When whole pulse per second (PPS), if now millisecond MS<500, it is S to set the time now:0, as now millisecond MS>500, this is set
When time be S+1:0, due to receiving after first whole pulse per second (PPS) just so that millisecond number is changed into 0 so that in synchronous phase
Number of seconds will not changed.By this set, the whole pulse per second (PPS) of host node transmitting can be each received from node, with for the moment
Carried out in section time calibration, the same deadline at time point is synchronous.Again because whole pulse per second (PPS) is precise and stable, by this method
Synchronous time deviation rate is low, and accuracy is high, does not have to extra communication device again, both reduces hardware cost, also reduce because
For time synchronized deviation caused by communication delay.
Compared with prior art, the beneficial effects of the invention are as follows：Only need by communication bus by host node to from node
Whole pulse per second (PPS) is transmitted when just can be accurate pair, makes host node synchronous with from node time, it is hard that this method need not increase other communications
Part, greatly reduce cost during synchronous pair of distributed system.
Embodiment
The present invention is described in further detail with reference to embodiment.
Embodiment：It is all from node that host node determines that transmission time information is broadcast to when UTC time is 1399583471,
Then UTC time 1399583471 is t0Time, 1399583471 conversion binary systems are
11110111010011111101011011001010, common 32bits.It 01,0 is 10 to be converted to continue 1 to be
01010101100101011001101001010101010110011001011001011010 01100110, common 64bits.It is even
1 is verified as, into 01 after changing, common 2bits；Frame head 0111, common 4bits.Total coding is
01110101010110010101100110100101010101011001100101100101 10100110011001, altogether
70bits.Whole pulse per second (PPS) is sent when being wherein 1, is not sent when being 0, (both frames after continuous three whole pulse per second (PPS)s are received from node
It is first 0111) to start to decode, while the whole pulse per second (PPS) reception time+1s of record first is t1, both in frame head first code 0 hair
Send the time；The whole pulse per second (PPS) time that record receives when even parity check to the end encodes is t2Time, obtain t1、t2And t0Afterwards from node
By calculating t2+(t0-t1) with regard to the time synchronous with host node can be obtained.
Claims (5)
1. a kind of pulse per second (PPS) encodes setting means, it is characterised in that host node control node level, from node be reception state and
Described to use rising edge interrupt processing to node level from node, t is transmitted in whole pulse per second (PPS) in a manner of encoding0The UTC seconds of time
Number, and by following coding：Setting is encoded to 1 and 0 composition, when for 1 when transmit the whole pulse per second (PPS), when for 0 when do not transmit it is described
Whole pulse per second (PPS), transmit t0Temporal information needs 70 bits data altogether, i.e. described host node transmits t by the whole pulse per second (PPS)0
Temporal information needs 70 seconds altogether to described from node, t0Coding is as follows respectively：Frame head length 4bits, is encoded to 0111；Time is grown
64bits is spent, UTC time, which is converted into after 2 systems, needs 32bits, and the code 1 in 32 bits data represents that code 0 is used with 01
10 represent, i.e., now each bit with 2 bits come it is encoded translated, then from low level toward a high position sequence；Even parity check length 2bits,
1 is represented with 01 in the even parity check that UTC time is 32, and 0 is represented with 10；Specifically include following steps：Step A）：Described
Host node is in time t0Lifting section level point, while by communication bus master time t0It is wide by way of whole pulse per second (PPS)
It is multicast to all described from node；Step B）：Described triggers interruption from node when level is driven high, retain it is current from
Node time t1；Step C）：It is described that the t that the host node is broadcast in a manner of whole pulse per second (PPS) is received from node0Afterwards, this is preserved
When from node time t2, by the way that new lock in time t is calculatedIt is synchronous =t2+（t0- t1）.
A kind of 2. pulse per second (PPS) coding setting means according to claim 1, it is characterised in that it is described can from node time
It is divided into whole number of seconds S, two sections of millisecond number MS, with symbol A:B forms represent that then current time is S:MS；When described from section
When point receives whole pulse per second (PPS), if now millisecond MS<500, it is S to set the time now:0, as now millisecond MS>500,
It is S+1 to set the time now:0.
A kind of 3. pulse per second (PPS) coding setting means according to claim 1, it is characterised in that the t0Time is transmission frame
The time during bit of first of head.
4. a kind of pulse per second (PPS) coding setting means according to claim 1, it is characterised in that described to be received from node
Start to decode during continuous three whole pulse per second (PPS)s, and first to receive whole pulse per second (PPS) time+1s is t1Time.
5. a kind of pulse per second (PPS) coding setting means according to claim 1, it is characterised in that described to be received most from node
Whole pulse per second (PPS) time when even parity check encodes afterwards is t2Time, that is, transmit t0Time during last bit of time encoding.
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| CN113259045B (en) * | 2021-07-14 | 2021-09-28 | 四川腾盾科技有限公司 | Remote control real-time transmission processing method for large unmanned aerial vehicle |
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| CN101515831A (en) * | 2008-02-22 | 2009-08-26 | 杭州华三通信技术有限公司 | Method, system and device for time synchronous transfer |
| CN101420269A (en) * | 2008-12-02 | 2009-04-29 | 华为技术有限公司 | Method, device and system for time synchronization |
| CN101710849A (en) * | 2009-11-04 | 2010-05-19 | 中国电力科学研究院 | Single signal wire synchronous clock transfer method |
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