CN101710845B - Method for carrying out unidirectional transmission time delay test by using GPS system - Google Patents
Method for carrying out unidirectional transmission time delay test by using GPS system Download PDFInfo
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- CN101710845B CN101710845B CN2009100846870A CN200910084687A CN101710845B CN 101710845 B CN101710845 B CN 101710845B CN 2009100846870 A CN2009100846870 A CN 2009100846870A CN 200910084687 A CN200910084687 A CN 200910084687A CN 101710845 B CN101710845 B CN 101710845B
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Abstract
The invention provides a method for carrying out a unidirectional transmission time delay test by using a GPS system. A second pulse signal output by a GPS receiving module triggers a characteristic code sequence of a sending end to be sent; and a receiving end starts a counter to start counting after receiving the characteristic code sequence and stops counting when next second pulse is output, so the unidirectional time delay can be calculated. The invention does not need to arrange a high-precision clock in a test instrument and simultaneously solves the problem that the times of meters in two places are difficult to synchronize.
Description
Technical field
The present invention relates to the communications latency measurement, relate in particular to a kind of method of utilizing gps system to carry out unidirectional transmission time delay test.
Background technology
Along with the optical fiber transmission network construction, Optical Fiber Transmission progressively develops into the circulus with self-healing function by original more single point-to-point linear structure.In the middle of circulus, possibly exist a plurality of sensible routes between any 2.Because different routes exist: the path of transmission process is different, the intermediate transit number of devices is different, the differences such as inherent delay difference of various device, and possibly there is relatively more significant delay inequality (possibly reach a few tens of milliseconds) in the up-downgoing that finally shows as between 2.Some business is to propagation delay time responsive (propagation delay time like the relay protection of power system signal requires less than 5 milliseconds), especially the up-downgoing delay inequality had (electric power system require time delay difference can not greater than being not more than 200 microseconds) of strict demand.How to guarantee the unanimity of signal transmission route, delay inequality satisfies business need, a problem that is to use these professional clients to pay special attention to.
In the communication test field, measure at present, a kind of mode of loopback test is only arranged to propagation delay time.Loopback test can only measure the summation (loop time delay) of up-downgoing time delay, can not confirm the concrete numerical value of up-downgoing time delay, the time delay in the promptly single transmission direction.
Technical scheme
The object of the present invention is to provide a kind of can the test, and obtain the method for concrete time delay numerical value One Way Delay.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is following:
A kind of method of utilizing gps system to carry out unidirectional transmission time delay test comprises:
The first step, the maximum delay of testing as required select to be provided with GPS pulse per second (PPS) output gap;
Second the step, connect test instrumentation at two testing locations;
The test instrumentation of the 3rd step, transmitting terminal sends feature code sequence under the pps pulse per second signal of GPS receiver module output triggers;
The 4th the step, receiving terminal test instrumentation continue to monitor the reception signal, in case detect feature code sequence immediately the enabling counting device begin the counting, provide the signal extraction clock to count with fiber optic transmission system;
The 5th step, receiving terminal timer stop counting under the pps pulse per second signal of GPS receiver module output triggers;
The 6th the step, through calculating the One Way Delay of measurement:
The One Way Delay t1=GPS pulse per second (PPS) output gap T-counter t2 that fixes time,
The counter t2=timer count value/signal transmission rate of fixing time.
It is following that the present invention utilizes gps system to carry out another technical scheme of method of unidirectional transmission time delay test:
The first step, the maximum delay of testing as required select to be provided with GPS pulse per second (PPS) output gap;
Second the step, connect test instrumentation at two testing locations;
The 3rd step, transmitting terminal send feature code sequence under the pps pulse per second signal of GPS receiver module output triggers;
The 4th step, receiving terminal timer enabling counting device under the pps pulse per second signal of GPS receiver module output triggers begins counting, provides the signal extraction clock to count with fiber optic transmission system;
The 5th step, receiving terminal continue to monitor the reception signal, stop counting immediately in case detect feature code sequence;
The 6th the step, through calculating the One Way Delay of measurement: timer count value/signal transmission rate.
Beneficial effect of the present invention:
Utilize GPS to communicate the method for system's unidirectional transmission time delay test, need not solve the problem of two places instrument time synchronized difficulties simultaneously at the built-in high precision clock of tester.
Description of drawings
Fig. 1 is the pulse per second (PPS) figure on the time shaft of the present invention;
Fig. 2 is triggered the time chart of feature code sequence by pulse per second (PPS) for transmitting terminal of the present invention;
Fig. 3 is the time chart of receiving terminal of the present invention by the timing of condition code enabling counting device;
Fig. 4 is that condition code of the present invention detects figure;
1 is pulse per second (PPS), and 2 is feature code sequence.
Embodiment
Referring to accompanying drawing 1, accompanying drawing 2 and accompanying drawing 3, embodiment of the present invention is following:
GPS (GPS) is except providing locating information such as latitude, longitude and height; Accurate time service (time service precision: 30 nanoseconds) can also be provided; The present invention is through the pulse per second (PPS) 1 of GPS receiver module output; The feature code sequence 2 of triggering transmitting terminal is sent, and receiving terminal enabling counting devices after receiving feature code sequence 2 begin counting (providing the signal extraction clock to count with fiber optic transmission system), when one-second burst 1 is exported down, stops counting.Can obtain One Way Delay through calculating like this:
The One Way Delay t1=GPS pulse per second (PPS) output gap T-counter t2 that fixes time,
Counter (t2)=timer count value/signal transmission rate of fixing time.
GPS pulse per second (PPS) output gap generally has 0.5,1, more than 10 kinds to select, pulse of output in promptly per 0.5 second, 1 second, 10 seconds.
Described feature code sequence is one section binary element that is easy to detect at background signal.As under the all-ones background 0000111001110000.
A kind of method of utilizing gps system to carry out unidirectional transmission time delay test of the present invention, the practical implementation step is following:
The first step, the maximum delay of testing as required select to be provided with GPS pulse per second (PPS) output gap;
Second the step, connect test instrumentation at two testing locations;
The test instrumentation of the 3rd step, transmitting terminal sends feature code sequence under the pulse per second (PPS) 1 of GPS receiver module output triggers;
The 4th the step, referring to accompanying drawing 4; The test instrumentation of receiving terminal continues to monitor the reception signal; In case detect feature code sequence 2 (changeing and shift register and 16 bit comparators) through string immediately the enabling counting device begin counting, provide the signal extraction clock to count with fiber optic transmission system;
The 5th step, receiving terminal timer stop counting under the pulse per second (PPS) 1 of GPS receiver module output triggers;
The 6th the step, through calculating the One Way Delay of measurement:
The One Way Delay t1=GPS pulse per second (PPS) output gap T-counter t2 that fixes time,
The counter t2=timer count value/signal transmission rate of fixing time.
The execution mode of another technical scheme of the present invention is following:
The first step, the maximum delay of testing as required select to be provided with GPS pulse per second (PPS) output gap;
Second the step, connect test instrumentation at two testing locations;
The 3rd step, transmitting terminal send feature code sequence under the pps pulse per second signal of GPS receiver module output triggers;
The 4th step, receiving terminal timer enabling counting device under the pps pulse per second signal of GPS receiver module output triggers begins counting, provides the signal extraction clock to count with fiber optic transmission system;
The 5th step, receiving terminal continue to monitor the reception signal, stop counting immediately in case detect feature code sequence;
The 6th the step, through calculating the One Way Delay of measurement: timer count value/signal transmission rate.
Claims (2)
1. utilize gps system to carry out the method for unidirectional transmission time delay test, it is characterized in that:
The first step, the maximum delay of testing as required select to be provided with GPS pulse per second (PPS) output gap;
Second the step, connect test instrumentation at two testing locations;
The 3rd step, transmitting terminal send feature code sequence under the pps pulse per second signal of GPS receiver module output triggers;
The 4th step, receiving terminal continues to monitor the reception signal, in case detect feature code sequence immediately the enabling counting device begin counting, provide the signal extraction clock to count with fiber optic transmission system;
The 5th step, receiving terminal timer stop counting under the pps pulse per second signal of GPS receiver module output triggers;
The 6th the step, through calculating the One Way Delay of measurement:
The One Way Delay t1=GPS pulse per second (PPS) output gap T-counter t2 that fixes time,
The counter t2=timer count value/signal transmission rate of fixing time,
Described feature code sequence is one section binary element that under background signal, is easy to detect.
2. utilize gps system to carry out the method for unidirectional transmission time delay test, it is characterized in that:
The first step, the maximum delay of testing as required select to be provided with GPS pulse per second (PPS) output gap;
Second the step, connect test instrumentation at two testing locations;
The 3rd step, transmitting terminal send feature code sequence under the pps pulse per second signal of GPS receiver module output triggers;
The 4th step, receiving terminal timer enabling counting device under the pps pulse per second signal of GPS receiver module output triggers begins counting, provides the signal extraction clock to count with fiber optic transmission system;
The 5th step, receiving terminal continue to monitor the reception signal, stop counting immediately in case detect feature code sequence;
The 6th the step, through calculating the One Way Delay of measurement: timer count value/signal transmission rate,
Described feature code sequence is one section binary element that under background signal, is easy to detect.
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| CN2009100846870A CN101710845B (en) | 2009-05-22 | 2009-05-22 | Method for carrying out unidirectional transmission time delay test by using GPS system |
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| CN2009100846870A CN101710845B (en) | 2009-05-22 | 2009-05-22 | Method for carrying out unidirectional transmission time delay test by using GPS system |
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| CN101710845B true CN101710845B (en) | 2012-03-28 |
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| CN102447515B (en) * | 2011-09-26 | 2014-10-08 | 中国空间技术研究院 | System and method for testing satellite-ground time delay and onboard time errors |
| CN103944633B (en) * | 2014-04-01 | 2016-08-24 | 广东科学技术职业学院 | TD-LTE MIMO indoor radio signal profile fiber transmission link fault detection module and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1599291A (en) * | 2003-09-15 | 2005-03-23 | 华东电网有限公司 | Method for measuring transmission time-delay of telemechanical system by GPS |
| CN101067656A (en) * | 2007-05-25 | 2007-11-07 | 北京航空航天大学 | Position attitude system hardware time synchronizing method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1599291A (en) * | 2003-09-15 | 2005-03-23 | 华东电网有限公司 | Method for measuring transmission time-delay of telemechanical system by GPS |
| CN101067656A (en) * | 2007-05-25 | 2007-11-07 | 北京航空航天大学 | Position attitude system hardware time synchronizing method |
Non-Patent Citations (1)
| Title |
|---|
| 潘乔 等.基于GPS的端到端时延测量方法设计方案.《电讯技术》.2003,第43卷(第6期), * |
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