CN103051409A - Shortwave channel synchronous device and shortwave channel synchronous switching control system - Google Patents
Shortwave channel synchronous device and shortwave channel synchronous switching control system Download PDFInfo
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- CN103051409A CN103051409A CN2012105739699A CN201210573969A CN103051409A CN 103051409 A CN103051409 A CN 103051409A CN 2012105739699 A CN2012105739699 A CN 2012105739699A CN 201210573969 A CN201210573969 A CN 201210573969A CN 103051409 A CN103051409 A CN 103051409A
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Abstract
The invention discloses a shortwave channel synchronous device and a shortwave channel synchronous switching control system; the device comprises a reference clock generation unit, a clock calibration unit and a clock synchronization unit; the reference clock generation unit is used for receiving local clock pulse based on a synchronous trigger command, and sends reference pulse to the clock calibration unit by taking 1 millisecond as the scale; the clock calibration unit is used for calibrating the accumulated errors of a local clock through the standard second pulse which is sent by a standard clock source, and outputting the calibrated reference pulse to the clock synchronization unit; and the clock synchronization unit is used for starting to receive the reference pulse which is sent by the clock calibration unit when the current time is in alignment with the channel switching time, and outputting the switching trigger pulse when the reference pulse receiving times reaches the set times, wherein N*1ms is equal to the channel residing time. According to the shortwave channel synchronous device and the shortwave channel synchronous switching control system, the local clock can be used for converting the second pulse into the pulse by 1 millisecond, and outputting the time interval of any time scale with the precision reaching the millisecond level according to the configuration.
Description
Technical field
The present invention relates to the channel synchronization technical field of Shortwave Communication System, relate in particular to a kind of short wave channel synchronizer and the synchronous handover control system of short wave channel.
Background technology
The dispersive channel that becomes when short-wave ionospheric radio channel is a kind of, its channel parameter, all be constantly to change with frequency, place, time such as path loss, time delay spread, Noise and Interference etc., therefore in shortwave sky wave communication, the shortwave frequency-selecting is the most important prerequisite of transmission success.For a long time, frequency-selecting is carried out in the Long-term forecasting of radiothermy frequency, and this method is utilized the optimum frequency under the Changing Pattern prediction average condition of ionospheric structure and Ionospheric Parameters, can instruct the design of short-wave link.But when Long-term forecasting is applied to concrete link and special time, sizable error often occurs, but cause the problem such as the low and bad channel quality of passband, greatly hindered the development of short wave communication.In recent years, come the real-time prediction frequency information and carry out real time frequency selection in short wave communication link employing Real-time Channel valuation (RTCE), from having overcome to a great extent the fatal disadvantages such as the communication quality that causes owing to the short wave channel parameter time varying is low, unreliable.
The Real-time Channel estimate method is for particular link, send the detectable signal of certain form, receiving end is measured various parameters one group of predetermined channel, by real-time processing measured data, determine the communication quality index that when this certain communication service of group channel, may reach, thereby provide reliable frequency resource information for communication line.Therefore no matter the Real-time Channel estimate method is independently to adopt in the detection system, or directly adopts in communication system, all take the scan channel detection as the basis.In asynchronous system, transmitting-receiving two-end can be rested on the identical channel, the way of usually taking to prolong transmitting time improves the reliability of reception, so greatly reduces the real-time of channel guess value.Therefore, usually adopt the mode of synchronizing channel scanning probe to realize the Real-time Channel valuation.In the channel synchronization problem, the accurate aligning that how to keep channel switching time is the key problem that needs solve.
At present, for the wireless communication system of overlength distance, the time synchronizing method that the most often uses is to utilize global GPS/ Big Dipper synchronous satellite, and for distant at a distance each equipment of being separated by in the system provides unified reference clock source, the clock cycle property of each equipment and reference clock carry out synchronously.The prerequisite that this method of synchronization can be applied to Real-time Channel valuation system is that the error sum of reference clock and local clock is within channel accuracy switching time allowed band.The time interval between channel switches is the every channel residence time during scan channel is surveyed, switching capability by detection information length, detection waveform transmission rate and hardware device determines, generally with the millisecond note, needs hundreds of to several thousand milliseconds, therefore, channel need to be accurate to Millisecond switching time.At present, GPS can provide the pulse per second (PPS) of error less than 50 nanoseconds, and local clock stable accuracy degree is easy to reach 1ppm even higher, and therefore 1 millisecond of its worst error was no more than for 1 nanosecond, and accurately synchronised clock can be provided enough in theory.But, every channel residence time is not whole second integral multiple usually, therefore channel may differ certain intervals with whole second switching time, can't directly utilize the GPS pulse per second (PPS) to control switching time, also can't only utilize the GPS pulse per second (PPS) to produce take the channel residence time as time scale channel switching interval.Therefore, how to design a kind of scheme, so that it can utilize local clock with GPS pulse per second (PPS) cutting to 1 millisecond calibration clock, and arbitrary disposition channel residence time as required, the time interval of output take the channel residence time as time scale, ensure that each device synchronization switches on the identical channel in the communication system, become the technical problem that needs to be resolved hurrily at present.
Summary of the invention
In view of the above problems, the present invention has been proposed in order to a kind of short wave channel synchronizer and synchronous handover control system of short wave channel that overcomes the problems referred to above is provided.
Concrete, according to one aspect of the present invention, provide a kind of short wave channel synchronizer, comprising:
The reference clock generation unit is used for based on synchronous triggering command, receives local clock pulse, and take 1 millisecond as scale, to clock alignment unit transmission reference pulse;
The clock alignment unit, the standard second pulse that is used for utilizing standard clock source to send is calibrated the accumulated error of local clock, and the reference pulse after will calibrating exports the clock synchronous unit to;
The clock synchronous unit, be used for the current time when channel aligns switching time, begin to receive the reference pulse of described clock alignment unit transmission, and when the number of times that receives reference pulse reaches the times N of setting, the output switching trigger impulse; Wherein, N satisfies N * 1ms and equals the channel residence time.
Further, in the described device of the embodiment of the invention, described reference clock generation unit, concrete being used for after initially powering on, detect the standard second pulse that whether receives sign on and standard clock source transmission, if, then begin to receive local clock pulse, and take millisecond as scale, when reaching for every millisecond, send reference pulse to described clock alignment unit.
Further, in the described device of the embodiment of the invention, described reference clock generation unit specifically comprises:
Logical block L1 is used for being judged to be and receiving synchronous triggering command, to timer T1 output logic 1 when receiving the standard second pulse of sign on and standard clock source transmission;
Counter C1 is used for receiving the reference pulse behind the described clock alignment sing1e unit calibration, and when receiving reference pulse at every turn, current count value and 1 is done mould 1000 additions obtain new count value;
Logical block L2 is used for count value at described counter C1 at 0 ~ 998 o'clock, to timer T1 output logic 1; Otherwise, output logic 0;
Timer T1 is used for when described logical block L1 and the equal output logic 1 of logical block L2, from the pulse of local clock receive clock, and take 1 millisecond as scale, to the output reference pulse of described clock alignment unit.
Further, in the described device of the embodiment of the invention, described timer T1, specifically be used for whenever receiving a local clock pulse and just timing added 1, and when the number of times that receives local clock pulse reaches K/1000 time, the output reference pulse, and restart to repeat said process from zero timing; Wherein, K is clock frequency.
Further, in the described device of the embodiment of the invention, described clock alignment unit, concrete being used for take per second as calibration accuracy, during in per second the 1st ~ 999 millisecond, the reference pulse that described reference clock generation unit is sent exports described clock synchronous unit to, in the time of the 1000th millisecond, the standard second pulse of standard clock source is sent to described clock synchronous unit, realizes the calibration to the local clock accumulated error.
Further, in the described device of the embodiment of the invention, described clock synchronous unit specifically comprises:
Timer C2 is used for receiving the reference pulse of described clock alignment unit output, and when receiving reference pulse, current count value is added 1 at every turn;
Logical block L4 is used for reading the count value of described counter C2, and with this count value with the zero hour interval X compare, when described count value equated with X, the judgement current time alignd with channel switching time, all the time to timer T2 output logic 1; Wherein, described zero hour, interval X was channel switching instant and a nearest time interval of whole second;
Timer T2, be used for when described logical block L4 output logic 1, begin to receive the reference pulse that described clock alignment unit sends, and when the number of times that receives reference pulse reaches the times N of setting, to the channel switch unit output switching trigger impulse of device rear end.
According to another aspect of the present invention, provide a kind of short wave channel synchronous handover control system, comprising: main control unit, channel switch unit and short wave channel synchronizer of the present invention;
Described main control unit is used to described short wave channel synchronizer and channel switch unit configurating channel handoff parameter, and sends sign on to described short wave channel synchronizer;
Described channel switch unit is used for the handover trigger pulse according to described short wave channel synchronizer transmission, and the delivery channel switching command is realized the channel switching controls.
Preferably, in the described system of the embodiment of the invention, described main control unit is that the channel handoff parameter of described short wave channel synchronizer configuration comprises at least: channel residence time and channel switching instant and a nearest time interval X of whole second; Described main control unit is that the channel handoff parameter of described channel switch unit configuration comprises at least: take the time point of certain setting as benchmark, and the corresponding relative time Tx of current time that the absolute time of utilizing standard clock source to provide converts and obtains.
Preferably, in the described system of the embodiment of the invention, the mode of described main control unit configurating channel switching instant and a nearest time interval X of whole second comprises: time interval X=k*t-Tx-1; Wherein, t is the channel residence time, and k satisfies X〉0 smallest positive integral;
The switching command of described channel switch unit output comprises the channel number of switching; Wherein, the account form of described channel number comprises:
Wherein, t is that channel residence time, N are the channel number.
Beneficial effect of the present invention is as follows:
Device of the present invention and system, can realize by the pulse per second (PPS) that standard clock source provides the accurate calibration between each equipment of total system, and can pulse per second (PPS) be converted into pulse with 1 millisecond of time scale with local clock, reach the time interval of the random time scale of Millisecond by the configuration output accuracy; Simultaneously the present invention also provides the channel synchronization handover control system based on this short wave channel synchronizer, can ensure at any time that each device synchronization switches on the identical channel in the communication system, this system can be combined with shortwave detection system or communication system, realizes synchronous Real-time Channel scanning probe.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do one to the accompanying drawing of required use in embodiment or the description of the Prior Art and introduce simply, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural representation of a kind of short wave channel synchronizer that Fig. 1 provides for the embodiment of the invention;
The structural representation of the another short wave channel synchronizer that Fig. 2 provides for the embodiment of the invention;
The structural representation of the synchronous handover control system of a kind of short wave channel that Fig. 3 provides for the embodiment of the invention;
The structural representation of the synchronous handover control system of another short wave channel that Fig. 4 provides for the embodiment of the invention;
Fig. 5 is the sequential chart of each unit in the described system of the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the invention provides a kind of short wave channel synchronizer and the synchronous handover control system of short wave channel, described device can utilize local clock with the clock of standard second pulse (GPS pulse per second (PPS)) cutting to 1 millisecond scale, arbitrary disposition channel residence time is exported the time interval take the channel residence time as time scale as required; Simultaneously, can by this interval output switching instruction, ensure that each device synchronization switches on the identical channel in the communication system.Below just by several specific embodiments, the specific implementation process of device of the present invention and system is elaborated.
Embodiment one
As shown in Figure 1, the embodiment of the invention provides a kind of short wave channel synchronizer, specifically comprises: reference clock generation unit 110, clock alignment unit 120 and clock synchronous unit 130;
Reference clock generation unit 110 is used for based on synchronous triggering command, receives local clock pulse, and take 1 millisecond as scale, 120 send reference pulses to the clock alignment unit;
Clock synchronous unit 130, be used for the current time when channel aligns switching time, begin to receive the reference pulse of described clock alignment unit 120 transmissions, and when the number of times that receives reference pulse reaches the times N of setting, the output switching trigger impulse; Wherein, N satisfies N * 1ms and equals the channel residence time.
The basic principle of the pulse take the channel residence time as scale based on said apparatus structure framework and realization output, the below is described in detail the specific implementation process of above-mentioned each unit:
(1) in the present embodiment, described reference clock generation unit 110, concrete being used for after initially powering on, detect the standard second pulse that whether receives sign on and standard clock source transmission, if (namely receiving synchronous triggering command) then begins to receive local clock pulse, and take millisecond as scale, when reaching for every millisecond, 120 send reference pulse to the clock alignment unit.
Preferably, described reference clock generation unit 110 is realized the output of reference pulse by following device: reference clock generation unit 110 specifically comprises: logical block L1, counter C1, logical block L2 and timer T1, wherein:
Logical block L1 is used for being judged to be and receiving synchronous triggering command, to timer T1 output logic 1 when receiving the standard second pulse of sign on and standard clock source transmission;
Counter C1 is used for receiving the reference pulse behind the described clock alignment sing1e unit calibration, and when receiving reference pulse at every turn, current count value and 1 is done mould 1000 additions obtain new count value;
Logical block L2 is used for count value at described counter C1 at 0 ~ 998 o'clock, to timer T1 output logic 1; Otherwise, output logic 0;
Timer T1 is used for when described logical block L1 and the equal output logic 1 of logical block L2, from the pulse of local clock receive clock, and take 1 millisecond as scale, to the output reference pulse of described clock alignment unit.
Preferably, specifically in the following way output reference pulse of described timer T1: timer T1 whenever receives a local clock pulse and just timing is added 1, and when the number of times that receives local clock pulse reaches K/1000 time, the output reference pulse, and restart to repeat said process from zero timing; Wherein, K is clock frequency.
(2) in the embodiment of the invention, described clock alignment unit 120, concrete being used for take per second as calibration accuracy, during in per second the 1st ~ 999 millisecond, the reference pulse that reference clock generation unit 110 is sent exports clock synchronous unit 130 to, (when per second arrives) is sent to clock synchronous unit 130 with the standard second pulse of standard clock source in the time of the 1000th millisecond, realizes the calibration to the local clock accumulated error.
Preferably, every millisecond accurate control is realized by the count value of monitoring counter C1 in clock alignment unit 120.That is to say, clock alignment unit 120 reads the value of counter C1, when the count value of counter C1 is 0 ~ 998 (the 1st ~ 999 millisecond), and the reference pulse that output receives, when the count value of counter C1 is 999, output GPS pulse per second (PPS).
(3) in the embodiment of the invention, clock synchronous unit 130 specifically comprises:
Timer C2 is used for receiving the reference pulse of described clock alignment unit output, and when receiving reference pulse, current count value is added 1 at every turn;
Logical block L4 is used for reading the count value of described counter C2, and with this count value with the zero hour interval X compare, when described count value equated with X, the judgement current time alignd with channel switching time, all the time to timer T2 output logic 1; Wherein, described zero hour, interval X was channel switching instant and a nearest time interval of whole second;
Timer T2, be used for when described logical block L4 output logic 1, begin to receive the reference pulse that described clock alignment unit sends, and when the number of times that receives reference pulse reaches the times N of setting, to the channel switch unit output switching trigger impulse of device rear end.
Embodiment two
The embodiment of the invention provides a kind of short wave channel synchronizer, this embodiment is identical with the realization principle of embodiment one, difference is in the present embodiment each unit among the embodiment one to be launched to set forth, by the connection between each device and processing procedure, realize the further description to the short wave channel synchronizer.
The described short wave channel synchronizer of the embodiment of the invention is used to the synchronous handover control system of shortwave to provide channel to switch that aim at the zero hour and the synchronised clock take any channel residence time t second as scale.
The described short wave channel synchronizer of the embodiment of the invention can be realized at a fpga chip, as shown in Figure 2, comprises logical block L1, L2, L3 and L4, timer T1 and T2 and counter C1 and C2.Wherein, logical block control timer sum counter begins under correct logical relation or quits work, thereby eliminates the error of different time scale accumulative total; Timer obtains the pulse input by scale sometime, by another time scale output pulse, to finish the conversion of different time scale; Counter assists logical block to produce correct logical relation, to obtain unanimously and to begin accurately timing time.Particularly:
Whether logical block L1 is used for one of condition that arranges timer T1 unlatching, by to timer T1 output 1 or 0, satisfy in order to characterize this unlocking condition.Namely judge two input: whether sign on and GPS pulse per second (PPS) all arrive, when both fail to arrive, and output 0; In case both arrive, keep output is 1 always.
Whether logical block L2 for two of the condition that timer T1 unlatching is set, by to timer T1 output 1 or 0, satisfies in order to characterize this unlocking condition.The initial output 1 of L2 when the input value of obtaining from counter C1 is 0-998, keeps being output as 1; Otherwise, output is changed to 0.
Timer T1 produces 1 millisecond of pulse take the pulse signal of local clock as benchmark.T1 opens timing when the input of obtaining from logical block L1 and L2 all is 1, and input not all is to stop timing at 1 o'clock.When timer was opened, the pulse that T1 whenever receives a local clock just added 1 with timing, and T1 restarts from 0 timing when receiving K/1000 time, and K is clock frequency; Whenever the T1 timing is 0 o'clock, to pulse of logical block L3 output, just in time form take 1 millisecond of output pulse as scale; When timer cuts out, outwards do not export pulse.
Logical block L3 utilize the GPS pulse per second (PPS) to calibrate the accumulated error of local clock, and 1 millisecond of pulse after will calibrating exports timer T2, counter C1 and C2 to.Logical block L3 can obtain from the not pulse of two kinds of time scales of homology, be 1 millisecond of pulse and the GPS pulse per second (PPS) that T1 produces, the clock source of 1 millisecond of pulse is local clock, the accumulation of its time jitter can cause the synchronous error between the different shortwave equipment, and the clock source of GPS pulse per second (PPS) is common clock, thereby available its calibrated the elimination accumulated error to local clock.Specific practice is that the input value of obtaining from counter C1 as L3 is 0-998, and 1 millisecond of pulse that T1 produces is exported; The input value of obtaining from counter C1 as L3 is 999, and the GPS pulse per second (PPS) is exported.
Counter C1 is used to logical block L2 and L3 that accurate 1 millisecond of step-by-step counting is provided, and auxiliary L2 arranges the condition that timer T1 opens, and auxiliary L3 arranges the condition that receives the input of different clocks source.Counter C1 initial value is 0, whenever receives 1 millisecond of pulse that a secondary logical unit (SLU) L3 sends here, just current count value and 1 is done mould 1000 additions and is obtained the New count value.
Counter C2 is used to logical block L4 that accurate 1 millisecond of step-by-step counting is provided, and auxiliary L4 arranges the condition that timer T2 opens.Counter C2 initial value is 0, whenever receives 1 millisecond of pulse that a secondary logical unit (SLU) L3 sends here, just current count value is delivered to logical block L4, again count value is added 1.
Logical block L4 is used for the initial time that timer T2 opens is set, and this initial time is alignd with channel switching time.Whether L4 satisfies in order to characterize this unlocking condition by to timer T2 output 1 or 0.The count value of sending here as counter C2 the and when zero hour, interval X was unequal, L4 was output as 0, in case equate, output just remains 1.The zero hour, interval X referred to channel switching instant and a nearest time interval of whole second, when channel residence time t is whole second multiple, and X=0; When t is not whole second multiple, 0＜X＜1000 millisecond.
Timer T2 is used for 1 millisecond of pulses switch is the pulse take channel residence time t second as scale.When obtain from logical block L4 be input as 1 the time T2 begin from timing.T2 whenever receive pulse that L3 sends here then timing add 1, T2 restarts from 0 timing when receiving the 1000*t subpulse, whenever the T2 timing is, outwards exports a pulse at 0 o'clock, just in time forms the output pulse take t second as scale.
Embodiment three
As shown in Figure 3, the embodiment of the invention provides a kind of short wave channel synchronous handover control system, be used for the control Shortwave Communication System and switch at any time same channel by the method for synchronization, described control system specifically comprises: main control unit, channel switch unit and embodiment one/embodiment two described short wave channel synchronizers.
In the described system of the present embodiment, the frequency of the local clock of employing is the K hertz, and clock accuracy stability 1ppm even higher powers up rear every millisecond and transmits K/1000 pulse to the short wave channel synchronizer; The described system of the present embodiment adopts GPS/ Big Dipper module to send once current absolute time T by the serial ports per second to main control unit, provides pulse per second (PPS) by Transistor-Transistor Logic level alignment short wave channel synchronizer, and precision can reach for 50 nanoseconds.
Particularly, in the described system of the present embodiment: main control unit is the administrative unit of whole system, is responsible for instruction and running parameter that in system unit sends the self-application layer, coordinates each unit and carries out the work.Main control unit is take ARM as core, and major function comprises: (1) receives the sign on from application layer, configurating channel residence time t; (2) receive and resolve gps data, the absolute time T that GPS is reported and submitted is converted into the relative time Tx take certain agreement zero hour as starting point; (3) calculate channel and switch the interval X zero hour, X=k*t-Tx-1, wherein t is the channel residence time, k satisfies X〉0 smallest positive integral; (4) to lock unit transmit sign on and the zero hour parameter such as interval X, channel residence time t; (5) transmit relative time Tx to the channel switch unit.
In the described system of the present embodiment, described short wave channel synchronizer take fpga chip as core, is used for providing channel to switch that aim at the zero hour and the synchronised clock take any channel residence time t second as scale, and concrete principle is as described in the embodiment one, two.
In the described system of the present embodiment, described channel switch unit take dsp chip as core, is used for calculating current switching channels F (Tx) according to relative time Tx, and based on the pulse-triggered of short wave channel synchronizer, sends switching command to the radio station.Wherein, switching command comprises the channel number of switching.If the scanning channel group comprises N channel, channel number is followed successively by n=0,1 ..., N-1, then the communication equipment of different location can calculate corresponding channel number according to Tx
Dsp chip also is responsible for the realization of scan channel flow process, the scan channel flow process is concrete with mode is relevant frequently with Shortwave Communication System, whether this flow process determines and need at switching channels on corresponding opportunity, because the scan channel flow process is not emphasis of the present invention, not do specific descriptions at this.
Embodiment four
The embodiment of the invention provides a kind of short wave channel synchronous handover control system, and this embodiment is in conjunction with concrete example further elaborating embodiment one, two described devices and embodiment three described systems.
As shown in Figure 4, structural representation for the described system of the embodiment of the invention, in the present embodiment, if Shortwave Communication System is carried out synchronous scanning by channel residence time 1.2 seconds to the channel group that comprises 80 channels, local clock is the 5MHz clock, take 00:00:00 second on the same day as start time, adopt the synchronous handover control system of the described short wave channel of the embodiment of the invention, after assigning sign in 13: 11: 20, the process of each radio station in the Shortwave Communication System being carried out the synchronizing channel switching is as follows.
As shown in Figure 5, be the sequential chart of the described system of the present embodiment, after the system power-up, GPS/ Big Dipper module and local clock clk transmit pulse to the short wave channel synchronizer constantly, wherein, GPS/ Big Dipper module transmitted pulsatile once every 1 second, and local clock transmits pulsatile once every 200 nanoseconds; Initial value after all timers and timer power up in the lock unit is 0, and the initial output valve of logical block L1 and L4 is 0, and the initial output valve of logical block L2 is 1.
Main control unit after receiving the application layer sign on, configurating channel residence time t=1.2 second; Read the absolute time that the GPS serial ports is sent here, time this moment is 13: 11: 20, and the absolute time of channel switching should be within next second so, and namely T is 13: 11: 21; During with T(13 11 minutes 21 seconds) be converted into relative time Tx=13x3600+11x60+21=47481 second; Know that according to definition k is greater than the smallest positive integral of (Tx+1)/t, calculate k=39569, bring X=k*t-Tx-1 into and obtain the channel switching interval X=39569*1.2-47481-1=800 millisecond zero hour, namely began in 47481.8 seconds to switch at relative time; Logical block L1, L4 in the lock unit and timer T2 transmit respectively sign on, zero hour interval X=800, channel residence time t=1.2; Transmit relative time Tx=47481 to the channel switch unit.
The short wave channel synchronizer utilizes local clock and GPS pulse per second (PPS) to carry out time alignment and time synchronized according to the input of main control unit.Detailed process is as follows:
Logical block L1 waits for that the GPS pulse per second (PPS) arrives after obtaining the sign on of main control unit, in case receive the GPS pulse per second (PPS), just output valve is set to 1, and keeps this output valve until outage always.As seen from Figure 5, L1 was output as 0 before 13: 11: 21, be output as afterwards 1.
Logical block L2 is output as 1 after powering up, 1 millisecond is output as 0 before 13: 11: 22, then is output as 1 after 13: 11: 22, and namely front 999 milliseconds of per second are output as 1, timer T1 is set opens; Last 1 millisecond is output as 0, timer T1 is set closes.
Timer T1 is unlatching in 1 o'clock at L1 and L2, open stage whenever receives a clk pulse and just timing is added 1, T1 restarts from 0 timing during timing 5000 times (200 nanosecond x5000=1 millisecond), whenever the T1 timing is 0 o'clock, to pulse of logical block L3 output, just in time form take 1 millisecond of output pulse as scale.
The input value that logical block L3 obtains from counter C1 is 0-998, and 1 millisecond of pulse that T1 produces is exported; The input value of obtaining from counter C1 as L3 is 999, and the GPS pulse per second (PPS) is exported.Logical block L3 form take 1 millisecond as time scale with pulse, export timer C1 and C2 to, and timer T2.
Counter C1 whenever receives 1 millisecond of pulse that a secondary logical unit (SLU) L3 sends here, just current count value and 1 is done mould 1000 additions and is obtained the New count value.
Counter C2 whenever receives 1 millisecond of pulse that a secondary logical unit (SLU) L3 sends here, just count value is added 1, stops when count value increases to maximum.
Logical block L4 with the count value of counter C2 and the zero hour interval X=800 make comparisons, L4 is output as 0 when the two does not wait, in case equate, output just remains 1.As seen from Figure 5, L4 was output as 0 before 47481.8 seconds, was output as afterwards 1.
Timer T2 is output as unlatching in 1 o'clock at logical block L4, opens after namely 47481.8 seconds.T2 whenever receive pulse that L3 sends here then timing add 1, T2 restarts from 0 timing when receiving 1200 subpulse, whenever the T2 timing is, outwards exports a pulse at 0 o'clock, just in time form the output pulse take t=1.2 second as scale, this pulse exports switch unit to.
The channel switch unit sends switching command on the opportunity of needs to the radio station according to the scan channel flow process, and switching command comprises the channel number of switching by the pulse-triggered that lock unit transmits.If the relative time that switches is Tx=47481 second, then can calculate corresponding channel number according to Tx
Namely be n=0 for the channel ordering, 1 ..., 79 channel group, will be when absolute time 13 11 minutes 21 seconds 800 milliseconds, relative time sent an instruction control radio station in 47481.8 seconds to switch to channel number be 34 channel; Then switch to next channel every 1200 milliseconds of control radio station, namely 11 minutes 23 seconds, relative time sent an instruction control radio station in 47483 seconds to switch to channel number are 35 channel when absolute time 13; By that analogy, form the scanning sequence that switched a channel every 1.2 seconds.
In sum, the described device of the embodiment of the invention and system, can realize by the pulse per second (PPS) that standard clock source provides the accurate calibration between each equipment of total system, and can pulse per second (PPS) be converted into pulse with 1 millisecond of time scale with local clock, reach the time interval of the random time scale of Millisecond by the configuration output accuracy; Simultaneously the present invention also provides the channel synchronization handover control system based on this short wave channel synchronizer, can ensure at any time that each device synchronization switches on the identical channel in the communication system, this system can be combined with shortwave detection system or communication system, realizes synchronous Real-time Channel scanning probe.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. a short wave channel synchronizer is characterized in that, comprising:
The reference clock generation unit is used for based on synchronous triggering command, receives local clock pulse, and take 1 millisecond as scale, to clock alignment unit transmission reference pulse;
The clock alignment unit, the standard second pulse that is used for utilizing standard clock source to send is calibrated the accumulated error of local clock, and the reference pulse after will calibrating exports the clock synchronous unit to;
The clock synchronous unit, be used for the current time when channel aligns switching time, begin to receive the reference pulse of described clock alignment unit transmission, and when the number of times that receives reference pulse reaches the times N of setting, the output switching trigger impulse; Wherein, N satisfies N * 1ms and equals the channel residence time.
2. short wave channel synchronizer as claimed in claim 1, it is characterized in that, described reference clock generation unit, concrete being used for after initially powering on, detect the standard second pulse that whether receives sign on and standard clock source transmission, if, then begin to receive local clock pulse, and take millisecond as scale, when reaching for every millisecond, send reference pulse to described clock alignment unit.
3. short wave channel synchronizer as claimed in claim 2 is characterized in that, described reference clock generation unit specifically comprises:
Logical block L1 is used for being judged to be and receiving synchronous triggering command, to timer T1 output logic 1 when receiving the standard second pulse of sign on and standard clock source transmission;
Counter C1 is used for receiving the reference pulse behind the described clock alignment sing1e unit calibration, and when receiving reference pulse at every turn, current count value and 1 is done mould 1000 additions obtain new count value;
Logical block L2 is used for count value at described counter C1 at 0～998 o'clock, to timer T1 output logic 1; Otherwise, output logic 0;
Timer T1 is used for when described logical block L1 and the equal output logic 1 of logical block L2, from the pulse of local clock receive clock, and take 1 millisecond as scale, to the output reference pulse of described clock alignment unit.
4. short wave channel synchronizer as claimed in claim 3, it is characterized in that, described timer T1, specifically be used for whenever receiving a local clock pulse and just timing added 1, and when the number of times that receives local clock pulse reaches K/1000 time, the output reference pulse, and restart to repeat said process from zero timing; Wherein, K is clock frequency.
5. such as each described short wave channel synchronizer of claim 1 to 4, it is characterized in that, described clock alignment unit, concrete being used for take per second as calibration accuracy, during in per second the 1st～999 millisecond, the reference pulse that described reference clock generation unit is sent exports described clock synchronous unit to, in the time of the 1000th millisecond, the standard second pulse of standard clock source is sent to described clock synchronous unit, realizes the calibration to the local clock accumulated error.
6. such as each described short wave channel synchronizer of claim 1 to 4, it is characterized in that, described clock synchronous unit specifically comprises:
Timer C2 is used for receiving the reference pulse of described clock alignment unit output, and when receiving reference pulse, current count value is added 1 at every turn;
Logical block L4 is used for reading the count value of described counter C2, and with this count value with the zero hour interval X compare, when described count value equated with X, the judgement current time alignd with channel switching time, all the time to timer T2 output logic 1; Wherein, described zero hour, interval X was channel switching instant and a nearest time interval of whole second;
Timer T2, be used for when described logical block L4 output logic 1, begin to receive the reference pulse that described clock alignment unit sends, and when the number of times that receives reference pulse reaches the times N of setting, to the channel switch unit output switching trigger impulse of device rear end.
7. short wave channel synchronizer as claimed in claim 5 is characterized in that, described clock synchronous unit specifically comprises:
Timer C2 is used for receiving the reference pulse of described clock alignment unit output, and when receiving reference pulse, current count value is added 1 at every turn;
Logical block L4 is used for reading the count value of described counter C2, and with this count value with the zero hour interval X compare, when described count value equated with X, the judgement current time alignd with channel switching time, all the time to timer T2 output logic 1; Wherein, described zero hour, interval X was channel switching instant and a nearest time interval of whole second;
Timer T2, be used for when described logical block L4 output logic 1, begin to receive the reference pulse that described clock alignment unit sends, and when the number of times that receives reference pulse reaches the times N of setting, to the channel switch unit output switching trigger impulse of device rear end.
8. the synchronous handover control system of short wave channel is characterized in that, comprising: each described short wave channel synchronizer of main control unit, channel switch unit and claim 1 to 7;
Described main control unit is used to described short wave channel synchronizer and channel switch unit configurating channel handoff parameter, and sends sign on to described short wave channel synchronizer;
Described channel switch unit is used for the handover trigger pulse according to described short wave channel synchronizer transmission, and the delivery channel switching command is realized the channel switching controls.
9. the synchronous handover control system of short wave channel as claimed in claim 8 is characterized in that,
Described main control unit is that the channel handoff parameter of described short wave channel synchronizer configuration comprises at least: channel residence time and channel switching instant and a nearest time interval X of whole second;
Described main control unit is that the channel handoff parameter of described channel switch unit configuration comprises at least: take the time point of certain setting as benchmark, and the corresponding relative time Tx of current time that the absolute time of utilizing standard clock source to provide converts and obtains.
10. the synchronous handover control system of short wave channel as claimed in claim 9 is characterized in that,
The mode of described main control unit configurating channel switching instant and a nearest time interval X of whole second comprises: time interval X=k*t-Tx-1; Wherein, t is the channel residence time, and k is for satisfying the smallest positive integral of X＞0;
The switching command of described channel switch unit output comprises the channel number of switching; Wherein, the account form of described channel number comprises:
Wherein, t is that channel residence time, N are the channel number.
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