CN104569965A - Method for synchronizing time and frequency of motor-driven configured bistatic radar - Google Patents
Method for synchronizing time and frequency of motor-driven configured bistatic radar Download PDFInfo
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- CN104569965A CN104569965A CN201410815703.XA CN201410815703A CN104569965A CN 104569965 A CN104569965 A CN 104569965A CN 201410815703 A CN201410815703 A CN 201410815703A CN 104569965 A CN104569965 A CN 104569965A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/003—Bistatic radar systems; Multistatic radar systems
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Abstract
The invention relates to a method for synchronizing the time and the frequency of a motor-driven configured bistatic radar. The frequency and the time between a receiving station and a transmitting station of the bistatic radar can be realized by utilizing the characteristics of long-term stability, low phase noise and low stray; when the receiving station and the transmitting station are deployed separately, the real-time statistics of time synchronization errors of the receiving station and the transmitting station are completed on the basis of pulses per second of a navigation satellite; when the time synchronization errors exceed a limit value and the state of the pulses per second of the navigation satellite is normal, time resynchronization between the receiving station and the transmitting station is completed in a navigation satellite time service synchronization mode; the receiving station and the transmitting station enter a timekeeping synchronization state again. The method is applicable to synchronizing the time and the frequency of the motor-driven configured bistatic radar, and has the advantages of short erecting and withdrawing time, high maneuverability, high working stability and the like. Before the receiving station and the transmitting station are deployed separately, the modes of direct time contrast synchronization and long-time autonomous timekeeping maintenance are adopted, and have the advantages of being not limited by the navigation satellite and not impacted by electromagnetic environment in wartime.
Description
Technical field
The invention belongs to bistatic radar technical field, be specifically related to a kind of time of motor-driven configuration bistatic radar, frequency synchronization method.
Background technology
Bistatic radar sending and receiving split, parallax range is not from thousands of rice to tens kms etc., in order to measurement target distance and the harmonious work in sending and receiving station during work, the sending and receiving station necessary retention time is synchronous, in order to can receive and amplify echoed signal, must operate at identical frequency between sending and receiving station, time and Frequency Synchronization are the cores of bistatic radar " three is same " gordian technique.
The method of employing optical fiber wire link transmission time, frequency synchronization signal has good stability, precision high, but optical fiber cable for field operation erection is removed between the time receiving long, and personnel demand amount is large, can not meet the requirement of the motor-driven deployment configuration of radar.Adopt the method for the direct wireless transmission frequency of microwave signal and time reference signal, although have good maneuverability, synchronous stability and precision are subject to the impact of the environmental factors such as landform.Utilize GPS navigation satellite to carry out the Measures compare maturation of bistatic radar time and Frequency Synchronization, but application may be restricted in wartime due to GPS, the method is applied inadvisable in military radar.The people such as Peng Fang propose a kind of bistatic radar time based on big-dipper satellite and frequency synchronization method, see " playing arrow and guidance journal " the 27th volume first phase 18-20 page in 2007, the method utilizes the satellite navigation system of China oneself to carry out time service, avoid the restriction that wartime, applying GPS synchronous method may be subject to, but the method needs the signal using Navsat continuously, causes radar Time and Frequency Synchronization go wrong and cannot use when wartime, big-dipper satellite was interfered.
Summary of the invention
The technical matters solved
In order to avoid the deficiencies in the prior art part, the present invention proposes a kind of time, frequency synchronization method of motor-driven configuration bistatic radar.
Technical scheme
The time of motor-driven configuration bistatic radar, a frequency synchronization method, is characterized in that: using receiving station and cell site as the master station and follow station of bistatic radar, and two stations all arrange output and the input interface that synchronous waves stays pulse; The time base clock of two station timing circuit is super atomic clock, and the synchronous waves arranging same period in two station timing circuit stays pulse, and as producing the time reference of other sequential; Synchronizing step is as follows:
Step 1, initial synchronisation: utilize concentric cable to be connected with the synchronizing pulse input interface of cell site by receiving station's synchronizing pulse output interface; Cell site's timing circuit is when synchronous enabled pulse is effective, and the synchronous waves exported with receiving station stays pulse for reset trigger pulse, makes ripple between sending and receiving station stay pulse sequence and obtains synchronously; Disconnect the synchronizing cable between sending and receiving station, two stations enter respective position, timing circuit auto time determination synchronous regime; Described synchronous enabled pulse is effectively for lockage button is connected;
Step 2: bistatic radar sending and receiving station arrives after respective position set up, and each subsystem powers up work, the online real-time Communication for Power set up between two stations of Wireless Telecom Equipment;
Step 3, in real time detection:
Step a: the pps pulse per second signal that the timing circuit at sending and receiving station exports with each station navigational satellite receiver respectively for triggering, measure our station from pulse per second (PPS) rising edge to follow-up first ripple rising edge in synchronizing pulse time delay;
Step b: the latency measurement data of cell site send receiving station's computer for controlling to;
Step c: the cell site's time delay value received and receiving station's time delay value are subtracted each other the time delay difference between acquisition two station by receiving station's computer for controlling;
Steps d: receiving station's computer for controlling differentiates time delay difference, rejects the time delay difference being greater than over range exceptional value, the time delay difference of normal range in a period of time is carried out statistical computation, obtains assembly average and the standard deviation of synchronous error;
Step e: when average statistical exceedes default restriction threshold value, needs to carry out synchronously; If standard deviation is less than the scope of the regulation of standard deviation, carry out next synchronizing process;
Step 4: receiving station's computer for controlling is had no progeny in response pulse per second (PPS), assigns the instruction of Navsat time service indirect synchronization by communication interface and wireless communication transmissions equipment to the timing circuit at sending and receiving station; Sending and receiving station timing circuit produces the strobe pulse of next pulse per second (PPS); Sending and receiving station timing circuit, in the strobe pulse valid period, respectively with the pulse per second (PPS) reset sending and receiving station timing sequence generating circuit that sending and receiving station navigational satellite receiver provides, completes synchronous waves and stays the subsynchronous again of pulse;
Sending and receiving two station reenters punctual synchronous state, repetitive cycling step 3 ~ step 4.
A period of time of described steps d is 10 minutes.
The over range exceptional value of described steps d is 1 delicate.
The restriction threshold value of described step e was 40 ~ 60 nanoseconds.
The scope of the regulation of the standard deviation of described step e was 20 ~ 40 nanoseconds.
Beneficial effect
The time of a kind of motor-driven configuration bistatic radar that the present invention proposes, frequency synchronization method, adopt the super atomic clock with advantages such as long steady, Low phase noise and low spurious as the clock reference of sending and receiving two station time synchronized, and realize the indirect Frequency Synchronization at sending and receiving station simultaneously, do not need to arrange optical fiber and MTL microwave transmission link between two stations, auto time determination, by the restriction of Navsat, has erection and removes the advantages such as short between the time receiving, maneuverability good, good operating stability.
The present invention compared with prior art, has following features:
1, the present invention is applicable to time, the Frequency Synchronization of the bistatic radar of motor-driven configuration, has erection and removes short between the time receiving, the advantage such as maneuverability good, good operating stability.
2, before sending and receiving station is separately disposed, the mode that when adopting direct pair, synchronous, long-time auto time determination keeps, has and does not limit by Navsat, be not subject to the advantage of electromagnetic environmental impact in wartime.
3, when sending and receiving station is separately disposed, the real-time statistics of sending and receiving station time synchronization error is completed based on Navsat pulse per second (PPS), when time synchronization error exceeds limit value, and when the state of Navsat pulse per second (PPS) is normal, adopt the method for synchronization of " Navsat time service ", the time completed between sending and receiving two station is synchronous again, reenters punctual synchronous state.
4, utilize that the length of super atomic clock is steady, Low phase noise, low spurious characteristic can realize Frequency Synchronization between bistatic radar sending and receiving station and time synchronized, when synchronous error is no more than 50ns, time synchronized can keep the most nearly about 6 days.
Accompanying drawing explanation
Fig. 1 is the composition frame chart of a kind of motor-driven configuration bistatic radar time, frequency synchronization apparatus;
Fig. 2 is " when direct pair " synchronous sequential chart;
Fig. 3 is the sequential chart that time synchronization error is added up and " Navsat time service " is synchronous.
Embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
The method of the embodiment of the present invention, it is characterized in that: sending and receiving two station timing circuit and super atomic clock circuit to be powered continuous continual work by vehicle-mounted level, super atomic clock provides the time base clock with long steady characteristic for timing circuit, has long steady, Low phase noise, low spurious characteristic frequency reference realize the indirect Frequency Synchronization at bistatic radar sending and receiving station for frequency source equipment provides.
The synchronous waves arranging same period in the timing circuit of sending and receiving two station respectively stays pulse, two other sequential of station produce by this time reference, receiving station and cell site, as the master station and follow station of bistatic radar, arrange output and input interface that synchronous waves stays pulse respectively.
Step 1: before bistatic radar sending and receiving station is separately disposed, " when direct pair " that complete sending and receiving station is synchronous.Specifically comprise the following steps:
Sub-step 11, operator uses and receiving station's synchronizing pulse output is connected with the synchronizing pulse input interface of cell site through time delay calibrated concentric cable;
Sub-step 12, cell site's timing circuit (when lockage button is pressed) when synchronous enabled pulse is effective stays pulse for reset trigger pulse with the synchronous waves that receiving station exports, and completes ripple between sending and receiving station and stays the synchronous of pulse sequence;
Sub-step 13, operator disconnects the synchronizing cable between sending and receiving station, and two station timing circuit work alone and enter long-time auto time determination synchronous regime.
Step 2: bistatic radar sending and receiving station arrives after respective position set up, and each subsystem powers up work, the online real-time Communication for Power set up between two stations of Wireless Telecom Equipment.
Step 3: receiving station's computer for controlling completes the time synchronization error real-time statistics between sending and receiving station.Concrete steps comprise:
Sub-step 31, the pps pulse per second signal that the timing circuit at sending and receiving station exports with each station navigational satellite receiver respectively for triggering, the measurement of time delay completing from pulse per second (PPS) rising edge to follow-up first ripple rising edge in synchronizing pulse;
Sub-step 32, the latency measurement data of cell site send receiving station's computer for controlling to via cell site's computer for controlling, a station Wireless Telecom Equipment, receipts station Wireless Telecom Equipment;
Sub-step 33, the cell site's time delay value received and receiving station's time delay value are subtracted each other the delay inequality between acquisition two station by receiving station's computer for controlling, and this delay inequality is the combined action of the pulse per second (PPS) inconsistency introduced by sending and receiving two station synchronizing circuit and navigation satellite signal and equipment.First receiving station's computer for controlling differentiates time delay difference, the delay inequality being greater than over range exceptional value 1 delicate is rejected, the normal range value in 10 minutes is carried out statistical computation, obtains assembly average and the standard deviation of synchronous error.
Step 4: receiving station's computer for controlling obtains average statistical according to step 3 and standard deviation judges, if average statistical exceedes default restriction threshold value 50 nanosecond, and standard deviation is within scope 30 nanosecond of regulation, show that synchronous error between two stations transfinites and the pps pulse per second signal stable performance that exports of Present navigation satellite receiver, step 5 can be proceeded to and carry out time synchronous again process.
Step 5: " Navsat time service " time that receiving station's computer for controlling control sending and receiving two station equipment completes sending and receiving two station based on the pps pulse per second signal that navigational satellite receiver exports is synchronous again, reenter punctual synchronous state, until end-of-job or next time time are synchronous again.Its concrete steps are:
Sub-step 51, receiving station's computer for controlling is had no progeny in response pulse per second (PPS), assigns the instruction of Navsat time service indirect synchronization by communication interface and wireless communication transmissions equipment to the timing circuit at sending and receiving station;
Sub-step 52, sending and receiving station timing circuit produces the strobe pulse of next pulse per second (PPS);
Sub-step 53, sending and receiving station timing circuit, in the strobe pulse valid period, respectively with the pulse per second (PPS) reset sending and receiving station timing sequence generating circuit that sending and receiving station navigational satellite receiver provides, completes the alignment again that synchronous waves stays pulse.
Fig. 1 is the embodiment composition frame chart of a kind of motor-driven configuration bistatic radar time, Frequency Synchronization scheme.Bistatic radar is made up of receiving station 1 and cell site 2 two parts, receiving station 1 is as main control station, and its main Time and Frequency Synchronization equipment comprises Wireless Telecom Equipment 101, navigational satellite receiver 102, receiving station's computer for controlling 103, super atomic clock 104, receiving station's timing circuit 105, receiving station's frequency source 106 form; The main component devices of cell site 2 comprises Wireless Telecom Equipment 201, navigational satellite receiver 202, cell site's computer for controlling 203, the super atomic clock 204 in cell site, cell site's timing circuit 205, cell site's frequency source 206 form.The Wireless Telecom Equipment 101 and 201 at sending and receiving station, for the synchronous communication between sending and receiving station, completes receiving station and assigns and the state reporting of cell site to receiving station to the steering order of cell site; Sending and receiving station navigational satellite receiver 102 and 202 completes Differential positioning and the time service at sending and receiving station; The computer for controlling 103 and 203 at sending and receiving station completes the controlling functions of receiving station and cell site's major equipment respectively, realizes the harmonious work at radar sending and receiving station; The super atomic clock 104 and 204 at sending and receiving station mainly completes 100MHz reference frequency signal and produces and pulse per second (PPS) output function; The timing circuit 104 and 204 at sending and receiving station according to the order of computer for controlling, the functions such as the generation of completion system work schedule, time synchronization error statistics and time synchronized; The frequency source 106 and 206 at sending and receiving station produces local oscillation signal needed for bistatic radar work and rf excitation signal according to the frequency reference that super atomic clock provides.
Fig. 2 is the sequential chart of " when direct pair " time synchronized, impact is brought for ensureing that the repetition period irregular conversion at sending and receiving two station does not harmoniously work to sending and receiving station, it is that the synchronous waves of 10ms stays pulse sequence that sending and receiving station arranges the fixed cycle, and the timing circuit at two stations stays the pulse work schedule pulse respective for time reference produces with this synchronous waves respectively.When carrying out " when direct pair " and being synchronous, receiving station export pair time synchronizing pulse send into the systematic synchronous circuit of cell site via cable, the time delay that cable brings can carry out the timing tracking accuracy demarcating to guarantee sending and receiving station, cell site's panel can arrange lockage button, it is effective that synchronous enabled pulse pressed by button, cell site's timing generation circuit to reset clearing counting circuit with synchronizing pulse during the receiving station pair of input, generation and receiving station's synchronous waves are stayed the synchronous synchronous waves of signal and are stayed pulse, complete the time synchronized between sending and receiving station.
Fig. 3 is the sequential chart that synchronous error is added up and " Navsat time service " is synchronous, receive, send out the time interval that pulse per second (PPS) that two station timing plates 105 and the 205 pairs of navigational satellite receivers 102 and 202 provide and its follow-up first ripple stay pulse and carry out statistics acquisition T1 and T2 two values, a time interval T2 at station is sent to the computer for controlling of receiving station by cell site's computer for controlling via wireless communication link, T1 and T2 is subtracted each other real-time statistics is carried out to the time synchronization error at two stations, when time synchronization error mean value exceeds defined threshold, show that the range measurement accuracy of radar has exceeded the limit of regulation, needs re-start synchronous again, and when the standard deviation of time synchronization error is within specialized range, show that Present navigation satellite receiver exports the in stable condition of pulse per second (PPS), " Navsat time service " can be carried out synchronous." Navsat time service " time again the method for synchronization be mainly used in bistatic radar receive, send out station when separately disposing, receive station computer for controlling 103 and first open pulse per second (PPS) interruption, have no progeny receiving in pulse per second (PPS), " Navsat time service " synchronic command is sent to sending out station computer for controlling via Wireless Telecom Equipment 101 and 201, common about fix on next pulse per second (PPS) and jointly to reset receipts, send out the timing system at two stations, receive, send out station timing circuit and produce a pulse per second (PPS) gating signal respectively, the next pps pulse per second signal of gating is as the synchronous reset pulse of timing sequence generating circuit, realize receiving, the time sending out two stations is subsynchronous again.
Specific embodiment:
Step 1: the super atomic clock 104 and 204 of receiving station and cell site, timing circuit 105 and 205 is powered by vehicular electricity storage bottle, continuous continual work; The super atomic clock in sending and receiving station provides the time base clock with long steady characteristic for timing circuit, keeps time synchronously to realize the long-time of two station clock signals; For sending and receiving station frequency source 106 and 206 provides, length is steady, the frequency reference of Low phase noise, low spurious characteristic, realizes the indirect Frequency Synchronization at two stations.
Step 2: before sending and receiving station is separately disposed, operator synchronizing cable receiving station's timing circuit 104 is exported pair time synchronizing pulse send the timing circuit 204 of cell site to, after cell site's control panel presses lockage button, the synchronizing pulse of timing plate 205 gating receiving station of cell site input, cell site's timing sequence generating circuit resets with this synchronizing pulse and resets counting circuit, regenerate the various timing control signals required for cell site's work, complete " pair time synchronous " at sending and receiving station.
Step 3: bistatic radar sending and receiving station arrives after respective position set up, and each subsystem powers up work, the online real-time Communication for Power set up between two stations of Wireless Telecom Equipment 101 and 201.
Step 4: receiving station's computer for controlling 103 controls sending and receiving station equipment and completes time synchronization error real-time statistics between two stations, detailed process is: the pps pulse per second signal that the timing plate 105 and 205 at sending and receiving station exports with each station navigational satellite receiver 101 and 201 is respectively for triggering, the measurement of time delay completing from pulse per second (PPS) rising edge to follow-up first ripple rising edge in synchronizing pulse, and report the computer for controlling at each station; The cell site's time delay value received and receiving station time delay value are subtracted each other the synchronous time difference between acquisition two station by receiving station's computer for controlling (103), after rejecting abnormalities value, statistical computation is carried out to measurement data, obtain mean value and the standard deviation of time synchronization error.
Step 5: the assembly average of the two station time synchronization errors that receiving station's computer for controlling 103 obtains according to step 4 and standard deviation judge, if assembly average exceedes the threshold value of default restriction, and standard deviation is within the scope of regulation, show that synchronous error between two stations transfinites and the pps pulse per second signal that exports of Present navigation satellite receiver 102 and 202 is reliable and stable, step 6 can be proceeded to and carry out time synchronous again process.
Step 6: have no progeny initiation " Navsat time service " synchronously by receiving station's computer for controlling 103 in response pulse per second (PPS), synch command is sent to via sending and receiving station Wireless Telecom Equipment 101 and 201 and sends out station computer for controlling 203, about fix on the timing sequence generating circuit at reset sending and receiving two station jointly when next pulse per second (PPS) arrives, sending and receiving station timing sequence generating circuit produces the strobe pulse of next pulse per second (PPS), to prevent the impact of undesired signal; In the strobe pulse valid period, sending and receiving station timing circuit 105 and 205 is respectively with the pulse per second (PPS) reset sending and receiving station timing circuit that sending and receiving station navigational satellite receiver 102 and 202 provides, complete the alignment again that synchronous waves stays pulse, radar reenters punctual synchronous state, until end-of-job or next time time are synchronous again.
Claims (5)
1. time of motor-driven configuration bistatic radar, a frequency synchronization method, is characterized in that: using receiving station and cell site as the master station and follow station of bistatic radar, and two stations all arrange output and the input interface that synchronous waves stays pulse; The time base clock of two station timing circuit is super atomic clock, and the synchronous waves arranging same period in two station timing circuit stays pulse, and as producing the time reference of other sequential; Synchronizing step is as follows:
Step 1, initial synchronisation: utilize concentric cable to be connected with the synchronizing pulse input interface of cell site by receiving station's synchronizing pulse output interface; Cell site's timing circuit is when synchronous enabled pulse is effective, and the synchronous waves exported with receiving station stays pulse for reset trigger pulse, makes ripple between sending and receiving station stay pulse sequence and obtains synchronously; Disconnect the synchronizing cable between sending and receiving station, two stations enter respective position, timing circuit auto time determination synchronous regime; Described synchronous enabled pulse is effectively for lockage button is connected;
Step 2: bistatic radar sending and receiving station arrives after respective position set up, and each subsystem powers up work, the online real-time Communication for Power set up between two stations of Wireless Telecom Equipment;
Step 3, in real time detection:
Step a: the pps pulse per second signal that the timing circuit at sending and receiving station exports with each station navigational satellite receiver respectively for triggering, measure our station from pulse per second (PPS) rising edge to follow-up first ripple rising edge in synchronizing pulse time delay;
Step b: the latency measurement data of cell site send receiving station's computer for controlling to;
Step c: the cell site's time delay value received and receiving station's time delay value are subtracted each other the time delay difference between acquisition two station by receiving station's computer for controlling;
Steps d: receiving station's computer for controlling differentiates time delay difference, rejects the time delay difference being greater than over range exceptional value, the time delay difference of normal range in a period of time is carried out statistical computation, obtains assembly average and the standard deviation of synchronous error;
Step e: when average statistical exceedes default restriction threshold value, needs to carry out synchronously; If standard deviation is less than the scope of the regulation of standard deviation, carry out next synchronizing process;
Step 4: receiving station's computer for controlling is had no progeny in response pulse per second (PPS), assigns the instruction of Navsat time service indirect synchronization by communication interface and wireless communication transmissions equipment to the timing circuit at sending and receiving station; Sending and receiving station timing circuit produces the strobe pulse of next pulse per second (PPS); Sending and receiving station timing circuit, in the strobe pulse valid period, respectively with the pulse per second (PPS) reset sending and receiving station timing sequence generating circuit that sending and receiving station navigational satellite receiver provides, completes synchronous waves and stays the subsynchronous again of pulse;
Sending and receiving two station reenters punctual synchronous state, repetitive cycling step 3 ~ step 4.
2. time of motor-driven configuration bistatic radar, frequency synchronization method according to claim 1, is characterized in that:
A period of time of described steps d is 10 minutes.
3. time of motor-driven configuration bistatic radar, frequency synchronization method according to claim 1, is characterized in that:
The over range exceptional value of described steps d is 1 delicate.
4. time of motor-driven configuration bistatic radar, frequency synchronization method according to claim 1, is characterized in that:
The restriction threshold value of described step e was 40 ~ 60 nanoseconds.
5. time of motor-driven configuration bistatic radar, frequency synchronization method according to claim 1, is characterized in that:
The scope of the regulation of the standard deviation of described step e was 20 ~ 40 nanoseconds.
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