CN104569965B - 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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- CN104569965B CN104569965B CN201410815703.XA CN201410815703A CN104569965B CN 104569965 B CN104569965 B CN 104569965B CN 201410815703 A CN201410815703 A CN 201410815703A CN 104569965 B CN104569965 B CN 104569965B
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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 is and in particular to a kind of time of motor-driven configuration bistatic radar, frequently
Rate synchronous method.
Background technology
Bistatic radar sending and receiving split, parallax range from thousands of rice to tens kms, in order to measure target during work
Distance and the harmonious work in sending and receiving station, the sending and receiving station necessary retention time is synchronous, in order to be able to receiving and amplifying echo-signal,
Identical frequency is must operate at, time and Frequency Synchronization are the cores of bistatic radar " three with " key technology between sending and receiving station.
Method using optical fiber wire link transmission time, frequency synchronization signal has the features such as good stability, high precision,
But optical fiber cable for field operation set up remove long between the time receiving, personnel demand amount big it is impossible to meet the requirement of the motor-driven deployment configuration of radar.Using microwave
The method of signal direct wireless transmission frequency and time reference signal is although have preferable mobility, but the stability of synchronization
Easily affected by environmental factors such as landform with precision.Carry out bistatic radar time and Frequency Synchronization using GPS navigation satellite
Method comparative maturity, but due to GPS, in wartime, application may be restricted, and the method is applied inadvisable in military radar.
Peng Fang et al. proposes a kind of bistatic radar time based on big-dipper satellite and frequency synchronization method, sees《Play arrow to learn with guidance
Report》The 18-20 page of the first phase of volume 27 in 2007, the method carries out time service using the satellite navigation system of China oneself, it is to avoid
Wartime application GPS synchronous method may be by being limited, but the method needs continuously to use the signal of aeronautical satellite, in war
When big-dipper satellite be interfered in the case of lead to radar Time and Frequency Synchronization to go wrong and cannot use.
Content of the invention
Technical problem to be solved
In place of the deficiencies in the prior art, the present invention proposes a kind of time of motor-driven configuration bistatic radar, frequently
Rate synchronous method.
Technical scheme
A kind of time of motor-driven configuration bistatic radar, frequency synchronization method it is characterised in that：With receiving station and cell site
Main website as bistatic radar and slave station, two stations are respectively provided with output and the input interface that synchronous waves stays pulse；Two station systems are fixed
When circuit time base clock be super atomic clock, in two station timing circuit arrange same period synchronous waves stay arteries and veins
Punching, and the time reference as the other sequential of generation；Synchronizing step is as follows：
Step 1, initial synchronisation：Using coaxial cable by the lock-out pulse of receiving station's lock-out pulse output interface and cell site
Input interface connects；Cell site's timing circuit, when synchronous enabled pulse is effective, stays arteries and veins with the synchronous waves of receiving station's output
Rush as reset trigger pulse so that ripple obtains synchronization in pulse sequence between sending and receiving station；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 lockage button
Connect；
Step 2：After the completion of bistatic radar sending and receiving station reaches the erection of respective position, each subsystem powers up work, channel radio
The online real-time Communication for Power set up between two stations of letter equipment；
Step 3, real-time detection：
Step a：The timing circuit at sending and receiving station respectively with each station navigational satellite receiver output pps pulse per second signal be
Triggering, measures time delay from pulse per second (PPS) rising edge to follow-up first ripple rising edge in lock-out pulse for the our station；
Step b：The latency measurement data of cell site sends receiving station's control computer to；
Step c：The cell site receiving time delay value and receiving station's time delay value are subtracted each other acquisition two by receiving station's control computer
Time delay difference between standing；
Step d：Receiving station's control computer differentiates to time delay difference, rejects the delay inequality more than over range exceptional value
Value, the time delay difference of normal range (NR) in a period of time is carried out statistical computation, obtains assembly average and the standard of synchronous error
Difference；
Step e：When average statistical exceedes default restriction threshold value, need to synchronize；If standard deviation is less than standard deviation
Regulation scope, carry out next synchronizing process；
Step 4：Receiving station's control computer is had no progeny in response pulse per second (PPS), is set by communication interface and wireless communication transmissions
The standby timing circuit to sending and receiving station assigns the instruction of aeronautical satellite time service indirect synchronization；Sending and receiving station timing circuit produces
The gate pulse of next pulse per second (PPS)；Sending and receiving station timing circuit, in the gate pulse valid period, is led with sending and receiving station respectively
The pulse per second (PPS) reset sending and receiving station timing sequence generating circuit that boat DVB provides, completes synchronous waves and stays the subsynchronous again of pulse；
Sending and receiving two station reenters the state of punctual synchronization, repetitive cycling step 3～step 4.
A period of time of described step d is 10 minutes.
The over range exceptional value of described step d is delicate for 1.
Described step e limit threshold value as 40～60 nanoseconds.
The scope of the regulation of the standard deviation of described step e was 20～40 nanoseconds.
Beneficial effect
A kind of time of motor-driven configuration bistatic radar proposed by the present invention, frequency synchronization method, using having, length is steady, low
Mutually make an uproar and super atomic clock the advantages of low spurious is as the clock reference of sending and receiving two station time synchronized, and realize sending and receiving simultaneously
The indirect Frequency Synchronization stood, is not required between two stations arrange optical fiber and MTL microwave transmission link, auto time determination is not limited by aeronautical satellite,
Have the advantages that erection removes that short between the time receiving, mobility is good, good operating stability.
The present invention compared with prior art, has following features：
1st, the present invention is applied to the time of the bistatic radar of motor-driven configuration, Frequency Synchronization, have erection remove short between the time receiving,
Mobility is good, good operating stability the advantages of.
2nd, before sending and receiving station is separately disposed, by the way of when direct pair, synchronous, long-time auto time determination keeps, have not
Limited by aeronautical satellite, the advantage not being subject to wartime electromagnetic environmental impact.
3rd, the real-time system of sending and receiving station time synchronization error when sending and receiving station is separately disposed, is completed based on aeronautical satellite pulse per second (PPS)
Meter, when time synchronization error exceeds limit value, and aeronautical satellite pulse per second (PPS) state normal when, using " aeronautical satellite is awarded
When " the method for synchronization, complete the time resynchronisation between sending and receiving two station, reenter the state of punctual synchronization.
4th, the length utilizing super atomic clock is steady, Low phase noise, low spurious characteristic can achieve the frequency between bistatic radar sending and receiving station
Rate synchronization and time synchronized, when synchronous error is less than 50ns, time synchronized can hold up to and reach 6 days about.
Brief description
Fig. 1 is a kind of motor-driven configuration bistatic radar time, the composition frame chart of frequency synchronization apparatus；
Fig. 2 is " when direct pair " synchronous sequential chart；
Fig. 3 is the sequential chart of time synchronization error statistics and " aeronautical satellite time service " synchronization.
Specific embodiment
In conjunction with embodiment, accompanying drawing, the invention will be further described：
The method of the embodiment of the present invention it is characterised in that：Sending and receiving two station timing circuit and super atomic clock circuit by
Vehicle-mounted level is powered continuously continual work, and super atomic clock provides the timing base with long steady characteristic for timing circuit
Punctual clock, provide for frequency source device have long steady, Low phase noise, low spurious characteristic frequency reference realize bistatic radar receive,
Send out the indirect Frequency Synchronization at station.
The synchronous waves being respectively provided with same period in sending and receiving two station timing circuit stays pulse, and two station other sequential are equal
Produced by this time reference, receiving station and cell site, as the main website of bistatic radar and slave station, are respectively provided with synchronous waves and stay arteries and veins
The output of punching and input interface.
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, manipulator and launches receiving station's lock-out pulse output using through the calibrated coaxial cable of time delay
The lock-out pulse input interface stood connects；
Sub-step 12, cell site's timing circuit when synchronous enabled pulse is effective (when lockage button is pressed) with receive
It is reset trigger pulse that the synchronous waves exporting of standing stays pulse, completes the synchronization that ripple between sending and receiving station stays pulse sequence；
Sub-step 13, manipulator disconnects the synchronizing cable between sending and receiving station, and two station timing circuit work independently and enter length
Time auto time determination synchronous regime.
Step 2：After the completion of bistatic radar sending and receiving station reaches the erection of respective position, each subsystem powers up work, channel radio
The online real-time Communication for Power set up between two stations of letter equipment.
Step 3：Receiving station's control computer completes the time synchronization error real-time statistics between sending and receiving station.Concrete steps bag
Include：
Sub-step 31, the timing circuit at sending and receiving station is respectively with the pulse per second (PPS) letter of each station navigational satellite receiver output
Number for triggering, complete the measurement of time delay from pulse per second (PPS) rising edge to follow-up first ripple rising edge in lock-out pulse；
Sub-step 32, the latency measurement data of cell site is via cell site's control computer, station Wireless Telecom Equipment, receipts
Wireless Telecom Equipment of standing sends receiving station's control computer to；
Sub-step 33, the cell site receiving time delay value and receiving station's time delay value are subtracted each other acquisition by receiving station's control computer
Delay inequality between two stations, this delay inequality is the pulse per second (PPS) being introduced by sending and receiving two station synchronous circuit and navigation satellite signal and equipment
The comprehensive function of inconsistency.Receiving station's control computer differentiates to time delay difference first, will be greater than over range exceptional value 1
Delicate delay inequality is rejected, and the normal range value in 10 minutes is carried out statistical computation, and the statistics obtaining synchronous error is put down
Average and standard deviation.
Step 4：Receiving station's control computer obtains average statistical according to step 3 and standard deviation is judged, if statistics is all
Value exceedes default restriction threshold value 50 nanosecond, and standard deviation, within scope 30 nanosecond of regulation, shows synchronous error between two stations
Transfinite and Present navigation DVB output pps pulse per second signal stable performance, can proceed to step 5 carry out the time again with
The process of step.
Step 5：Receiving station's control computer controls the pulse per second (PPS) that sending and receiving two station equipment is exported based on navigational satellite receiver
Signal completes " aeronautical satellite time service " the time resynchronisation at sending and receiving two station, reenters the state of punctual synchronization, until work knot
Bundle or next time time resynchronisation.It concretely comprises the following steps：
Sub-step 51, receiving station's control computer is had no progeny in response pulse per second (PPS), is passed by communication interface and radio communication
Transfer device assigns the instruction of aeronautical satellite time service indirect synchronization to the timing circuit at sending and receiving station；
Sub-step 52, sending and receiving station timing circuit produces the gate pulse of next pulse per second (PPS)；
Sub-step 53, sending and receiving station timing circuit in the gate pulse valid period, respectively with sending and receiving station aeronautical satellite
The pulse per second (PPS) reset sending and receiving station timing sequence generating circuit that receiver provides, completes the alignment again that synchronous waves stays pulse.
Fig. 1 is a kind of motor-driven configuration bistatic radar time, the embodiment composition frame chart of Frequency Synchronization scheme.Double-basis land mine
Reach and be made up of receiving station 1 and cell site 2 two parts, as main control station, its main Time and Frequency Synchronization equipment includes wirelessly for receiving station 1
Communication equipment 101, navigational satellite receiver 102, receiving station's control computer 103, super atomic clock 104, receiving station's system are fixed
When circuit 105, receiving station's frequency source 106 form；The main component devices of cell site 2 include Wireless Telecom Equipment 201, navigation is defended
Star receiver 202, cell site's control computer 203, the super atomic clock in cell site 204, cell site's timing circuit 205, send out
Penetrate station frequency source 206 to form.The Wireless Telecom Equipment 101 and 201 at sending and receiving station is used for the synchronous communication between sending and receiving station, completes to connect
The control instruction receiving station to cell site assigns the state reporting to receiving station with cell site；Sending and receiving station navigational satellite receiver 102
The Differential positioning completing sending and receiving station with 202 and time service；The control computer 103 and 203 at sending and receiving station be respectively completed receiving station and
The control function of cell site's capital equipment, realizes the harmonious work at radar sending and receiving station；The super atomic clock 104 at sending and receiving station
Mainly complete 100MHz reference frequency signal with 204 to produce and pulse per second (PPS) output function；The timing circuit 104 at sending and receiving station
With the order of 204 foundation control computers, the generation of completion system work schedule, time synchronization error statistics and time synchronized etc.
Function；The frequency source 106 and 206 at sending and receiving station produces bistatic radar work institute according to the frequency reference that super atomic clock provides
The local oscillation signal needing and rf excitation signal.
Fig. 2 is the sequential chart of " when direct pair " time synchronized, and the repetition period irregular conversion for ensureing sending and receiving two station is not given
Harmoniously work brings impact at sending and receiving station, and sending and receiving station arranges the synchronous waves that the fixed cycle is 10ms and stays pulse sequence, two stations
Timing circuit respectively with this synchronous waves stay pulse for time reference produce respective work schedule pulse.Entering
When row " when direct pair " is synchronous, receiving station's output pair when lock-out pulse send into the systematic synchronous circuit of cell site via cable,
The time delay that cable brings can be demarcated to guarantee the timing tracking accuracy at sending and receiving station, and cell site's panel can arrange synchronous pressing
Button, button presses synchronous enabled pulse effectively, cell site's timing generation circuit with input receiving station pair when lock-out pulse reflex
Position clearing counting circuit, generates and the synchronous waves of receiving station's synchronous waves synchronization in signal stays pulse, completes the time between sending and receiving station
Synchronous.
Fig. 3 is the sequential chart of synchronous error statistics and " aeronautical satellite time service " synchronization, sending and receiving two station timing plate 105
The pulse per second (PPS) providing with 205 pairs of navigational satellite receivers 102 and 202 and its follow-up first ripple are carried out in the time interval of pulse
Statistics obtains two values of T1 and T2, and time interval T2 sending out station is sent to by cell site's control computer via wireless communication link
The control computer of receiving station, T1 and T2 is subtracted each other the time synchronization error to two stations and carries out real-time statistics, when time synchronized is missed
When difference mean value exceeds defined threshold, show that the range measurement accuracy of radar has exceeded the limit of regulation, need to re-start
Resynchronisation, and when the standard deviation of time synchronization error is within prescribed limit, show that Present navigation DVB exports
Pulse per second (PPS) in stable condition, " aeronautical satellite time service " can be carried out synchronous." aeronautical satellite time service " time resynchronisation mode is main
When separately disposing for bistatic radar sending and receiving station, receive stand control computer 103 and first open pulse per second (PPS) interruption, receiving pulse per second (PPS)
In have no progeny, send " aeronautical satellite time service " synchronic command to sending out a stand control computer via Wireless Telecom Equipment 101 and 201, altogether
With the timing system being about scheduled on next pulse per second (PPS) reset sending and receiving two station jointly, sending and receiving station timing circuit produces one respectively
Individual pulse per second (PPS) gating signal, the next pps pulse per second signal of gating, as the synchronous reset pulse of timing sequence generating circuit, realizes sending and receiving
The time at 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 by vehicle-mounted storage
Storage battery is powered, continuously continual work；The super atomic clock in sending and receiving station provides the meter with long steady characteristic for timing circuit
When reference clock, synchronous to realize keeping time for a long time of two station clock signals；There is provided length for sending and receiving station frequency source 106 and 206
Surely, Low phase noise, the frequency reference of low spurious characteristic, realizes the indirect Frequency Synchronization at two stations.
Step 2：Before sending and receiving station is separately disposed, receiving station's timing circuit 104 is exported by manipulator with synchronizing cable
Pair when lock-out pulse send the timing circuit 204 of cell site to, after cell site's control panel presses lockage button, send out
Penetrate the lock-out pulse that station timing plate 205 gates receiving station's input, cell site's timing sequence generating circuit is resetted with this lock-out pulse
Reset counting circuit, regenerate cell site work required for various timing control signals, complete sending and receiving station " pair when with
Step ".
Step 3：After the completion of bistatic radar sending and receiving station reaches the erection of respective position, each subsystem powers up work, channel radio
The online real-time Communication for Power set up between two stations of letter equipment 101 and 201.
Step 4：Receiving station's control computer 103 controls the time synchronization error that sending and receiving station equipment completes between two stations real-time
Count, detailed process is：The timing plate 105 and 205 at sending and receiving station is defeated with each station navigational satellite receiver 101 and 201 respectively
The pps pulse per second signal going out is triggering, completes time delay from pulse per second (PPS) rising edge to follow-up first ripple rising edge in lock-out pulse
Measurement, and report the control computer at each station；Receiving station's control computer (103) by the cell site receiving time delay value with connect
Receive station time delay value and subtract each other the synchronous time difference obtaining between two stations, after rejecting abnormalities value, statistical computation is carried out to measurement data, during acquisition
Between the mean value of synchronous error and standard deviation.
Step 5：The assembly average of the two station time synchronization errors that receiving station's control computer 103 obtains according to step 4
Judged with standard deviation, if assembly average exceedes the threshold value of default restriction, and standard deviation regulation within the scope of, table
Between bright two stations, synchronous error transfinites and the pps pulse per second signal of Present navigation DVB 102 and 202 output is reliable and stable, can
To proceed to the process that step 6 carries out time resynchronisation.
Step 6：Initiation " aeronautical satellite time service " is had no progeny synchronously in response pulse per second (PPS) by receiving station's control computer 103,
Synch command is sent to via sending and receiving station Wireless Telecom Equipment 101 and 201 and sends out stand control computer 203, be about scheduled on the next one
The timing sequence generating circuit at common reset sending and receiving two station when pulse per second (PPS) arrives, sending and receiving station timing sequence generating circuit produces next second arteries and veins
The gate pulse of punching, to prevent the impact of interference signal；In gate pulse valid period, sending and receiving station timing circuit 105 He
The 205 pulse per second (PPS) reset sending and receiving station timing circuit being provided with sending and receiving station navigational satellite receiver 102 and 202 respectively, complete
Become synchronous waves to stay the alignment again of pulse, radar reenters the state of punctual synchronization, until end-of-job or next time when
Between resynchronize.
Claims (5)
1. a kind of time of motor-driven configuration bistatic radar, frequency synchronization method it is characterised in that：Made with receiving station and cell site
Main website for bistatic radar and slave station, two stations are respectively provided with output and the input interface of beams simultaneously standing current pulse；Two station systems
The time base clock of timing circuit is super atomic clock, and the beams simultaneously arranging same period in two station timing circuit is stayed
Stream pulse, and the time reference as the other sequential of generation；Synchronizing step is as follows：
Step 1, initial synchronisation：Using coaxial cable by the synchronization of receiving station's beams simultaneously standing current pulse output interface and cell site
Pulse input interface connects；Cell site's timing circuit when synchronous enabled pulse is effective, with receiving station output synchronous waves
Bundle standing current pulse be reset trigger pulse so that between sending and receiving station beams simultaneously standing current pulse sequence obtain synchronization；Disconnection receipts,
Send out the synchronizing cable between station, two stations enter respective position, timing circuit auto time determination synchronous regime；Described synchronous enabled arteries and veins
Punching is effectively connected for lockage button；
Step 2：After the completion of bistatic radar sending and receiving station reaches the erection of respective position, each subsystem powers up work, and radio communication sets
The standby online real-time Communication for Power set up between two stations；
Step 3, real-time detection：
Step a：The pps pulse per second signal that the timing circuit at sending and receiving station is exported with each station navigational satellite receiver respectively is tactile
Send out, measure time delay from pulse per second (PPS) rising edge to follow-up first beams simultaneously standing current rising edge of a pulse for the our station；
Step b：The latency measurement data of cell site sends receiving station's control computer to；
Step c：Receiving station's control computer subtracts each other the cell site receiving time delay value and receiving station's time delay value between acquisition two stations
Time delay difference；
Step d：Receiving station's control computer differentiates to time delay difference, rejects the time delay difference more than over range exceptional value,
The time delay difference of normal range (NR) 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, need to synchronize；If standard deviation is less than the rule of standard deviation
Fixed scope, carries out next synchronizing process；
Step 4：Receiving station's control computer is had no progeny in response pulse per second (PPS), is given by communication interface and wireless communication transmissions equipment
The timing circuit at sending and receiving station assigns the instruction of aeronautical satellite time service indirect synchronization；Sending and receiving station timing circuit produces next
The gate pulse of individual pulse per second (PPS)；Sending and receiving station timing circuit, in the gate pulse valid period, is defended with the navigation of sending and receiving station respectively
The pulse per second (PPS) reset sending and receiving station timing sequence generating circuit that star receiver provides, completes the subsynchronous again of beams simultaneously standing current pulse；
Sending and receiving two station reenters the state of punctual synchronization, repetitive cycling step 3～step 4.
2. according to claim 1 the time of motor-driven configuration bistatic radar, frequency synchronization method it is characterised in that：
A period of time of described step d is 10 minutes.
3. according to claim 1 the time of motor-driven configuration bistatic radar, frequency synchronization method it is characterised in that：
The over range exceptional value of described step d is 1 microsecond.
4. according to claim 1 the time of motor-driven configuration bistatic radar, frequency synchronization method it is characterised in that：
Described step e limit threshold value as 40～60 nanoseconds.
5. according to claim 1 the time of motor-driven configuration bistatic radar, frequency synchronization method it is characterised in that：
The scope of the regulation of the standard deviation of described step e was 20～40 nanoseconds.
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| CN104950304B (en) * | 2015-06-17 | 2017-12-22 | 新疆新朗迪科技发展有限责任公司 | A kind of pivot plow ploughs deep measuring system and method |
| US10641881B2 (en) | 2015-08-28 | 2020-05-05 | Aptiv Technologies Limited | Bi-static radar system |
| CN106526582B (en) * | 2015-08-28 | 2022-10-04 | 安波福技术有限公司 | Double base Radar system |
| CN109116357B (en) * | 2017-06-26 | 2020-12-11 | 百度在线网络技术（北京）有限公司 | Method, device and server for synchronizing time |
| CN107843773A (en) * | 2017-10-24 | 2018-03-27 | 中国电子科技集团公司第二十研究所 | The measurement method of pulse per second (PPS) precision |
| CN108089160B (en) * | 2017-12-08 | 2020-01-17 | 郑州轻工业学院 | High-precision bistatic radar time synchronization detection system and detection method |
| CN108919633B (en) * | 2018-07-21 | 2021-04-16 | 中国人民解放军91388部队 | Synchronous time service method for ultra-low power consumption time unified module |
| CN111181713A (en) * | 2020-01-06 | 2020-05-19 | 江南大学 | Event trigger control method and device and chaotic secret communication system |
| CN111693973B (en) * | 2020-05-25 | 2022-10-14 | 北京理工大学 | Distributed system frequency synchronization method based on frequency ratio bidirectional transmission |
| CN113472417B (en) * | 2021-04-06 | 2023-02-03 | 中国科学院空天信息创新研究院 | Radar timing synchronization method, device, equipment and storage medium for multi-satellite formation |
| CN114994727B (en) * | 2022-07-18 | 2022-12-02 | 成都迅翼卫通科技有限公司 | Equipment for realizing high-precision time calibration and satellite positioning |
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| JP2623969B2 (en) * | 1990-11-30 | 1997-06-25 | 日本電気株式会社 | Radar equipment |
| US5471211A (en) * | 1993-11-30 | 1995-11-28 | University Corporation For Atmospheric Research | Receiver antenna for bistatic doppler radar network |
| US6456229B2 (en) * | 1999-12-13 | 2002-09-24 | University Corporation For Atmospheric Research | Bistatic radar network having incoherent transmitter operating in a scanning mode to identify scatterers |
| CN201503494U (en) * | 2009-09-28 | 2010-06-09 | 武汉大学 | Multi-base radar synchronizing device |
| CN102193497A (en) * | 2010-03-05 | 2011-09-21 | 中国科学院电子学研究所 | Method for realizing multi-source data accurate time alignment by utilizing PPS (Pulse Per Second) signal of GPS (Global Positioning System) |
| CN102981162B (en) * | 2012-12-11 | 2014-07-09 | 电子科技大学 | Spatial synchronization device and synchronization method for bistatic SAR |
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