CN109164467A - It is a kind of that method is maintained based on the star-loaded optical remote sensing device imaging time precision broadcasted on star - Google Patents
It is a kind of that method is maintained based on the star-loaded optical remote sensing device imaging time precision broadcasted on star Download PDFInfo
- Publication number
- CN109164467A CN109164467A CN201810777999.9A CN201810777999A CN109164467A CN 109164467 A CN109164467 A CN 109164467A CN 201810777999 A CN201810777999 A CN 201810777999A CN 109164467 A CN109164467 A CN 109164467A
- Authority
- CN
- China
- Prior art keywords
- pulse
- gps
- star
- pps
- signal processing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003384 imaging method Methods 0.000 title claims abstract description 33
- 230000003287 optical effect Effects 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 30
- 230000002123 temporal effect Effects 0.000 claims description 17
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 230000000630 rising effect Effects 0.000 claims description 6
- 238000012512 characterization method Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 210000001367 artery Anatomy 0.000 claims 1
- 230000005611 electricity Effects 0.000 claims 1
- 238000004080 punching Methods 0.000 claims 1
- 210000003462 vein Anatomy 0.000 claims 1
- 238000007726 management method Methods 0.000 abstract 4
- 238000013523 data management Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005574 cross-species transmission Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
Classifications
-
- 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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C11/00—Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
- G01C11/02—Picture taking arrangements specially adapted for photogrammetry or photographic surveying, e.g. controlling overlapping of pictures
-
- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
- G04R20/04—Tuning or receiving; Circuits therefor
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Navigation (AREA)
Abstract
一种基于星上广播的星载光学遥感器成像时间精度维持方法，方法依托星上的管理控制单元、信号处理单元通过下述方式实现：管理控制单元同时接收卫星数管分系统通过卫星总线发来的广播时间信息以及GPS接收机通过RS422接口发送的整秒时刻脉冲；管理控制单元同时对接收的广播时间信息及整秒时刻脉冲进行处理：对整秒时刻脉冲信号进行整形、驱动产生GPS秒脉冲并转发至信号处理单元；向信号处理单元转发广播时间信息以及根据广播时间信息通过中断方式生成内部秒脉冲后转发至信号处理单元；信号处理单元接收管理控制单元发送的GPS秒脉冲、内部秒脉冲以及广播时间信息；当GPS秒脉冲正常时，使用GPS秒脉冲；GPS秒脉冲中断时，使用内部秒脉冲，以实现星载光学遥感器成像时间精度维持。
A method for maintaining the imaging time accuracy of an on-board optical remote sensor based on on-board broadcasting, the method is implemented by means of a management control unit and a signal processing unit on the satellite in the following manner: the management and control unit simultaneously receives the satellite data management sub-system and transmits it through a satellite bus. The received broadcast time information and the whole second time pulse sent by the GPS receiver through the RS422 interface; the management control unit simultaneously processes the received broadcast time information and the whole second time pulse: the whole second time pulse signal is shaped and driven to generate GPS seconds. The pulse is forwarded to the signal processing unit; the broadcast time information is forwarded to the signal processing unit, and the internal second pulse is generated by interrupting according to the broadcast time information, and then forwarded to the signal processing unit; the signal processing unit receives the GPS second pulse, the internal second pulse sent by the management control unit Pulse and broadcast time information; when the GPS second pulse is normal, the GPS second pulse is used; when the GPS second pulse is interrupted, the internal second pulse is used to maintain the imaging time accuracy of the spaceborne optical remote sensor.
Description
Technical field
Method is maintained based on the star-loaded optical remote sensing device imaging time precision broadcasted on star the present invention relates to a kind of, can be applied
In star-loaded optical remote sensing device master-plan field.
Background technique
Remote sensing satellite time dissemination system is divided into two large divisions, time transmitting portion and time receiving portion.Transmitting portion is general
It is made of satellite number pipe computer and GPS receiver, is mainly responsible for the sending of time-ofday signals and corresponding temporal information.Receiving portion
It is made of star-loaded optical remote sensing device, is mainly responsible for the whole moment second pulse signal and temporal information that will be received and is combined processing,
Time data are incorporated into image data, it is ensured that the accuracy and consistency of obtained time data.
The imaging moment that star-loaded optical remote sensing device obtains image data is particularly significant to ground system.Remote sensor imaging time
Generally collectively constituted by whole second time-ofday signals and corresponding temporal information.At the time of whole moment second pulse is capable of providing precision highest
Signal.When moment second pulse-break whole on star, remote sensor will lose most accurate time-ofday signals, can only provide in image data
Temporal information, in addition transmission and packing encoding time delay of the temporal information inside remote sensor, cause imaging moment in image data
Accuracy be deteriorated.The present invention provides a kind of based on the star-loaded optical remote sensing device imaging time precision maintenance side broadcasted on star
Method can reduce delay of the temporal information inside remote sensor, make picture number in the case where moment second pulse-break whole on star
Imaging time precision in is better than temporal information.
Summary of the invention
Technology of the invention solves the problems, such as: the present invention provides it is a kind of based on the star-loaded optical remote sensing device broadcasted on star at
As time precision maintains method, in the case where the temporal information that in moment second pulse-break whole on star, only can be broadcasted on star,
Reduce delay of the temporal information inside remote sensor, the imaging time precision in remote sensor image data made to be better than temporal information,
Improve the accuracy of imaging time.
The technical solution of the invention is as follows: a kind of based on the star-loaded optical remote sensing device imaging time precision broadcasted on star dimension
Method is held, the management control unit, signal processing unit on method support star are accomplished in the following manner:
Management control unit receive simultaneously the broadcast time information that satellite data handling subsystem is sent by satellite bus and
The whole moment second pulse that GPS receiver is sent by RS422 interface；
Management control unit is simultaneously handled received broadcast time information and whole moment second pulse: to whole moment second
Pulse signal carries out shaping, driving generates GPS second pulse and is forwarded to signal processing unit；It forwards and broadcasts to signal processing unit
Temporal information and signal processing unit is forwarded to after generating internal pulse per second (PPS) by interrupt mode according to broadcast time information；
Signal processing unit receives GPS second pulse, internal pulse per second (PPS) and the broadcast time letter that management control unit is sent
Breath；When GPS second pulse is normal, GPS second pulse is used；It is spaceborne to realize using internal pulse per second (PPS) when GPS second pulse-break
Optical remote sensor imaging time precision maintains.
Further, management control unit only generates interruption to broadcast time information, after receiving broadcast time information, uses
Interrupt mode makes an immediate response, and generates an interrupt signal, this interrupt signal is converted into internal pulse per second (PPS) after level conversion.
Further, signal processing unit is counted using local clock, respectively in GPS second pulse, internal pulse per second (PPS)
Rising edge and the synchronous rising edge of row, counter values at this time are latched, these three numerical value are as spaceborne optics
The parameter that remote sensor local imaging moment data calculate, is stored in remote sensing images auxiliary data.
Further, the counter widths of signal processing unit counting meet during remote sensor entirely works and do not spill over.
Further, the imaging behavior of the synchronous characterization star-loaded optical remote sensing device of the row, each row, which synchronizes, represents star
The imaging of loaded optical remote sensing device is primary.
Further, the star-loaded optical remote sensing device local imaging moment:
In formula, the corresponding local Counter Value of n-th of pulse per second (PPS) are as follows: Nn；The corresponding local counter of n-th+m pulse per second (PPS)s
Value are as follows: Nn+m, it is T at the time of temporal information corresponds ton+m；Some row between n-th+m pulse per second (PPS)s and the n-th+m+1 pulse per second (PPS)s
Synchronous local Counter Value are as follows: NH。
Further, when GPS second pulse is normal, Nn、Nn+mCorrespond to the local count value of GPS second pulse；Work as GPS second
When pulse-break, Nn、Nn+mCorrespond to the local count value of internal pulse per second (PPS).
Further, the correction by choosing different m values, using the time averagely to local counter works frequency.
Further, the optimal 20-30 of m value range.
The present invention has the beneficial effect that compared with prior art
The present invention can reduce in the case where the temporal information broadcasted in moment second pulse-break whole on star, only star
Delay of the temporal information inside remote sensor makes the imaging moment precision in remote sensor image data be better than broadcast time information,
Improve the accuracy of imaging moment.
Management control unit is made an immediate response after receiving broadcast time information using interrupt mode, and issues hardware pulse (i.e.
Internal pulse per second (PPS)), prolong processing and transmission of the star-loaded optical remote sensing device at the time of receiving broadcast time information inside remote sensor
It is preferably minimized late.
Three parameters needed for calculating imaging moment, which are maintained in remote sensing images auxiliary data, passes to floor treatment, on star
Without processing, the design of product on star is simplified, also avoids introducing new error.
Counter widths, which meet during star-loaded optical remote sensing device entirely works, not to be spilt over, so that it may use time averaging side
Formula reduces the influence of local clock frequency drift, improves accuracy of timekeeping, and can choose different durations according to demand (i.e. m takes
Value), it is relatively more flexible.
Detailed description of the invention
Fig. 1 is sequential relationship schematic diagram of the present invention；
Fig. 2 is invention's principle block diagram；
Fig. 3 is the Method And Principle schematic diagram that the present invention calculates star-loaded optical remote sensing device imaging moment.
Specific embodiment
1-2 and example elaborate to the present invention with reference to the accompanying drawing.
Star-loaded optical remote sensing device in normal work, when receiving the broadcast that satellite data handling subsystem is sent by satellite bus
Between the whole moment second pulse sent by RS422 interface of information and GPS receiver.Management control in star-loaded optical remote sensing device
Unit is received and is handled to the two simultaneously.
Management control unit carries out shaping, driving to pulse signal after receiving whole moment second pulse, generates GPS second pulse simultaneously
It is forwarded by hardware interface to signal processing unit.After management control unit receives broadcast time information, remove to signal processing list
Member forwarding is outer, also generates internal pulse per second (PPS) and is sent by hardware interface to signal processing unit.
Generating internal pulse per second (PPS) is realized by the broadcast time information of management control unit identification bus.It is total in order to make
The hardware pulse signal (internal pulse per second (PPS)) that changes into that the broadcast time information of line is capable of minimum delay is sent to signal processing unit,
Management control unit only generates interruption to broadcast time information.When the reception subaddressing that management control unit is arranged in bus protocol
It after (Rx SUBADDRESS) receives broadcast time information, is made an immediate response using interrupt mode, generates an interrupt signal, in this
Break signal becomes a hardware pulse (i.e. internal pulse per second (PPS)), driving output is to signal processing unit after level conversion.
Signal processing unit receives GPS second pulse, internal pulse per second (PPS) and the broadcast time letter that management control unit is sent
Breath.Signal processing unit is counted using local clock, which, which meets during remote sensor entirely works, does not spill over,
Respectively in the rising edge of GPS second pulse, the rising edge of internal pulse per second (PPS) and row synchronization, counter values at this time are locked
It deposits, the parameter that these three numerical value are calculated as local imaging moment data is stored in remote sensing images auxiliary data.In this way when
After GPS second pulse stops, still there is internal pulse per second (PPS) to maintain necessary accuracy of timekeeping.And since internal pulse per second (PPS) is believed prior to the time
Arriving signal processing unit is ceased, therefore the time accuracy of internal pulse per second (PPS) is higher than time letter in remote sensing images auxiliary data
Breath.
The imaged rows of star-loaded optical remote sensing device are by the synchronous characterization of row, i.e., each row, which synchronizes, represents star-loaded optical remote sensing device
Imaging is primary, so at the time of row represents the imaging of this remote sensor at the time of synchronous.Further aim of the present invention be in order to
At the time of acquisition star-loaded optical remote sensing device is imaged every time, especially in the case where GPS second pulse-break, image data is compared in acquisition
The middle temporal information more accurate moment.The Method And Principle for calculating star-loaded optical remote sensing device imaging moment is as shown in Figure 3.
As shown in figure 3, setting the corresponding local Counter Value of k-th pulse per second (PPS) as NK；The then corresponding local of n-th of pulse per second (PPS)
Counter Value are as follows: Nn；The corresponding local Counter Value of n-th+m pulse per second (PPS)s are as follows: Nn+m, it is at the time of temporal information corresponds to
Tn+m.Some row between n-th+m pulse per second (PPS)s and the n-th+m+1 pulse per second (PPS)s is synchronized and is studied, if its local Counter Value
Are as follows: NH.Using above data, the imaging moment of the available row are as follows:
If:For practical frequency.NT=NH-Nn+m
Then formula (1) can be with abbreviation are as follows:
When star-loaded optical remote sensing device GPS second pulse is normal, above-mentioned calculating answers local count value using GPS second pulse pair.
When GPS second pulse-break, above-mentioned calculating uses the corresponding local count value of internal pulse per second (PPS).
The present invention is by choosing different m values, the correction using the time averagely to local counter works frequency.It is preferred that
, m value range 20-30.
Unspecified part of the present invention belongs to common sense well known to those skilled in the art.
Claims (9)
1. a kind of maintain method based on the star-loaded optical remote sensing device imaging time precision broadcasted on star, it is characterised in that: method according to
Management control unit, signal processing unit on support star are accomplished in the following manner:
Management control unit receives the broadcast time information that satellite data handling subsystem is sent by satellite bus simultaneously and GPS connects
The whole moment second pulse that receipts machine is sent by RS422 interface；
Management control unit is simultaneously handled received broadcast time information and whole moment second pulse: to whole moment second pulse
Signal carries out shaping, driving generates GPS second pulse and is forwarded to signal processing unit；Broadcast time is forwarded to signal processing unit
Information and signal processing unit is forwarded to after generating internal pulse per second (PPS) by interrupt mode according to broadcast time information；
Signal processing unit receives GPS second pulse, internal pulse per second (PPS) and the broadcast time information that management control unit is sent；When
When GPS second pulse is normal, GPS second pulse is used；When GPS second pulse-break, using internal pulse per second (PPS), to realize that spaceborne optics is distant
Sensor imaging time precision maintains.
2. according to the method described in claim 1, it is characterized by: management control unit is only in broadcast time information generation
It is disconnected, it after receiving broadcast time information, is made an immediate response using interrupt mode, generates an interrupt signal, this interrupt signal is by electricity
Flat turn is converted into internal pulse per second (PPS) after changing.
3. according to the method described in claim 1, it is characterized by: signal processing unit is counted using local clock, point
Not in the rising edge of GPS second pulse, the rising edge of internal pulse per second (PPS) and row synchronization, counter values at this time are locked
It deposits, the parameter that these three numerical value are calculated as star-loaded optical remote sensing device local imaging moment data, is stored in remote sensing images auxiliary
In data.
4. according to the method described in claim 3, it is characterized by: the counter widths of signal processing unit counting meet it is distant
Sensor is not spilt over during entirely working.
5. according to the method described in claim 3, it is characterized by: the imaging of the synchronous characterization star-loaded optical remote sensing device of the row
Behavior, each row, which synchronizes, represents the imaging of star-loaded optical remote sensing device once.
6. according to the method described in claim 3, it is characterized by: the star-loaded optical remote sensing device local imaging moment:
In formula, the corresponding local Counter Value of n-th of pulse per second (PPS) are as follows: Nn；The corresponding local Counter Value of n-th+m pulse per second (PPS)s are as follows:
Nn+m, it is T at the time of temporal information corresponds ton+m；It is same to some row between the n-th+m pulse per second (PPS)s and the n-th+m+1 pulse per second (PPS)s
The local Counter Value of step are as follows: NH。
7. according to the method described in claim 6, it is characterized by: when GPS second pulse is normal, Nn、Nn+mCorrespond to GPS second arteries and veins
The local count value of punching；When GPS second pulse-break, Nn、Nn+mCorrespond to the local count value of internal pulse per second (PPS).
8. according to the method described in claim 6, it is characterized by: by choosing different m values, using the time averagely to local
The correction of counter works frequency.
9. according to the method described in claim 8, it is characterized by: the optimal 20-30 of m value range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810777999.9A CN109164467A (en) | 2018-07-16 | 2018-07-16 | It is a kind of that method is maintained based on the star-loaded optical remote sensing device imaging time precision broadcasted on star |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810777999.9A CN109164467A (en) | 2018-07-16 | 2018-07-16 | It is a kind of that method is maintained based on the star-loaded optical remote sensing device imaging time precision broadcasted on star |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109164467A true CN109164467A (en) | 2019-01-08 |
Family
ID=64897906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810777999.9A Pending CN109164467A (en) | 2018-07-16 | 2018-07-16 | It is a kind of that method is maintained based on the star-loaded optical remote sensing device imaging time precision broadcasted on star |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109164467A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672069A (en) * | 2019-10-17 | 2020-01-10 | 中国科学院长春光学精密机械与物理研究所 | Satellite imaging method and system |
| CN112147924A (en) * | 2020-08-27 | 2020-12-29 | 航天东方红卫星有限公司 | High-precision program-controlled task management system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201853A (en) * | 2011-04-27 | 2011-09-28 | 航天东方红卫星有限公司 | Moonlet high-precision time synchronization method |
| CN105116714A (en) * | 2015-07-27 | 2015-12-02 | 上海卫星工程研究所 | System and method for measuring satellite telemetering and remote sensing data time scale precision |
-
2018
- 2018-07-16 CN CN201810777999.9A patent/CN109164467A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201853A (en) * | 2011-04-27 | 2011-09-28 | 航天东方红卫星有限公司 | Moonlet high-precision time synchronization method |
| CN105116714A (en) * | 2015-07-27 | 2015-12-02 | 上海卫星工程研究所 | System and method for measuring satellite telemetering and remote sensing data time scale precision |
Non-Patent Citations (3)
| Title |
|---|
| 年华等: "三线阵立体测绘相机高精度时间同步设计方法", 《电子测量技术》 * |
| 张凤等: "基于1553B总线的卫星星时同步方法", 《航天返回与遥感》 * |
| 李孝庆等: "一种基于1553B总线星时精确产生硬件秒脉冲的方法", 《导航定位与授时》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672069A (en) * | 2019-10-17 | 2020-01-10 | 中国科学院长春光学精密机械与物理研究所 | Satellite imaging method and system |
| CN112147924A (en) * | 2020-08-27 | 2020-12-29 | 航天东方红卫星有限公司 | High-precision program-controlled task management system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9838196B2 (en) | Synchronization apparatus, synchronization system, radio communication apparatus and synchronization method | |
| US20110268097A1 (en) | Method and system for adaptive synchronization of timing information generated by independently clocked communication nodes | |
| CN109655846A (en) | A kind of multistation difference post-processing high-precision time synchronization method and system | |
| TW200807008A (en) | Associating a universal time with a received signal | |
| JP2001221874A (en) | Time synchronization system | |
| WO2014046917A1 (en) | Enhanced broadcast ephemeris for high accuracy assisted gps positioning | |
| CN102291169A (en) | Onboard high-accuracy time synchronization method for satellite | |
| CN109164467A (en) | It is a kind of that method is maintained based on the star-loaded optical remote sensing device imaging time precision broadcasted on star | |
| CN106664145A (en) | Method for transmitting time synchronization messages in a communication network, network component, and communication network | |
| CN104597747A (en) | Synchronous test system based on tame rubidium clock and method thereof for increasing synchronization precision | |
| CN103913987A (en) | GPS timing system and method for obtaining precise time reference through GPS timing system | |
| CN110800246A (en) | Communication system, master device and slave device | |
| CN109743776B (en) | A time synchronization method for base station networking based on GNSS | |
| CN104683088A (en) | Multi-base synchronization method, device and system | |
| CN114286286B (en) | Time synchronization method, device, medium, and program product | |
| US20100260165A1 (en) | Remote i/o system and synchronization method in the same | |
| US7499512B2 (en) | Clock transmission apparatus for network synchronization between systems using an even-second clock and an Unshielded Twisted Pair (UTP) | |
| CN107666360B (en) | Train system time synchronization control method and device | |
| CN111010250B (en) | Method and system for realizing high-precision time synchronization | |
| CN110672069B (en) | Satellite imaging method and system | |
| CN107942362B (en) | A Pseudo-Range Calculation Method Without Time-Stamping of Navigation Messages | |
| EP1179764A2 (en) | Real time stamp distribution | |
| TWI773524B (en) | A time synchronization method used in a precision time protocol system | |
| JP6482733B2 (en) | Position measuring system, position measuring device and receiving device | |
| JP2005134215A (en) | System for measuring difference of signal arrival time |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190108 |