CN105824231A - Satellite-earth time delay measurement system and work method thereof - Google Patents
Satellite-earth time delay measurement system and work method thereof Download PDFInfo
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- CN105824231A CN105824231A CN201610194994.4A CN201610194994A CN105824231A CN 105824231 A CN105824231 A CN 105824231A CN 201610194994 A CN201610194994 A CN 201610194994A CN 105824231 A CN105824231 A CN 105824231A
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- 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
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- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G7/00—Synchronisation
Abstract
The invention provides a satellite-earth time delay measurement system and a work method thereof. The system comprises a GPS receiver, a spaceborne computer, a responder, a down converter, GPS timing equipment, measurement and control base-band equipment and measurement and control center management equipment. The satellite-earth time delay measurement system has the following advantages: 1, time is calibrated by use of the GPS receiver and the GPS timing equipment through adoption of the same GPS signals, time of satellite and ground test systems is unified, first bit rising edge time of a satellite remote measurement frame is directly read by use of software, local time of a first bit rising edge is demodulated through a ground device, a satellite-earth time delay is obtained through calculation, and rapid measurement, querying and counting of the satellite-earth time delay can be conveniently realized by direct use of the software; 2, the rapid measurement of the satellite-earth time delay is realized without reliance on such auxiliary devices as an oscilloscope and the like; and 3, the system has certain versatility in tests of satellite-earth time delays of satellites of various models.
Description
Technical field
The present invention relates to space technology Satellite technical field, particularly a kind of star ground latency measurement system and method for work thereof.
Background technology
Satellite carried computer typically have employed high-precision clock, but still cannot keep Tong Bu with terrestrial clock, it is therefore desirable to is calibrated satellite.Before when carrying out satellite school, need to know star ground time difference exactly, and when carrying out the time difference calculating of star ground, star ground time delay is an extremely important factor.It has been generally acknowledged that star ground time delay is that answering machine carries out the baseband equipment solution in on-board processing time delay that the process such as chnnel coding, modulation causes and ground receiving equipment and is in harmonious proportion the general designation of time delay sum that channel decoding procedures causes.Star ground time delay is important parameter during satellite school, will directly affect accuracy during satellite school.
Description according to prior art, star ground time delay is measured the time difference between the first bit forward position pulse demodulating telemetry frame generally by the first bit forward position pulse and ground observing and controlling baseband equipment sending telemetry frame on oscilloscope measurement star, owing to being required to carry out by oscillograph when measuring every time, in actual use have inconvenience more, and is inconvenient to carry out the statistical analysis of star ground time delay.
Summary of the invention
For defect of the prior art, it is an object of the invention to provide a kind of unified star ground latency measurement system realizing the star ground time and method of work thereof.
For solving above-mentioned technical problem, a kind of star ground latency measurement system that the present invention provides, including: GPS, it is used for receiving gps signal and exporting GPS second pulse signal being sent to spaceborne computer；Described spaceborne computer is used for carrying out GPS second pulse school, and generates timing code on star, and is modulated being sent to answering machine after timing code loading telemetry on described star；Described answering machine is modulated to radiofrequency signal for the described telemetry sent by described spaceborne computer；Low-converter, described low-converter is for carrying out frequency conversion by described radiofrequency signal；GPS timing equipment, described GPS timing equipment is used for receiving gps signal, exports GPS Timing Signal；Observing and controlling baseband equipment, the signal after described low-converter frequency conversion received is demodulated by described observing and controlling baseband equipment, stamp local zone time code, and send comprising the data via the demodulation of described observing and controlling baseband equipment of timing code on described local zone time code and described star to measurement and control center's management equipment；The data via the demodulation of described observing and controlling baseband equipment that described measurement and control center management equipment comes for receiving described observing and controlling baseband equipment to send, carry out time delay resolving.
Preferably, described telemetry is telemetry frame.
Preferably, radiofrequency signal described in described low-converter carries out frequency conversion is intermediate-freuqncy signal.
Preferably, the frequency of described intermediate-freuqncy signal is 70MHz.
Preferably, described observing and controlling baseband equipment is using GPS Timing Signal as outside timing system, the signal after described low-converter frequency conversion received is demodulated, stamp local zone time code, and send comprising the data via the demodulation of described observing and controlling baseband equipment of timing code on described local zone time code and described star to measurement and control center's management equipment.
The method of work of a kind of star ground latency measurement system, comprises the steps:
Step 1, equipment and software initialization, GPS timing equipment works and exports Timing Signal；
Step 2, arranging observing and controlling baseband equipment is outside timing system；
Step 3, opens GPS, exports GPS second pulse signal；
Step 4, arranges spaceborne computer and carries out state during GPS second pulse school；
Step 5, timing code on star is loaded telemetry, and send answering machine to be modulated by spaceborne computer；
Step 6, the local zone time code that observing and controlling baseband equipment record demodulates, send to measurement and control center's management equipment together with telemetry；
Step 7, measurement and control center's management equipment reads timing code on the local zone time code of observing and controlling baseband equipment and star from the telemetry received, and calculates local zone time code and timing code on the star time difference relative to same benchmark, with being star time delay；
Circulation step 5～step 7.
Preferably, on described star, timing code is the moment on the star that the first bit rising edge of each telemetry frame with described spaceborne computer is corresponding.
Preferably, described local zone time code is the local moment corresponding with the first bit rising edge of each telemetry frame.
Preferably, described telemetry is telemetry frame.
Compared with prior art, beneficial effects of the present invention is as follows:
1, GPS and GPS timing equipment is used to use same gps signal to be calibrated, by satellite, ground testing system time unification, software direct readout satellite telemetry frame the first bit rising edge time and ground installation is utilized to demodulate the local moment of the first bit rising edge, and by being calculated star ground time delay, and directly utilize quickly measuring, inquire about and adding up of software with conveniently realizing star time delay.
2, the quick measurement of star ground time delay is achieved, it is not necessary to rely on the auxiliary equipments such as oscillograph.
3, the test to various model Satellites ground time delay has certain versatility.
Accompanying drawing explanation
The detailed description made non-limiting example with reference to the following drawings by reading, the further feature purpose of the present invention and advantage will become more apparent upon.
Fig. 1 is star of the present invention ground latency measurement systematic schematic diagram；
Fig. 2 is the method for work flow chart of star ground latency measurement system.
In figure:
101-GPS receiver 102-spaceborne computer 103-answering machine
104-low-converter 105-GPS timing equipment 106-observing and controlling baseband equipment
107-measurement and control center management equipment
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following example will assist in those skilled in the art and are further appreciated by the present invention, but limit the present invention the most in any form.It should be pointed out that, to those skilled in the art, without departing from the inventive concept of the premise, it is also possible to make some changes and improvements.These broadly fall into protection scope of the present invention.
As it is shown in figure 1, star of the present invention ground latency measurement system includes: GPS 101, it is used for receiving gps signal and exporting GPS second pulse signal being sent to spaceborne computer 102；When spaceborne computer 102 is used for carrying out GPS second pulse school, and generate timing code on star, and be modulated being sent to answering machine 103 after timing code loading telemetry frame on star；Answering machine 103 is for being modulated to radiofrequency signal by the telemetry frame that spaceborne computer 102 sends；Low-converter 104 is 70MHz intermediate frequency for radiofrequency signal is carried out frequency conversion；GPS timing equipment 105 is used for receiving gps signal, exports GPS Timing Signal；The GPS Timing Signal that observing and controlling baseband equipment 106 exports using GPS timing equipment 105 is as outside timing system, signal after downconverted device 104 frequency conversion received is demodulated, stamp local zone time code, and the data demodulated via observing and controlling baseband equipment 106 comprising timing code on local zone time code and star are sent to measurement and control center and manage equipment 107；The data via observing and controlling baseband equipment 106 demodulation that measurement and control center's management equipment 107 comes for receiving observing and controlling baseband equipment 106 to send, carry out time delay resolving, it is possible to carry out inquiring about, statistics etc..
As in figure 2 it is shown, the method for work of a kind of star ground latency measurement system, this method of testing comprises the steps:
Step S201, equipment and software initialization, GPS timing equipment works and exports Timing Signal；
Step S202, arranging observing and controlling baseband equipment is outside timing system；
Step S203, opens GPS, exports GPS second pulse signal；
Step S204, arranges spaceborne computer and carries out state during GPS second pulse school；
Step S205, spaceborne computer by the moment on star corresponding for the first bit rising edge of each telemetry frame, forms timing code on star, loads telemetry frame, and send answering machine to be modulated；
Step S206, in the local moment that the first bit rising edge of each telemetry frame that observing and controlling baseband equipment record demodulates is corresponding, forms local zone time code, sends to measurement and control center together with telemetry frame data and manages equipment；
Step S207, measurement and control center's management equipment reads local moment and the satellite moment of observing and controlling baseband equipment from the data received, calculates the two time difference relative to same benchmark, be star ground time delay (transmitting impact with not considering star).
Above the specific embodiment of the present invention is described.It is to be appreciated that the invention is not limited in above-mentioned particular implementation, those skilled in the art can make a variety of changes within the scope of the claims or revise, and this has no effect on the flesh and blood of the present invention.In the case of not conflicting, the feature in embodiments herein and embodiment can arbitrarily be mutually combined.
Claims (9)
1. a star ground latency measurement system, it is characterised in that including:
GPS, is used for receiving gps signal and exporting GPS second pulse signal being sent to spaceborne computer；
Described spaceborne computer is used for carrying out GPS second pulse school, and generates timing code on star, and is modulated being sent to answering machine after timing code loading telemetry on described star；
Described answering machine is modulated to radiofrequency signal for the described telemetry sent by described spaceborne computer；
Low-converter, described low-converter is for carrying out frequency conversion by described radiofrequency signal；
GPS timing equipment, described GPS timing equipment is used for receiving gps signal, exports GPS Timing Signal；
Observing and controlling baseband equipment, the signal after described low-converter frequency conversion received is demodulated by described observing and controlling baseband equipment, stamp local zone time code, and send comprising the data via the demodulation of described observing and controlling baseband equipment of timing code on described local zone time code and described star to measurement and control center's management equipment；
The data via the demodulation of described observing and controlling baseband equipment that described measurement and control center management equipment comes for receiving described observing and controlling baseband equipment to send, carry out time delay resolving.
Star the most according to claim 1 ground latency measurement system, it is characterised in that described telemetry is telemetry frame.
Star the most according to claim 1 ground latency measurement system, it is characterised in that it is intermediate-freuqncy signal that radiofrequency signal described in described low-converter carries out frequency conversion.
Star the most according to claim 3 ground latency measurement system, it is characterised in that the frequency of described intermediate-freuqncy signal is 70MHz.
Star the most according to claim 1 ground latency measurement system, it is characterized in that, described observing and controlling baseband equipment is using GPS Timing Signal as outside timing system, the signal after described low-converter frequency conversion received is demodulated, stamp local zone time code, and send comprising the data via the demodulation of described observing and controlling baseband equipment of timing code on described local zone time code and described star to measurement and control center's management equipment.
6. the method for work of a star ground latency measurement system, it is characterised in that comprise the steps:
Step 1, equipment and software initialization, GPS timing equipment works and exports Timing Signal；
Step 2, arranging observing and controlling baseband equipment is outside timing system；
Step 3, opens GPS, exports GPS second pulse signal；
Step 4, arranges spaceborne computer and carries out state during GPS second pulse school；
Step 5, timing code on star is loaded telemetry, and send answering machine to be modulated by spaceborne computer；
Step 6, the local zone time code that observing and controlling baseband equipment record demodulates, send to measurement and control center's management equipment together with telemetry；
Step 7, measurement and control center's management equipment reads timing code on the local zone time code of observing and controlling baseband equipment and star from the telemetry received, and calculates local zone time code and timing code on the star time difference relative to same benchmark, with being star time delay；
Circulation step 5～step 7.
The method of work of star the most according to claim 6 ground latency measurement system, it is characterised in that on described star, timing code is the moment on the star that the first bit rising edge of each telemetry frame with described spaceborne computer is corresponding.
The method of work of star the most according to claim 6 ground latency measurement system, it is characterised in that described local zone time code is the local moment corresponding with the first bit rising edge of each telemetry frame.
The method of work of star the most according to claim 6 ground latency measurement system, it is characterised in that described telemetry is telemetry frame.
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| CN107329394A (en) * | 2017-05-16 | 2017-11-07 | 上海卫星工程研究所 | High precision star ground time difference measurement method |
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| CN109039421A (en) * | 2018-06-28 | 2018-12-18 | 上海卫星工程研究所 | Method for multi-load data relative transport delay testing |
| CN111490785A (en) * | 2020-04-26 | 2020-08-04 | 华中科技大学 | Time delay measuring device and method of data acquisition system |
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| CN111490785A (en) * | 2020-04-26 | 2020-08-04 | 华中科技大学 | Time delay measuring device and method of data acquisition system |
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Application publication date: 20160803 |