CN106533529B - Satellite two-way time comparison modulation and demodulation system and method - Google Patents
Satellite two-way time comparison modulation and demodulation system and method Download PDFInfo
- Publication number
- CN106533529B CN106533529B CN201610856703.3A CN201610856703A CN106533529B CN 106533529 B CN106533529 B CN 106533529B CN 201610856703 A CN201610856703 A CN 201610856703A CN 106533529 B CN106533529 B CN 106533529B
- Authority
- CN
- China
- Prior art keywords
- signal
- intermediate frequency
- frequency
- receiving
- frequency signal
- 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.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Electric Clocks (AREA)
- Superheterodyne Receivers (AREA)
Abstract
The invention discloses a modulation and demodulation system for satellite two-way time comparison, which comprises: the frequency reference module is used for converting the received external frequency reference signal into a local oscillator frequency signal and a clock signal; the signal receiving module is used for receiving the received signal transmitted by the comparison station and processing the received signal to obtain a low-intermediate frequency signal; the signal processing module is used for receiving the pulse per second signal and the low intermediate frequency signal to obtain a synthesized low intermediate frequency signal; the signal sending module is used for processing the synthesized low-intermediate frequency signal to obtain a sending signal and sending the sending signal to the comparison station; the invention also discloses a satellite bidirectional time comparison modulation and demodulation method applying the system.
Description
Technical Field
The invention relates to the field of satellite two-way time comparison. And more particularly to a satellite two-way time-alignment modem system and method.
Background
The satellite two-way time comparison method is a high-precision time transmission technology, and utilizes the forwarding time of a geosynchronous communication satellite to transmit timing modulation information between earth stations, so as to realize time information interaction and high-precision time difference measurement of each station.
The satellite bidirectional time comparison system generally comprises two or more stations which work cooperatively, wherein each station mainly comprises a time transmission modem, a satellite transceiver, a satellite antenna and other equipment, and the symmetry of a bidirectional transmission link is utilized to eliminate path delay so as to realize nanosecond-level time difference measurement. The working principle of the traditional satellite bidirectional time ratio modem is that a 10MHz frequency standard signal and a second pulse signal of an atomic clock are modulated to 70MHz intermediate frequency by the modem and then input to a satellite communication ground station, and meanwhile, the modem receives the 70MHz intermediate frequency signal output by the satellite communication ground station, demodulates data information and the second pulse signal from the 70MHz intermediate frequency signal, and finally realizes the measurement of the clock difference between two places. However, because the signal input and output of the conventional bidirectional time comparison device are all 70MHz, when a bidirectional time comparison system is constructed, only transceivers which are large, heavy and obsolete can be used as frequency conversion equipment, and up-conversion power amplifier equipment which is small in size and has better performance cannot be directly used, or only one stage of frequency conversion equipment can be added. The development of the satellite two-way time comparison system towards miniaturization and portability is greatly limited, and the application of the two-way time comparison technology is adversely affected.
Disclosure of Invention
In order to solve at least one of the above problems, the present invention provides a satellite two-way time comparison modulation and demodulation system and method, which can ensure high measurement accuracy and make the system compact and portable.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a modulation and demodulation system for satellite two-way time comparison, which is characterized by comprising the following components:
the frequency reference module is used for converting the received external frequency reference signal into a local oscillator frequency signal and a clock signal;
the signal receiving module is used for receiving the received signal transmitted by the comparison station by taking the local oscillator frequency signal as a reference, and processing the received signal to obtain a low intermediate frequency signal;
the signal processing module is used for receiving the pulse per second signal and the low intermediate frequency signal and obtaining a synthesized low intermediate frequency signal by taking the clock signal as a reference;
the signal sending module is used for processing the synthesized low-intermediate frequency signal by taking the local oscillator frequency signal as a reference to obtain a sending signal and sending the sending signal to the comparison station;
and the main control module is used for controlling the signal processing module to track the received signal and the sent signal to obtain pseudo-range measurement information so as to obtain two-earth clock error.
Preferably, the frequency reference module includes a multi-channel frequency synthesizer, and the multi-channel frequency synthesizer is configured to receive an external frequency reference signal and convert the frequency reference signal into a local oscillation frequency signal and a clock signal.
Preferably, the signal receiving module includes a down converter and an automatic gain controller, the down converter is configured to receive a receiving signal sent by the comparison station, and down convert the receiving signal to a low intermediate frequency signal, and the automatic gain controller is configured to receive the low intermediate frequency signal, and output the low intermediate frequency signal to the signal processing module after performing level adjustment.
Preferably, the signal processing module includes a modem combination functional unit and a time service unit, the modem combination functional unit is configured to receive the low intermediate frequency signal and the external pulse per second signal to obtain a synthesized low intermediate frequency signal, and the time service unit is configured to provide standard timestamp information for the modem combination functional unit.
Preferably, the signal sending module includes a mixer, and the mixer is configured to receive the synthesized low intermediate frequency signal transmitted by the signal processing module, up-convert the synthesized low intermediate frequency signal to obtain a sending signal, and send the sending signal to the comparison station.
Preferably, the main control module includes a main control computer and a display, the main control computer is configured to track the received signal and the transmitted signal to obtain pseudo-range measurement information, so as to obtain a clock error between two locations, and the display is configured to display an operating state of the main control computer.
Preferably, the frequency reference module is configured to convert the received external frequency reference signal into a clock signal and a local oscillator frequency signal of a frequency group consisting of integer and fractional clock signals.
Preferably, the signal receiving module and the signal transmitting module are configured to receive and transmit the receiving signal and the transmitting signal in the L-band.
Preferably, the frequency reference module and the signal processing module are configured to receive the frequency reference signal and the pulse per second signal of the same source coherent.
The invention also discloses a modulation and demodulation method for satellite two-way time comparison, which is characterized by comprising the following steps:
s1: converting the received frequency reference signal into a local oscillation frequency signal and a clock signal;
s2: receiving a receiving signal transmitted by a comparison station by taking the local oscillator frequency signal as a reference, and processing to obtain a low intermediate frequency signal;
s3: receiving a pulse per second signal and the low intermediate frequency signal, and obtaining a synthesized low intermediate frequency signal by taking the clock signal as a reference;
s4: processing the synthesized low-intermediate frequency signal by taking the local oscillator frequency signal as a reference to obtain a sending signal, and sending the sending signal to the comparison station;
s5: and tracking the received signal and the transmitted signal to obtain pseudo-range measurement information, thereby obtaining two earth clock differences.
The invention has the following beneficial effects:
the invention discloses a bidirectional time comparison modulation and demodulation system and a method, which can overcome the problems of large volume and heavy weight of a satellite bidirectional comparison system applying a traditional modem, ensure high measurement precision and simultaneously ensure the miniaturization and portability of the bidirectional time comparison modulation and demodulation system.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a schematic structural diagram of a satellite bidirectional time alignment modem system disclosed in the present invention.
Fig. 2 is a schematic structural diagram of a preferred embodiment of a satellite two-way time alignment modem system disclosed in the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
As shown in fig. 1, in one aspect, the present invention discloses a satellite two-way time comparison modulation and demodulation system, which includes: the device comprises a frequency reference module, a signal receiving module, a signal processing module, a signal sending module and a main control module.
The frequency reference module is used for converting the received external frequency reference signal into a local oscillator frequency signal and a clock signal. The frequency reference signal is preferably 10MHz, and the clock signal can comprise an integer clock signal and a decimal clock signal; the frequency reference module is preferably a multichannel frequency synthesizer 1.
The signal receiving module is configured to receive a received signal transmitted by a comparison station with the local oscillator frequency signal as a reference, process the received signal to obtain a low intermediate frequency signal, and transmit the low intermediate frequency signal to the signal processing module, where the received signal may be an L-band signal, and the signal receiving module may include a down converter 3 and an automatic gain controller 4;
the signal processing module is configured to receive a pulse per second signal and the low-intermediate frequency signal, and obtain a synthesized low-intermediate frequency signal with reference to the clock signal, where the pulse per second signal and the frequency reference signal are homologous coherent, and the signal processing module may include a modulation and demodulation combination functional unit 5 and an NTP/GNSS timing unit 8;
the signal sending module is configured to process the synthesized low-intermediate frequency signal with the local oscillator frequency signal as a reference to obtain a sending signal, and send the sending signal to the comparison station, where the signal sending module may include a mixer 2, and the sending signal may be an L-band signal;
the main control module is used for controlling the signal processing module to track the processes of the received signal and the transmitted signal and obtain pseudo-range measurement information so as to obtain the clock error of two places, and the main control module may include a main control computer 6 and a display 7.
In a preferred embodiment of the present invention, as shown in fig. 2, the system comprises: the device comprises a multichannel frequency synthesizer 1, a mixer 2, a down converter 3, an automatic gain controller 4, a modulation and demodulation combination functional unit 5, a main control computer 6, a display 7 and an NTP/GNSS time service unit 8. The connection relationship of each component can be as follows: the local oscillation frequency output end of the multichannel frequency synthesizer 1 is connected with the reference frequency input end of the frequency mixer 2 and the down converter 3 through radio frequency cables; the clock signal of the multi-channel frequency synthesizer 1 is connected with a radio frequency cable at the reference frequency input end of the modulation and demodulation combined functional unit 5; the signal output end of the down converter 3 is connected with the signal input end of the automatic gain controller 4 through a radio frequency cable; the signal output end of the automatic gain controller 4 is connected with a radio frequency cable at the low-intermediate frequency signal input end of the modulation-demodulation combined functional unit 5; the synthesized low-intermediate frequency signal output end of the modulation-demodulation combined functional unit 5 is connected with a radio frequency cable at the signal input end of the mixer 2; the data output end of the modulation-demodulation combined functional unit 5 is connected with the main control computer 6 through a data bus; the control end of the modulation-demodulation combined functional unit 5 is connected with the main control computer 6 through a control bus; the main control machine 6 is connected with the display 7 through a signal line; the time stamp information output end of the NTP/GNSS time service unit 8 is connected with the data output end of the modulation and demodulation combined functional unit 5 through a data bus.
When the preferred embodiment is in operation, an external time frequency reference provides a 10MHz frequency reference signal for the multi-channel frequency synthesizer 1, the multi-channel frequency synthesizer 1 outputs a local oscillation frequency, an integer clock signal and a decimal clock signal required by each module in a system after frequency synthesis, the integer clock signal and the decimal clock signal are used as time frequency references of the modulation and demodulation combined functional unit 5, the phase noise performance requirements of the integer clock signal and the decimal clock signal are high, and the local oscillation frequency is an L-band frequency and is used by the mixer 2 and the down converter 3; the system needs to receive an L-waveband satellite bidirectional comparison signal output by an up-conversion power amplifier of a comparison station, and simultaneously sends an L-waveband signal bidirectional comparison sending signal generated by the system to the up-conversion power amplifier, after the system is initialized, the system is timed by an NTP server or a GNSS navigation system through an NTP/GNSS timing unit 8, standard timestamp information is provided for the system, so that second-level time synchronization is realized between the station and the comparison station, a modulation-demodulation combined function unit 5 receives a second pulse signal and synthesizes a low-intermediate frequency signal, the synthesized low-intermediate frequency signal is transmitted to a mixer 2, the mixer 2 up-converts the synthesized low-intermediate frequency signal to a local L-waveband signal, and the local L-waveband signal is sent to the up-conversion power amplifier of the comparison station as a sending signal; meanwhile, the down converter 3 receives an L-band signal output by an up-conversion power amplifier of the comparison station and down-converts the L-band signal into a low-intermediate frequency signal, and then adjusts the output level of the low-intermediate frequency signal through the automatic gain controller 4 and sends the low-intermediate frequency signal to the modulation-demodulation combination functional unit 5 to demodulate the signal and resolve the information. The modulation-demodulation combination functional unit 5 performs a series of operations such as acquisition, tracking and measurement on the transmitted and received bidirectional comparison signals, then calculates pseudo-range information, and sends the pseudo-range information and pseudo-range measurement information of the local station and the comparison station to the main control computer 6 through a system bus; the main control machine 6 is used as a control and data processing center of the system, on one hand, the working state of the system is controlled and monitored, on the other hand, the clock difference data is calculated after the data transmitted by the modulation-demodulation combined functional unit 5 is subjected to gross error rejection and filtering smoothing, and the clock difference between two places is obtained and displayed on a user interface of the display 7.
In another aspect, the present invention also discloses a satellite two-way time ratio modulation and demodulation method using the system, and in a preferred embodiment as shown in fig. 2, the method includes the following steps:
s1: the received frequency reference signal is converted into a local oscillation frequency signal and a clock signal. The multi-channel frequency synthesizer 1 receives a 10MHz frequency reference signal provided by an external time frequency reference, outputs a local oscillation frequency, an integer clock signal and a decimal clock signal required by each module in a system after frequency synthesis, the integer clock signal and the decimal clock signal are used as time frequency reference signals of a modulation-demodulation combined functional unit 5, the phase noise performance requirements of the integer clock signal and the decimal clock signal are high, and the local oscillation frequency is L-band frequency and is used by a mixer 2 and a down converter 3.
S2: and receiving the received signal transmitted by the comparison station by taking the local oscillator frequency signal as a reference, and processing to obtain a low intermediate frequency signal. The down converter 3 receives an L-band satellite bidirectional comparison signal output by an up-conversion power amplifier of the comparison station, down-converts the signal to a low-intermediate frequency signal, adjusts the output level of the signal through the automatic gain controller 4, and sends the signal to the modulation-demodulation combination functional unit 5 to demodulate the signal and resolve information.
S3: and receiving the pulse per second signal and the low intermediate frequency signal, and obtaining a synthesized low intermediate frequency signal by taking the clock signal as a reference. After the system is initialized, an NTP server or a GNSS navigation system is used for time service on the system through an NTP/GNSS time service unit 8, standard timestamp information is provided for the system, second-level time synchronization between the local station and a comparison station is achieved, a second pulse signal is received and synthesized into a low-intermediate frequency signal, and then a modulation-demodulation combination function unit 5 transmits the synthesized low-intermediate frequency data signal to a mixer 2.
S4: and processing the synthesized low-intermediate frequency signal by taking the local oscillator frequency signal as a reference to obtain a sending signal, and sending the sending signal to the comparison station. And up-converting the synthesized low-intermediate frequency signal to a local L-band signal through a mixer 2 of a signal sending module, and sending the local L-band signal to a comparison station.
S5: and tracking the received signal and the transmitted signal to obtain pseudo-range measurement information, thereby obtaining two earth clock differences. The modulation-demodulation combination functional unit 5 performs a series of operations such as acquisition, tracking and measurement on the transmitted and received bidirectional comparison signals, then calculates pseudo-range information, and then simultaneously sends the pseudo-range measurement information of the local station and the comparison station to a main control computer through a system bus; the main control computer is used as a control and data processing center of the system, on one hand, the working state of the system is controlled and monitored, on the other hand, the pseudo-range measurement information transmitted by the modulation-demodulation combined functional unit 5 is subjected to gross error elimination, filtering smoothing and then clock error data calculation, and the clock error of two places is obtained and displayed on a user interface of the display 7.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (9)
1. A satellite two-way time-alignment modem system, comprising:
the frequency reference module is used for converting the received external frequency reference signal into a local oscillator frequency signal and a clock signal;
the signal receiving module is used for receiving a receiving signal transmitted by the comparison station by taking the local oscillator frequency signal as a reference, and processing the receiving signal to obtain a low intermediate frequency signal, wherein the receiving signal is an L waveband;
the signal processing module is used for receiving the pulse per second signal and the low intermediate frequency signal and obtaining a synthesized low intermediate frequency signal by taking the clock signal as a reference;
the signal processing module comprises a modulation and modulation combined functional unit and an NTP/GNSS time service unit; the NTP/GNSS time service unit is used for time service of the system, standard timestamp information is provided for the system, and second-level time synchronization is achieved between the local station and the comparison station;
the signal sending module is used for processing the synthesized low-intermediate frequency signal by taking the local oscillator frequency signal as a reference to obtain a sending signal and sending the sending signal to the comparison station, wherein the receiving signal is an L waveband;
and the main control module is used for controlling the signal processing module to track the received signal and the sent signal to obtain pseudo-range measurement information so as to obtain two-earth clock error.
2. The system of claim 1, wherein the frequency reference module comprises a multi-channel frequency synthesizer, the multi-channel frequency synthesizer being configured to receive an external frequency reference signal and convert the frequency reference signal into a local oscillator frequency signal and a clock signal.
3. The system of claim 1, wherein the signal receiving module comprises a down converter and an automatic gain controller, the down converter is configured to receive a receiving signal sent by the comparison station, down convert the receiving signal to a low intermediate frequency signal, and the automatic gain controller is configured to receive the low intermediate frequency signal, level-adjust the low intermediate frequency signal, and output the level-adjusted low intermediate frequency signal to the signal processing module.
4. The system according to claim 1, wherein the signal processing module includes a modem combination function unit and a time service unit, the modem combination function unit is configured to receive the low intermediate frequency signal and the external pulse-per-second signal to obtain a synthesized low intermediate frequency signal, and the time service unit is configured to provide standard timestamp information for the modem combination function unit.
5. The system according to claim 1, wherein the signal transmission module comprises a mixer, and the mixer is configured to receive the synthesized low intermediate frequency signal transmitted by the signal processing module, up-convert the synthesized low intermediate frequency signal to obtain a transmission signal, and transmit the transmission signal to the comparison station.
6. The system of claim 1, wherein said master control module comprises a master controller and a display, said master controller is configured to track said received signal and said transmitted signal to obtain pseudorange measurement information, thereby obtaining a clock error, and said display is configured to display an operation status of said master controller.
7. The system of claim 1, wherein the frequency reference module is configured to convert the received external frequency reference signal into a clock signal and a local oscillator frequency signal of a frequency group consisting of integer and fractional clock signals.
8. The system of claim 1, wherein the frequency reference module and the signal processing module are configured to receive the frequency reference signal and the pulse-per-second signal that are homologous coherent.
9. A satellite bidirectional time comparison modulation and demodulation method is characterized by comprising the following steps:
s1: converting the received frequency reference signal into a local oscillation frequency signal and a clock signal;
s2: receiving the L-waveband receiving signal transmitted by the comparison station by taking the local oscillator frequency signal as a reference, and processing to obtain a low intermediate frequency signal;
s3: receiving a pulse per second signal and the low intermediate frequency signal, and obtaining a synthesized low intermediate frequency signal by taking the clock signal as a reference;
s4: processing the synthesized low-intermediate frequency signal by taking the local oscillator frequency signal as a reference to obtain a sending signal, and sending the sending signal to the comparison station;
s5: and tracking the received signal and the transmitted signal to obtain pseudo-range measurement information, thereby obtaining two earth clock differences.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610856703.3A CN106533529B (en) | 2016-09-27 | 2016-09-27 | Satellite two-way time comparison modulation and demodulation system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610856703.3A CN106533529B (en) | 2016-09-27 | 2016-09-27 | Satellite two-way time comparison modulation and demodulation system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106533529A CN106533529A (en) | 2017-03-22 |
| CN106533529B true CN106533529B (en) | 2020-03-03 |
Family
ID=58344237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610856703.3A Active CN106533529B (en) | 2016-09-27 | 2016-09-27 | Satellite two-way time comparison modulation and demodulation system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106533529B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107707306A (en) * | 2017-08-24 | 2018-02-16 | 北京无线电计量测试研究所 | A kind of two-way time synchronism apparatus of high-precision optical fiber |
| CN108134625B (en) * | 2017-12-11 | 2020-09-01 | 北京无线电计量测试研究所 | Satellite bidirectional time frequency transmission method |
| CN109039496B (en) * | 2018-08-23 | 2021-06-29 | 北京无线电计量测试研究所 | Auxiliary measurement device and method for time delay change of bidirectional comparison modem |
| CN110471094B (en) * | 2019-07-17 | 2021-01-29 | 中国电子科技集团公司第五十四研究所 | Time comparison system and comparison method for digital real-time processing |
| CN111338204B (en) * | 2020-05-15 | 2020-09-22 | 北京无线电计量测试研究所 | Decentralized integrated atomic time system and establishing method thereof |
| CN114690844A (en) * | 2020-12-29 | 2022-07-01 | 长沙北斗产业安全技术研究院有限公司 | Method and device for generating high-precision clock trigger signal |
| CN113489509B (en) * | 2021-07-06 | 2023-05-26 | 上海方位角数据科技有限公司 | Time-frequency synchronization method and device between large-scale GNSS pseudolites |
| CN114900247B (en) * | 2021-12-29 | 2024-03-29 | 北京无线电计量测试研究所 | Intelligent testing device for double pseudo code bidirectional comparison |
| CN114640375B (en) * | 2022-03-18 | 2023-12-26 | 北京无线电计量测试研究所 | Clock phase determination modem system and use method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3808365A (en) * | 1970-12-08 | 1974-04-30 | Gretag Ag | Method and apparatus for encoding and decoding messages |
| CN101251594A (en) * | 2008-04-03 | 2008-08-27 | 北京航空航天大学 | Bidirectional ranging and time comparision process terminal |
| CN103454911A (en) * | 2013-09-16 | 2013-12-18 | 中国航天科工集团第二研究院二〇三所 | Rough synchronization method for satellite bidirectional time comparison |
| CN104181550A (en) * | 2014-08-19 | 2014-12-03 | 北京无线电计量测试研究所 | Common view time and frequency transmitting method based on BeiDou navigation satellite system |
| CN104579530A (en) * | 2014-11-28 | 2015-04-29 | 中国电子科技集团公司第五十四研究所 | High-accuracy time unification and communication integrated device |
| CN104954093A (en) * | 2015-06-29 | 2015-09-30 | 北京无线电计量测试研究所 | High-precision remote time transmission system and method based on optical fibers |
-
2016
- 2016-09-27 CN CN201610856703.3A patent/CN106533529B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3808365A (en) * | 1970-12-08 | 1974-04-30 | Gretag Ag | Method and apparatus for encoding and decoding messages |
| CN101251594A (en) * | 2008-04-03 | 2008-08-27 | 北京航空航天大学 | Bidirectional ranging and time comparision process terminal |
| CN103454911A (en) * | 2013-09-16 | 2013-12-18 | 中国航天科工集团第二研究院二〇三所 | Rough synchronization method for satellite bidirectional time comparison |
| CN104181550A (en) * | 2014-08-19 | 2014-12-03 | 北京无线电计量测试研究所 | Common view time and frequency transmitting method based on BeiDou navigation satellite system |
| CN104579530A (en) * | 2014-11-28 | 2015-04-29 | 中国电子科技集团公司第五十四研究所 | High-accuracy time unification and communication integrated device |
| CN104954093A (en) * | 2015-06-29 | 2015-09-30 | 北京无线电计量测试研究所 | High-precision remote time transmission system and method based on optical fibers |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106533529A (en) | 2017-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106533529B (en) | Satellite two-way time comparison modulation and demodulation system and method | |
| CN109765527B (en) | S-band multi-channel high-precision aerospace ranging responder | |
| CN112398506B (en) | Satellite-ground/relay integrated measurement and control system | |
| CN101702937B (en) | GNSS receiver and antenna system including a digital communication subsystem | |
| CN102611547B (en) | Intersatellite clock synchronizing system and method thereof | |
| CN110824507B (en) | Simulator of upper note receiving processor of navigation satellite | |
| CN108536003A (en) | Accurate time transmission system and method and time service service system | |
| CN108134625B (en) | Satellite bidirectional time frequency transmission method | |
| CN102866627B (en) | Beidou seamless high-precision time service implementation method and system | |
| CN105607079A (en) | Method for positioning precision enhancement of GNSS, and GNSS positioning system | |
| CN108254769B (en) | Navigation signal generation method of time division system | |
| CN103166670A (en) | Radio frequency transceiver of Beidou satellite navigation and positioning system | |
| CN106814374A (en) | A kind of reception device and method of GPS L5 signals | |
| CN104252000B (en) | The quick compensating circuit of a kind of Doppler based on DDS and method | |
| CN107707306A (en) | A kind of two-way time synchronism apparatus of high-precision optical fiber | |
| CN103792552A (en) | System and method for generating satellite navigation baseband signal | |
| CN105162490A (en) | Double-frequency measurement and control transmitting-receiving system | |
| CN105425262B (en) | It is a kind of to realize the method that satellite forwards navigation system carrier phase accurate measurement | |
| CN104579530A (en) | High-accuracy time unification and communication integrated device | |
| CN206421030U (en) | A kind of satellite navigation signal simulator | |
| CN114614882B (en) | Cn frequency band conduction integrated star-based receiving and transmitting terminal system | |
| CN102386851B (en) | Master-slave equipment system | |
| US20220116197A1 (en) | Time transfer modem | |
| RU166018U1 (en) | WATCH SYNCHRONIZATION DEVICE | |
| CN203233411U (en) | Radio frequency transceiver for Beidou satellite navigation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |