CN106572045A - Modulation system of satellite time comparison equivalence bandwidth synthesis signal and method thereof - Google Patents
Modulation system of satellite time comparison equivalence bandwidth synthesis signal and method thereof Download PDFInfo
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- CN106572045A CN106572045A CN201610856754.6A CN201610856754A CN106572045A CN 106572045 A CN106572045 A CN 106572045A CN 201610856754 A CN201610856754 A CN 201610856754A CN 106572045 A CN106572045 A CN 106572045A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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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
- 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
- G01S19/02—Details of the space or ground control segments
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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
- 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
- G01S19/13—Receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
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Abstract
The invention discloses a modulation system of a satellite time comparison equivalence bandwidth synthesis signal. The system comprises a reference frequency module, a measured data generation module, a spread spectrum signal generation module, a subcarrier signal generation module and a synthesis signal generation module, wherein the reference frequency module is used for generating a reference frequency and a second pulse signal; the measured data generation module is used for converting floating point type data measured through time comparison into binary data, and carrying out error correction coding on the binary data so as to acquire a binary signal; the spread spectrum signal generation module is used for generating a spreading code signal and combining with the binary signal so as to acquire a spread spectrum signal; the subcarrier signal generation module is used for generating a subcarrier signal; and the synthesis signal generation module is used for generating an equivalent bandwidth synthesis signal according to the spread spectrum signal and the subcarrier signal. The invention simultaneously discloses a modulation method of the satellite time comparison equivalence bandwidth synthesis signal. In the invention, the equivalent bandwidth synthesis signal formed through synthesizing the two signals is provided so that a problem that a bandwidth is increased because satellite bidirectional signal time comparison precision is increased is solved.
Description
Technical field
The present invention relates to Two Way Satellite Time Transfer is to field.Equivalent bandwidth is compared more particularly, to a kind of satellite time
The modulating system and method for composite signal.
Background technology
Two Way Satellite Time Transfer to be current internationally recognized full accuracy Time transfer receiver method, be widely used in the world
Split-second precision frequency value long-range comparing, passes in temporal frequency amount and be can not be substituted with the status in source tracing method.Satellite is two-way
Time transfer receiver using signal spread-spectrum modulation technique the relevant information of up timing signal is carried out high-precision band spectrum modulation send out
Penetrate, by real-time forwarding of the satellite-ground link to signal, compare station carries out fast Acquisition, precision tracking and essence to descending comparison signal
Really resolve, obtain signal transmission delay, by exchanging propagation delay data the time difference compared between station just can be accurately obtained
Information.
Traditional satellite two-way pumping station signal is mainly using the modulation system of binary phase shift keying (BPSK), Time transfer receiver
Accuracy limitations are in nanosecond order.The certainty of measurement of BPSK time signals depends on the acuity of its auto-correlation function, related letter
The more sharp time resolution of number is higher, and it is double so as to lift satellite to increase the acuteness of correlation function by increasing spreading rate
To precision of time comparison, but this kind of mode can cause the bandwidth shared by signal to be significantly increased, so that user is to satellite frequency
The selection of section brings difficulty, while the rent star expense of user is greatly increased.Therefore, need to provide a kind of in the lifting satellite two-way time
The signal modulation feature for preventing bandwidth to be significantly increased while comparison accuracy, solves to be led due to increasing the acuteness of correlation function
The problem that the signal bandwidth of cause increases.
The content of the invention
In order to solve problem above, the invention provides a kind of satellite time compares the modulation system of equivalent bandwidth composite signal
System and method, can effectively lift the precision of Two Way Satellite Time Transfer pair, while solving classical signal modulation system to carry
The problem that the signal bandwidth that high Two Way Satellite Time Transfer is caused to precision is significantly increased.
To reach above-mentioned purpose, the present invention adopts following technical proposals：
One aspect of the present invention discloses the modulating system that a kind of satellite time compares equivalent bandwidth composite signal, and its feature exists
In, including：
Reference frequency module：For generating reference frequency, and pps pulse per second signal is produced according to the reference frequency；
Measurement data generation module：For on the basis of the pps pulse per second signal, by the floating-point of satellite time matching measurement
Type data are converted to binary data, and carry out Error Correction of Coding to the binary data, obtain binary signal；
Spread-spectrum signal generation module：It is raw so as on the basis of the pps pulse per second signal for carrying out frequency multiplication to reference frequency
Into spread-spectrum code signals, and spread-spectrum signal is obtained according to the spread-spectrum code signals and the binary signal；
Sub-carrier signal generation module：For carrying out frequency multiplication to reference frequency, on the basis of the pps pulse per second signal, generate
Sub-carrier signal；
Composite signal generation module：For generating equivalent bandwidth synthesis according to the spread-spectrum signal and the sub-carrier signal
Signal.
Preferably, the reference frequency module includes reference frequency generator and pulse per second (PPS) generator, the reference frequency
Generator is used to provide base for the measurement data generation module, the spread-spectrum signal generation module and the pulse per second (PPS) generator
Quasi- frequency, the pulse per second (PPS) generator is used to receive the reference frequency, produces pps pulse per second signal.
Preferably, the measurement data generation module includes frequency divider and information data maker, and the frequency divider is used for
The reference frequency is received, process obtains information frame pulse control signal, and described information Data Generator is used for according to the letter
The real-coded GA of satellite time matching measurement is converted to binary data by breath frame pulse control signal, and to the binary system
Data carry out Error Correction of Coding, obtain binary signal.
Preferably, the spread-spectrum signal generation module includes the first doubler, spread spectrum code generator and the first multiplier, institute
The first doubler is stated for receiving the reference frequency, spread-spectrum code rate is generated, while the reference frequency is exported to described
Sub-carrier signal generation module, the spread spectrum code generator is used to receive the spread-spectrum code rate, generates spread-spectrum code signals, described
First multiplier is used to receive the spread-spectrum code signals, and multiplication behaviour is carried out with the binary signal to the spread-spectrum code signals
Make, produce spread-spectrum signal.
Preferably, first doubler is used to generate the spread-spectrum code rate that frequency is the reference frequency integral multiple.
Preferably, the sub-carrier signal generation module includes the second doubler and subcarrier maker, described second times
Frequency device is used to receive the reference frequency of the spread-spectrum signal generation module transmission, generates sub-carrier rate, the subcarrier
Maker is used to receive the sub-carrier rate, generates sine-shaped sub-carrier signal.
Preferably, second doubler is used to generate the sub-carrier rate that frequency is the reference frequency integral multiple.
Preferably, the composite signal generation module includes the second multiplier, and second multiplier is used to receive described
Spread-spectrum signal and the sub-carrier signal, multiplication operation is carried out to the spread-spectrum signal and the sub-carrier signal, is generated equivalent
Bandwidth composite signal.
Preferably, the composite signal generation module is used to generate signal power positioned at carrier frequency both sides away from carrier frequency
The equivalent bandwidth composite signal of 1 times of center subcarrier frequency width position.
Another aspect of the present invention also discloses the modulator approach that a kind of satellite time compares equivalent bandwidth composite signal, its
It is characterised by, comprises the following steps：
S1：Reference frequency is generated, and pps pulse per second signal is produced according to the reference frequency；
S2：On the basis of the pps pulse per second signal, the real-coded GA of satellite time matching measurement is converted to into binary system
Data, and Error Correction of Coding is carried out to the binary data, obtain binary signal；
S3：Frequency multiplication is carried out to reference frequency, so as on the basis of the pps pulse per second signal, generate spread-spectrum code signals, according to
The binary signal and the spread-spectrum code signals obtain spread-spectrum signal；
S4：Frequency multiplication is carried out to reference frequency, so as on the basis of the pps pulse per second signal, generate sub-carrier signal；
S5：Equivalent bandwidth composite signal is obtained according to the spread-spectrum signal and the sub-carrier signal.
Beneficial effects of the present invention are as follows：
The invention provides a kind of equivalent bandwidth composite signal synthesized by two signals, when satellite two-way signaling is lifted
Between comparison accuracy while solve it is two-way to lift the satellite that causes to precision of Two Way Satellite Time Transfer in conventional manner
The problem that Time transfer receiver signal bandwidth is increased considerably.
Description of the drawings
The specific embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 shows that a kind of satellite time disclosed by the invention compares the structure of the modulating system of equivalent bandwidth composite signal
Schematic diagram.
Fig. 2 shows that the modulating system that a kind of satellite time disclosed by the invention compares equivalent bandwidth composite signal is preferably real
Apply the structural representation of example.
Fig. 3 shows that satellite time compares the oscillogram of each signal in equivalent bandwidth composite signal modulated process.
Fig. 4 shows that a kind of satellite time disclosed by the invention compares the flow process of the modulator approach of equivalent bandwidth composite signal
Figure.
Specific embodiment
In order to be illustrated more clearly that the present invention, the present invention is done further with reference to preferred embodiments and drawings
It is bright.Similar part is indicated with identical reference in accompanying drawing.It will be appreciated by those skilled in the art that below institute is concrete
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
As shown in figure 1, one aspect of the present invention discloses the modulation system that a kind of satellite time compares equivalent bandwidth composite signal
System, including：
Reference frequency module：For generating reference frequency, and pps pulse per second signal is produced according to the reference frequency, it may include
Reference frequency generator 1 and pulse per second (PPS) generator 2, the reference frequency generator 1 be used for for the measurement data generation module,
The spread-spectrum signal generation module and the pulse per second (PPS) generator 2 provide reference frequency, and the pulse per second (PPS) generator 2 is used to receive
The reference frequency, produces pps pulse per second signal.
Measurement data generation module：For on the basis of the pps pulse per second signal, by the floating-point of satellite time matching measurement
Type data are converted to binary data, and carry out Error Correction of Coding to the binary data, obtain binary signal, it may include point
Frequency device 3 and information data maker 4, the frequency divider 3 is used to receive the reference frequency, and process obtains information frame Pulse Width Control
Signal, described information Data Generator 4 is used for the floating satellite time matching measurement according to described information frame pulse control signal
Point-type data are converted to binary data, and carry out Error Correction of Coding to the binary data, obtain binary signal.
Spread-spectrum signal generation module：It is raw on the basis of the pps pulse per second signal, carrying out frequency conversion to reference frequency
Into spread-spectrum code signals, and spread-spectrum signal is obtained according to the spread-spectrum code signals and the binary signal, it may include the first frequency multiplication
Device 5, the spread spectrum multiplier 7 of code generator 6 and first, first doubler 5 is used to receive the reference frequency, generates spreading code
Speed, the spread spectrum code generator 6 can be used to receive the spread-spectrum code rate, generate spread-spectrum code signals, first multiplier 7
Can be used to receive the spread-spectrum code signals, multiplication operation carried out with the binary signal to the spread-spectrum code signals, it is preferred that
The spread-spectrum code rate is the integral multiple of the reference frequency；
Sub-carrier signal generation module：For on the basis of the pps pulse per second signal, to reference frequency frequency conversion being carried out,
Generate sub-carrier signal, it may include the second doubler 8 and subcarrier maker 9, second doubler 8 can be used to receive described
The reference frequency of spread-spectrum signal generation module transmission, generates sub-carrier rate, and the subcarrier maker 9 can be used to receive
The sub-carrier rate, generates sine-shaped sub-carrier signal, it is preferred that the sub-carrier rate is the reference frequency
Integral multiple；
Composite signal generation module：For generating equivalent bandwidth composite signal according to spread-spectrum signal and sub-carrier signal, can
Including the second multiplier 10, second multiplier 10 can be used to receive the spread-spectrum signal and the sub-carrier signal, to institute
Stating spread-spectrum signal and the sub-carrier signal carries out multiplication operation, generates equivalent bandwidth composite signal.
The modulating system of the two-way Time transfer receiver equivalent bandwidth composite signal is used for an altofrequency sine wave signal
As the sub-carrier signal used in modulated process, the sub-carrier signal is carried out into two with low-frequency spread-spectrum signal has been modulated
Secondary modulation, so as to generate equivalent bandwidth composite signal.The equivalent bandwidth composite signal includes signal spectrum and main carrier frequency,
The signal spectrum is divided into two parts, is respectively distributed to the main carrier frequency both sides, and its structure is mainly characterized in that signal power
Main carrier frequency both sides is transferred to apart from the wide position of 1 times of main carrier frequency center subcarrier frequency, is on the one hand realized using two
Little bandwidth signal synthesizes the equivalent synthesis of a big bandwidth signal, reduces signal and uses bandwidth, on the other hand this signal phase
Than the acuity that traditional BP SK improves signal auto-correlation function, time resolution is improved.
As shown in Figures 2 and 3, in the course of work of preferred embodiment, first, the reference frequency of reference frequency module occurs
Device 1 sends reference frequency, is that measurement data generation module, spread-spectrum signal generation module and pulse per second (PPS) generator 2 provide benchmark frequency
Rate, the benchmark frequency of the pulse per second (PPS) generator 2 is counted, and when counting reaches reference frequency, pulse per second (PPS) generator 2 is produced
Raw pps pulse per second signal, while count resetting, counts again, and when reaching reference frequency again, pulse per second (PPS) generator 2 produces again the second
Pulse signal, so circulation, produce continuous pps pulse per second signal.
The frequency divider 3 of measurement data generation module receives the reference frequency of reference frequency module transmission, processes the benchmark
Frequency obtains information frame pulse control signal, and described information frame pulse control signal is transferred to into information data maker 4, described
Information data maker 4 is converted to the real-coded GA of satellite time matching measurement according to described information frame pulse control signal
Binary data, and Error Correction of Coding is carried out to the binary data by the way of Turbo Error Corrections of Coding, obtain binary system letter
Number, and by the Binary Signal Transmission to the spread-spectrum signal generation module, the generation of the binary signal is with pulse per second (PPS)
Signal synchronizes triggering.
First doubler 5 of spread-spectrum signal generation module receives the reference frequency, and to the reference frequency frequency multiplication is carried out,
The corresponding frequency of spread-spectrum code signals, i.e. spread-spectrum code rate are obtained, the spread-spectrum code rate is the integral multiple of the reference frequency.Expand
A series of memory storage in frequency code maker 6 spread spectrum code sequence of binary bits, the spread spectrum code sequence is stored as
Form, with data of the spread-spectrum code rate according to beat from the form of storage spread spectrum code sequence reading is searched one by one
Generation binary spread code signal is taken, the spread-spectrum code signals are transferred to first multiplier 7 by spread spectrum code generator 6, the
One binary signal of multiplier 7 pairs and the binary spread code signal carry out binary multiplication operations, produce spread spectrum letter
Number, and by the spread spectrum signal transmitting to the composite signal generation module.
Second doubler 8 of sub-carrier signal generation module receives the reference frequency of the spread spectrum module transmission, right
The reference frequency carries out frequency multiplication, obtains the corresponding frequency of sub-carrier signal, i.e. sub-carrier rate, and the sub-carrier rate is institute
State the integral multiple of reference frequency.The subcarrier maker 9 of the sub-carrier signal generation module includes sinusoidal wave memory, described
Sine wave memory storage has the sinusoidal wave form of a cycle, and the sinusoidal wave form is stored in table form, with the frequency for producing
Rate signal is searched one by one according to the data that beat is stored from form reads the sub-carrier signal for producing sine wave, the son
The generation of carrier signal synchronizes triggering with pps pulse per second signal.The subcarrier maker 9 transmits the sub-carrier signal
To the composite signal generation module.
The second multiplier 10 in composite signal generation module receives the spread-spectrum signal and the sub-carrier signal, and right
The spread-spectrum signal and the sub-carrier signal carry out multiplication operation, obtain equivalent bandwidth composite signal.Using the equivalent band
Wide composite signal can improve the precision of Two Way Satellite Time Transfer pair, and the equivalent bandwidth composite signal is synthesized by two signals
The relatively large signal of a bandwidth, but increasing considerably for bandwidth is not resulted in, so that Two Way Satellite Time Transfer is to mistake
Cheng Gengjia is convenient, also reduces cost of use and cost.
Another aspect of the present invention also discloses a kind of satellite two-way pumping station equivalent bandwidth synthesis letter using the system
Number modulator approach, as shown in figure 4, in a preferred embodiment, comprise the following steps：
S1：Reference frequency is generated, and pps pulse per second signal is produced according to the reference frequency.By the base of reference frequency module
Quasi- frequency generator 1 sends reference frequency, is measurement data generation module, spread-spectrum signal generation module and pulse per second (PPS) generator 2
Reference frequency is provided, the benchmark frequency of the pulse per second (PPS) generator 2 is counted, when counting reaches reference frequency, second arteries and veins
Rush generator 2 and produce pps pulse per second signal, while count resetting, count again, when reaching reference frequency again, pulse per second (PPS) generator
2 produce again pps pulse per second signal, so circulation, produce continuous pps pulse per second signal.
S2：On the basis of the pps pulse per second signal, the real-coded GA of satellite time matching measurement is converted to into binary system
Data, and Error Correction of Coding is carried out to the binary data, obtain binary signal.By the frequency dividing of measurement data generation module
Device 3 receives the reference frequency of reference frequency module transmission, processes the reference frequency and obtains information frame pulse control signal, by institute
State information frame pulse control signal and be transferred to information data maker 4, described information Data Generator 4 is according to described information frame arteries and veins
Rush control signal and the real-coded GA of satellite time matching measurement is converted to into binary data, and using Turbo Error Corrections of Coding
Mode Error Correction of Coding is carried out to the binary data, obtain binary signal, and by the Binary Signal Transmission to institute
Spread-spectrum signal generation module is stated, the generation of the binary signal synchronizes triggering with pps pulse per second signal.
S3：Frequency multiplication is carried out to reference frequency, so as on the basis of the pps pulse per second signal, generate spread-spectrum code signals, according to
The binary signal and the spread-spectrum code signals obtain spread-spectrum signal.By the first doubler 5 of spread-spectrum signal generation module
The reference frequency is received, and frequency multiplication is carried out to the reference frequency, obtain the corresponding frequency of spread-spectrum code signals, i.e. spreading code speed
Rate, the spread-spectrum code rate is the integral multiple of the reference frequency.Memory storage a series of two in spread spectrum code generator 6
The spread spectrum code sequence of system bit, the spread spectrum code sequence is stored as form, with the spread-spectrum code rate according to beat from
Data in the form of storage spread spectrum code sequence are searched one by one reading and are produced binary spread code signal, spread code generator
The spread-spectrum code signals are transferred to first multiplier 7 by 6, and the first binary signal of multiplier 7 pairs and described two enter
Spread-spectrum code signals processed carry out binary multiplication operations, produce spread-spectrum signal, and by the spread spectrum signal transmitting to the synthesis letter
Number generation module.
S4：Frequency multiplication is carried out to reference frequency, so as on the basis of the pps pulse per second signal, generate sub-carrier signal.Pass through
Second doubler 8 of sub-carrier signal generation module receives the reference frequency of the spread spectrum module transmission, to the benchmark
Frequency carries out frequency multiplication, obtains the corresponding frequency of sub-carrier signal, i.e. sub-carrier rate, and the sub-carrier rate is benchmark frequency
The integral multiple of rate.The subcarrier maker 9 of the sub-carrier signal generation module includes sinusoidal wave memory, and the sine wave is deposited
Reservoir is stored with the sinusoidal wave form of a cycle, and the sinusoidal wave form is stored in table form, pressed with the frequency signal for producing
Searched one by one according to the data that beat is stored from form and read the sub-carrier signal for producing sine wave, the sub-carrier signal
Generation triggering is synchronized with pps pulse per second signal.The subcarrier maker 9 transmits the sub-carrier signal to the conjunction
Into signal generation module.
S5：Equivalent bandwidth composite signal is obtained according to the spread-spectrum signal and the sub-carrier signal.By composite signal
The second multiplier 10 in generation module receives the spread-spectrum signal and the sub-carrier signal, and to the spread-spectrum signal and institute
Stating sub-carrier signal carries out multiplication operation, obtains equivalent bandwidth composite signal.
Carrying out Two Way Satellite Time Transfer pair using the equivalent bandwidth composite signal can improve Two Way Satellite Time Transfer pair
Precision, and the equivalent bandwidth composite signal is the relatively large signal of the bandwidth synthesized by two signals, is not resulted in
Increasing considerably for bandwidth, so that Two Way Satellite Time Transfer is more convenient to process, also reduces cost of use and cost.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not right
The restriction of embodiments of the present invention, for those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms, all of embodiment cannot be exhaustive here, it is every to belong to this
Obvious change that bright technical scheme is extended out changes row still in protection scope of the present invention.
Claims (10)
1. a kind of satellite time compares the modulating system of equivalent bandwidth composite signal, it is characterised in that include：
Reference frequency module：For generating reference frequency, and pps pulse per second signal is produced according to the reference frequency；
Measurement data generation module：For on the basis of the pps pulse per second signal, by the floating type number of satellite time matching measurement
According to being converted to binary data, and Error Correction of Coding is carried out to the binary data, obtain binary signal；
Spread-spectrum signal generation module：For carrying out frequency multiplication to reference frequency, so as on the basis of the pps pulse per second signal, generating and expand
Frequency code signal, and obtain spread-spectrum signal according to the spread-spectrum code signals and the binary signal；
Sub-carrier signal generation module：For carrying out frequency multiplication to reference frequency, on the basis of the pps pulse per second signal, generate son and carry
Ripple signal；
Composite signal generation module：For generating equivalent bandwidth synthesis letter according to the spread-spectrum signal and the sub-carrier signal
Number.
2. system according to claim 1, it is characterised in that the reference frequency module includes reference frequency generator and second
Pulse generator, the reference frequency generator is used to be the measurement data generation module, the spread-spectrum signal generation module
Reference frequency is provided with the pulse per second (PPS) generator, the pulse per second (PPS) generator is used to receive the reference frequency, produces second arteries and veins
Rush signal.
3. system according to claim 1, it is characterised in that the measurement data generation module includes frequency divider and Information Number
According to maker, the frequency divider is used to receive the reference frequency, and process obtains information frame pulse control signal, described information number
It is used to that the real-coded GA of satellite time matching measurement is converted to into two according to described information frame pulse control signal according to maker
Binary data, and Error Correction of Coding is carried out to the binary data, obtain binary signal.
4. system according to claim 1, it is characterised in that the spread-spectrum signal generation module includes the first doubler, expands
Frequency code maker and the first multiplier, first doubler is used to receive the reference frequency, generates spread-spectrum code rate, while
The reference frequency is exported to the sub-carrier signal generation module, the spread spectrum code generator is used to receive the spreading code
Speed, generates spread-spectrum code signals, and first multiplier is used to receive the spread-spectrum code signals, to the spread-spectrum code signals and institute
Stating binary signal carries out multiplication operation, produces spread-spectrum signal.
5. system according to claim 4, it is characterised in that first doubler is used to generate frequency for benchmark frequency
The spread-spectrum code rate of rate integral multiple.
6. system according to claim 1, it is characterised in that the sub-carrier signal generation module include the second doubler and
Subcarrier maker, second doubler is used to receive the reference frequency of the spread-spectrum signal generation module transmission, raw
Into sub-carrier rate, the subcarrier maker is used to receive the sub-carrier rate, generates sine-shaped sub-carrier signal.
7. system according to claim 6, it is characterised in that second doubler is used to generate frequency for benchmark frequency
The sub-carrier rate of rate integral multiple.
8. system according to claim 1, it is characterised in that the composite signal generation module includes the second multiplier, institute
The second multiplier is stated for receiving the spread-spectrum signal and the sub-carrier signal, to the spread-spectrum signal and subcarrier letter
Multiplication operation number is carried out, equivalent bandwidth composite signal is generated.
9. system according to claim 1, it is characterised in that the composite signal generation module is used to generate signal power position
In equivalent bandwidth composite signal of the carrier frequency both sides away from 1 times of carrier frequency center subcarrier frequency width position.
10. a kind of satellite time compares the modulator approach of equivalent bandwidth composite signal, it is characterised in that comprise the following steps：
S1：Reference frequency is generated, and pps pulse per second signal is produced according to the reference frequency；
S2：On the basis of the pps pulse per second signal, the real-coded GA of satellite time matching measurement is converted to into binary data,
And Error Correction of Coding is carried out to the binary data, obtain binary signal；
S3：Frequency multiplication is carried out to reference frequency, so that on the basis of the pps pulse per second signal, spread-spectrum code signals are generated, according to described
Binary signal and the spread-spectrum code signals obtain spread-spectrum signal；
S4：Frequency multiplication is carried out to reference frequency, so as on the basis of the pps pulse per second signal, generate sub-carrier signal；
S5：Equivalent bandwidth composite signal is obtained according to the spread-spectrum signal and the sub-carrier signal.
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| CN107817480A (en) * | 2017-10-25 | 2018-03-20 | 中国电子科技集团公司第五十四研究所 | A kind of Time transfer receiver measurement apparatus and method |
| CN108111216A (en) * | 2017-12-11 | 2018-06-01 | 北京无线电计量测试研究所 | A kind of tracks of device for New System satellite two-way equivalent bandwidth composite signal |
| CN110471094A (en) * | 2019-07-17 | 2019-11-19 | 中国电子科技集团公司第五十四研究所 | It is a kind of to digitize the time Compare System and comparison method handled in real time |
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| CN108111216A (en) * | 2017-12-11 | 2018-06-01 | 北京无线电计量测试研究所 | A kind of tracks of device for New System satellite two-way equivalent bandwidth composite signal |
| CN110471094A (en) * | 2019-07-17 | 2019-11-19 | 中国电子科技集团公司第五十四研究所 | It is a kind of to digitize the time Compare System and comparison method handled in real time |
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