CN109194362A - A kind of compound text signal broadcast control method of dual rate - Google Patents
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Abstract
本发明涉及一种双速率复合电文信号播发控制方法，采用IQ两路正交调制，其中同相I支路上采用BPSK二进制相移键控载波调制，基带信号为经过DSSS直序扩频的基本电文；正交Q支路上采用BPSK二进制相移键控载波调制，基带信号为经过CSK码移键控调制的伪随机扩频序列，伪随机序列的码相位受播发的扩展电文控制；本发明由于将基本电文和扩展电文分别放在正交的IQ支路上，可以为电文速率不同的基本电文信号和扩展电文信号配置不同的功率比，提高了信号播发效率；由于基本电文信号与扩展电文信号扩频码不同且载波正交，只需接收基本电文的系统用户无需考虑扩展电文的存在，可以简化基本电文接收机的设计，降低基本电文接收机的成本。
The invention relates to a double-rate composite telegram signal broadcasting control method, which adopts IQ two-way quadrature modulation, wherein the in-phase I branch adopts BPSK binary phase shift keying carrier modulation, and the baseband signal is the basic telegram through DSSS direct sequence spread spectrum; The quadrature Q branch adopts BPSK binary phase shift keying carrier modulation, the baseband signal is a pseudo-random spread spectrum sequence modulated by CSK code shift keying, and the code phase of the pseudo-random sequence is controlled by the broadcast spread message; The message and the extended message are placed on the orthogonal IQ branches respectively, and different power ratios can be configured for the basic message signal and the extended message signal with different message rates, which improves the signal broadcasting efficiency; Different and orthogonal carriers, the system users who only need to receive the basic message do not need to consider the existence of the extended message, which can simplify the design of the basic message receiver and reduce the cost of the basic message receiver.
Description
Technical field
The present invention relates to a kind of compound text signal broadcast control methods of dual rate, belong to communication, navigation signal design skill
Art field.
Background technique
In contemporary communication, Navigation System Design, according to the difference of application demand, the signal in same frequency point is generally required
In broadcast the compound text for meeting different requirements simultaneously.Such as: broadcasting basic text by certain information rate, meet system and take substantially
The requirement of performance of being engaged in or open service performance, while the identical or different extension text of information rate is broadcast, it is additional to meet system
The requirement of service performance or non-public service performance.Due to extending telegraph signal not necessarily full disclosure, system requirements design
Compound telegraph signal, it is ensured that for basic text user in the case where not knowing to extend telegraph signal presence or absence, performance is fully
Receive the basic text in compound telegraph signal.
For the communication using DS spread spectrum signal system, navigation system, the rate for broadcasting text is generally less than spread spectrum
The inverse in code period.For example, the spreading code period of the GPS L1C/A code in the U.S. is 1ms, the rate of navigation message is 50bps [ginseng
Examine ICD-GPS-200C]；The spreading code period of WAAS satellite navigation satellite-based augmentation system is 1ms, and the rate of navigation message is
500sps [refers to RTCA DO-229D-2006].If promoting text broadcasts rate it is necessary to shorten the code length of spreading code, or
Polarity upset is multiple in one code period, can reduce correlation properties when signal is received and tracked in this way, damage signal acceptance
Energy.
On the other hand, the Japanese QZSS quasi- zenith satellite navigation system for broadcasting text for equally using CSK modulation system
System, in order to provide necessary spreading code chip and code cycle time information to CSK demodulation, QZSS system is broadcasting CSK modulation electricity
In the L6 signal of text, the dedicated pilot channel for not broadcasting text is devised, pilot channel signal and text broadcast signal using TDM
Time division multiplexing mode combination is broadcast in same carrier phase [with reference to IS-QZSS Ver.1.6].
Summary of the invention
Technical problem to be solved by the invention is to provide one kind can effectively solve the problem that communication, in navigation system application to more
The compound text signal broadcast control method of the dual rate of type text demand for services.
In order to solve the above-mentioned technical problem the present invention uses following technical scheme: it is compound that the present invention devises a kind of dual rate
Telegraph signal broadcasts control method, using IQ two-way orthogonal modulation, realizes broadcasting for the compound telegraph signal of dual rate；
Wherein, firstly, with phase I branch road, using default key modulation method, the expansion of DSSS direct sequence is carried out for basic text
Frequently, building is the same as phase I branch baseband signal；
Meanwhile orthogonal Q branch road is carried out CSK code for extension text and is moved keying tune using default key modulation method
System obtains pseudorandom spreading sequence, i.e., orthogonal Q branch baseband signal, wherein the code phase of pseudorandom spreading sequence is by extension electricity
Text control；
Then, it for same phase I branch baseband signal and orthogonal Q branch baseband signal, carries out IQ orthogonal modulation and obtains intermediate frequency
Carrier signal, then for intercarrier signal carry out upconversion process, obtain radio-frequency carrier signal, most afterwards through power amplification at
Reason constitutes the compound telegraph signal of dual rate, transmitting antenna is transferred to be broadcast.
As a preferred technical solution of the present invention: in the compound text signal broadcast method of dual rate, with phase I branch
On the road, as follows, building is the same as phase I branch baseband signal；
Firstly, carrying out the bit stream D after channel coding is encoded for basic textB(t)；
Then, basic text code cycle clock and Chip clock according to provided by timing sequencer, are expanded by basic text
Frequency code generator generates basic text spread spectrum codes CB(t), corresponding for obtained basic text using default key modulation method
Bit stream DB(t) band spectrum modulation is carried out, updating bit stream corresponding to basic text is CB(t)·DB(t)；
Finally, in conjunction with basic text power ratio coefficient A is presetI, by SI(t)=AI·CB(t)·DB(t), it obtains with phase I
Branch baseband signal SI(t)。
As a preferred technical solution of the present invention: in the compound text signal broadcast method of dual rate, orthogonal Q branch
On the road, as follows, orthogonal Q branch baseband signal is constructed；
Firstly, carrying out the bit stream after channel coding is encoded for extension text；
Then, serial/parallel conversion is carried out for bit stream corresponding to extension text, obtains parallel data stream；And according to when
Text code cycle clock is extended provided by sequence generator, it is inclined to obtain phase corresponding to parallel data stream as Selecting phasing module
Shifting amount；
Finally, extension text code cycle clock, Chip clock and parallel data stream according to provided by timing sequencer
Corresponding phase pushing figure, and by extension text spectrum-spreading code generator, using default key modulation method, for extension text
It carries out CSK code and moves keying modulation, obtain modulated extension text spread-spectrum code signalsAnd combine default extension text power
Stoichiometric factor AQ, pressObtain pseudorandom spreading sequence SQ(t), i.e., orthogonal Q branch baseband signal SQ(t),
Wherein, the code phase of pseudorandom spreading sequence is controlled by extension text, (AI)2+(AQ)2=1.
As a preferred technical solution of the present invention: the default key modulation method is BPSK binary phase shift keying
The multi-system signal modulation mode of carrier modulation or other congruence properties.
The compound text signal broadcast control method localization method of a kind of dual rate of the present invention uses above technical scheme
Compared with prior art, it has following technical effect that
The compound text signal broadcast control method of a kind of dual rate proposed by the present invention, using IQ two-way orthogonal modulation,
In with phase I branch road use BPSK binary phase shift keying carrier modulation, baseband signal is by the basic of DSSS direct sequence spread spectrum
Text；Orthogonal Q branch road uses BPSK binary phase shift keying carrier modulation, and baseband signal is to move keying modulation by CSK code
Pseudorandom spreading sequence, the code phase of pseudo-random sequence controlled by the extension text broadcast；It is identical in spread spectrum code length or period
Under conditions of, using CSK modulation system, text more higher than DSSS direct sequence spread spectrum can be obtained and broadcast rate；The present invention due to
Basic text and extension text are individually placed to orthogonal IQ branch road, can for the different basic telegraph signal of text rate and
Extension telegraph signal configures different power ratios, improves signal broadcast efficiency；Due to IQ path quadrature, carrier phase difference 90
Degree can effectively avoid influence of the powerful extension telegraph signal to basic telegraph signal receptivity；It is broadcast on I branch road
Bpsk signal may be either synchronizing information needed for Q branch provides CSK demodulation, and can effectively broadcast basic text；Due to substantially electric
Literary signal is different from extension telegraph signal spreading code and multicarrier orthogonal, the system user that need to only receive basic text expand without considering
The presence for opening up text, can simplify the design of basic text receiver, reduces the cost of basic text receiver.The method of the present invention
Suitable for fields such as communication, Navigation System Designs.
Detailed description of the invention
Fig. 1 is broadcasting method block diagram in the present invention design compound text signal broadcast control method of dual rate；
Fig. 2 is the sequential relationship of each component of I branch baseband signal；
Fig. 3 is the sequential relationship of each component of Q branch baseband signal；
Fig. 4 is the planisphere of complex base band signal；
Fig. 5 is basic telegraph signal receiving mechanism into figure；
Fig. 6 is compound text signal coherence receiving mechanism into figure；
Fig. 7 is compound text signal incoherent receiving mechanism into figure.
Specific embodiment
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawings of the specification.
The present invention devises a kind of compound text signal broadcast control method of dual rate, in practical application, such as Fig. 1 institute
Show, using IQ two-way orthogonal modulation, realizes broadcasting for the compound telegraph signal of dual rate.
Wherein, firstly, with phase I branch road, using default key modulation method, the expansion of DSSS direct sequence is carried out for basic text
Frequently, building is the same as phase I branch baseband signal.
Meanwhile orthogonal Q branch road is carried out CSK code for extension text and is moved keying tune using default key modulation method
System obtains pseudorandom spreading sequence, i.e., orthogonal Q branch baseband signal, wherein the code phase of pseudorandom spreading sequence is by extension electricity
Text control.
Building for above-mentioned same phase I branch baseband signal and orthogonal Q branch baseband signal, respectively by following each method
It realizes.
Wherein, the building for same phase I branch baseband signal devises two sets of methods, and one is as follows:
Firstly, carrying out the bit stream D after channel coding is encoded for basic textB(t)；
Then, basic text code cycle clock and Chip clock according to provided by timing sequencer, are expanded by basic text
Frequency code generator generates basic text spread spectrum codes CB(t), corresponding for obtained basic text using default key modulation method
Bit stream DB(t) band spectrum modulation is carried out, updating bit stream corresponding to basic text is CB(t)·DB(t)；
As shown in Fig. 2, giving the sequential relationship of each component of same phase I branch baseband signal, the information of basic text is through dividing
Group layout and channel coding after synthesis speed 1kHz, frame length 1s, value positive and negative 1 bit stream DB(t).Basic text spread spectrum codes CB
(t) bit rate 10.23MHz, period 1ms, value positive and negative 1.
Finally, in conjunction with basic text power ratio coefficient A is presetI, by SI(t)=AI·CB(t)·DB(t), it obtains with phase I
Branch baseband signal SI(t)。
Secondly as follows:
Firstly, carrying out the bit stream D after channel coding is encoded for basic textB(t)；
Then, basic text code cycle clock and Chip clock according to provided by timing sequencer, are expanded by basic text
Frequency code generator generates basic text spread spectrum codes CB(t), corresponding for obtained basic text using default key modulation method
Bit stream DB(t) band spectrum modulation is carried out, C is obtainedB(t) and DB(t) 2 He of mould in logic, updates bit corresponding to basic text
Stream is physical signal K (t) by 0 >+1,1 > -1 relationship map；
Finally, in conjunction with basic text power ratio coefficient A is presetI, by SI(t)=AIK (t) is obtained with phase I branch roadbed
Band signal SI(t)。
For the building of orthogonal Q branch baseband signal, the specific method is as follows:
Firstly, carrying out the bit stream after channel coding is encoded for extension text；
Then, serial/parallel conversion is carried out for bit stream corresponding to extension text, obtains parallel data stream；And according to when
Text code cycle clock is extended provided by sequence generator, it is inclined to obtain phase corresponding to parallel data stream as Selecting phasing module
Shifting amount；
As shown in figure 3, giving the sequential relationship of orthogonal each component of Q tributary signal, the grouped volume of information of text is extended
Row and synthesis speed NkHz, the Binary Zero of frame length 1s, 1 sequence D after channel codingE(t).Here, N is integer.It does not lose general
Property, illustrate conveniently, to set N=2 to be subsequent.Extend text spread-spectrum signal CE(t) bit rate 10.23MHz, period 1ms, value be just
Minus 1.Extend text spread-spectrum signal CE(t) expanded in the code phase of 1ms initial time (or starting chip) by the 2bit that preceding 1ms is generated
It opens up text and determines that table 1 is one embodiment of the present of invention, and phase corresponding relationship can be continuous, can not also connect by such as the following table 1
It is continuous, it can be incremented by, can also successively decrease.
Table 1
| DEValue (binary system) | CEPhase (decimal system) |
| 00 | 0 |
| 01 | 1 |
| 10 | 2 |
| 11 | 3 |
Finally, extension text code cycle clock, Chip clock and parallel data stream according to provided by timing sequencer
Corresponding phase pushing figure, and by extension text spectrum-spreading code generator, using default key modulation method, for extension text
It carries out CSK code and moves keying modulation, obtain modulated extension text spread-spectrum code signalsAnd combine default extension text power
Stoichiometric factor AQ, pressObtain pseudorandom spreading sequence SQ(t), i.e., orthogonal Q branch baseband signal SQ(t),
Wherein, the code phase of pseudorandom spreading sequence is controlled by extension text, (AI)2+(AQ)2=1.
As shown in figure 4, giving when settingWhen, the planisphere of complex base band signal only gives one here
A example, power ratio relationship corresponding relationship without being limited thereto.
In this example of the invention, the code length of extension text spreading code is 10230 chips.The selection of N is by 2N≤10230
Limitation, N maximum desirable 13, i.e., the maximum character rate that text is extended in this example is 13ksps.If extending text spreads sequence
Column the positive and negative overturning of each cycle 1 time again, the rate for extending text can be mentioned to 14ksps.Basic text and extension text channel are not considered
In the case where encoding variability, to guarantee to obtain same text demodulation performance, branch generally high to text rate in receiving end
Configure higher signal broadcast power.
Two branches use different spread spectrum code sequences.When text rate difference, IQ branch can distribute different hairs
Power is penetrated, so that basic text and extension text that receiving end receives have same receptivity.Broadcast signal IQ two-way
Spreading code keeps synchronous with text each other
Then for same phase I branch baseband signal SI(t) with orthogonal Q branch baseband signal SQ(t) complex expression is as follows:
S (t)=SI(t)+jSQ(t)
Wherein, j is imaginary number.
Default key modulation method mentioned in the above method be BPSK binary phase shift keying carrier modulation or other
The multi-system signal modulation mode of congruence property.
Then, it for same phase I branch baseband signal and orthogonal Q branch baseband signal, carries out IQ orthogonal modulation and obtains intermediate frequency
Carrier signal, then for intercarrier signal carry out upconversion process, obtain radio-frequency carrier signal, most afterwards through power amplification at
Reason constitutes the compound telegraph signal of dual rate, transmitting antenna is transferred to be broadcast.
Here the radio frequency transmissions of the compound telegraph signal of dual rate are expressed as follows:
Wherein, PsIndicate compound text emission of radio frequency signals general power, fcIndicate emission signal frequency.
The present invention designs in the compound text signal broadcast control method of dual rate, and basic text and extension text are put respectively
On orthogonal IQ branch road, the power that broadcasts rate only and need to be promoted extension telegraph signal of extension text is promoted, signal is improved
Broadcast efficiency；IQ path quadrature, carrier phase differ 90 degree, can effectively avoid powerful extension telegraph signal to basic text
The influence of signal receiving performance；The bpsk signal broadcast on I branch road may be either that Q branch provides synchronous letter needed for CSK demodulation
Breath, and can effectively broadcast basic text.
For the compound text signal broadcast method of dual rate of above-mentioned design, the present invention further devises composite signal and connects
Basic text method of reseptance in receiving method, including the compound telegraph signal of dual rate, coherent demodulation in the compound telegraph signal of dual rate
It extends non-coherent demodulation in text method of reseptance and the compound telegraph signal of dual rate and extends text method of reseptance；Wherein, double speed
Basic text method of reseptance in the compound telegraph signal of rate, as follows as shown in Figure 5:
The received radio-frequency carrier signal of receiver antenna exports intercarrier signal, intercarrier signal by radio-frequency channel
It samples to obtain digital medium-frequency signal by AD；Carrier frequency mixing of the digital medium-frequency signal first with carrier wave circle replication obtains I branch road
Mixing results signal i and Q branch road mixing results signal q；Then, mixing results signal i and Q the branch road of I branch road
Mixing results signal q replicated respectively with code ring it is advanced, carry out related calculation immediately with three parts of spreading codes of lag, obtain related
As a result iE、iP、iL、qE、qP、qL；Then, correlated results iE、iP、iL、qE、qP、qLAfter integrated-remover, output is relevant respectively
Integrated value IE、IP、IL、QE、QP、QL；After again, the coherent integration value I of instant branch roadPAnd QPIt is taken as the defeated of carrier wave ring discriminator
Enter, carrier wave ring discriminator exports driscrimination error φe, and the coherent integration value in other two associated branch is then used as code ring to identify
The input of device, code ring discriminator output phase difference δcp；Finally, carrier wave ring and code ring are respectively to their discriminator output valve
φeAnd δcpIt is filtered, and filter result is used to adjust the output phase and frequency of respective carrier wave NCO and code NCO, make carrier wave
The carrier wave that ring is replicated is consistent with carrier wave is received, and is made the i.e. time-code of the spreading code of yard circle replication and received spreading code guarantor
It holds and unanimously guarantees that subsequent time receives the carrier wave in signal and spreading code is still thoroughly removed in track loop；Carrier wave simultaneously
Ring discriminator exports the basic telegraph text data bit demodulated.
Coherent demodulation extends text method of reseptance in the compound telegraph signal of dual rate, as follows as shown in Figure 6:
When demodulating basic text, the spreading code chip time and 1 period synchronous with signal is received are obtained afterwards by synchronizing
Spreading code initial time passes to extension text spectrum-spreading code generator and coherent matched filter module；Text spreading code is extended to occur
The mixing results signal q of spreading code and Q branch road that device generates carries out matched filtering, and matched filtering result is exported searches to relevant peaks
Rope module, relevant peaks search module export extension telegraph text data bit according to search result.
Non-coherent demodulation extends text method of reseptance in the compound telegraph signal of dual rate, as follows as shown in Figure 7:
When demodulating basic text, the spreading code chip time and 1 period synchronous with signal is received are obtained afterwards by synchronizing
Spreading code initial time passes to extension text spectrum-spreading code generator and incoherent matched filtering module；Extend text spreading code hair
The mixing results signal q of the mixing results signal i and Q branch road of spreading code and I branch road that raw device generates carries out incoherent
With filtering, matched filtering result, which exports, gives relevant peaks search module, and relevant peaks search module exports extension electricity according to search result
Literary data bit.
In aforementioned present invention example, basic text bit width is equal to basic text spreading code period, extension text spread spectrum
The code period is equal to the basic text spreading code period, this is an application example of the invention, basic text bit width, basic
Text spreading code period, extension text spreading code period can be set to any relationship of coherent synchronization each other
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode within the knowledge of a person skilled in the art can also be without departing from the purpose of the present invention
It makes a variety of changes.
Claims (4)
1. a kind of compound text signal broadcast control method of dual rate, it is characterised in that: apply IQ two-way orthogonal modulation, realize double
The compound telegraph signal of rate is broadcast；
Wherein, firstly, with phase I branch road, using default key modulation method, DSSS direct sequence spread spectrum is carried out for basic text,
Building is the same as phase I branch baseband signal；
Meanwhile orthogonal Q branch road is carried out CSK code for extension text and moves keying modulation, obtained using default key modulation method
Obtain pseudorandom spreading sequence, i.e., orthogonal Q branch baseband signal, wherein the code phase of pseudorandom spreading sequence is by extension text control
System；
Then, it for same phase I branch baseband signal and orthogonal Q branch baseband signal, carries out IQ orthogonal modulation and obtains IF carrier
Signal, then upconversion process is carried out for intercarrier signal, radio-frequency carrier signal is obtained, is most handled afterwards through power amplification, structure
At dual rate compound electric text signal, transmitting antenna is transferred to be broadcast.
2. the compound text signal broadcast control method of a kind of dual rate according to claim 1, it is characterised in that: described double
In the compound text signal broadcast method of rate, constructed as follows with phase I branch baseband signal with phase I branch road；
Firstly, carrying out the bit stream D after channel coding is encoded for basic textB(t)；
Then, basic text code cycle clock and Chip clock according to provided by timing sequencer, by basic text spreading code
Generator generates basic text spread spectrum codes CB(t), using default key modulation method, for the corresponding bit of obtained basic text
Flow DB(t) band spectrum modulation is carried out, updating bit stream corresponding to basic text is CB(t)·DB(t)；
Finally, in conjunction with basic text power ratio coefficient A is presetI, by SI(t)=AI·CB(t)·DB(t), it obtains with phase I branch
Baseband signal SI(t)。
3. the compound text signal broadcast control method of a kind of dual rate according to claim 1, it is characterised in that: described double
In the compound text signal broadcast method of rate, orthogonal Q branch road as follows, constructs orthogonal Q branch baseband signal；
Firstly, carrying out the bit stream after channel coding is encoded for extension text；
Then, serial/parallel conversion is carried out for bit stream corresponding to extension text, obtains parallel data stream；And it is sent out according to timing
Text code cycle clock is extended provided by raw device, phase offset corresponding to parallel data stream is obtained as Selecting phasing module
Amount；
Finally, extension text code cycle clock, Chip clock according to provided by timing sequencer and parallel data stream institute are right
The phase pushing figure answered, and carried out using default key modulation method for extension text by extension text spectrum-spreading code generator
CSK code moves keying modulation, obtains modulated extension text spread-spectrum code signalsAnd combine default extension text power ratio
Coefficient AQ, pressObtain pseudorandom spreading sequence SQ(t), i.e., orthogonal Q branch baseband signal SQ(t),
In, the code phase of pseudorandom spreading sequence is controlled by extension text, (AI)2+(AQ)2=1.
4. the compound text signal broadcast control method of a kind of dual rate according to claim 1, it is characterised in that: described pre-
If key modulation method is BPSK binary phase shift keying carrier modulation or the multi-system signal modulation side of other congruence properties
Formula.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110244328A (en) * | 2019-05-28 | 2019-09-17 | 西安空间无线电技术研究所 | A kind of navigation enhancement signal modulation method and system |
| CN110275189A (en) * | 2019-05-28 | 2019-09-24 | 西安空间无线电技术研究所 | A chip time division navigation signal modulation method and system with mixed information rate |
| CN111045031A (en) * | 2019-12-05 | 2020-04-21 | 航天恒星科技有限公司 | SBAS message automatic arranging method and device and storage medium |
| CN112020830A (en) * | 2019-12-18 | 2020-12-01 | 航天恒星科技有限公司 | Method and device for broadcasting text signal based on phase discontinuous R-CSK modulation |
| CN112105958A (en) * | 2020-07-03 | 2020-12-18 | 航天恒星科技有限公司 | Bipolar CSK modulation composite telegraph text signal broadcasting method and device |
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| CN110244328A (en) * | 2019-05-28 | 2019-09-17 | 西安空间无线电技术研究所 | A kind of navigation enhancement signal modulation method and system |
| CN110275189A (en) * | 2019-05-28 | 2019-09-24 | 西安空间无线电技术研究所 | A chip time division navigation signal modulation method and system with mixed information rate |
| CN110244328B (en) * | 2019-05-28 | 2021-03-26 | 西安空间无线电技术研究所 | A kind of navigation enhancement signal modulation method and system |
| CN110275189B (en) * | 2019-05-28 | 2021-11-16 | 西安空间无线电技术研究所 | Method and system for modulating chip time division navigation signal of mixed information rate |
| CN111045031A (en) * | 2019-12-05 | 2020-04-21 | 航天恒星科技有限公司 | SBAS message automatic arranging method and device and storage medium |
| CN111045031B (en) * | 2019-12-05 | 2022-03-18 | 航天恒星科技有限公司 | SBAS message automatic arranging method and device and storage medium |
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| WO2021120027A1 (en) * | 2019-12-18 | 2021-06-24 | 航天恒星科技有限公司 | Message signal broadcasting method and device employing phase discontinuity r-csk modulation |
| CN112020830B (en) * | 2019-12-18 | 2022-03-04 | 航天恒星科技有限公司 | Telegraph text signal broadcasting method and device based on phase discontinuous R-CSK modulation |
| CN112105958A (en) * | 2020-07-03 | 2020-12-18 | 航天恒星科技有限公司 | Bipolar CSK modulation composite telegraph text signal broadcasting method and device |
| WO2022000442A1 (en) * | 2020-07-03 | 2022-01-06 | 航天恒星科技有限公司 | Bipolar csk modulation-based composite message signal broadcasting method and apparatus |
| CN112105958B (en) * | 2020-07-03 | 2023-09-29 | 航天恒星科技有限公司 | Bipolar CSK modulation composite text signal broadcasting method and device |
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