WO2012139458A1 - 一种导航信号调制方法 - Google Patents
一种导航信号调制方法 Download PDFInfo
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- WO2012139458A1 WO2012139458A1 PCT/CN2012/073075 CN2012073075W WO2012139458A1 WO 2012139458 A1 WO2012139458 A1 WO 2012139458A1 CN 2012073075 W CN2012073075 W CN 2012073075W WO 2012139458 A1 WO2012139458 A1 WO 2012139458A1
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- signal
- branch
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- modulation
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
-
- 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
-
- 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
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/26—Demodulation of angle-, frequency- or phase- modulated oscillations by means of sloping amplitude/frequency characteristic of tuned or reactive circuit
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L23/00—Apparatus or local circuits for systems other than those covered by groups H04L15/00 - H04L21/00
- H04L23/02—Apparatus or local circuits for systems other than those covered by groups H04L15/00 - H04L21/00 adapted for orthogonal signalling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2215/00—Reducing interference at the transmission system level
- H04B2215/064—Reduction of clock or synthesizer reference frequency harmonics
- H04B2215/065—Reduction of clock or synthesizer reference frequency harmonics by changing the frequency of clock or reference frequency
Definitions
- the present invention relates to the field of signal system design and signal generation in satellite navigation systems, and in particular to a constant envelope modulation method for navigation signals carrying different services on the upper and lower sidebands.
- the signal system is the core of the satellite navigation system and determines the innate performance of the navigation system. If the signal system design is flawed, even if the equipment of the ground segment, space segment and user segment is better, the performance of the system will still be congenital, hindering the promotion and application of the navigation system.
- the modulation method is the focus of the navigation signal system research.
- modulation mode design is the focus of the industry.
- the satellite navigation signal modulation has been extended by the BPSK modulation adopted by the first generation GPS to the coexistence of various new modulation modes such as BOC, CBOC, TMBOC and AltBOC.
- the AltBOC modulation mode has the ability to carry different services in the upper and lower sidebands, and can independently receive and process single sideband signals to achieve the performance of traditional BPSK signals, or can be jointly processed to achieve higher positioning accuracy, which has been adopted by the COMPASS global system.
- AltBOC is a BOC-like modulation method in which upper and lower sidebands can modulate different pseudo-codes. Its concept was first proposed in 2000 to meet the need to share a high-amplitude transmission of two navigation signals in the El and E2 bands. However, due to the non-constant envelope problem and the signal planning adjustment of the L1 band, the AltBOC modulation method is not used in the L1 band.
- the French Space Agency (CNES) proposed a 4-pseudo-code constant envelope AltBOC modulation method, which was adopted as the modulation method for the Galileo E5a and E5b band navigation signals.
- AltBOC (15,10) modulation with a center frequency of 1191.795MHz is adopted.
- the center frequency of the lower sideband is 1176.45MHz, and the center frequency of the upper sideband is 1207.14MHz.
- the interoperability of GalileoE5 and GPSL5C signals can also be compatible with the B2 signal of the COMPASS regional system.
- Galileo's AltBOC modulation method increases the slew rate of the baseband waveform to 8 times the subcarrier, the number of subcarriers is increased to 4 levels, and the product term is inserted.
- the increase in the baseband slew rate and the number of subcarrier levels will undoubtedly increase the complexity of signal generation and reception.
- the introduction of the product term reduces the multiplexing efficiency and reduces the signal performance to some extent.
- An object of the present invention is to provide a navigation signal modulation method which has the advantages of flexible signal reception processing, higher multiplexing efficiency, and low signal generation and reception processing complexity.
- the control clock CLK0 is divided to obtain a pseudo code to generate a drive clock CLK1 and a time division multiplex control clock CLK2, and the frequency of the control clock CLK0 is 4 times the binary subcarrier frequency, and the pseudo code generates a drive clock CLK1 at a code rate. 1/2, the frequency division of the time division multiplexing control clock CLK2 is equivalent to the code rate;
- the CLK1 driver generates an upper sideband data channel pseudo code c BD , a lower sideband data channel pseudo code CAD, and a pilot channel pseudo code c P
- the CLK0 driver generates a binary sinusoidal subcarrier SC B , sin and a binary cosine subcarrier SC B , Ras;
- the lower sideband data d A modulates the CAD to obtain the lower sideband data channel baseband signal component C A ;
- the upper sideband data waveform d B modulates c BD to obtain the upper sideband data channel baseband signal component C B ;
- the step (4) queries the corresponding baseband signal in the modulation mapping table according to the current C A , C B and C P values.
- the modulation mapping table is constructed by: combining all possible C A , C B and C P values, according to steps (41) to (43) for each combination Processing, obtaining the baseband signal Q branch component and the baseband signal I branch component corresponding to each combination, recording each combination and its corresponding Q branch component and I branch component, and constructing a modulation mapping table.
- a modulation system implementing the navigation signal modulation method including
- a first multiplier 3 a first subtractor 4, a second multiplier 7, a first time division multiplexer 11 that are sequentially connected, and a fourth multiplier 2, a second adder 5, and a fifth that are sequentially connected a multiplier 8, a second time division multiplexer 12; and a seventh multiplier 6 and an eighth multiplier 9 that are sequentially connected;
- a pseudo code generator 1 that connects the first multiplier 3, the fourth multiplier 2, and the seventh multiplier 6, respectively; and a first frequency divider 17 that connects the pseudo code generator 1;
- a subcarrier generator connecting the second multiplier 7, the fifth multiplier 8 and the fifth multiplier 9 respectively; and a second frequency divider connecting the first time division multiplexer 11 and the second time division multiplexer 12, respectively 18;
- the first multiplier 3 is connected to the second adder 5, the fourth multiplier 2 is connected to the first subtractor 4, and the eighth multiplier 9 is connected to the second time division multiplexer 12, the first time division multiplexing And the second time division multiplexer 12 is connected to the radio frequency modulator, and the first time division multiplexer 11 further receives a zero signal input;
- a modulation system implementing the navigation signal modulation method including
- the connected frequency divider 24 and the pseudo code generator 19, the pseudo code generator 19 is connected to the first input end of the baseband modulation module 26 via the first exclusive OR device 20, and the pseudo code generator 19 is connected by the second exclusive OR device 21.
- the second input of the baseband modulation module 26, the pseudocode generator 19 is also coupled to the third input of the baseband modulation module 26, and the two outputs of the TD-AltBOC baseband modulation module 26 are coupled to the radio frequency modulator.
- the time domain characteristics of the TD-AltBOC modulated signal of the present invention are as follows.
- the I and Q branch baseband waveforms are determined by the upper sideband data channel pseudocode C BD and the lower sideband data channel pseudocode.
- the baseband waveform of the TD-AltBOC modulated signal is shown in Figure 5.
- the TD_AltB0C (15, 10) modulated baseband signal waveform is shown in Figure 5.
- the power spectrum of the TD-AltBOC modulated signal consists of two main lobes.
- the peak of one main lobe is located at the carrier frequency plus the subcarrier frequency, mainly the upper sideband signal component, and the peak of the other main lobe is located at the carrier frequency minus the subcarrier frequency. Where, mainly the lower sideband signal component.
- the normalized power spectrum of the TD-AltBOC (15,10) modulated signal is shown in Figure 6.
- the TD-AltBOC modulated signal has good reception flexibility.
- the upper sideband signal can be regarded as a BPSK (Rc) modulated signal whose center frequency value is equal to the carrier frequency plus the subcarrier frequency
- the lower sideband signal can be regarded as a BPSK (Rc) modulated signal whose center frequency value is equal to the carrier frequency minus the subcarrier frequency.
- the upper and lower sideband signals can be received separately to obtain the reception performance equivalent to BPSK (Rc); the upper and lower sideband signals can also be jointly received to obtain the reception performance equivalent to B0C (fs, Rc).
- the TD-AltBOC modulated signal has a 100% multiplexing efficiency.
- the constant envelope multiplexing of the four signal components of the upper and lower sidebands is realized, and no product signal component is introduced, and there is no multiplexing loss.
- the upper and lower side pilot channels of TD-AltBOC share pseudo-code, and the double-side band joint reception is equivalent to cosine B0C modulation.
- the number of pseudo-code generators and correlators required for pilot signal tracking can be reduced by half; TD- AltBOC's subcarrier symbol conversion rate is four times the subcarrier frequency, while AltBOC's subcarrier symbol conversion rate is eight times the subcarrier frequency, and the baseband processing rate required for signal generation is reduced by half.
- the subcarrier waveform of TD-AltBOC is 2 level, AltBOC subcarrier waveform is 4 level, the hardware resource consumed by a single correlator is lower when matching is received; the data channel and pilot channel of TD-AltBOC modulated signal appear time-division, some consume large hardware resources Basic units (such as multipliers) can implement time-sharing multiplexing to improve resource utilization and reduce hardware resource consumption. Therefore, the TD-AltBOC signal generation and reception complexity is much lower than the AltBOC signal.
- Figure 3 shows the TD-AltBOC modulation signal generation implementation.
- Figure 4 shows the TD-AltBOC modulation constellation and signal waveform.
- the invention solves the constant envelope modulation problem of the 4 signal by combining the chip-by-chip time division multiplexing mode and the 2-signal AltBOC modulation mode, and is named as the time division AltBOC mode, abbreviated as TD-AltBOC.
- TD-AltBOC time division AltBOC mode
- m represents a multiple of the subcarrier frequency relative to the reference frequency fD
- ie f s mxf 0
- n represents a multiple of the code rate relative to the reference frequency fD
- ie R c n xf 0 .
- TD-AltBOC modulation divides the signal transmission time into odd and even time slots, the time slot width is equal to the pseudo code chip width, the odd time slot transmits the upper and lower sideband data channel signal components, and the even time slot transmits the upper and lower sidebands. Pilot channel signal component.
- the timing relationship of signal component transmission is shown in Figure 1.
- B2b_D represents the upper sideband data channel signal component
- B2b_P represents the upper sideband pilot channel signal component
- B2a_D represents the lower sideband data channel signal component
- B2a_P represents the lower sideband pilot channel signal component.
- the waveform is the lower side data channel pseudo code waveform, the lower side data channel pseudo code waveform, the data bit waveform modulated by the upper side data channel, c BD W is the upper side data channel pseudo code waveform, and the upper side data channel pseudo code Waveform, . ) is a binary cosine subcarrier, ⁇ ⁇ ⁇ ) is a binary sinusoidal subcarrier.
- c BD (t) ⁇ ⁇ C BD ⁇ k)p ⁇ t- ⁇ 2N BD l + 2k)T c )
- c BP (t) ⁇ ⁇ C BP ⁇ k)p ⁇ t- ⁇ 2N BP + 2k + ⁇ )T c )
- N AD , N AP , N BD , N BP are the code lengths of C ⁇ , C AP , C AP , C SP , 7 : pseudo code chip width, p (for rectangular pulse, indicator Number operation, / s is the subcarrier frequency (B2 signal is 15X1.023MHz). p (defined as follows
- C A and C s respectively represent a lower sideband pseudo code and an upper sideband pseudo code transmitted in a certain time slot.
- C A d A C AD
- C B d B C BD
- C A G AP
- C B G BP
- the signal waveform drawn by the solid line is the in-phase branch waveform
- the signal waveform drawn by the broken line is the orthogonal branch waveform.
- time slots may only have binary cosine subcarriers on the in-phase branch.
- the present invention adopts the same TD-AltBOC scheme with upper and lower sideband pilot channel pseudo-codes.
- the clock with 4 times the subcarrier frequency is used as the unified control clock signal CLK0 generated by the TD-AltBOC baseband signal.
- control clock is divided by a frequency divider 17 to generate a pseudo-code generator drive clock CLK1;
- the output of the multiplier 6 is passed through a multiplier 9 and a binary cosine subcarrier SC B , e . Multiplying s to obtain the signal component of the pilot channel in the I branch, and note that the signal component of the pilot channel in the Q branch is always 0;
- the output of the adder 5 is passed through a multiplier 8 and a binary cosine subcarrier SC B , e . Multiplying s to obtain the signal component of the data channel in the I branch;
- the output of the adder 4 is multiplied by the binary sinusoidal subcarriers SC B , sin by the multiplier 7 to obtain the signal component of the data channel in the Q branch; 12) taking the output of the multiplier 7 and 0 as two inputs of the time division multiplexer 11;
- the baseband clock CLK0 is divided by a frequency divider by 18 to obtain a time division multiplexer control clock CLK2;
- the time division multiplexer 11 and the time division multiplexer 12 complete the synchronous switching of the data channel and the pilot channel.
- the time division multiplexer 11 When in the odd digital chip time slot, the time division multiplexer 11 outputs the data channel at The signal component of the Q branch, the time division multiplexer 12 outputs the signal component of the data channel in the I branch; when in the even digital chip time slot, the time division multiplexer 11 outputs 0, and the time division multiplexer 12 outputs the pilot channel.
- the output of the time division multiplexer 11 is the Q-branch signal component of the composite signal
- the output of the time division multiplexer 12 is the I-branch signal component of the composite signal.
- the TD-AltBOC modulated radio frequency signal is obtained by combining the Q branch component and the I branch component of the radio frequency signal.
- the multipliers 13 and 14 and the adder 15 together constitute a radio frequency modulator, and the present invention is not limited to this form, and a dedicated QPSK modulator can also be used to implement radio frequency modulation, and the number of divisions of the frequency dividers 17 and 18 is also Not limited to the frequency division number mentioned in this example, when the subcarrier frequency and code rate control parameters are changed, the frequency division numbers of the frequency dividers 17 and 18 should be changed accordingly, and the frequency division number of the frequency divider 17 is 8*. m/n, the frequency division number of the frequency divider 18 is 4*m/n.
- the clock CLK00 is divided by 12 by the frequency divider to divide by 12, which is used as the driving clock of the pseudo code generator;
- the pseudo code generator generates the upper sideband data channel pseudo code C BD , the lower sideband data channel pseudo code CAD and the pilot channel pseudo code C P at half the code rate Rc ; unlike the method shown in FIG. 2, the method outputs
- the pseudo code sequence takes a value of 0 or 1, corresponding to 1 and -1 of the method shown in Figure 2;
- the lookup table unit 26 includes a modulation map composed of an I branch lookup table and a Q branch lookup table, as shown in Tables 1 and 2, respectively.
- Tables 1 and 2 are based on the principle of subcarrier modulation in Figure 2, that is, combining all possible C A , C B and CP values, and performing the same subcarrier modulation for each combination to obtain the baseband corresponding to each combination.
- the signal Q branch component and the baseband signal I branch component are recorded, and each combination and its corresponding Q branch component and I branch component are recorded, and a modulation map is constructed.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP12771513.4A EP2698959B1 (en) | 2011-04-15 | 2012-03-27 | Method for modulating navigation signal |
| CA2841334A CA2841334C (en) | 2011-04-15 | 2012-03-27 | Method for modulating navigation signal |
| US14/123,232 US9020072B2 (en) | 2011-04-15 | 2012-03-27 | Method for modulating navigation signal |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110094974.7 | 2011-04-15 | ||
| CN2011100949747A CN102209056B (zh) | 2011-04-15 | 2011-04-15 | 一种导航信号调制方法 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012139458A1 true WO2012139458A1 (zh) | 2012-10-18 |
Family
ID=44697724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2012/073075 Ceased WO2012139458A1 (zh) | 2011-04-15 | 2012-03-27 | 一种导航信号调制方法 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9020072B2 (zh) |
| EP (1) | EP2698959B1 (zh) |
| CN (1) | CN102209056B (zh) |
| CA (1) | CA2841334C (zh) |
| WO (1) | WO2012139458A1 (zh) |
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| CN103944844A (zh) * | 2014-04-15 | 2014-07-23 | 中国航空无线电电子研究所 | 一种信标信号与数据信号融合的方法 |
| CN114265096A (zh) * | 2021-12-17 | 2022-04-01 | 首都体育学院 | 一种卫星导航接收机的跟踪模块多通道分时复用方法 |
| CN114578394A (zh) * | 2022-03-10 | 2022-06-03 | 清华大学 | 信号跟踪方法和信号跟踪装置 |
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| CN102209056B (zh) * | 2011-04-15 | 2013-06-19 | 华中科技大学 | 一种导航信号调制方法 |
| CN102694569B (zh) | 2012-06-07 | 2014-05-14 | 清华大学 | 导航信号的恒包络复用方法、生成装置以及接收方法 |
| CN103023598B (zh) | 2012-11-23 | 2016-03-30 | 清华大学 | 双频四分量扩频信号的恒包络复用方法、装置及接收方法 |
| CN103439718B (zh) * | 2013-08-08 | 2015-05-20 | 华中科技大学 | 一种高阶boc调制信号的无模糊跟踪单元 |
| CN104702311B (zh) | 2013-12-06 | 2017-08-11 | 清华大学 | 扩频信号的生成方法、生成装置、接收方法和接收装置 |
| CN103616699B (zh) * | 2013-12-11 | 2015-11-11 | 上海交通大学 | 基于最小频移键控脉冲的二进制编码符号优化调制方法 |
| DE102013114832B3 (de) * | 2013-12-23 | 2015-01-08 | Intel IP Corporation | Verfahren, Basisbandsignalgenerator und Computerprogramm zum Bereitstellen eines Basisbandsignals |
| CN104052701B (zh) * | 2014-06-03 | 2018-01-19 | 哈尔滨工程大学 | 一种基于fpga实现的脉内调制特征实时提取与分类系统 |
| CN105049392B (zh) * | 2015-08-21 | 2018-12-21 | 武汉导航与位置服务工业技术研究院有限责任公司 | 信号生成方法及装置 |
| CN105589083A (zh) * | 2015-12-04 | 2016-05-18 | 航天恒星科技有限公司 | 导航卫星定位解算方法及装置 |
| CN105717519B (zh) * | 2016-02-17 | 2018-09-18 | 西安空间无线电技术研究所 | 一种卫星导航信号信道scb特性检测方法 |
| CN106803818B (zh) * | 2016-12-08 | 2020-07-28 | 华中科技大学 | 一种TD-AltBOC信号的接收方法和装置 |
| CN109581436B (zh) * | 2017-09-28 | 2021-10-12 | 清华大学 | 相邻频点导航信号联合接收机和接收方法 |
| US10742257B1 (en) | 2018-09-26 | 2020-08-11 | Novatel Inc. | System and method for demodulating code shift keying data from a satellite signal utilizing a binary search |
| US10742258B1 (en) * | 2018-09-26 | 2020-08-11 | Novatel Inc. | System and method for demodulating code shift keying data utilizing correlations with combinational PRN codes generated for different bit positions |
| CN111025349A (zh) * | 2018-10-09 | 2020-04-17 | 泰斗微电子科技有限公司 | Boc信号解调方法及其芯片、设备 |
| CN109581431B (zh) * | 2018-11-06 | 2023-02-17 | 北京理工雷科空天信息技术有限公司 | 一种双边带二进制偏移载波跟踪方法 |
| CN110275189B (zh) * | 2019-05-28 | 2021-11-16 | 西安空间无线电技术研究所 | 一种混合信息速率的码片时分导航信号调制方法及系统 |
| CN112039570B (zh) * | 2020-08-13 | 2023-11-03 | 上海道生物联技术有限公司 | 一种导频发送和检测方法、发送端及接收端 |
| CN112305565B (zh) * | 2020-10-26 | 2024-01-26 | 中国科学院空天信息创新研究院 | B1c认证信号生成方法、装置、电子设备及存储介质 |
| CN112764065B (zh) * | 2020-12-08 | 2024-05-07 | 北京无线电计量测试研究所 | 一种oqpsk卫星双向时间比对信号频率同步方法 |
| CN117590446B (zh) * | 2024-01-16 | 2024-04-12 | 北京凯芯微科技有限公司 | 宽带复合导航信号跟踪方法及装置 |
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-
2011
- 2011-04-15 CN CN2011100949747A patent/CN102209056B/zh not_active Expired - Fee Related
-
2012
- 2012-03-27 CA CA2841334A patent/CA2841334C/en not_active Expired - Fee Related
- 2012-03-27 EP EP12771513.4A patent/EP2698959B1/en not_active Not-in-force
- 2012-03-27 WO PCT/CN2012/073075 patent/WO2012139458A1/zh not_active Ceased
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103944844A (zh) * | 2014-04-15 | 2014-07-23 | 中国航空无线电电子研究所 | 一种信标信号与数据信号融合的方法 |
| CN114265096A (zh) * | 2021-12-17 | 2022-04-01 | 首都体育学院 | 一种卫星导航接收机的跟踪模块多通道分时复用方法 |
| CN114578394A (zh) * | 2022-03-10 | 2022-06-03 | 清华大学 | 信号跟踪方法和信号跟踪装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102209056B (zh) | 2013-06-19 |
| EP2698959A4 (en) | 2014-09-24 |
| US9020072B2 (en) | 2015-04-28 |
| US20140219393A1 (en) | 2014-08-07 |
| CA2841334A1 (en) | 2012-10-18 |
| EP2698959B1 (en) | 2017-09-06 |
| CN102209056A (zh) | 2011-10-05 |
| CA2841334C (en) | 2020-07-21 |
| EP2698959A1 (en) | 2014-02-19 |
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