CN114137583B - Navigation communication integrated signal design method based on satellite platform - Google Patents
Navigation communication integrated signal design method based on satellite platform Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 27
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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
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
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- 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
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Abstract
The invention discloses a navigation communication integrated signal design method based on a satellite platform, which combines a navigation ranging signal, a navigation text signal and a communication data signal together, and increases the capability of a satellite for transmitting communication data to a user while providing navigation capability for the user. The scheme is that the base band signals of a navigation ranging branch signal, a navigation text branch signal and a communication data branch signal are respectively generated, and then the base band signals of the three branches are subjected to constant envelope modulation by using the same frequency point and are transmitted. The method not only can improve the frequency resource utilization efficiency of the satellite, but also can enable the modulated combined signal to have constant envelope characteristics, reduce the peak-to-average ratio of the signal and reduce the nonlinear distortion caused by the signal after passing through the satellite power amplifier. Signal waveform distortion caused by nonlinear distortion can be eliminated in the time domain, and side lobe of a transmission power spectrum cannot be increased in the frequency domain, so that interference to adjacent frequency bands is reduced.
Description
Technical Field
The invention belongs to the technical field of communication, relates to signal design in the technical field of satellite navigation and communication, in particular to a navigation communication integrated signal design method based on a satellite platform, which can be used for providing a signal design method with constant envelope characteristics for a satellite navigation communication integrated system.
Background
The global satellite navigation system (Global Navigation SATELLITE SYSTEM, GNSS) is an air-based radio navigation positioning system capable of providing all-weather 3-dimensional coordinates and velocity and time information to a user at any location on the earth's surface or near-earth space. There are now 4 large satellite navigation system suppliers worldwide, the global satellite positioning system in the united states (Globe Position System, GPS), russian glonass (Global Navigation SATELLITE SYSTEM, GLONASS), european Galileo (Galileo) and china's beidou satellite navigation system (BeiDou Navigation SATELLITE SYSTEM, BDS).
In recent years, convergence of navigation communication has been explored, both for military use and for civil use, and a new navigation system that integrates communication and navigation has been emerging. Compared with other mainstream navigation systems, the Beidou satellite navigation system in China has the greatest characteristic that active positioning and short message feature services are combined, and the system design combining communication and navigation functions is realized, so that the Beidou satellite navigation system is a unique invention of the Beidou satellite navigation system and is also a great advantage. However, the frequency of short message service usage in Beidou satellite navigation systems: the downlink (space to ground) uses 2483.5-2500MHz frequency band, and the uplink (ground to space) uses 1610-1626.5MHz frequency band, which is different from the frequency band used by the Beidou satellite navigation system navigation service. That is, the Beidou satellite navigation system only concentrates the navigation and communication functions in one system, and the two systems use different frequency points, so that more frequency resources are occupied by the system. The combined signal obtained by directly multiplexing multiple signals (more than three paths) with one frequency point may result in a signal that does not have a constant envelope characteristic, which may cause nonlinear distortion when the signal passes through a satellite power amplifier. Nonlinear distortion can cause signal waveform distortion in the time domain, and can cause the increase of transmission power spectrum sidelobes in the frequency domain, thereby causing interference to adjacent frequency bands.
Disclosure of Invention
Aiming at the defects or shortcomings of the prior art, the invention aims to provide a navigation communication integrated signal design method based on a satellite platform.
In order to achieve the above task, the present invention adopts the following technical solutions:
a navigation communication integrated signal design method based on a satellite platform is characterized in that the method combines a navigation ranging signal, a navigation message signal and a communication data signal together, and constant envelope modulation transmission is carried out by using the same frequency point; the method specifically comprises the following steps:
Step 1: generating a navigation ranging branch baseband signal S 1 (t):
(1) Inputting a spread spectrum code stream of a navigation ranging branch, wherein the spread spectrum code stream is a0 sequence and a1 sequence;
(2) Performing polarity conversion on the values of the 0 sequence chip and the 1 sequence chip of the spread spectrum code stream of the navigation ranging branch, wherein 0 is converted into 1, and 1 is converted into-1;
Step 2: generating a navigation message branch baseband signal S 2 (t):
(1) Inputting a navigation message branch data bit stream, wherein the data bit stream is a 0, 1 sequence;
(2) Channel coding is carried out on navigation message data, and framing is carried out according to the message frame format requirement;
(3) Performing mode two sum operation on the coded navigation message data and the spread spectrum code to realize spread spectrum processing;
(4) Performing polarity conversion on the 0, 1 sequence chip values after the spread spectrum of the navigation message data, wherein 0 is converted into 1, and 1 is converted into-1;
step 3: generating a communication data branch baseband signal S 3 (t):
(1) Inputting a communication data branch data bit stream, wherein the data bit stream is a 0, 1 sequence;
(2) Channel coding is carried out on communication data, and framing is carried out according to the frame format requirement of the communication data;
(3) Performing mode two sum operation on the coded communication data and the spread spectrum code to realize spread spectrum processing;
(4) Performing polarity conversion on the 0,1 chip value after the communication data spread spectrum, wherein 0 is converted into 1, and 1 is converted into-1;
Step 4: fixing the modulation coefficient theta 1 of the navigation ranging branch baseband signal S 1 (t) to pi/2, and calculating the modulation coefficient theta 2 of the navigation text branch baseband signal S 2 (t) and the communication data branch baseband signal S 3
Modulation factor θ 3 of (t):
(1) According to the power ratio alpha 2 of the preset navigation text branch baseband signal S 2 (t) and the navigation ranging branch baseband signal S 1 (t), the modulation factor theta 2 of the navigation text branch baseband signal S 2 (t) is calculated according to the following formula:
(2) According to the power ratio alpha 3 of the preset communication data branch baseband signal S 3 (t) and the navigation ranging branch baseband signal S' 1 (t); the communication data branch baseband signal S 3 (t) modulation factor θ 3 is calculated as follows:
Step 5, respectively generating I, Q roadbed band signals:
(1) I the baseband signal I (t) is derived from the following formula:
I(t)＝S2(t)sinθ2cosθ3+S3(t)cosθ2sinθ3
(2) The Q baseband signal Q (t) is derived from:
Q(t)＝S1(t)cosθ2cosθ3-S1(t)S2(t)S3(t)sinθ2sinθ3
Step 6: and respectively carrying out carrier modulation on the baseband signals I (t) and Q (t), namely multiplying the carriers with the same frequency and the initial phase difference pi/2 by the following formula to obtain an I-path radio frequency signal S I (t) and a Q-path radio frequency signal S Q (t) after carrier modulation:
SI(t)＝I(t)cos(2πfct)
SQ(t)＝Q(t)sin(2πfct)
Wherein f c is the carrier frequency;
Step 7: adding S I (t) and S Q (t) to obtain a transmitted on integrated signal radio frequency combined signal S (t):
S(t)＝SI(t)+SQ(t)
And finally, transmitting S (t) into the channel through a signal transmitter.
The integrated navigation communication signal design method based on the satellite platform adopts a signal design scheme of combining three signals of a navigation ranging signal, a navigation text signal and a communication data signal, so that the frequency resource utilization efficiency of a system is improved, the modulated signal can be made to have constant envelope characteristics, the peak-to-average ratio of the signal is reduced, and the influence of nonlinear distortion caused by a power amplifier is reduced. Compared with the prior art, the method has the following advantages:
Firstly, the integrated design of navigation signals and communication signals is carried out based on a satellite platform, the communication data broadcasting function from satellite to user is added while the navigation function is provided for the user, and the integrated design can be used for application occasions such as high-precision enhancement service of a satellite navigation system.
Secondly, the communication signals and the navigation signals are transmitted by using the same frequency point, and compared with the communication data signals in the existing navigation system, the design mode that the navigation signals (ranging and telegraph text) respectively use different frequency points improves the frequency band utilization rate and saves the frequency band resources.
Thirdly, constant envelope modulation is carried out on three signals, namely navigation ranging, navigation message and communication data, to be transmitted, so that the peak-to-average ratio of the signals can be reduced, and the influence of nonlinear distortion caused by a power amplifier is reduced. The signal waveform distortion caused by nonlinear distortion can be eliminated from the time domain, and the side lobe of the transmission power spectrum can not be increased from the frequency domain, so that the interference to adjacent frequency bands is reduced.
Drawings
FIG. 1 is a signal generation flow chart of a navigation communication integrated signal design method based on a satellite platform of the invention;
FIG. 2 is a schematic diagram of a navigation message data channel coding and frame structure of the integrated signal design method for navigation communication based on a satellite platform of the present invention;
FIG. 3 is a schematic diagram of a communication data channel coding and frame structure of the integrated navigation communication signal design method based on the satellite platform of the present invention;
FIG. 4 is a time domain waveform diagram of an I baseband signal I (t) of the integrated navigation communication signal design method based on a satellite platform of the present invention;
FIG. 5 is a time domain waveform diagram of a Q baseband signal Q (t) of the satellite platform based navigation communication integrated signal design method of the present invention;
FIG. 6 is a time domain waveform diagram of an I-channel RF signal S I (t) of the integrated navigation communication signal design method based on the satellite platform of the present invention;
FIG. 7 is a time domain waveform diagram of a Q-channel RF signal S Q (t) of the integrated navigation communication signal design method based on the satellite platform of the present invention;
FIG. 8 is a time domain waveform diagram of a radio frequency combined signal S (t) of the integrated navigation communication signal design method based on the satellite platform of the present invention;
Fig. 9 is a waveform diagram of a baseband combined signal envelope of the integrated signal design method for navigation communication based on the satellite platform.
The invention is described in further detail below with reference to the drawings and examples.
Detailed Description
The embodiment provides a navigation communication integrated signal design method based on a satellite platform, the method is described by taking a power ratio alpha 2 =1/3 of a navigation text branch signal S 2 (t) and a navigation ranging branch signal S 1 (t), a power ratio alpha 3 =4/3 of a communication data branch baseband signal S' 3 (t) and a navigation ranging branch signal S 1 (t) as an example, a navigation text data bit rate is 50bps, a communication data channel data bit rate is 250bps, a navigation ranging code, a navigation text signal and a communication data signal spread spectrum code length 10230, a spread spectrum code rate is 5.115MHz, and a carrier wave transmitting frequency is f c = 5022.93MHz, and the specific implementation steps are as follows:
Step 1: generating a navigation ranging branch baseband signal S 1 (t):
(1) A navigation ranging branch spread spectrum code stream (0, 1 sequence) with a code length of 10230 and a code rate of 5.115MHz is input;
(2) And performing polarity conversion on the 0,1 chip values of the spread spectrum code stream of the navigation ranging branch, wherein 0 is converted into 1, and 1 is converted into-1.
Step 2: generating a navigation message branch baseband signal S 2 (t):
(1) A navigation message branch data stream (0, 1 sequence) with the input bit rate of 50 bps;
(2) The navigation message data is subjected to channel coding and is framed according to the message frame format requirement, as shown in fig. 2, each navigation message frame consists of a frame synchronization code, message information data and a CRC check code, wherein the frame synchronization code is 13-bit barker code, namely 1111100110101. 463-bit text information data of each text subframe uses a 24-bit CRC check algorithm to calculate a 24-bit CRC check code, and the 24-bit CRC check code generator polynomial is:
Wherein/>
The message information data and CRC check code total 487 bits are combined with 5 bit filling bit [ 01 01 0] and error correction coding is carried out by LDPC (984, 492) with code rate of 1/2, so as to obtain 984 code symbols. The encoded message includes a 13-bit frame synchronization code, a 984-bit message information symbol, and a 3-bit fill symbol [ 01 ] and a frame synchronization code. The coded message symbol rate is 100sps.
(3) The coded navigation message data is spread, the code length of a message data branch spread spectrum code is 10230, the code rate is 5.115MHz, and the spread spectrum processing is that 1 message symbol and a spread spectrum code sequence with 5 period lengths are subjected to modulo two sum operation.
(4) And carrying out polarity conversion on the 0 and 1 chip values after the navigation message data is spread, wherein 0 is converted into 1, and 1 is converted into-1.
Step 3: generating a communication data branch baseband signal S 3 (t):
(1) A communication data tributary data stream (0, 1 sequence) with an input data bit rate of 250 bps;
(2) The communication data is channel coded and framed according to the communication data frame format requirement, as shown in fig. 3, each communication data frame is composed of a frame synchronization code, a communication data block 1 and a CRC1 check code, and a communication data block 2 and a CRC2 check code.
The frame synchronization code is a 13-bit barker code, i.e., 111110010101.
The 56 bits of data of the communication data block 1 use 8-bit CRC check algorithm to calculate 8-bit CRC1 check code, and the total of 64 bits of communication data and CRC check code; error correction coding is performed by using LDPC (128, 64) with code rate of 1/2, and 128 code symbols are obtained. The 8-bit CRC check code generator polynomial is x 8+x2 +x+1.
The 400-bit data of the communication data block 2 uses a 16-bit CRC check algorithm to calculate a 16-bit CRC2 check code, and the total of the communication data and the CRC check code is 416 bits; error correction coding is performed by using LDPC codes (832, 416) with the code rate of 1/2, and 832 code symbols are obtained. The 16-bit CRC check code generator polynomial is x 16+x12+x5 +1.
The encoded communication data includes 13-bit frame synchronization codes, 128-bit communication data block 1 symbols, and 832-bit communication data block 2 symbols. The encoded text symbol rate is 500sps.
(3) The coded communication data is spread, the code length of a communication data branch spread code is 10230, the code rate is 5.115MHz, and the spread spectrum processing is that 1 communication data symbol and a spread spectrum code sequence with 1 period length are subjected to a mode two and operation.
(4) And performing polarity conversion on the 0,1 chip value after the communication data is spread, wherein 0 is converted into 1, and 1 is converted into-1.
Step 4: fixing the modulation factor theta 1 of the navigation ranging branch baseband signal S 1 (t) to pi/2, and calculating the modulation factor theta 2 of the navigation text branch baseband signal S 2 (t) and the modulation factor theta 3 of the communication data branch baseband signal S 3 (t):
(1) Substituting the power ratio α 2 =1/3 of the preset navigation message branch baseband signal S 2 (t) and the navigation ranging branch baseband signal S 1 (t) into the following formula to calculate the modulation factor θ 2 of the navigation message branch signal S 2 (t):
(2) Substituting a power ratio α 3 =4/3 of the preset communication data branch baseband signal S 3 (t) and the navigation ranging branch signal S 1 (t) into the following formula to calculate a modulation factor θ 3 of the communication data branch baseband signal S 3 (t):
Step 5: each of the I, Q baseband signals is calculated by θ 2＝0.5236,θ3 = 0.8571 obtained in step 4:
(1) I the baseband signal I (t) is derived from the following formula:
I(t)＝S2(t)sinθ2cosθ3+S3(t)cosθ2sinθ3
(2) The Q baseband signal Q (t) is derived from:
Q(t)＝S1(t)cosθ2cosθ3-S1(t)S2(t)S3(t)sinθ2sinθ3
the resulting I (t) and Q (t) time domain waveforms at simulation times t of 0 to 5E-5s are shown in fig. 4 and 5, respectively.
Step 6: and respectively carrying out carrier modulation on the baseband signals I (t) and Q (t), namely multiplying the carriers with the same frequency and different initial phases by the following formula to obtain an I-path radio frequency signal S I (t) and a Q-path radio frequency signal S Q (t) after carrier modulation:
SI(t)＝I(t)cos(2πfct)
SQ(t)＝Q(t)sin(2πfct)
Where f c = 5022.93MHz. The time domain waveforms of S I (t) and S Q (t) obtained at simulation times t of 0 to 5E-5S are shown in FIGS. 6 and 7, respectively.
Step 7: adding S I (t) and S Q (t) to obtain a transmission signal S (t):
S(t)＝SI(t)+SQ(t)
the resulting S (t) time domain waveform at simulation times t of 0 to 5E-5S is shown in FIG. 8. And finally, transmitting S (t) into the channel through a signal transmitter.
The simulation diagram of the envelope I (t) 2+Q(t)2 of the baseband signal is shown in fig. 9, and the envelope of the signal is shown to be constant 1, which proves that the combined signal obtained by multiplexing three signals with one frequency point according to the satellite platform-based navigation communication integrated signal design method of the embodiment has constant envelope characteristics, and can avoid nonlinear distortion caused when the signal passes through a satellite power amplifier.
Claims (1)
1. A navigation communication integrated signal design method based on a satellite platform is characterized in that the method combines a navigation ranging signal, a navigation message signal and a communication data signal together, and constant envelope modulation transmission is carried out by using the same frequency point; the method specifically comprises the following steps:
Step 1: generating a navigation ranging branch baseband signal S 1 (t):
(1) Inputting a spread spectrum code stream of a navigation ranging branch, wherein the spread spectrum code stream is a0 sequence and a1 sequence;
(2) Performing polarity conversion on the values of the 0 sequence chip and the 1 sequence chip of the spread spectrum code stream of the navigation ranging branch, wherein 0 is converted into 1, and 1 is converted into-1;
Step 2: generating a navigation message branch baseband signal S 2 (t):
(1) Inputting a navigation message branch data bit stream, wherein the data bit stream is a 0, 1 sequence;
(2) Channel coding is carried out on navigation message data, and framing is carried out according to the message frame format requirement;
(3) Performing mode two sum operation on the coded navigation message data and the spread spectrum code to realize spread spectrum processing;
(4) Performing polarity conversion on the 0, 1 sequence chip values after the spread spectrum of the navigation message data, wherein 0 is converted into 1, and 1 is converted into-1;
step 3: generating a communication data branch baseband signal S 3 (t):
(1) Inputting a communication data branch data bit stream, wherein the data bit stream is a 0, 1 sequence;
(2) Channel coding is carried out on communication data, and framing is carried out according to the frame format requirement of the communication data;
(3) Performing mode two sum operation on the coded communication data and the spread spectrum code to realize spread spectrum processing;
(4) Performing polarity conversion on the 0,1 chip value after the communication data spread spectrum, wherein 0 is converted into 1, and 1 is converted into-1;
Step 4: fixing the modulation factor theta 1 of the navigation ranging branch baseband signal S 1 (t) to pi/2, and calculating the modulation factor theta 2 of the navigation text branch baseband signal S 2 (t) and the modulation factor theta 3 of the communication data branch baseband signal S 3 (t):
(1) According to the power ratio alpha 2 of the preset navigation text branch baseband signal S 2 (t) and the navigation ranging branch baseband signal S 1 (t), the modulation factor theta 2 of the navigation text branch baseband signal S 2 (t) is calculated according to the following formula:
(2) According to the power ratio alpha 3 of the preset communication data branch baseband signal S 3 (t) and the navigation ranging branch baseband signal S 1 (t); the communication data branch baseband signal S 3 (t) modulation factor θ 3 is calculated as follows:
Step 5, respectively generating I, Q roadbed band signals:
(1) I the baseband signal I (t) is derived from the following formula:
I(t)＝S2(t)sinθ2cosθ3+S3(t)cosθ2sinθ3
(2) The Q baseband signal Q (t) is derived from:
Q(t)＝S1(t)cosθ2cosθ3-S1(t)S2(t)S3(t)sinθ2sinθ3
Step 6: and respectively carrying out carrier modulation on the baseband signals I (t) and Q (t), namely multiplying the carriers with the same frequency and the initial phase difference pi/2 by the following formula to obtain an I-path radio frequency signal S I (t) and a Q-path radio frequency signal S Q (t) after carrier modulation:
SI(t)＝I(t)cos(2πfct)
SQ(t)＝Q(t)sin(2πfct)
Wherein f c is the carrier frequency;
Step 7: adding S I (t) and S Q (t) to obtain a transmitted on integrated signal radio frequency combined signal S (t):
S(t)＝SI(t)+SQ(t)
And finally, transmitting S (t) into the channel through a signal transmitter.
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| CN111868545A (en) * | 2019-02-19 | 2020-10-30 | 中国人民解放军海军航空大学 | Satellite communication navigation signal generation method and device and satellite communication navigation signal receiving method and device |
| WO2020200002A1 (en) * | 2019-03-29 | 2020-10-08 | 华为技术有限公司 | Communication method and terminal device |
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