CN115913361A - Space laser communication and speed measurement method - Google Patents
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Abstract
The invention discloses a space laser communication and speed measurement method, which comprises the following steps: obtaining a communication receiving signal according to a communication transmitting signal, and obtaining digital sampling data based on the communication receiving signal; symbol synchronization and judgment are carried out on the basis of the digital sampling data, and symbol sampling data are constructed; obtaining symbol Doppler frequency shift sample data by using the digital sample data and the symbol sample data; performing phase continuity check and phase jump repair on the code element symbol Doppler frequency shift sampling data to obtain code element symbol Doppler frequency shift sampling data with continuous phase; and carrying out frequency analysis on the code element symbol Doppler frequency shift sampling data with continuous phases to obtain speed information, and finishing space laser communication and speed measurement. The invention adopts a one-way mode, can simultaneously realize space laser communication and real-time speed measurement, has simple and easily realized method principle, and can be applied to speed measurement of other wireless communication systems.
Description
Technical Field
The invention belongs to the field of free space laser communication and laser speed measurement, and particularly relates to a space laser communication and speed measurement method.
Background
The integrated technology of space laser measurement and communication is a comprehensive technology combining laser detection, laser communication and signal processing. The laser is utilized to realize communication and high-precision speed measurement, has very important significance for realizing satellite autonomous navigation, aerospace precise measurement and control and the like, and has wide application prospect in the civil and military fields.
The existing one-way two-way laser Doppler velocimetry Technology, such as the literature "laser Doppler velocimetry Technology development" (author: zhang Yan et al, publication: laser and infrared, issue: volume 40, no. 11, page number: 1157-1162) and the literature "Frequency-Modulated Coherent-Wave Coherent Lidar With Downlink Communications capabilities" (author: zhongyang Xu et al, publication: IEEE Photonics Technology Letters, issue: volume 32, no. 11, page number: 655-658), performs velocimetry by using the difference Frequency of the laser echo and the reference light signal; the invention discloses a laser communication detection device and a laser communication detection method, which directly measure the speed of a laser echo. The method is not suitable for the application scene of long-distance transmission of space laser communication. The invention discloses a laser communication and speed measurement system based on a reverse modulator, which needs to be added with a single reverse modulator MRR and a coherent detection light module to realize speed measurement.
Another type of laser measurement technology based on two-way, for example, the invention patent "method for measuring distance, speed, clock difference and frequency difference by using two-way communication transmission frame synchronization code", needs to add measurement and control information such as ranging code in communication information, adds a "measurement frame" identification information and a frame synchronization code arrival time measurement module at a transmitting and receiving end, and adopts a multi-way two-way communication mode to realize parameter measurement such as distance, speed and the like after multiple times of transmitting and receiving, and the system structure and the processing flow are complex; the document "design and implementation of unified measurement and control system of laser based on OOK system" (author: zhu hong Ye, etc., publication: journal of Beijing university of science and engineering, no. 40, no. 11, page number: 1203-1206), is only suitable for laser ranging, speed measurement and communication of intensity modulation/direct detection system; the invention discloses a laser Doppler frequency shift speed measurement method based on bidirectional one-way communication, which needs to simultaneously carry out Doppler frequency shift measurement at two transmitting and receiving ends and cannot acquire speed information in real time. Therefore, it is desirable to provide a method for spatial laser communication and speed measurement, which synchronously extracts and measures the doppler shift information of a symbol during symbol synchronization and decision at a receiving end.
Disclosure of Invention
The invention aims to provide a space laser communication and speed measurement method, which adopts a one-way mode and can simultaneously realize space laser communication and real-time speed measurement; the method is simple in principle and easy to implement, can be applied to speed measurement of other wireless communication systems, and is worthy of wide popularization and application.
In order to achieve the purpose, the invention provides a space laser communication and speed measurement method, which comprises the following steps:
obtaining a communication receiving signal according to a communication transmitting signal, and obtaining digital sampling data based on the communication receiving signal;
symbol synchronization and judgment are carried out on the basis of the digital sampling data, and symbol sampling data are constructed;
obtaining code element symbol Doppler frequency shift sampling data by utilizing the digital sampling data and the code element symbol sampling data;
performing phase continuity check and phase jump repair on the code element symbol Doppler frequency shift sampling data to obtain code element symbol Doppler frequency shift sampling data with continuous phase;
and carrying out frequency analysis on the code element symbol Doppler frequency shift sampling data with continuous phases to obtain speed information, and finishing space laser communication and speed measurement.
Optionally, the communication emission signal E t (t) is represented as follows:
where exp represents an exponential function based on the natural logarithm, pi represents the circumferential ratio,
f c is the laser carrier frequency->
Phase modulation information;
where T is the symbol interval, b k Representing the kth symbol transmitted, k =0,1, \ 8230;, g (t) is the shaping function, calculated as follows:
let the relative movement speed of the receiving and transmitting ends be v, the distance between the receiving and transmitting ends at the time of t is R = vt, and the communication receiving signal E r (t) is represented by the following formula,
where c is the speed of light.
Optionally, obtaining digital sampling data based on the communication receiving signal specifically includes:
and performing coherent detection and low-pass filtering on the communication receiving signals in a one-way and one-way mode to obtain homodyne intermediate frequency signals, and performing A/D conversion on the homodyne intermediate frequency signals to obtain the digital sampling data.
Optionally, symbol synchronization is performed based on the digital sampling data to obtain a sampling sequence and symbol synchronization timing information, which specifically includes:
carrying out code element symbol synchronization on the digital sampling data by adopting an interpolation method to obtain the sampling sequence;
and acquiring the symbol synchronization timing information according to the time sequence relation between the sampling sequence and the digital sampling data.
Optionally, symbol decision is performed based on the sampling sequence to obtain communication data, and a symbol decision result is:
wherein ,bk Is the transmitted symbol, b' k Is a received symbol.
Optionally, obtaining the symbol doppler shift sample data by using the digital sample data and the symbol sample data specifically includes:
and multiplying the digital sampling data by the code element symbol sampling data by a conjugate function to obtain the code element symbol Doppler frequency shift sampling data.
Optionally, the symbol doppler shift sample data is obtained by calculating as follows:
wherein D (mT) s ) Sampling data for symbol-symbol Doppler shift, I (mT) s ) For digitally sampled data, S * (mT s ) Sampling data for symbol symbols, T s Is the intermediate frequency signal a/D sampling time interval, m =0,1, \ 8230;,
f D = 2v/Tc Doppler shift of symbol, b k Is the symbol, b 'of the transmission' k For received symbol symbols, mu k and mk Is the symbol timing information, e is an exponential function with the natural logarithm as the base number, and g is a shaping function.
Optionally, the phase continuity check and phase jump repair are performed on the symbol doppler shift sample data to obtain the symbol doppler shift sample data with continuous phase, which specifically includes:
when the symbol decision is correct, the symbol-symbol Doppler frequency shift sampling data is Doppler frequency shift information f only containing symbol symbols D The maximum phase difference between adjacent data points does not exceed +/-2 pi f Dmax T s, wherein fDmax The maximum allowable Doppler frequency shift of the space laser communication system;
when symbol judgment is wrong, the Doppler frequency shift sampling data of the symbol symbols generates phase jump of about +/-pi between adjacent data at the symbol position of wrong judgment;
and performing phase continuity check on the code element symbol Doppler frequency shift sample data, wherein the phase difference between the adjacent data points exceeds a set threshold value, and performing phase jump restoration on the code element symbol Doppler frequency shift sample data to obtain the code element symbol Doppler frequency shift sample data with continuous phase.
The invention has the technical effects that: the invention discloses a space laser communication and speed measurement method, which is characterized in that Doppler frequency shift information extraction and measurement are carried out on code element symbols at a receiving end, a one-way and one-way mode is adopted, space laser communication and real-time speed measurement can be simultaneously realized, symbol synchronization timing information and a symbol judgment result are directly utilized, doppler frequency shift information of the code element symbols is synchronously extracted and measured, independent modules such as modulation and detection are not required to be added at a transmitting end and a receiving end, and the system is simple in structure and easy to realize; the invention is suitable for various space laser communication working systems such as coherent detection and the like, and can also be applied to speed measurement of other wireless communication systems.
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The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 is a schematic flow diagram of a space laser communication and speed measurement method according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
It can be known from the technical background that the existing spatial laser speed measurement technology needs to add an independent measurement system on the basis of a communication system, and designs specific measurement and control information or measurement time sequence by using a two-way or two-way mode to realize speed measurement, and the system structure and the processing flow are complex. Aiming at the problems, the invention provides a method for synchronously extracting and measuring the Doppler frequency shift information of the code element symbol in the process of symbol synchronization and judgment at a receiving end, does not need to increase measurement and control information, does not need to increase independent modules such as modulation, detection and the like at a transmitting and receiving end, and can simultaneously realize space laser communication and real-time speed measurement only in a one-way and one-way mode.
As shown in fig. 1, the present embodiment provides a method for spatial laser communication and speed measurement, including the following steps:
the method comprises the following steps: adopting one-way mode, the transmitting end transmits signal to the receiving end, after t time, the receiving end receives the signal, completes carrier demodulation, and performs A/D conversion on the obtained intermediate frequency signal to obtain digital sampling data I (mT) s )。
Communication emission signal E t (t) is a form of the formula (1)
In (1), π represents the circumference ratio,
f c for the laser carrier frequency,>
for modulating information for phase
Where T is the symbol interval, n k Represents the kth symbol transmitted, k =0,1. g (t) is a shaping function, here a rectangular function, i.e.
Let the relative movement speed of the transmitting and receiving ends be v, and after t time, the distance between the transmitting and receiving ends is R = vt, and the communication receiving signal can be written in the form of (4).
Wherein c is the speed of light, f D = 2v/Tc represents the doppler shift of the phase modulation symbol.
The communication receiving signal is processed by coherent detection and low-pass filtering, and (4) the laser carrier frequency f c The related terms are eliminated or suppressed, and the homodyne intermediate frequency signal is obtained in the form of the formula (5)
A/D conversion (with sampling time interval T) of zero difference intermediate frequency signal s ) To obtain digital sampling data I (mT) s ) M =0,1, \ 8230;. For the k-th symbol, the symbol is,
I(mT s )＝exp{j[2πf D mT s +b k g(mT s -kT)]} (6)
step two: the interpolation method is adopted to carry out symbol synchronization, and a sampling sequence Y (kT) used for symbol judgment and symbol synchronization timing information mu are obtained k and mk 。
Let the output data time interval of the interpolation filter be the same as the symbol interval, which is T. After interpolation filtering, a sampling sequence Y (kT) for code element judgment can be obtained
Y(kT)＝∑ m I(mT s )×h I (kT-mT s ) (7)
wherein ,hI Is the interpolation filter response. Sampling sequence Y (kT) and intermediate frequency digital sampling data I (mT) s ) Has the timing relationship of
kT＝(m k +μ k )T s (8)
wherein μk Is the timing phase error of the kth symbol, and m k ＝int[kT/T s ](int[]Representing a rounding operation). Sample data I (mT) in combination with symbol synchronization timing information of equation (8) s ) Is composed of
Step three: symbol decision is made on the interpolated sample sequence Y (kT) to recover the transmitted symbol b' k . According to equation (2), the result of symbol decision is:
step four: using symbol decision result b' k Timing information mu synchronous with code element k 、m k Constructing symbol-sampled data S (mT) s ) For the k code element
Step five: and multiplying the intermediate frequency digital sampling data by a conjugate function of the code element symbol sampling data to obtain code element symbol Doppler frequency shift sampling data.
The symbol doppler shift sample data D (mT) is obtained by combining expressions (9), (10), and (11) s ) Is composed of
Step six: sampling data D (mT) for Doppler frequency shift s ) And carrying out phase continuity check and phase jump repair.
According to the expressions (10) and (12), when the symbol decision is correct, D (mT) s ) Is Doppler shift information f containing symbol symbols only D The maximum phase difference between adjacent data points does not exceed +/-2 pi f Dmax T s, wherein fDmax The maximum allowable Doppler frequency shift of the space laser communication system; d (mT) when symbol decision error occurs s ) At the symbol of the erroneous decision, a phase jump of about ± pi occurs between adjacent data.
To D (mT) s ) A phase continuity check is performed and if the phase difference between adjacent data points exceeds a certain threshold (e.g., ±/2), it indicates that the latter data point is affected by a symbol decision error. At this time, let b' k ＝b' k And + -pi, wherein the sign of + -pi is determined by the sign of the phase difference between adjacent data points, and symbol-symbol sampled data is regenerated (see equation (11)) and multiplied by the intermediate frequency digital sampled data (see equation (12)). The data after completing the phase jump repair is Doppler frequency shift information f only containing code element symbols D Phase continuous signal D' (mT) s )。
Step seven: doppler-shift sample data D' (mT) for symbol symbols having continuous phase s ) And carrying out frequency analysis and outputting speed measurement information.
The embodiment of the invention is a speed measurement technical scheme based on a Binary Phase Shift Keying (BPSK) phase modulation/homodyne coherent detection laser communication system.
The embodiment only provides an implementation scheme under a homodyne coherent detection laser communication system, and the technical scheme provided by the invention is developed after the communication receiving end completes A/D sampling, so that the speed measurement scheme provided by the invention is also completely applicable to various laser communication systems such as heterodyne coherent detection, direct detection and the like and various digital wireless communication systems.
The invention discloses a space laser communication and speed measurement method, which is characterized in that Doppler frequency shift information extraction and measurement are carried out on code element symbols at a receiving end, a one-way mode is adopted, space laser communication and real-time speed measurement can be simultaneously realized, the Doppler frequency shift information of the code element symbols is synchronously extracted and measured by directly utilizing symbol synchronization timing information and a symbol judgment result, independent modules such as modulation and detection are not required to be added at a transmitting end and a receiving end, and the system is simple in structure and easy to realize; the invention is suitable for various space laser communication working systems such as coherent detection and the like, and can also be applied to speed measurement of other wireless communication systems.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A space laser communication and speed measurement method is characterized by comprising the following steps:
obtaining a communication receiving signal according to a communication transmitting signal, and obtaining digital sampling data based on the communication receiving signal;
symbol synchronization and judgment are carried out on the basis of the digital sampling data, and symbol sampling data are constructed;
obtaining symbol Doppler frequency shift sample data by using the digital sample data and the symbol sample data;
performing phase continuity check and phase jump repair on the code element symbol Doppler frequency shift sampling data to obtain code element symbol Doppler frequency shift sampling data with continuous phase;
and carrying out frequency analysis on the code element symbol Doppler frequency shift sampling data with continuous phases to obtain speed information, and finishing space laser communication and speed measurement.
2. The space laser communication and velocity measurement method according to claim 1, wherein the communication emission signal E t (t) is represented as follows:
where exp represents an exponential function based on the natural logarithm, pi represents the circumferential ratio,
f c for the laser carrier frequency,>
phase modulation information;
where T is the symbol interval, b k Representing the kth symbol transmitted, k =0,1, \ 8230;, g (t) is the shaping function, calculated as follows:
let the relative movement speed of the two ends be v, the distance between the two ends at t time be R = vt, and the communication receiving signal E r (t) is represented by the following formula,
where c is the speed of light.
3. The method for spatial laser communication and speed measurement according to claim 1, wherein obtaining digital sampling data based on the communication reception signal specifically includes:
and performing coherent detection and low-pass filtering on the communication receiving signals in a one-way and one-way mode to obtain homodyne intermediate frequency signals, and performing A/D conversion on the homodyne intermediate frequency signals to obtain the digital sampling data.
4. The space laser communication and velocity measurement method according to claim 1,
performing symbol synchronization on the digital sampling data to obtain a sampling sequence and symbol synchronization timing information, specifically comprising:
carrying out code element symbol synchronization on the digital sampling data by adopting an interpolation method to obtain the sampling sequence;
and acquiring the symbol synchronization timing information according to the time sequence relation between the sampling sequence and the digital sampling data.
5. The spatial laser communication and velocity measurement method according to claim 4, wherein symbol decision is performed based on the sampling sequence to obtain communication data, and the symbol decision result is:
wherein ,bk Is the transmitted symbol, b' k Is a received symbol.
6. The method according to claim 5, wherein the obtaining of the symbol doppler shift sample data by using the digital sample data and the symbol sample data comprises:
and multiplying the digital sampling data by the code element symbol sampling data by a conjugate function to obtain the code element symbol Doppler frequency shift sampling data.
7. The method according to claim 6, wherein the symbol doppler shift sample data is obtained by calculating as follows:
wherein D (mT) s ) Sampling data for symbol-symbol Doppler shift, I (mT) s ) For digitally sampled data, S * (mT s ) Sampling data for symbol symbols, T s Is the intermediate frequency signal a/D sampling time interval, m =0,1, \ 8230;,
fD = -2v/Tc Doppler shift of symbol, b k Is the transmitted symbol, b' k For received symbol symbols, mu k and mk Is the symbol timing information, e is an exponential function with the natural logarithm as the base number, and g is a shaping function.
8. The method according to claim 7, wherein the performing phase continuity check and phase jump restoration on the symbol doppler shift sample data to obtain the symbol doppler shift sample data with continuous phase includes:
when the symbol decision is correct, the symbol-symbol Doppler frequency shift sampling data is Doppler frequency shift information f only containing symbol symbols D The maximum phase difference between adjacent data points does not exceed +/-2 pi f Dmax T s, wherein fDmax The maximum allowable Doppler frequency shift of the space laser communication system;
when symbol judgment is wrong, the symbol Doppler frequency shift sampling data generates a phase jump of about +/-pi between adjacent data at the symbol position of wrong judgment;
and performing phase continuity check on the code element symbol Doppler frequency shift sample data, wherein the phase difference between the adjacent data points exceeds a set threshold value, and performing phase jump restoration on the code element symbol Doppler frequency shift sample data to obtain the code element symbol Doppler frequency shift sample data with continuous phase.
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