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CN108983155B - A Radar Communication Integrated Waveform Design Method - Google Patents

A Radar Communication Integrated Waveform Design Method Download PDF

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CN108983155B
CN108983155B CN201810745684.6A CN201810745684A CN108983155B CN 108983155 B CN108983155 B CN 108983155B CN 201810745684 A CN201810745684 A CN 201810745684A CN 108983155 B CN108983155 B CN 108983155B
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corresponds
symbol
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radar communication
radar
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CN108983155A (en
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曾浩
吉利霞
赵云霄
方贝贝
董涛
殷杰
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Chongqing University
Space Star Technology Co Ltd
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Space Star Technology Co Ltd
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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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/282—Transmitters
    • 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
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • 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
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

一种雷达通信一体化波形设计方法,其特征在于：输入通信基带信号序列{ai}经过比特映射模块，输出两路并行符号序列{bn}和{cn}；比特映射模块每连续4个输入比特的16种情况与输出的符号序列的16种情况一一对应；比特映射模块输出的两路符号序列{bn}和{cn}，分别与本振模块产生的线性调频正交载波sI(t)和sQ(t)相乘；在符号bn和cn存在期间相乘后的两路输出信号分别为p(t)和q(t)；雷达通信一体化波形最终输出信号为z(t)＝p(t)+q(t)。本发明把线性调频脉冲作为16QAM调制信号的载波，提高频谱利用率，可以用于雷达通信一体化技术领域。

Figure 201810745684

A radar communication integrated waveform design method, characterized in that: an input communication baseband signal sequence {a i } passes through a bit mapping module, and outputs two parallel symbol sequences {b n } and {c n }; The 16 cases of the input bits are in one-to-one correspondence with the 16 cases of the output symbol sequence; the two-way symbol sequences {b n } and {c n } output by the bit mapping module are respectively orthogonal to the chirp generated by the local oscillator module. Carriers s I (t) and s Q (t) are multiplied; the two output signals after multiplication during the existence of symbols b n and c n are p(t) and q(t) respectively; the radar communication integrated waveform is finally The output signal is z(t)=p(t)+q(t). The invention uses the linear frequency modulation pulse as the carrier of the 16QAM modulation signal, improves the spectrum utilization rate, and can be used in the technical field of radar communication integration.

Figure 201810745684

Description

Radar communication integrated waveform design method
Technical Field
The invention relates to the field of radar communication integration, in particular to a radar communication integration waveform design method.
Technical Field
In the radar communication integration technology, the transmitter can adopt an integrated waveform design, namely, a radar detection waveform and a communication waveform are organically combined, and the design method of the shared waveform realizes communication on the premise of not influencing the radar detection function. The modulation information carried on the waveform is demodulated in a communication signal processing module of the receiver, so that the communication function is realized; the echo of the waveform is processed and analyzed by a radar signal processing module in the receiver to acquire information such as the position, the speed, the shape and the like of the target. Linear Frequency Modulation (LFM) signals are commonly used radar pulse waveforms, and the waveforms are used as carrier waves and can be combined with the existing communication waveforms to be integrally designed. In the existing radar communication integrated waveform design, the integrated waveform design combining MSK, OFDM, BPSK, QPSK and LFM is known in the art. However, these modulation methods belong to low-order modulation, and the spectrum utilization rate is low. In order to improve the frequency spectrum utilization rate, the radar communication integrated waveform design needs to realize the combination of high-order modulation and LFM.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to combine high-order modulation 16QAM and LFM waveform in communication to realize radar communication integrated waveform design and improve the frequency spectrum utilization rate.
The technical scheme for solving the technical problem is a radar communication integrated waveform design method, which is characterized in that:
input communication baseband signal sequence { a }iLength T, and 4N bits, each bit ai1, each bit having a time width of TaWherein i is 1,2, 4N, and T is 4N · Ta(ii) a The baseband signal sequence passes through a bit mapping module to output two paths of parallel symbol sequences { bnAnd { c }andnEach path of symbol sequence comprises N symbols, each symbol has 4 values, which are respectively +/-1 and +/-3, and the time width of each symbol is TbcWherein N is 1,2, N, and Tbc＝4Ta；
The bit mapping module has 4 input bits per sequence { a }i,ai+1,ai+2,ai+3Output 1 symbol bnAnd 1 symbol cnWherein N is 1,2,., N, i is 4(N-1) + 1; inputting continuous 4 bits ai,ai+1,ai+2,ai+3Has 16 different cases and outputs
Figure GDA0003459129400000021
One-to-one correspondence is made between 16 cases; { ai,ai+1Correspond to { b }n1,1 corresponds to 3, 1, -1 corresponds to 1,1 corresponds to 3; { ai+2,ai+3Correspond to { c }n1,1 corresponds to 3, 1, -1 corresponds to 1,1 corresponds to 3; the 16 outputs are respectively
Figure GDA0003459129400000022
Figure GDA0003459129400000023
Two-path symbol sequence { b) output by bit mapping modulenAnd { c }andnThe two paths of orthogonal carriers s generated by the local oscillation module are respectively connected withI(t) and sQ(t) multiplication; the local oscillator firstly generates an in-phase branch carrier wave sI(t)，sI(t) is a chirp (LFM) pulse, denoted sI(t)＝cos(2πft+πμt2) Wherein f is the initial frequency of the LFM signal, mu is the frequency modulation slope of the LFM signal, and T is more than or equal to 0 and less than or equal to T; in-phase branch carrier sI(t) producing quadrature branch carriers s by pi/2 phase shiftingQ(t)，sQ(t) is represented by sQ(t)＝sin(2πft+πμt2) (ii) a At symbol bnAnd cnExistence period (n-1) Tbc≤t<nTbcThe two multiplied output signals are p (t) ═ bnsI(t) and q (t) cnsQ(t), wherein N is 1, 2.
The final output signal of the radar communication integrated waveform is z (t) ═ p (t) + q (t).
The invention has the advantages that the high-order 16QAM modulation is combined with the LFM radar pulse, wherein the LFM signal is used as a 16QAM signal carrier to form a radar communication integrated waveform, and the frequency spectrum rate is improved. The invention can be applied to the technical field of radar communication integration.
Drawings
FIG. 1 shows a structure diagram of an integrated radar communication waveform
Detailed description of the invention
In the radar communication integration technology, a transmitter transmits radar communication integration signals, and a radar and communication shared transmitter is realized. Linear Frequency Modulation (LFM) pulses generated by the radar are used as carrier waves of communication signals, and integrated waveform design is achieved. Among various communication digital modulation modes, 16QAM is high-order modulation and has the characteristic of high spectrum utilization rate.
Input communication baseband signal sequence { a }iLength T, and 4N bits, each bit ai1, each bit having a time width of TaWherein i is 1,2, 4N, and T is 4N · Ta(ii) a The baseband signal sequence passes through a bit mapping module to output two paths of parallel symbol sequences { bnAnd { c }andnEach path of symbol sequence comprises N symbols, each symbol has 4 values, which are respectively +/-1 and +/-3, and the time width of each symbol is TbcWherein N is 1,2, N, and Tbc＝4Ta。
The bit mapping module has 4 input bits per sequence { a }i,ai+1,ai+2,ai+3Output 1 symbol bnAnd 1 symbol cnWherein N is 1,2,., N, i is 4(N-1) + 1; inputting continuous 4 bits ai,ai+1,ai+2,ai+3Has 16 different cases and outputs
Figure GDA0003459129400000031
One-to-one correspondence is made between 16 cases; { ai,ai+1Correspond to { b }n1,1 corresponds to 3, 1, -1 corresponds to 1,1 corresponds to 3; { ai+2,ai+3Correspond to { c }n1,1 corresponds to 3, 1, -1 corresponds to 1,1 corresponds to 3; the 16 outputs are respectively
Figure GDA0003459129400000032
Figure GDA0003459129400000033
Two-path symbol sequence { b) output by bit mapping modulenAnd { c }andnThe two paths of orthogonal carriers s generated by the local oscillation module are respectively connected withI(t) and sQ(t) multiplication; the local oscillator firstly generates an in-phase branch carrier wave sI(t)，sI(t) is a Linear Frequency Modulated (LFM) pulse, representingIs s isI(t)＝cos(2πft+πμt2) Wherein f is the initial frequency of the LFM signal, mu is the frequency modulation slope of the LFM signal, and T is more than or equal to 0 and less than or equal to T; in-phase branch carrier sI(t) producing quadrature branch carriers s by pi/2 phase shiftingQ(t)，sQ(t) is represented by sQ(t)＝sin(2πft+πμt2) (ii) a At symbol bnAnd cnExistence period (n-1) Tbc≤t<nTbcThe two multiplied output signals are p (t) ═ bnsI(t) and q (t) cnsQ(t), wherein N is 1, 2.
The final output signal of the radar communication integrated waveform is z (t) ═ p (t) + q (t).
The invention has the advantages that the high-order 16QAM modulation is combined with the LFM radar pulse, wherein the LFM signal is used as a 16QAM signal carrier to form a radar communication integrated waveform, the frequency spectrum rate is improved, and high-speed data transmission can be realized. The invention can be applied to the technical field of radar communication integration.

Claims (1)

1.一种雷达通信一体化波形设计方法,其特征在于：1. A radar communication integrated waveform design method is characterized in that: 输入通信基带信号序列{ai}长度为T，共包含4N个比特，每个比特ai＝±1，每个比特时间宽度为Ta，其中i＝1,2,...,4N，并且T＝4N·Ta；基带信号序列经过比特映射模块，输出两路并行符号序列{bn}和{cn}，每路符号序列包含N个符号，每个符号为4种取值，分别为±1和±3，每个符号时间宽度为Tbc，其中n＝1,2,...,N，并且Tbc＝4Ta；The input communication baseband signal sequence {a i } has a length of T and contains 4N bits in total, each bit a i =±1, and the time width of each bit is T a , where i=1,2,...,4N, And T=4N·T a ; the baseband signal sequence passes through the bit mapping module, and outputs two parallel symbol sequences {b n } and {c n }, each symbol sequence contains N symbols, and each symbol is 4 kinds of values, are ±1 and ±3, respectively, each symbol time width is T bc , where n=1, 2, . . . , N, and T bc =4T a ; 比特映射模块每连续4个输入比特{ai,ai+1,ai+2,ai+3}，输出1个符号bn和1个符号cn，其中n＝1,2,...,N，i＝4(n-1)+1；输入连续4个比特{ai,ai+1,ai+2,ai+3}具有16种不同情况，与输出
Figure FDA0003459129390000011
的16种情况一一对应；{ai,ai+1}对应{bn}，即{1,1}对应{3}，{1,-1}对应{1}，{-1,1}对应{-1}，{-1,-1}对应{-3}；{ai+2,ai+3}对应{cn}，即{1,1}对应{3}，{1,-1}对应{1}，{-1,1}对应{-1}，{-1,-1}对应{-3}；16种输出分别为The bit mapping module outputs 1 symbol bn and 1 symbol cn for every 4 consecutive input bits {a i , a i+1 , a i+2 , a i+3 }, where n =1,2,. ..,N, i=4(n-1)+1; input 4 consecutive bits {a i , a i+1 , a i+2 , a i+3 } have 16 different cases, and output
Figure FDA0003459129390000011
One-to-one correspondence of the 16 cases; {a i , a i+1 } corresponds to {b n }, that is, {1,1} corresponds to {3}, {1,-1} corresponds to {1}, {-1,1 } corresponds to {-1}, {-1,-1} corresponds to {-3}; {a i+2 , a i+3 } corresponds to {c n }, that is, {1,1} corresponds to {3}, {1 ,-1} corresponds to {1}, {-1,1} corresponds to {-1}, {-1,-1} corresponds to {-3}; the 16 outputs are
Figure FDA0003459129390000012
Figure FDA0003459129390000012
Figure FDA0003459129390000013
Figure FDA0003459129390000013
 比特映射模块输出的两路符号序列{bn}和{cn}，分别与本振模块产生的两路正交载波sI(t)和sQ(t)相乘；本振首先产生同相支路载波sI(t)，sI(t)为线性调频(LFM)脉冲，表示为sI(t)＝cos(2πft+πμt2)，其中f为LFM信号起始频率，μ为LFM信号调频斜率，时间0≤t≤T；同相支路载波sI(t)经过π/2移相，产生正交支路载波sQ(t)，sQ(t)表示为sQ(t)＝sin(2πft+πμt2)；在符号bn和cn存在期间(n-1)Tbc≤t<nTbc，相乘后的两路输出信号分别为p(t)＝bnsI(t)和q(t)＝cnsQ(t)，其中n＝1,2,...,N；The two-way symbol sequences {b n } and {c n } output by the bit mapping module are multiplied by the two-way orthogonal carriers s I (t) and s Q (t) generated by the local oscillator module respectively; the local oscillator first generates in-phase The tributary carrier s I (t), s I (t) is a linear frequency modulation (LFM) pulse, expressed as s I (t)=cos(2πft+πμt 2 ), where f is the starting frequency of the LFM signal, μ is the LFM Signal frequency modulation slope, time 0≤t≤T; in-phase branch carrier s I (t) is phase-shifted by π/2 to generate quadrature branch carrier s Q (t), s Q (t) is expressed as s Q (t )=sin(2πft+πμt 2 ); during the existence of symbols b n and c n (n-1)T bc ≤t<nT bc , the multiplied two output signals are respectively p(t)=b n s I (t) and q(t)=c n s Q (t), where n=1,2,...,N; 雷达通信一体化波形最终输出信号为z(t)＝p(t)+q(t)。The final output signal of radar communication integration waveform is z(t)=p(t)+q(t).
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