CN108983155B - Radar communication integrated waveform design method - Google Patents

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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symbol
corresponds
output
mapping module
radar communication
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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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Chongqing University
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

Abstract

A radar communication integrated waveform design method is characterized in that: input communication baseband signal sequence { a }iOutputs two paths of parallel symbol sequences { b ] through a bit mapping modulenAnd { c }andn}; the bit mapping module corresponds to 16 cases of the output symbol sequence one by one in every 16 continuous input bits; two-path symbol sequence { b) output by bit mapping modulenAnd { c }andnAnd the orthogonal carriers are respectively orthogonal to the linear frequency modulation carriers s generated by the local oscillation moduleI(t) and sQ(t) multiplication; at symbol bnAnd cnTwo paths of output signals multiplied in the existence period are p (t) and q (t) respectively; the final output signal of the radar communication integrated waveform is z (t) ═ p (t) + q (t). The invention takes the linear frequency modulation pulse as the carrier of the 16QAM modulation signal, improves the utilization rate of the frequency spectrum, and can be used in the technical field of radar communication integration.

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. A radar communication integrated waveform design method 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 FDA0003459129390000011
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 FDA0003459129390000012
Figure FDA0003459129390000013
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).
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