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FPGA-based LFM_BPSK composite modulation signal real-time generation method

A technology of compound modulation and generation method, which is applied in the direction of modulation carrier system, frequency modulation carrier system, phase modulation carrier system, etc.

Active Publication Date: 2019-12-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a real-time generation method of LFM_BPSK composite modulation signal based on FPGA, which solves the problem of generating multi-channel parallel LFM_BPSK composite modulation signal in real time with FPGA

Method used

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  • FPGA-based LFM_BPSK composite modulation signal real-time generation method
  • FPGA-based LFM_BPSK composite modulation signal real-time generation method
  • FPGA-based LFM_BPSK composite modulation signal real-time generation method

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Embodiment Construction

[0033] Such as figure 1 Shown, a kind of FPGA-based LFM_BPSK complex modulation signal real-time generation method comprises the following steps:

[0034] Step 1. Read the chirp signal parameter modulation frequency μ and the output data number M of each channel from the ROM. The initial value of the real-time angle of LFM signal 8-channel data is

[0035] The first way: Θ(0)=4μ 0 ·2 -18

...

[0036] The i-th way: Θ(i-1)=(i+3)μ 0 ·2 -18

[0037] where μ 0 = 2 33 ·(1 / f s ) 2μ, the length is 18bit, calculated and downloaded by the host computer, f s is the baseband signal sampling rate; i=0, 1, 2...7. qth m In one clock cycle, the real-time angle of the 8 channels of LFM signal data is

[0038] The first way: Θ(8q m -8)=Θ(8q m -16)+8μ 0 (q m -1) 2 -18

...

[0039] The i-th way: Θ(8q m +i-1)=Θ(8q m +i-9)+8μ 0 (q m -1) 2 -18

[0040] where m=8×q m +i,q m =2, 3, ..., M, i=0, 1, 2, ... 7, Θ(8q m +i-9) is the (q m -1) The real-time angle of the i-th ...

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Abstract

The invention discloses an FPGA (Field Programmable Gate Array)-based LFM _ BPSK (Linear Frequency Modulation _ Binary Phase Shift Keying) composite modulation signal real-time generation method, which comprises the following steps: (1) reading the modulation frequency of a linear frequency modulation signal and each path of output data number from an ROM (Read Only Memory) to generate an LFM (Linear Frequency Modulation) signal; (2) repeatedly reading the binary data stored in the ROM, determining the symbol of the BPSK signal according to the phase value of the data, and forming a data sequence; and (3) carrying out quadrature modulation on the LFM signal and the BPSK signal to obtain an LFM _ BPSK composite modulation signal. According to the invention, the frequency range and samplingrate of the baseband signal are variable, the bandwidth of the LFM signal, the radar emission pulse width and the data length for phase encoding are controllable, and the feasibility of the algorithmis verified by frequency domain and time domain simulation results. The conclusion of the invention has important theoretical guidance significance for the design of the radio frequency target simulator.

Description

technical field [0001] The invention relates to the technical field of signal generation, in particular to a real-time generation method of an FPGA-based LFM_BPSK composite modulation signal. Background technique [0002] At present, chirp signals and phase coded signals are widely used in modern high-performance radar systems. Among them, the chirp signal has good distance resolution and radial velocity resolution, and the same matched filter can be used to process radar echo signals with different Doppler frequency shifts, which greatly simplifies the radar echo signal processing system. The phase-encoded signal has good anti-interference ability while satisfying the working distance and resolution. LFM_BPSK composite modulation signal has the advantages of both LFM signal and BPSK signal, and is suitable for complex electromagnetic environments. It has attracted people's attention in recent years. [0003] FPGA (Online Programmable Logic Array) is widely used in variou...

Claims

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Application Information

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IPC IPC(8): H04L27/10H04L27/20H04L27/32G01S7/40G01S7/35
CPCG01S7/35G01S7/4052H04L27/103H04L27/20H04L27/32
Inventor 唐建潘明海胥伟李益民
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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