A real-time generation method of lfm_bpsk composite modulation signal based on fpga

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

Active Publication Date: 2021-09-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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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  • A real-time generation method of lfm_bpsk composite modulation signal based on fpga
  • A real-time generation method of lfm_bpsk composite modulation signal based on fpga
  • A real-time generation method of lfm_bpsk composite modulation signal based on fpga

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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 a real-time generation method of an LFM_BPSK composite modulation signal based on FPGA, which comprises the following steps: (1) reading the modulation frequency of the linear frequency modulation signal and the output data number of each channel from a ROM to generate an LFM signal; (2) repeatedly reading Take the binary data stored in the ROM, determine the symbol of the BPSK signal according to the phase value of the data, and form a data sequence; (3) perform quadrature modulation on the LFM signal and the BPSK signal to obtain the LFM_BPSK composite modulation signal. In the present invention, the frequency range and sampling rate of the baseband signal are variable, the bandwidth of the LFM signal, the pulse width of the radar emission and the data length used for phase encoding are all controllable, and the simulation results of the frequency domain and the time domain verify the feasibility of the algorithm. The conclusions of the invention have important theoretical guiding significance for the design of radio frequency target simulators.

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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Patent Type & Authority Patents(China)
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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