雷达波形通用调制引擎设计

doi:10.12305/j.issn.1001-506X.2023.06.12

Abstract

Abstract:

Aiming at the problem of the efficient and flexible generation of software radar complex modulation waveforms, the complex modulation pulse train is abstractly described as a waveform matrix with the coherent processing interval as the update period, and a radar waveform generation method that selects and separates is proposed, which reduce the amount of calculation of the host computer and the transmission delay to the hardware. On this basis, an field programmble gate array (FPGA)-based general-purpose modulation engine for radar waveforms is designed, which can realize the decoupling of waveform generation and waveform pattern, waveform optimization/selection and waveform generation decoupling. The system test based on commercial off-the-shelf (COTS) shows that the universal modulation engine can flexibly support arbitrary intra-pulse modulation, inter-pulse waveform agility, and inter-pulse parameter modulation such as phase, frequency deviation, amplitude, repetition interval, etc. Providing important design reference with flexible use to generate software radar waveforms.

Key words: software defined radar, wave matrix, waveform generation, inter-pulse modulation, waveform agility, modulation engine, field programmble gate array (FPGA), wave confrontation

CLC Number:

TN951

Min WANG, Yilun FENG, Yanwen JIANG, Hongqi FAN. Design of general modulation engine for radar waveform[J]. Systems Engineering and Electronics, 2023, 45(6): 1684-1692.

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模块名称	时钟名称	时钟频率/MHz
系统时钟模块	CLK0	250
脉冲整形模块	CLK1	250
DDS模块	CLK2	40
延时模块	CLK3	80

数据参数名称	字长
w_{o_m}	32
a_m	16
ϕ_m	8
Δf_m	24
Δt_m	16

资源名称	使用量/%
逻辑片总数	16.9(7 685)
逻辑片寄存器	10.9(4 948)
逻辑片LUT	9.1(3 916)
RAM块	20.2(209)
DSP48	12.4(556)

基础波形	类型	说明
w₁	正弦波	频率5 MHz
w₂	线性调频信号	带宽10 MHz, 正调频
w₃	线性调频信号	带宽10 MHz, 负调频
w₄	相位编码	二相13位巴克码
w₅	相位编码	二相随机编码

调制类型	取值范围	说明
随机初相/(°)	0或180	均匀分布
频率步进/MHz	0~15	以500 kHz步进
重频抖动	±10%T_r	均匀分布

Design of general modulation engine for radar waveform

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