可编程雷达测距的计算机仿真

本文给出了一种基于可编程芯片的雷达测距的计算机仿真系统，用软件实现对雷达目标回波的搜索，截获及跟踪用一种优化的滤波与预测算法对测距数据进行处理，得到仿真结果。本系统还可支持ＴＭＳ３２０Ｃ２５的软硬件开发。     

CPLD模块在毫米波雷达测距中的应用研究

主要介绍了用VHDL语言对CPLD进行编程，实现毫米波雷达测距。在分析和实验的基础上，达到了要求的技术指标，并且提高了测距精度。     

低成本微型测距雷达设计

为了小型化与低成本的目的,微型测距雷达选用了低价格、高性能的单片机和近几年发展起来的数字与模拟电路,形成三角波调制的雷达调频连续波方式对距离进行测量。利用单片机中断方式判断三角波的正负斜率,方便地区分接收回的三角波正负斜率的频率差,进而求出距离和速度。试验结果表明,测试距离精度满足要求,但混频输出灵敏度偏低,测试距离较近。这说明微型测距雷达设计原理正确,经过改进,其用途和前景广阔。     

精密跟踪雷达中全软件实现测距和测速

测距和测速是精密跟踪雷达的重要组成部分,采用基于DSP和标准总线硬件平台全软件实现测距和测速功能后,其硬件量缩减为3个模块板,精度和性能稳定性得到较大提升,更易于系统调试和验证。文中对全软件实现测距和测速的硬件组成和软件模块进行了介绍,并对调试方法作了介绍。     

一种面向液压储能器的122 GHz FMCW 测距雷达

针对液压储能器活塞位移测量过程中存在的高温、高压、油污等影响问题,提出了基于122 GHz FMCW 测距雷达的活塞位移测量方案。在分析雷达系统结构和工作原理的基础上,分别对调制信号单元、T/ R 收发单元、调理单元和ARM 实时处理单元进行了详细设计,一方面采用集成设计思路缩小了系统体积,满足了液压储能器内安装测试需求,另一方面通过设计聚焦透镜,提高了122 GHz 毫米波在液压储能器内部的穿透能力。实验结果表明,在2 m 液压储能器活塞测试中,122 GHz FMCW 测距雷达能够耐压30 MPa,测距误差不超过2 cm。     

单部雷达侦察机无源测距新探

本文探讨了单部雷达侦察机无源测距新的基本原理，给出了该测距模块的分析与综合、测距精度以及其它有意义的结果，单部雷达侦察机同时具备了测距功能，无疑将具有重大的军事价值。     

基于FPGA的雷达测距设计

介绍了利用现场可编程门阵列(FPGA)技术来实现雷达测距的方式,论述了该系统的硬件结构组成和功能。针对测距处理的特点和要求,充分利用了FPGA的高速灵活的可编程资源,应用VHDL语言编程实现测距的硬件设计,既提高了处理速度和精度,又具有可编程的灵活性。经验证该设计能够完成测距处理,工作性能良好。     

94 GHz three-dimensional imaging radar sensor for autonomousvehicles

The authors report on using millimeter-wave images for real-time vehicle guidance. For application in the field of autonomous locomotion, the main advantage of this sensor concept is direct access to range and velocity information. System design and imaging results of a multitask 94-GHz pulse Doppler radar with 25-cm radial and 1.5° angular resolution are discussed. To point out specific millimeter-wave scattering phenomena, various radar images of typically structured indoor situations are presented. Extraction of information from sensor data, for example, obstacle detection, is demonstrated by radar image processing     

调频连续波SAR非线性处理方法研究

合成孔径雷达系统畸变引入的幅相误差严重影响了雷达的成像效果,必须予以校正才能获得高质量的图像。该文针对调频连续波SAR系统频率响应非理想特性引入的幅相误差以及信号扫频非线性误差对系统性能的影响,分析建立了存在系统误差的调频连续波SAR系统回波信号模型,研究了系统误差估计与校正的问题,并考虑小型化调频连续波SAR实时成像处理的需求,提出了一种改进的适合实时成像处理的调频连续波SAR的高精度非线性距离-多普勒成像处理算法。最后,通过理论推导和仿真分析,验证了算法的可行性和有效性。     

A 77 GHz FMCW radar transmitter with reconfigurable power amplifier in 65 nm CMOS

A frequency modulated continuous-wave (FMCW) radar transmitter in 65 nm CMOS is presented. The transmitter consists of one FMCW signal generator, one reconfigurable power amplifier and bias circuits. FMCW chirp signal comes from a sigma-delta modulated fractional-N phase-locked loop (PLL) with an integrated digital triangle-wave generator to control the output division-ratio of the sigma-delta modulator. A four-way power combining power amplifier is employed to improve the output power with a reconfigurable output power to satisfy different detection distance requirements. The measured results show that the chirp bandwidth achieves 2 GHz, from 76 GHz to 78 GHz, and the power amplifier achieves 13.1 dBm output P1dB with 8.1% PAE. The power amplifier and FMCW signal generator consume 228 mW and 56 mW power, respectively, with a 1.0 V power supply. The core die area is only 2.6×0.88 mm².     

Fin-line PIN-diode attenuators and switches for 94 GHz range

The letter reports new results of fin-line PIN-diode attenuators and switches for the 94 GHz range. Design and performance of SPST and SPDT switches?single-pole single-throw and single-pole double-throw, respectively?will be presented. The attenuation of the SPST switch, for example, can be adjusted between 2 and 35 dB over the entire waveguide band from 75 to 110 GHz.     

大量程低成本高精度便携式电子称重系统

大量程的称重系统难以实现便携与高精度,而高精度的称重系统量程较小。该文通过力转换结构及改进的惠斯通电桥,运用快速高分辨信号采集及处理技术,设计了一种兼具高精度、大量程、便携式、低成本等优点的电子称重系统。实测结果表明,设计的电子称重系统称量范围0~8 kN,误差＜0.1%,阈值及分辨率为0.1 kg,可用于科研、建筑工地、牲畜交易等领域。     

线性FMCW雷达动目标一维距离像运动补偿

线性FMCW雷达是一种高距离分辨率雷达,运动补偿是其实现距离高分辨率的核心技术.采用多重复频率波形,提出一种多普勒频率串算法,从模糊的速度估计中恢复目标的真实速度,采用运动补偿得到高分辨的距离估计.同时为解决多目标分辨的问题,采用一种基于目标均方误差的配对算法.仿真结果表明多普勒频率串算法较中国余数理论对速度估计的性能有了明显的提高,充分说明了DFC算法的有效性.     

High-resolution automobile FMCW SAR and signal processing

The paper presents a high-resolution automobile Frequency Modulation Continuous Wave Synthetic Aperture Radar （FMCW SAR） named MiniSAR and the procedure of its signal processing. The imaging geometry of automobile SAR is very different from that of airborne SAR, leading to a different data processing method for automobile SAR. Therefore, in the paper, we propose an image formation approach that can well handle the focusing issues of automobile SAR. The effects of the strong reflected signal and the spatial-variant synthetic aperture length are analyzed. The processed results with automobile FMCW SAR read data validate the presented method.     

FMCW radar range estimation algorithm based on fast iterative interpolation

For the multi-target detection,a multi-objective range estimation algorithm was proposed based on iterative interpolation to solve the problem of the range accuracy of frequency modulation continuous wave (FMCW) radar being easy to be interfered by spectrum.Firstly,the number of targets and the rough location of the target were obtained through the fast Fourier transform (FFT) and the constant false alarm (CFAR) detection algorithm.Then spectrum was iteratively interpolate,and the inter-spectral interference was eliminated during each iteration to obtain more accurate distance.Simulation results show that the proposed algorithm has higher estimation accuracy in multi-target environment and low Signal-to-noise ratio(SNR).The proposed algorithm is implemented by DSP,which proved that the algorithm meets the real-time requirements and is easy to be implemented in engineering.     

WIDE SWATH FMCW SAR DATA PROCESSING IN SQUINT MODE简

This paper concentrates on the data processing of Frequency Modulation Continuous Wave （FMCW）, Synthetic Aperture Radar （SAR） in the case of wide swath and squint mode. In the mode, the Doppler centroid dramatically varies along slant range compared to conventional pulsed-SAR. This poses a challenge for system design and signal processing since a very large azimuth bandwidth would be introduced. In the paper, we accommodate the Doppler centroid variations with range by an im- proved spectral-length extension method, where a bulk range shift and updated Doppler centroid variations are introduced to greatly reduce the azimuth aliasing with respective to the existing methods Moreover, an image formation approach that integrates wave number domain algorithm is presented to focus the raw data of FMCW SAR in the case of wide swath and squint mode. Point target simulation experiment demonstrates the advantages of the presented method.     

相干连续波激光雷达的参数设计与实现

近年来,光学器件和数字化处理技术的高速发展为全光纤相干连续波激光雷达探测系统的小型化提供了基础。该雷达具有测速精度高、距离分辨率高、体积小、重量轻、易于装载等特点。本文首先介绍全光纤相干连续波激光雷达的测距测速原理,其次针对全光纤相干连续波激光雷达的性能指标设计了一套波形参数,并对该模型进行仿真实验,最后进行外场实际测量。仿真数据和实验数据均表明,利用该参数可以达到高的距离分辨力(1 m),大的速度可测范围(-100 ~100 m/s),高的速度准确率(0.5%),完成了设计指标。Abstract：关键词：Key words：