Projects and notes by Zhengyu Peng — radar, RF engineering, software and robotics.https://zpeng.me/https://zpeng.me/2024/09/12/hexapod/https://zpeng.me/2024/09/12/hexapod/This agile, 3D-printed hexapod robot, powered by ESP32 and Arduino, features a robust and durable structure, smooth and nimble movement, and WiFi-enabled remote control. It also supports over-the-air (OTA) firmware updates for effortless maintenance.Thu, 12 Sep 2024 00:00:00 GMTHexapodToyhttps://zpeng.me/2023/01/18/smarty/https://zpeng.me/2023/01/18/smarty/Wed, 18 Jan 2023 00:00:00 GMThttps://zpeng.me/2020/11/11/sensorview/https://zpeng.me/2020/11/11/sensorview/A desktop workbench for exploring multi-sensor logs: filter the frame table, inspect a radar point cloud, camera frame and 1D curves for the same instant, and run six linked statistical views, all driven by one frame slider.Wed, 11 Nov 2020 00:00:00 GMTDashData analysisPlotlyRadarVisualizationhttps://zpeng.me/2019/02/11/antenna-array-analysis/https://zpeng.me/2019/02/11/antenna-array-analysis/Mon, 11 Feb 2019 00:00:00 GMTAntenna ArrayPythonSimulationhttps://zpeng.me/2018/05/01/tx-line-calculator/https://zpeng.me/2018/05/01/tx-line-calculator/A transmission line calculator for RF/microwave engineers. Background This project started as a part-time hobby during my undergraduate studies. I was taking an RF/Microwave circuits course at the time, and Android was just emerging as a mobile platform. It was a natural exercise to combine what I was learning in class — transmission line theory…Tue, 01 May 2018 00:00:00 GMTAndroidMicrostripSimulationhttps://zpeng.me/2017/09/27/portable-24-ghz-3d-mimo-radar/https://zpeng.me/2017/09/27/portable-24-ghz-3d-mimo-radar/Introduction A K-band MIMO FMCW radar is designed. By combining the concept of MIMO and non-uniformly spaced array, higher angular resolution and three-dimensional beam scanning capabilities can be achieved with a relatively smaller number of Tx and Rx channels in the designed K-band MIMO FMCW radar. The issue of grating lobes for the conventional sparse…Wed, 27 Sep 2017 00:00:00 GMTMIMORadarhttps://zpeng.me/2017/07/04/commprobe/https://zpeng.me/2017/07/04/commprobe/Tue, 04 Jul 2017 00:00:00 GMTPyQTPythonSocketTCPUDPhttps://zpeng.me/2017/01/28/24-ghz-radar-on-chip/https://zpeng.me/2017/01/28/24-ghz-radar-on-chip/Introduction This project aimed at the realization of a single 24-GHz radar transceiver chip with Global Foundry 0.13 µm CMOS process. Using a CMOS process instead of a GaAs process in K-band can lower the cost, which is one of the very important factors for radar applications in consumer electronics and bio-medical. In this project, I…Sat, 28 Jan 2017 00:00:00 GMTIC designRadarhttps://zpeng.me/2017/01/28/c-band-portable-multi-mode-radar/https://zpeng.me/2017/01/28/c-band-portable-multi-mode-radar/Introduction In this project, a portable FMCW-interferometry radar is designed and built, whose operation frequency is at the 5.8-GHz. This radar system can be configured either in the FMCW or interferometry mode by means of an on-board micro-controller. This design features low-cost and portable. Experiments were carried out to reveal the capabilities of the radar…Sat, 28 Jan 2017 00:00:00 GMTMicro-DopplerRadarVital signhttps://zpeng.me/2017/01/28/k-band-2d-rf-beamforming-fmcw-radar/https://zpeng.me/2017/01/28/k-band-2d-rf-beamforming-fmcw-radar/Introduction In this project, a K-band portable FMCW radar with beamforming array was built. This is the first PCB realization of short-range localization radar with beamforming capability with a range of ±45° in K-band. The phase control for the radar system was realized simply by microwave structure and PIN diodes. As PCB implementation of K-band…Sat, 28 Jan 2017 00:00:00 GMTBeamformingFMCWRadarhttps://zpeng.me/2017/01/28/k-band-portable-multi-mode-radar/https://zpeng.me/2017/01/28/k-band-portable-multi-mode-radar/Introduction In this project, a K-band portable multi-mode radar is designed and built. This radar system can be configured either in the FMCW or interferometry mode by means of an on-board microcontroller. This design features low-cost and portable. Experiments were carried out to reveal the capabilities of the radar system in tracking single and multiple…Sat, 28 Jan 2017 00:00:00 GMTMicro-DopplerRadarVital signhttps://zpeng.me/2017/01/27/ku-band-high-gain-horn-antenna-array/https://zpeng.me/2017/01/27/ku-band-high-gain-horn-antenna-array/Introduction In this work, a 16 x 4 quadrature polarized horn array was designed for satellite communication. This array has 12.5 GHz and 14.25 GHz bands, each band has 500 MHz bandwidth. Design This array and its feeding network were designed with CST Microwave Studio. Some parts of this design can be found on my…Fri, 27 Jan 2017 00:00:00 GMTAntenna ArrayBeamforminghttps://zpeng.me/2017/01/21/adaptive-beamforming-array/https://zpeng.me/2017/01/21/adaptive-beamforming-array/This was the project for my Master Thesis. Some parts of the project have been published in IEEE Antennas and Wireless Propagation Letters and IEEE Transactions on Microwave Theory and Techniques. Introduction In this work, a new concept “complex domain” radio frequency (RF) frontend is proposed, the relatively slowly changed waveform delay information required to…Sat, 21 Jan 2017 00:00:00 GMTAntenna ArrayBeamforminghttps://zpeng.me/2017/01/18/wideband-rf-signal-synthesizer/https://zpeng.me/2017/01/18/wideband-rf-signal-synthesizer/Introduction This was a team project which aimed to evaluate the possibility and performance of a RF signal generator built with off-the-shelf components. This project has both the hardware the software. The hardware part includes a frequency synthesizer, filter array, modulation circuit, power controller and micro-controller. The software part includes micro-controller code, CPLD code and…Wed, 18 Jan 2017 00:00:00 GMTSignal SynthesizerWideband