Synthetic Aperture Radar Drone Gets Interferometric Imaging

Relativistic position verification with coherent states

A secure approach to determining the position of an entity can enable schemes such as position-based authorization for transactions and tracking of high-value targets. However, classical methods are incapable of providing secure position verification in the untrusted-prover case, meaning that a prover can mislead verifiers about its actual position. Here we propose and experimentally realize a secure position verification protocol that combines quantum optics and relativity within an information-theoretic framework. Using phase-randomized weak coherent states, two verifiers separated by 2 km securely verify the prover’s position with an accuracy better than 75 m. These results establish secure position-based authentication as a practical possibility, paving the way for applications in financial transactions, disaster response and authenticated secure communications. By combining quantum and relativistic physics, it is possible to verify someone’s position remotely without needing to trust them. Such a position verification protocol has now been introduced and demonstrated with a quantum optics experiment.

ESD eBook September/October 2026: Rethinking Mil/Aero System Design

The ESD September/October eBook explores how embedded system design for military/aerospace applications is changing to meet requirements for more compute, secure connectivity, and real-time control.

HDMI For The Color Computer 2

A hobbyist built a custom HDMI video and audio output adapter for the TRS-80 Color Computer 2, using a Tang Nano board with a Gowin GW1N-1 FPGA to snoop the digital signals feeding the MC6847 video chip and convert them into a modern HDMI signal, plus an analog-to-digital converter to carry the sound over the same cable. The project was born after the maker missed out on commercial CoCoVGA and CoCoDV upgrade boards, which were sold out.

Digital Upgrade Brings Medium Format Camera Into The 21st Century

A hobbyist known as Wenting built an open-source digital back for the Mamiya Super 23 medium format film camera, dubbed the Sitina B220M. It uses a 22 megapixel Kodak KAF-22000CE full-frame CCD sensor that closely matches the exposure area of the original 120 film rolls. The digital processing runs on a Xilinx Zynq 7010 SoC, combining its Cortex-A9 cores with its onboard FPGA. This is a scaled-down follow-up to Wenting's earlier fully custom mirrorless digital camera project, focusing this time solely on the digital back rather than the whole camera body.

Homebrew 68K Machine Has A PCI Bus

A homebrew computer built by maniek86 around a Motorola 68000 CPU running at 10 MHz features a genuine PCI bus, implemented using a Xilinx Spartan II FPGA acting as a PCI bridge and an XC95144XL CPLD for glue logic. The machine has 1 MB of SRAM, 4 KB of ROM, and an MC68681P chip serving as UART, timer, and I/O controller. It offers two 32-bit, 5-volt PCI slots with interrupt support (but no bus mastering), and has been tested with a PCI serial expansion card and a Cirrus VGA adapter. The build is assembled on protoboard rather than a custom PCB, and its creator previously built an FPGA-based 486-compatible single-board computer.

Chiplet-Based FPGAs Optimize Performance for Space Applications

Chiplet-based FPGAs for space applications split compute and I/O to balance processing capacity, radiation tolerance, power, and lifecycle requirements.

Sorter

Satnam Singh đã tạo ra một công cụ Sorter với khả năng sắp xếp danh sách email theo độ quan trọng dựa trên frequency, recency và engagement. Công cụ sử dụng các thuật toán machine learning để phân tích lịch sử tương tác và gán điểm cho từng email. Người dùng có thể cá nhân hóa các tiêu chí sắp xếp để phù hợp với nhu cầu công việc cụ thể. Sorter tích hợp với hệ thống email hiện tại và hỗ trợ cả Gmail và Outlook, giúp tiết kiệm thời gian tìm kiếm email quan trọng.

Sorter cung cấp kiến thức sâu về thuật toán sắp xếp từ chuyên gia hàng đầu Satnam Singh.

Why Raindrops Make For Pretty Good Antennae

Khi bức xạ điện từ đi qua giọt mưa, chúng hoạt động như antenna dipole, phá vỡ sự sắp xếp trung tính và gây ra backscatter mà hệ thống radar thời tiết có thể phát hiện. Hiện tượng này được giải thích bằng regime Rayleigh, cùng cơ vật lý đằng sau tán xạ Rayleigh khiến bầu trời có màu xanh. Video trên YouTube của Marshall Bruner trình bày toán học cơ bản đi kèm với notebook Python mở rộng phép tính cho ai muốn tìm hiểu sâu hơn về permittivity và cường độ tín hiệu moisture-sphere.

Bài viết giải thích cơ chế vật lý thú vị khi giọt nước hoạt động như anten, mang lại hiểu biết sâu sắc về tương tác giữa sóng điện từ và hiện tượng thời tiết.