Most Viewed Content:

Xiaomi 12S Ultra Review: 2022 Smartphone Photography Standard

the Xiaomi 12S Ultra is a bold statement and reaffirms Xiaomi as a company capable of holding its own in the flagship smartphone space. That's aside from the fact that Xiaomi is one of the biggest mid-range smartphone brands.

Xiaomi 12S and 12S Pro Revealed With A New Processor

Xiaomi is now on a device launching spree as it is set to launch the Xiaomi 12S and 12s Pro with a new Snapdragon processor.

Major breakthrough in the Development of Coherent Wind Measurement Lidar System at USTC

Xue Xianghui, a professor in the School of Earth and Space Sciences at the University of Science and Technology of China (USTC), has made a major breakthrough in the development of a coherent wind measurement lidar system, achieving the first wind field detection with a spatial resolution of 3 meters and a temporal resolution of 0.1 seconds. It is reported that this is the most accurate continuous wind field detection in the world reported so far. The related results were published in the internationally renowned optics journal Optics Express.

The wind measurement lidar package prototype. Photo by the research team

Atmospheric wind field detection with the meter-subsecond resolution is of great significance in aerospace safety, high-value target assurance, and numerical weather prediction, but continuous wind field observation with the high spatial and temporal resolution is still a challenge for lidar. For example, in order to obtain 3-meter and 0.1-second spatial and temporal resolution wind field observation results, the existing LIDAR signal detection sensitivity needs to be improved by more than two orders of magnitude.

In order to achieve a high spatial and temporal resolution wind measurement lidar that can “see far, see fine, measure fast and measure accurately”, the team optimized the lidar in terms of laser light source, optical transceiver system, high-speed data acquisition circuit and data processing algorithm, and proposed a new inversion algorithm based on time-frequency analysis and pulse coding. The team proposed a new inversion algorithm based on time-frequency analysis and pulse coding, which greatly improved the accuracy and robustness of wind field inversion, and finally realized a set of fully localized “product-level” test prototype.

According to the introduction, the radar prototype works at 1550.1 nm, which has the characteristics of human eye safety, light equipment (40 kg for the whole equipment), stable work, and strong environmental adaptability.

Through the field comparison test, the radar prototype wind field observation results and the calibration equipment comparison error is less than 0.5 meters per second.

To further test the radar observation performance and environmental adaptability, the team measured the wind field structure in the wake stream of high-speed trains in the field at the high-speed railway station in Suzhou, Anhui Province. The radar worked continuously and stably for more than 100 hours unattended and obtained continuous observations of the high-speed train wake flow at 350 km/h at the high temporal resolution of 3 m and 0.1 s. For the first time, the lidar was used to capture the wind field structure in the high-speed train wake flow similar to the von Kammen vortex street, which was highly consistent with the results of computational fluid dynamics simulations.

The reviewers concluded that “the observations are striking and impressive” and “the first high-resolution results of continuous observations to date.”

Latest

Newsletter

spot_img

Don't miss

Threza Gabriel
Threza Gabrielhttps://www.techgoing.com
TechGoing is a global tech media to brings you the latest technology stories, including smartphones, electric vehicles, smart home devices, gaming, wearable gadgets, and all tech trending.
spot_imgspot_img

Chip lead times have been shortened for three consecutive months, but shortages remain a problem

New research shows that chip delivery times are decreasing, but shortages remain a problem in many areas, Bloomberg reports. According to Susquehanna Financial Group's research,...

Xiaomi Watch S1 Pro released: Sapphire Glass Mirror + Stainless Steel Body, from 1499 yuan

August 11, tonight, Xiaomi released Xiaomi Watch S1 Pro, with sapphire glass mirror + stainless steel body design, the first issue from 1499 yuan. The...

Infineon chips revealed to be defective, disrupting Hyundai’s popular pure electric car delivery plan

Automotive chip giant Infineon has been exposed to product defects that may cause Hyundai to delay deliveries. on July 4, the Korea Economic Daily...