IEEE - Aerospace and Electronic Systems - January 2020 - 2

In This Issue -Technically
CALIBRATION METHOD OF LASER DETECTION SYSTEM WITH POSITION
SENSITIVE DETECTOR
Calibration of a laser detection system (LDS) is crucial to the laser-guided weapons. This article proposes a calibration method of the LDS with installation errors. To solve this problem,
the error sources of the LDS are analyzed and the error sources are classified into two categories: installation angle errors and installation displacement errors. The main contributions are
that a measurement model of the two error sources is deduced and the detailed calibration steps
are given with the help of a three-axis turntable. An experimental study on physical calibration
is carried out based on the detailed calibration steps. After calibration, the measured values are
close to the reference value. This calibration method is valuable for application in actual systems, as it only needs one turntable to calibrate the LDS. Test results verify the validity and
feasibility of this method.

ENTOMOLOGICAL RADAR OVERVIEW: SYSTEM AND SIGNAL PROCESSING
Insect migration is a significant ecological phenomenon in nature, and difficult to directly observe
because insects are small and fly hundreds of meters above the ground at night. Radar, working in allweather and all-time conditions, remains one of the most effective tools for observing insect flight. This
paper reviews the developments of radar systems and signal processing methods in radar entomology.
Typical insect radar systems and parameter retrieval methods are presented, including that the scanning
insect radar and Vertical Looking Radar (VLR) achieve the retrieval of the insect parameters, such as
density, mass, orientation, wingbeat frequency. In addition, some cases of advanced radar techniques
and signal processing are provided to give insight on current developments of insect parameter retrieval.
For example, a new insect radar system now is being researched and developed in China, which consists of one high-resolution-phased array radar and three multi-frequency and fully polarized radars, by
adopting modern radar techniques, such as high resolution technology, full polarization technology and
distributed radar technology and so on. The new insect radar system will be crucial to monitor insect
migration, both for scientific research and as an early warning system for pests.

GLUE TECHNOLOGIES FOR SPACE SYSTEMS: AN INTRODUCTION TO A NEW AESS
TECHNICAL PANEL
This article aims at introducing to the readers of the AES Magazine the recently constituted
technical panel: "Glue Technologies for Space Systems." A short overview of the technologies
considered in the panel will be provided, along with panel vision and perspectives shared with
the founder members. Some information about panel meetings and participation rules will conclude this article.

RADAR DOPPLER FREQUENCY MEASUREMENTS-ACCURACY VERSUS SNR IN
PRACTICAL PROCESSORS
Radar performs Doppler frequency measurements to determine the range rate of detected targets.
Doppler helps to resolve moving targets and stationary clutter located at the same spatial cell. Doppler is also used to reduce the azimuth resolution in SAR. Most often, the two-way nature of radar
and the prevailing clutter, require reception and processing at low-signal-to-noise ratio (SNR).
However, there are also high-SNR radar scenes, e.g., a single target in front of clear background.
Doppler is also used in one-way applications such as navigation systems or transponder carrying
radar targets. In those applications, the SNR can be relatively high. With a tutorial flavor, the article
discusses and compares three frequency measuring methods that fit one or both scenes-low SNR
and high SNR. The discussion revisits early applications of frequency measurements such as the
TRANSIT satellite navigation system and the pulse-pair technique of spectral measurement used in
weather radar.

IEEE A&E SYSTEMS MAGAZINE

JANUARY 2020

IEEE - Aerospace and Electronic Systems - January 2020

Table of Contents for the Digital Edition of IEEE - Aerospace and Electronic Systems - January 2020