Range-Doppler Imaging of Rotating Objects

Walker, Jack L., "Range-Doppler Imaging of Rotating Objects," Aerospace and Electronic Systems, IEEE Transactions on , vol.AES-16, no.1, pp.23,52, Jan. 1980
doi: 10.1109/TAES.1980.308875

Abstract: During the integration time required to obtain fine Dopplerfrequency resolution in a range-Doppler imaging radar, a point on a rotating object may move through several range and Doppler resolution cells and produce a smeared image. This motion can be compensated by storing the appropriately processed return pulse, and the angular coordinates are determined by the angular coordinates of the radar antenna. The resulting stored data represents the three-dimensional Fourier transform of the object reflectivity density, and hence can be processed by an inverse Fourier transformation. Also included is an analysis of the three-dimensional radar/object geometry with separate source and receiver locations. The effects of various system aberrations are investigated and experimental results from a microwave test range which demonstrate the image improvement are presented.

Reference

Antenna Effects in Depolarization Measurements

Blanchard, A.J.; Jean, Buford Randall, "Antenna Effects in Depolarization Measurements," IEEE Transactions on Geoscience and Remote Sensing, vol.GE-21, no.1, pp.113,117, Jan. 1983, doi: 10.1109/TGRS.1983.350537

Abstract: The depolarization of electromagnetic energy scattered from natural terrain has been of interest to experimenters and theoreticians for many years. However, the reported measurements have not agreed with theoreticaly predicted results. Boresight axial ratio has commonly been used as a figure of merit to describe the polarization isolation properties of the measurement system antennas. Since depolarization measurements from terrain involve extended targets which fill the full antenna beam, boresight axial ratio is often an inadequate measure of antenna polarization purity. This paper describes antenna isolation characteristics which impact the quality of the depolarized measurements. Representative calculations demonstrate the effects of nonideal antenna systems on the observed measurements. A criterion for antenna specification is given which will provide high-quality cross-polarized measurements.

Source

AN/MPQ-46 HAWK High Power Illuminator (HIPIR) Radar

Характеристики зенитного комплекса "Панцирь-С"

ВВС России приняли на вооружение первые десять зенитных ракетно-пушечных комплексов "Панцирь-С", сообщил РИА Новости пресс-секретарь управления пресс-службы и информации Минобороны РФ по ВВС подполковник Владимир Дрик.

Комплекс был создан в 1994 году и впервые продемонстрирован на авиасалоне в Москве "МАКС-1995". С того времени комплекс был значительно модернизирован, последняя известная модификация демонстрировалась на "МАКС-2007". Предполагается, что в будущем "Панцирь-С" полностью заменит в российской армии ЗРПК "Тунгуска".

Зенитный ракетно-пушечный комплекс "Панцирь-С" предназначен для противовоздушной обороны малоразмерных военных и административно-промышленных объектов и районов от самолетов, вертолетов, крылатых ракет и высокоточного оружия, а также для усиления группировок ПВО при отражении массированных ударов с воздуха.

Source

AN/MPQ-48 Improved Continuous Wave Acquisition Radar

LONGBOW LLC Awarded $86 Million to Support and Sustain U.K. Apache Attack Helicopters

ORLANDO, FL, February 22nd, 2010 — The LONGBOW Limited Liability Company, a joint venture of Lockheed Martin and Northrop Grumman, was recently awarded an $86 million contract from AgustaWestland to support LONGBOW FCR systems on the United Kingdom Apache AH Mk-1 aircraft.

“The LONGBOW FCR is an essential element of U.K. Apache operations in Afghanistan,” said Jerry Garman, LONGBOW LLC president and director of LONGBOW programs at Lockheed Martin Missiles and Fire Control. “Through this partnership with AgustaWestland, we will ensure the highest operational availability and system reliability at the lowest sustainment cost”.

The four-year contract includes engineering services, integrated logistics and an in-country repair capability. Support services will continue through March 2014, and will be performed at Wattisham Airfield in the U.K.; Lockheed Martin facilities in Ocala and Orlando, FL; and Northrop Grumman facilities in Baltimore, MD.

The contract is a component of the integrated operational support provided by AgustaWestland to the Ministry of Defence. A formal signing ceremony at the U.K. Apache main operating base at Wattisham Airfield in October marked the launch of this effort.

For more than a decade, the LONGBOW FCR has provided Apache aircrews with target detection, location, classification and prioritization. In all weather, over multiple terrains and through any battlefield obscurant, the radar allows automatic and rapid multi-target engagement. The LONGBOW FCR integrates with the M299 smart launcher and the LONGBOW HELLFIRE missile, enhancing the Apache’s lethality fourfold and increasing survivability sevenfold.

Northrop Grumman Corporation is a global defense and technology company whose 120,000 employees provide innovative systems, products and solutions in information and services, electronics, aerospace and shipbuilding to government and commercial customers worldwide.

Source: Lockheed Martin