Namely, in this paper we are using the Kirchhoff approximation  in order to obtain simulation results for the backscattered radar signal amplitude as a function of radar frequency
, therefore a 'spectral method' .
Figures 5(a) and (b) show the bandwidths [delta][f.sub.pp] obtained by (19) and (23) at L-band (1.3 GHz) radar frequency
. As shown in Figs.
On September 9, 2008, Congress was notified of a possible sale of 12 AH-64D APACHE Longbow Helicopters, along with 30 T700-GE-701D Engines, 12 Modernized Targeting Acquisition and Designation Systems/Pilot Night Vision Sensors, 4 each AN/APG-78 Fire Control Radars and AN/APR-48 Radar Frequency
Interferometers, 28 M299 HELLFIRE Longbow Missile Launchers, 12 AN/ALQ-144C(V)3 Infrared Jammers, 12 AN/APR-39A(V)4 Radar Signal Detecting Sets, 12 AN/ALQ-136(V)5 Radar Jammers, 12 AAR-57(V)3/5 Common Missile Warning Systems, 36 Improved Countermeasures Dispensers, and 12 AN/AVR-2B Laser Warning Sets.
Other items in the October Apache package included 30 modernized target acquisition designation sight/pilot night vision sensors, 17 AN/APG-78 fire control radar and AN/APR-48 radar frequency
interferometers, 69 T700-GE-701D turbine engines, 1,000 AGM-114L Longbow Hellfire missiles, and 66 M299 Hellfire Longbow missile launchers.
The AH-64D Longbow remanufacture effort incorporates a millimeter wave fire control radar (FCR), radar frequency
interferometer (RFI), fire-and-forget radar-guided Hellfire missile and cockpit management and digitization enhancements.
It is carried out by a series of modulated and unmodulated pulses in the radar frequency
, which can be synchronous or non-synchronous with the radar pulse frequency.
In response to the needs of civil and military radar manufacturers, single bipolar transistors capable of producing 300 W of pulsed RF power have been developed for the more common radar frequency
The advantages of the lower radar frequency
bands are clear, and as solid-state devices attain higher efficiencies and power levels they will supplant tubes as RF sources.
As an interrogation signal, the normal radar frequency
and signal format were used, while the transponder's reply was transmitted on another frequency and received by the Gemse receiver.
Contacts often reflect radar energy differently (radar cross section) depending on the relative viewpoint and radar frequency
. Consequently, processing data in near real-time from many different radars operating on many frequencies doesn't just produce a better tactical picture, it delivers collective battle space clarity.
The AAIB said to reduce the number of messages crews received in the immediate post take-off period, an instruction given to pilots about switching radar frequency
was given out by Birmingham controllers at the same time as clearance for take-off.
The reason for this is that void size is inversely proportional to the radar frequency
used to find it.