Pathfinder Radar/Chartplotter Series Service Manual
... Persons with cardiac pacemakers must not engage in service or preventative maintenance of the radar, in close proximity to the magnetron. There is danger of abnormal operation of cardiac pacemakers. ...
... Persons with cardiac pacemakers must not engage in service or preventative maintenance of the radar, in close proximity to the magnetron. There is danger of abnormal operation of cardiac pacemakers. ...
Magnetron Theory of Operation
... frequency vs. time during the period following initial turn on is called the "Thermal Drift" curve. Generally speaking, the maximum drift occurs during the first few minutes after turn on, and slowly approaches equilibrium over a period ranging from 10 to 30 minutes depending upon the structure mass ...
... frequency vs. time during the period following initial turn on is called the "Thermal Drift" curve. Generally speaking, the maximum drift occurs during the first few minutes after turn on, and slowly approaches equilibrium over a period ranging from 10 to 30 minutes depending upon the structure mass ...
Radar 2009 A_6 Detection of Signals in Noise
... Raising threshold reduces false alarm rate and increases SNR required for a specified Probability of Detection ...
... Raising threshold reduces false alarm rate and increases SNR required for a specified Probability of Detection ...
GLOSSARY
... BEAT FREQUENCY OSCILLATOR (BFO) - Any oscillator whose output is intended to be mixed with another signal to produce a sum or difference beat frequency. Used particularly in reception of CW transmissions. BINGO - The fuel state at which an aircraft must leave the area in order to return and land saf ...
... BEAT FREQUENCY OSCILLATOR (BFO) - Any oscillator whose output is intended to be mixed with another signal to produce a sum or difference beat frequency. Used particularly in reception of CW transmissions. BINGO - The fuel state at which an aircraft must leave the area in order to return and land saf ...
RECOMMENDATION ITU-R M.1372-1 - Efficient use of the radio
... (e.g. reflector, slotted array, or distributed phased array). Reflector type antennas typically have average antenna back-lobe levels of –10 dBi. Consequently, back-lobe-to-back-lobe coupling is typically 70 to 80 dB weaker than main-beam-to-main-beam coupling. Slotted array antennas and distributed ...
... (e.g. reflector, slotted array, or distributed phased array). Reflector type antennas typically have average antenna back-lobe levels of –10 dBi. Consequently, back-lobe-to-back-lobe coupling is typically 70 to 80 dB weaker than main-beam-to-main-beam coupling. Slotted array antennas and distributed ...
Radar Transmitter
... 5. RF leakage out of the cathode stem: Typically, an S-band tube may radiate significant VHF and UHF energy as well as fundamental and harmonics out of its cathode stem. This effect varies greatly among different magnetrons, and when it occurs, it also varies greatly with lead arrangements, filament ...
... 5. RF leakage out of the cathode stem: Typically, an S-band tube may radiate significant VHF and UHF energy as well as fundamental and harmonics out of its cathode stem. This effect varies greatly among different magnetrons, and when it occurs, it also varies greatly with lead arrangements, filament ...
Design Infrared Radar System
... Radar can be briefly defined as method of using radio wave to determine the location of objects in space in relation to a known point. More precise definition of radar is that it is an electromagnetic system for detection, location and sometimes for recognition of target objects, which operates by t ...
... Radar can be briefly defined as method of using radio wave to determine the location of objects in space in relation to a known point. More precise definition of radar is that it is an electromagnetic system for detection, location and sometimes for recognition of target objects, which operates by t ...
Airborne Weather Radar - The Aircraft Electronics Association
... • Size of target. • Distance (near/far) of target. • Relative speed of target. These requirements will determine the system basics, such as frequency, pulse width and the pulse repetition frequency. Frequency is fixed by the choice of the magnetron; this is not variable. Pulse width and PRF are dyna ...
... • Size of target. • Distance (near/far) of target. • Relative speed of target. These requirements will determine the system basics, such as frequency, pulse width and the pulse repetition frequency. Frequency is fixed by the choice of the magnetron; this is not variable. Pulse width and PRF are dyna ...
Document
... The back of the pulse at “a” will arrive at “b” at the same time that radiation scattered from objects at the front end of the pulse at “c” will arrive back at “b”. When energy arrives back at the radar, an instantaneous sample will include all radiation scattered between locations b and c: the samp ...
... The back of the pulse at “a” will arrive at “b” at the same time that radiation scattered from objects at the front end of the pulse at “c” will arrive back at “b”. When energy arrives back at the radar, an instantaneous sample will include all radiation scattered between locations b and c: the samp ...
Polarimetric Solid State Radar Design for CASA Student
... To construct and measure parameters for the TR Module and Phase Shifter. Digital Signal Processing. ...
... To construct and measure parameters for the TR Module and Phase Shifter. Digital Signal Processing. ...
History of radar
The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell's seminal work on electromagnetism. However, it was not until the early 20th century that systems able to use these principles were becoming widely available, and it was German inventor Christian Hülsmeyer who first used them to build a simple ship detection device intended to help avoid collisions in fog (Reichspatent Nr. 165546). Numerous similar systems, which provided directional information to objects over short ranges, were developed over the next two decades.The development of systems able to produce short pulses of radio energy was the key advance that allowed modern radar systems to come into existence. By timing the pulses on an oscilloscope, the range could be determined and the direction of the antenna revealed the angular location of the targets. The two, combined, produced a ""fix"", locating the target relative to the antenna. In the 1934–1939 period, eight nations developed independently, and in great secrecy, systems of this type: the United Kingdom, Germany, the United States, the USSR, Japan, the Netherlands, France, and Italy. In addition, Britain shared their information with the United States and four Commonwealth countries: Australia, Canada, New Zealand, and South Africa, and these countries also developed indigenous radar systems. During the war, Hungary was added to this list. The term RADAR was coined in 1939 by the United States Signal Corps as it worked on these systems for the Navy.Progress during the war was rapid and of great importance, probably one of the decisive factors for the victory of the Allies. A key development was the magnetron in the UK, which allowed the creation of relatively small systems with sub-meter resolution. By the end of hostilities, Britain, Germany, the United States, the USSR, and Japan had a wide diversity of land- and sea-based radars as well as small airborne systems. After the war, radar use was widened to numerous fields including: civil aviation, marine navigation, radar guns for police, meteorology and even medicine. Key developments in the post-war period include the travelling wave tube as a way to produce large quantities of coherent microwaves, the development of signal delay systems that led to phased array radars, and ever-increasing frequencies that allow higher resolutions. Increases in signal processing capability due to the introduction of solid state computers has also had a large impact on radar use.