Maintain and repair Bridge Navigation Equipment and ships communication systems| RADAR Maintenance
Summary
TLDRThis video explains how marine radar systems work, using electromagnetic waves to detect objects and calculate their distance, velocity, and direction. It describes the key components of a radar system, including the transmitter, scanner, receiver, and display unit. The radar continuously sends out signals, detects echoes from objects, and calculates their position relative to the ship. The display unit shows targets as blips, and the radar system helps navigators with obstacle detection and safe navigation. The system's basic principle relies on the reflection of electromagnetic waves, making it essential for maritime operations.
Takeaways
- 😀 Radar is based on the principle of electromagnetic waves that help determine the location, velocity, direction, and altitude of objects, whether moving or stationary.
- 😀 The speed of electromagnetic energy in the air is constant at 300,000 km per second, equivalent to the speed of light.
- 😀 The radar antenna continuously rotates and sends high-speed signals to detect objects within its path.
- 😀 If there are no objects in the radar's path, the radar screen will remain blank.
- 😀 When an object is detected, it reflects the electromagnetic waves back to the radar, allowing the system to calculate the distance and location of the object.
- 😀 The radar system determines two key factors: the position and the direction of the object.
- 😀 The radar system works by sending out pulses that are reflected back by objects, allowing the computer to calculate the distance using the speed-time formula.
- 😀 Marine radar consists of four main units: the transmitter, scanner, receiver, and display unit, each playing a critical role in the radar's operation.
- 😀 The transmitter sends out bursts of electromagnetic energy, while the receiver processes these echoes to display a blip on the radar screen.
- 😀 The display unit shows a bird's eye view of the detected targets, represented by bright spots called blips, and the range can be adjusted as needed.
- 😀 When an echo is received, the blip on the screen momentarily brightens and fattens, indicating the presence of a target.
Q & A
What is the basic principle behind how marine radar works?
-Marine radar works on the basic principle of electromagnetic waves. The radar antenna sends high-speed electromagnetic waves, which reflect off objects, helping to determine the location, distance, velocity, and direction of those objects.
What does the term 'Veda' refer to in the context of radar?
-'Veda' is an acronym for 'Radio Detection and Ranging,' which describes how radar systems detect objects by emitting and receiving radio waves.
How does electromagnetic energy travel through the air in radar systems?
-Electromagnetic energy travels through air at the speed of light, approximately 300,000 kilometers per second.
What happens when a radar pulse encounters an object?
-When a radar pulse encounters an object, the pulse reflects back to the radar, allowing the system to calculate the distance, location, and direction of the object.
What is the role of the radar antenna in marine radar systems?
-The radar antenna continuously rotates on top of the ship, sending and receiving electromagnetic pulses to detect objects in all directions around the ship.
How does the radar system calculate the distance of an object?
-The radar system calculates the distance of an object by measuring the time it takes for the pulse to travel to the object and back. This time is then used in the formula: distance = speed × time.
What are the main components of a marine radar system?
-A marine radar system consists of four main units: the transmitter, the scanner, the receiver, and the display unit.
What is the purpose of the pulse repetition frequency (PRF) in radar systems?
-The pulse repetition frequency (PRF) determines how often the radar sends out electromagnetic pulses. These pulses are reflected by objects and return as echoes, which the radar system processes.
How does the display unit of a radar system present the information?
-The display unit shows a rectangular screen with a circular area known as the Plan Position Indicator (PPI), which provides a bird’s eye view of target positions. Bright spots, or 'blips,' are displayed on this screen to indicate objects detected by the radar.
What is the significance of the 'trace' in radar readings?
-The trace is a visible radial line created by a moving bright spot on the radar screen. It represents the path of the radar pulse over time and helps track objects as the radar antenna sweeps.
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