Mell What are the factors affecting radar range?
What factors affect Maximum Range of RADAR?
- FREQUENCY. The higher the frequency of a radar (radio) wave, the greater is the attenuation (loss in power), regardless of weather.
- PEAK POWER. The peak power of a radar is its useful power.
- PULSE LENGTH.
- PULSE REPETITION RATE.
How does frequency affect radar?
Frequency is a fundamental property of any radar instrument since it directly affects measurement performance in various ways. When propagating through a medium, radar signals are absorbed and the signal strength decreases. High-frequency signals suffer more attenuation than low- and mid-frequency signals.
What determines the range resolution in radar?
Range resolution is the ability of a radar system to distinguish between two or more targets on the same bearing but at different ranges. The degree of range resolution depends on the width of the transmitted pulse, the types and sizes of targets, and the efficiency of the receiver and indicator.
What is the frequency range of radar?
16.1 Radar Frequency Bands
Radar Band Frequency (GHz) Wavelength (cm) C 4–8 7.5–3.75 S 2–4 15–7.5 L 1–2 30–15 UHF 0.3–1 100–30 What is the accuracy of radar?
Practically, the accuracy depends on the size of the individual range-cells in signal processing. ICAO recommends[3] a range cell size of 1/128 NM, i.e. about 14.5 m, for air traffic control air surveillance radar, which corresponds to a time interval of almost 10 nanoseconds.
What is radar maximum range?
Maximum Range: Radar Max Range is determined, ideally speaking, on the properties of the antenna only. A signal at a certain frequency is transmitted, reflected, then hopefully, detected. Due to the three-dimensional propagation of radar waves, frequency hold the highest weight in determining range.
What is maximum range and pulse recurrence frequency?
Rmax must be larger than the Maximum Display Range (so-called: instrumented range). Consider radar with pulse repetition frequency 1 000 Hz. The pulse period is its reciprocal value and is 1/ 1 000 = 1 ms. According to formula (2) the maximum unambiguous range of this radar is 150km.
What is the maximum range of radar?
Therefore, the maximum range of Radar for given specifications is 128KM.
How fast does a radar signal travel?
Radar waves travel through the atmosphere at roughly 300,000 km per second (the speed of light). The range to a target is determined by measuring the time that a radar signal takes to travel out to the target and back.
How does radar improve range resolution?
Radar using Intrapulse-Modulation This allows very high-resolution (and a small radar range resolution cell) to be obtained with long pulses, thus with a higher average power. Figure 4 shows the variation of slant range resolution with bandwidth.
Can radar detect humans?
Doppler radar cannot detect humans who are stationary or walking across the radar’s field of view. The radar can only detect the motion components that are directed towards to or away from the radar. However, if the environment does not contain any strong radar reflectors, the system can also be used when moving.
Which frequency band has the farthest range?
Extremely High Frequency (EHF) Extremely high frequency band is the highest in RF frequency spectrum which range between 30 GHz and 300 GHz.
How is the range of a radar determined?
The characteristic of the magnetron output pulse that relates to accurate range measurement is its a. Amplitude b. Decay time d. Duration 11. The minimum range of a radar is determined by a. The frequency of the radar transmitter b. He pulse repetition rate c. The transmitted pulse width d. The pulse repetition frequency 12.
When does the Doppler frequency of a radar increase?
1. The Doppler frequency is large if 2. If peak transmitted power in a radar system is increased 16 times, its maximum range will be increased by a factor of 3. Radar range primarily depends upon 4. Which statement (s) regarding the working of a radar system is/are wrong?
How does the reflectivity of a radar system work?
It is a measure of the efficiency of a target in intercepting and returning radio frequency energy. Thus, a weather radar system provides a value of “efficiency” with which targets in the atmosphere return the energy transmitted by the radar.
What happens to the return power of a radar antenna?
The average return power varies directly with the Pt. As a result, a doubling of the transmitted power (with no other changes) would double the average returned power. Cutting Pt in half would result in half the average return power. G is the gain of the radar antenna.