FMCW ALTIMETER PDF

For those interested, here is a technical overview of the structure and function of a radar altimeter. Frequency working range A radar altimeter operates in a high-frequency frequency range of several gigahertz GHz. For comparison: The radio-UKW range is in a frequency range of approx. This high-frequency signal is emitted into the room via an antenna as an electromagnetic wave. It illustrates a linear change in frequency over time frequency modulation in the form of a triangular signal. Figure 1: Triangular frequency modulation Signals in Time Domain Figure 2 shows three plots in the time domain.

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It is primarily used to determine height above ground and is therefore used to measure ground distance in avionics for flying objects. It transmits a frequency-modulated signal via a radar antenna, which propagates in space. If the electromagnetic wave hits an obstacle, the radar wave is either reflected or attenuated, depending on the material properties.

With a FMCW radar sensor the height above ground can be determined. The main obstacle is the ground itself. It reflects the radar wave and in a receiving antenna in the FMCW radar sensor the reflected wave is detected, converted into an electrical signal and on the basis of the transit time, that the signal needs for the distance covered, a frequency difference proportional between transmitted and received signal can be determined.

This frequency difference correlates with the distance. Advantages For pilots of small aircraft, it serves as an additional measuring instrument, which is of great help especially during the critical landing procedure and significantly increases safety, since the device can determine and output the actual distance to the ground in real time.

Base for automated landing systems: For example, ummanned flying objects such as remote-controlled drones or aircraft can be equipped with a FMCW Radio Altimeter to arrive safely on the ground as part of an automatic computer-controlled landing procedure — equip your drone with it!

Measuring distance over several hundred meters In contrast to optical systems for distance measurement, a radio altimeter is relatively insensitive to impurities and weather-related factors such as fog, clouds or rain. Modern fast microprocessor technology combined with intelligent digital signal processing allows precise measurements, very short measuring intervals and thus a high measuring frequency.

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FMCW Radar

It is primarily used to determine height above ground and is therefore used to measure ground distance in avionics for flying objects. It transmits a frequency-modulated signal via a radar antenna, which propagates in space. If the electromagnetic wave hits an obstacle, the radar wave is either reflected or attenuated, depending on the material properties. With a FMCW radar sensor the height above ground can be determined. The main obstacle is the ground itself. It reflects the radar wave and in a receiving antenna in the FMCW radar sensor the reflected wave is detected, converted into an electrical signal and on the basis of the transit time, that the signal needs for the distance covered, a frequency difference proportional between transmitted and received signal can be determined. This frequency difference correlates with the distance.

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ALT-8000 FMCW/Pulse Radio Altimeter Flight Line Test Set

Alexander V. Nebylov1 and Felix J. A crew or a control system needs information about altitude with respect to the ground level over the entire flight. Altimetry is the art of measuring altitude, and an altimeter is a sensor that measures the altitude of a flying vehicle.

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