Pulsed Noise Radar – Media Overview
Pulsed Noise Radar: Overview
Welcome to the overview page on media on pulsed noise radars.
We selected the following information on pulsed noise radars for you:
We attribute this type of pulse radar implementation particular importance. One reason is that the Skyradar Modular Radar Training System has been implemented on the basis of a pulsed noise radar. But the main reason is that the pulsed noise radar technique (“PN”, also “stealth radar” or “noise radar”) is a modern and handy way of implementing a Pulse Radar; it works with a noise signal or a chaotic or random modulation or pulse train as the transmission signal. The echo signal is detected using a perfectly tuned receiver and the correlation of the signal with the delayed transmitted signal. Usually a high-frequency noise source is used directly as the transmission signal generator. In addition, sending a continuous sinusoidal-wave, which is amplitude, phase or frequency modulated by a noise source is possible. This has advantages in signal processing as it results in lower range or time side-lobes as well as a better energy balance when higher pulse powers cannot be achieved. In addition, this signal has a narrower bandwidth and so the receiver can have a lower dynamic range.
Significant improvements in military radar systems can be realized with the application of pulsed noise radar technologies for an extended military use. For example, in situations where it was previously not possible to use radar without the radar platform at the same time being exposed (stealth radar). Pulsed noise radar techniques can provide the best results during a military operation in a hostile environment, at the same time there is an extremely low probability of the location being detected (low probability of interception, LPI). However, this application requires some special features:
- A customized noise source with broadband transmission amplifier,
- Optimally coordinated multi-channel digital receiver with pulse compression,
- A broadband antenna, etc.
In the Pulsed noise radar, the measurement of the transit time and thus of the distance must be carried out by correlating the modulation of the transmitted and received signal. The spectrum of the modulating function determines the way, in which this correlation needs to be performed depending on the distance to a reflecting target for outputting a measured value. In practice each target distance must have its own delay line established. Steps must also be small enough to get a good distance resolution. The number of filter channels limits the range of these pulsed noise radar systems. Theoretically, both amplitude and frequency modulation can be used but frequency modulation some advantages over other types of modulation due to its limited reactivity on disturbances. This system can replace conventional radar altimeter and effectively avoids ambiguities in the distance measurement, that can occur in conventional pulse radar or FMCW radar implementations. It also avoids the systematic measurement error of these systems and is able to work with a precision of a few tens of centimeters. This even makes it suitable for an instrument landing system.
Information about SkyRadar’s modular radar solutions can be found here: SkyRadar Modular Radar Training System.
Read more on the noise radar in the portal RadarTutorial.eu.