Abstract
Determination of the signal power-to-noise power ratio on the input and output of reception systems is essential to the estimation of their quality and signal reception capability. This issue is especially important in the case when both signal and noise have the same characteristic as Gaussian white noise. This article considers the problem of how a signal-to-noise ratio is changed as a result of signal processing in the correlation receiver of a noise radar in order to determine the ability to detect weak features in the presence of strong clutter-type interference. These studies concern both theoretical analysis and practical measurements of a noise radar with a digital correlation receiver for 9.2 GHz bandwidth. Firstly, signals participating individually in the correlation process are defined and the terms signal and interference are ascribed to them. Further studies show that it is possible to distinguish a signal and a noise on the input and output of a correlation receiver, respectively, when all the considered noises are in the form of white noise. Considering the above, a measurement system is designed in which it is possible to represent the actual conditions of noise radar operation and power measurement of a useful noise signal and interference noise signals—in particular the power of an internal leakage signal between a transmitter and a receiver of the noise radar. The proposed measurement stands and the obtained results show that it is possible to optimize with the use of the equipment and not with the complex processing of a noise signal. The radar parameters depend on its prospective application, such as short- and medium-range radar, ground-penetrating radar, and through-the-wall detection radar.
Highlights
A characteristic of noise radars is the use of random or pseudorandom signals for probing purposes [1]
As a result of the correlation processing in the noise radar receiver, these signals correlate with each each other as follows: the reference signal with the signal received from the target results in the output other as follows: the reference signal with the signal received from the target results in the output signal SOUT1 (∆T), which is the estimate of the cross-correlation function Rxy,I (∆T) of these signals
Three characteristics PR,OUT were plotted for different values of power PI starting at points (A), 6 shows three of 6, characteristics: of the correlation receiver output
Summary
A characteristic of noise radars is the use of random or pseudorandom signals for probing purposes [1]. The use of signal processors with range-Doppler detection for real-time signal processing has increased the functionality of noise radars. This paper discusses the mutual signal power relations in an actual noise radar solution with a range-Doppler digital correlator. The signal coming from the analyzed target and the signals coming from other targets, leakage signals, and ground-reflected signals are noise signals with zero mean value and Gaussian distribution of probability density For this reason, a classic approach to radar system parameters such as receiver sensitivity, SNR, or detection gain requires determination of the signal and the noise in a noise radar both at the input and at the output of the correlation detector. There is a reference signal σ2 ref that is not required to be equal to a received signal σ2 x as it is in Reference [14]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
