scholarly journals Analysis of the effect of fast and slow multiplicative noise on the distortion of the radiation pattern of the «array-receiver» system.

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
V.M. Artyushenko ◽  
◽  
V.I. Volovach ◽  
Keyword(s):  
Multiplicative Noise ◽  
Beam Pattern ◽  
Signal Duration ◽  
Signal Spectrum ◽  
Smoothing Effect ◽  
Modulation Function ◽  
Receiver System ◽  
Spectrum Width ◽  
Phase Distortions ◽  
Array Receiver

The effect of fast and slow multiplicative noise on the distortion of the beam pattern of the «array-receiver» system in the conditions of the smoothing effect of the receiver and taking into account the time of relative lag from the grating elements was analyzed. Expressions are obtained for instantaneous beam patterns of the «array-receiver» system in the absence and presence of multiplicative noise. It is shown that in the case of action of multiplicative noise the beam pattern of the «array-receiver» system is obtained by averaging the instantaneous pattern on the grating correctness at a time interval equal to the signal duration. Influence of periodic multiplicative noise on distortion of beam pattern of system «array-receiver» is investigted. It is shown that for all signals except frequency-modulated, the beam pattern expression is maximized at the time t0=0. It is also shown that the beam pattern distortion of the «array-receiver» system when exposed to periodic multiplicative noise is less than for the separately considered phased antenna array. The degree of reduction of distortion from smoothing action of matched receiver filter is determined; and the distortion is less, the greater the ratio of the spectrum width of the noise modulation function to the signal spectrum width. Analysis of the influence of fluctuation multiplicative noise on the distortion of beam pattern of «array-receiver» system for the case of matching with signal of receiver filter is performed. The power-average beam pattern of the «array-receiver» system is determined through the energy spectrum of the noise modulation function. It is noted that multiplicative noise, all other things being equal, has less effect on the beam-receiver pattern of the system when using broadband pulse signals without intra-pulse modulation and at the same time resolution in range. It is noted that in case of deep phase distortions for gratings with reversible phases, the distortion of the beam pattern of the «array-receiver» system caused by multiplicative noise is significantly more than those distortions associated with the extremity of the signal spectrum width. The newly smoothing effect of the receiver reduces the expansion of the beam lobe caused by multiplicative noise. An expression is obtained for the average power of the beam pattern of the «array-receiver» system with normally distributed phase distortions of the signal. The effect of the signal duration on beam distortions caused by multiplicative noise was quantified.

Application of Radar Signal Spectrum Width Estimation to Detect Vertical Airflows

2020 ◽  
Vol 45 (12) ◽  
pp. 876-880
Author(s):  
D. A. Denisenkov ◽  
V. Yu. Zhukov ◽  
Yu. V. Kuleshov ◽  
G. G. Shchukin
Keyword(s):  
Radar Signal ◽  
Signal Spectrum ◽  
Spectrum Width

Modeling of the influence of multiplicative interference on the resolution the ability of signals according to the Woodward criterion in aviation and rocket and space applications radio systems

2020 ◽  
pp. 69-81
Author(s):  
В.М. Артюшенко ◽  
В.И. Воловач
Keyword(s):  
Signal Processing ◽  
Time Resolution ◽  
Phase Structure ◽  
Multiplicative Noise ◽  
Radio Signal ◽  
Wide Band ◽  
Signal Duration ◽  
Space Applications ◽  
Radio Systems ◽  
Multiplicative Interference

Рассмотрены и проанализированы алгоритмы моделирования влияния квазидетерминированных и флуктуационных мультипликативных помех на разрешающую способность систем обработки радиосигналов по задержке и частоте на основе критерия Вудворда. Показано, что при очень широкополосных мультипликативных помехах интервал разрешения по времени определяется только огибающей сигнала и не зависит от его фазовой структуры. Для сигналов с прямоугольной и колоколообразной огибающей он равен эквивалентной длительности сигнала. Приведены примеры вычисления интервалов разрешения при воздействии мультипликативных помех. The influence of quasi-deterministic and fluctuating multiplicative noise on the resolution of radio signal processing systems in terms of delay and frequency based on the Woodward criterion is considered and analyzed. It is shown that for very wide-band multiplicative interference, the time resolution interval is determined only by the envelope of the signal and does not depend on its phase structure. For rectangular and bell-shaped envelope signals, it is equal to the equivalent signal duration. Examples of calculation of resolution intervals under the influence of multiplicative interference are given.

Design of an Optical Photon Counting Array Receiver System for Deep-Space Communications

2007 ◽  
Vol 95 (10) ◽  
pp. 2059-2069 ◽  
Author(s):  
Jeffrey A. Mendenhall ◽  
Lawrence M. Candell ◽  
Pablo I. Hopman ◽  
George Zogbi ◽  
Don M. Boroson ◽  
...  
Keyword(s):  
Photon Counting ◽  
Deep Space ◽  
Space Communications ◽  
Optical Photon ◽  
Receiver System ◽  
Array Receiver

scholarly journals MEASUREMENT OF NARROWBAND RESISTANCE FREQUENCY RADIO SIGNAL OF LIMITED DURATION

2021 ◽  
Vol 295 (2) ◽  
pp. 56-63
Author(s):  
S. BARAS ◽  
◽  
L. KRUPELNITSKYI ◽  
O. ONYSCHUK ◽  
◽  
...  
Keyword(s):  
High Speed ◽  
Radio Signal ◽  
Experimental Studies ◽  
Signal Amplitude ◽  
Signal Spectrum ◽  
Time Interval ◽  
Reference Frequency ◽  
Half Cycle ◽  
Spectrum Width ◽  
Limited Duration

The work concerns analog-digital systems that work with radio signals emitted and received by the antenna, and these signals have a limited duration, ie are pulsed. The propagation conditions of such signals and the processes of formation of echo signals affect their amplitude, frequency and phase characteristics in such a way that they form classical narrowband signals. The operation of the system involves the determination of certain parameters of echo signals, and taking into account their pulse nature for such a definition is given a limited time interval. This means that the procedure for determining the parameters must meet the criterion of high speed, and therefore differ from the traditional, built on the use of phase-locked loop. The article is devoted to solving the problem of measuring the reference frequency of a pulsed narrowband radio signal. By analyzing the results of experimental studies, two types of errors in measuring the reference frequency of a narrowband radio signal were identified and the causes of their occurrence were established. These errors are provoked by the peculiarities of the structure of the narrowband signal. The reason for the error of the 1st type, the absolute value of which correlates with the duration of the half-cycle of the reference frequency, is the so-called phase jumps at the point of change of the sign of the bypass. The frequency of such errors within the duration of the echo signal is generally low, although it increases with increasing signal spectrum width. Type 2 errors occur due to the appearance of zones with almost completely suppressed signal amplitude, which may be the result of intrapulse interference and / or signal attenuation. Such errors also occur more often if the spectrum width is larger. A method for measuring the reference frequency of a narrowband pulsed radio signal is proposed, which is based on counting the number of half-cycles of the reference frequency on a time-limited measurement interval and removing from this procedure areas with completely suppressed signal amplitude. An auxiliary highly stable reference frequency is used to establish the numerical value of the reference frequency. The block diagram of the frequency meter and the algorithm of its operation are given, the implementation of which avoids these errors.

scholarly journals Highly Stable Photonic Local Carriers for Phased Array Receiver System

2020 ◽  
Vol 10 (5) ◽  
pp. 6294-6300
Author(s):  
M. R. H. Khan ◽  
M. A. Hoque
Keyword(s):  
System Analysis ◽  
Phased Array ◽  
Complete System ◽  
Low Noise ◽  
Carrier Generation ◽  
Receiver System ◽  
Free Running ◽  
Averaging Time ◽  
Array Receiver ◽  
Ku Band

In this paper, a complete system analysis of photonic local carrier generation technique has been investigated. The generated carrier is potentially suitable to replace the existing microwave/RF Local Carrier (LC) used in commercial Low Noise Blocks (LNBs) for the Phased Array (PA) receiver system. The optical LC generated from heterodyning of two commercialized lasers is being stabilized with an Optical Frequency Lock Loop (OFLL). This approach resulted in a generated carrier at the Ku-band (10.7GHz to 12.75GHz) signal received from a PA receiver. Various loop parameters of the OFLL have been investigated to comply with the requirements of the commercial LNBs The proposed OFLL shows a 2400 fold improvement in the frequency stability at 1000s averaging time compared to its free running condition. It is also demonstrated that with an optimized loop gain of 30dB, the loop response time of the proposed OFLL becomes 11μs.

scholarly journals Beam Pattern Optimization Method for Subarray-based Hybrid Beamforming Systems

2020 ◽  
Author(s):  
Joerg Eisenbeis ◽  
Jonas Pfaff ◽  
Christian Karg ◽  
Jerzy Kowalewski ◽  
Yueheng Li ◽  
...  
Keyword(s):  
Mimo Systems ◽  
Beam Steering ◽  
Multiple Input Multiple Output ◽  
Optimization Method ◽  
Phase Shifters ◽  
Beam Pattern ◽  
Scattering Parameter ◽  
Receiver System ◽  
Input Multiple Output ◽  
Hybrid Beamforming

Subarray-based hybrid beamforming (SBHB) systems represent an efficient architectural solution to realize massive multiple-input multiple-output (MIMO) systems. Thereby, the beamforming is no longer realized exclusively in the digital domain, but in coordination with an analog beamforming network by connecting each digital channel to a dedicated number of antenna elements via phase shifters. Most channel estimation and beamforming algorithms for SBHB systems are based on beam steering approaches, demanding a precise calibration of the analog beamforming network. In this letter, the SBHB system is calibrated by over-the-air (OTA) scattering parameter measurements and two criteria to optimize the beam pattern are formulated exploiting the ambiguities of the phase shifters. Both optimization criteria are evaluated using a designed SBHB receiver system operating at 27.8 GHz.

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