Passive multichannel millimeter-wave imaging system

Gorishniak, V.P.; Denisov, Aleksandr; Kuzmin, S.E.; Radzikhovsky, V.N.; Shevchuk, B.M.

doi:10.1109/crmico.2004.183400

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…An analysis of the results of calculations by formula (1) shows that combining, for example, 64 channels per one amplifier-conversion path leads to an increase in inter-channel interference and, as a consequence, to a deterioration in the sensitivity of each channel.…”

Section: Problem Statementmentioning

confidence: 99%

“…Актуальність: Підвищення точності визначення місцезнаходження пасивних радіометричних кореляційноекстремальних систем навігації (РМ КЕСН) літальних апаратів (ЛА) по наземних орієнтирах залежить від здатності інформаційних РМ датчиків систем формувати двовимірні зображення наземних об'єктів в реальному масштабі часу. Застосування матричних РМ датчиків, основою яких є багатоканальні РМ приймачі міліметрового діапазону хвиль (ММД), дозволяє реалізувати необхідну швидкодію КЕСН[1,2]. Мета роботи: Метою роботи є оптимізація кількості каналів, що ущільняються на один підсилювальноперетворювальні тракт багатоканального РМ приймача ММД з лінійним ущільненням і розділенням каналів за формою сигналів.ОПТИМИЗАЦИЯ КОЛИЧЕСТВА КАНАЛОВМНОГОКАНАЛЬНОГО РАДИОМЕТРИЧЕСКОГО ПРИЕМНИКА В.Н.…”

unclassified

See 1 more Smart Citation

Optimization of the number of channels of a multichannel radiometric receiver

Bykov

Miroshnik

2021

Visnyk of V.N. Karazin Kharkiv National University, Series “Radio Physics and Electronics”

View full text Add to dashboard Cite

Background: Improving the positioning accuracy of passive radiometric correlation-extreme navigation systems (RM CENS) of aircraft (AC) by landmarks depends on the ability of information RM sensors of systems to form two-dimensional images of ground objects in real time. The use of matrix RM sensors, which are based on multichannel RM receivers of the millimeter wave range (MMW), makes it possible to realize the required speed of the CENS Objectives: The aim of the work is to optimize the number of multiplexed channels per one amplifying-converting path of a multi-channel RM receiver with linear multiplexing and separation of channels according to the form of signals. Materials and methods: As an optimization criterion in this work, it is proposed to use the gain in sensitivity obtained as a result of the use of a multichannel RM receiver with linear multiplexing and signal waveform separation in comparison with the sensitivity of a RM receiver with time division multiplexing. Results: As a result of the analysis of the process of functioning of a multichannel RM receiver with time division multiplexing in this work a relation was obtained for the sensitivity of an individual channel of a RM receiver with time division multiplexing. Conclusions: It can be concluded that it is optimal to create a matrix RM receiver based on combining 16 RM channels of the superheterodyne type into one amplifier-conversion path. In this case, the total number of amplifying-converting paths is equal to four. The sensitivity of each channel remains high enough.

show abstract

Section: Problem Statementmentioning

confidence: 99%

unclassified

Optimization of the number of channels of a multichannel radiometric receiver

Bykov

Miroshnik

2021

Visnyk of V.N. Karazin Kharkiv National University, Series “Radio Physics and Electronics”

View full text Add to dashboard Cite

show abstract

“…Analysis of the results of experimental studies [3,4] aimed at the formation of RMI by scanning and matrix RM system MMB, allows us to conclude that the «half» overlap of the beam pattern of individual channels leads to an increase in the signal-to-noise ratio in the generated image due to additional accumulation of the signal in the RMI elements. In this case, the configuration of the image of the object, in contrast to the case without overlapping the beam pattern, is not violated [5].…”

Section: Problem Statementmentioning

confidence: 99%

Evaluation of accuracy of radiometric correlation-extreme navigation systems

Bykov

Miroshnik

2021

Visnyk of V.N. Karazin Kharkiv National University, Series “Radio Physics and Electronics”

View full text Add to dashboard Cite

Background: The use of passive matrix radiometric sensors of the millimeter wave range in aircraft navigation systems, which make it possible to form a radiometric image of a ground navigation object under conditions of high-speed flight of aircraft, is one of the effective ways to ensure high accuracy in measuring the coordinates of objects and, ultimately, leads to an increase in the probability of positioning aircraft [1]. In work [2], analytical relationships were obtained and quantitative estimates of the accuracy of positioning of aircraft equipped with a matrix radiometric navigation system were made. It is shown that the use of matrix radiometric sensors makes it possible to realize the required high (up to units - tens of meters) positioning accuracy of high-speed aircraft. Objectives: The purpose of this article is to develop a method for increasing the accuracy of a radiometric correlation - extreme system based on the use of a matrix radiometric millimeter-wave receiver with channel compaction. Materials and methods: In this paper, we used the method of linear multiplexing with channel separation according to the waveform using orthogonal Walsh functions. In this case, the sensitivity for each channel corresponds to the sensitivity of the modulation radiometer, and in comparison with the sensitivity of the compensation radiometer, it decreases by about two times. Taking into account the orthonormality of the Walsh functions, the signal at the output of each channel is proportional to the intensity (power) of the signal at the input of this channel. Results: In this work, it is shown that the optimal number of combined channels is a multiple . The analysis of the results of the calculations shows that the combination of 64 channels into one amplifier-conversion path leads to an increase in inter-channel interference and, as a consequence, to a deterioration in the sensitivity of each channel. Conclusions: In this case, it is expedient to limit the number of channels to be sealed per one amplifying-converting path. So, when 16 channels are combined into one path, the sensitivity of each channel remains quite high: about 1 K – for a super heterodyne radiometric receiver, and less than 1 K – for a direct amplification radiometric receiver. In this case, the number of amplifying-conversion paths with the total number of channels in the matrix 64 is equal to four.

show abstract

The analysis and simulation of ellipsoid antenna for millimeter-wave imaging

Wang

Wenjing

2007

2007 6th International Conference on Antenna Theory and Techniques

View full text Add to dashboard Cite

Passive multichannel millimeter-wave imaging system

Cited by 3 publications

References 0 publications

Optimization of the number of channels of a multichannel radiometric receiver

Optimization of the number of channels of a multichannel radiometric receiver

Evaluation of accuracy of radiometric correlation-extreme navigation systems

The analysis and simulation of ellipsoid antenna for millimeter-wave imaging

Contact Info

Product

Resources

About