7) Russia’s much touted ROFAR is a counter to stealth.
This is theoretically true – but the extent remains to be seen. Use the calculator again but with frequency set at 110GHz. The skin depth for gold is now only 227 nanometers. This means that all of your layers are now thicker relative to skin depth – which means that they are more reflective. Everything. Your RAM paint, canopy coat, all of it. Possibly too reflective. (And this shows that more RAM is not better. If the technicians apply the coats too thick it actually degrades stealth.
Now go back to airpoweraustralia’s stealth analyses and you will see a large reason why they were so wrong
)
According to the Chinese they say the noise level drops 100 times lower and looking at the latest RTI source that I have provided earlier the head chief says the size reduction of obtaining FICs would be 12 times smaller. So I wonder if the 100 times lower noise is just ROFAR or having the same amount FICs as an aircraft has MMICs if that is so than I wonder if they can put 12 times as much FICS into their aircraft to lower the noise even further
8) ROFAR could let one see a pilot’s face.
False. It would be the lower frequencies which would penetrate through the canopy. They don’t have the resolution to produce more than a blur. The Russians do have a habit of exaggeration.
I found sources that have said 1hz and 1ghz and KRET’s head official saying UHF frequencies. There are radars that use lower frequencies this has been shown even by Chinese research papers that ultra-high resolution is achievable at long ranges.
https://spie.org/news/zhang-photonic…solution?SSO=1
More experiments done by them.
They confirm ultra-high SAR is achievable at long ranges but I am sure everyone is curious to see RTI’s radar prototype for their aircraft designs. Went through one of their articles they have tested radar balloon prototypes to track low altitude targets faraway and seem to also be working on expanding the frequency to the terahertz range. They use Photodetectors multiply frequency and modulators to de-chirp their frequency. This is their summary, ”
In summary, we have designed a novel photonics-based radar applying photonic generation and de-chirp processing of broadband radar signals. The radar has great potential in real-time target detection and imaging with an ultra-high resolution.”
As you said lower frequencies are needed to penetrate the canopy but in their summary they can multiply broadband radar signals and than de-chirp them without having to worry about a signal to noise loss doing it.
More of their experiments
https://www.osapublishing.org/Direct…eq=0&mobile=no
the words are all screwed up for me to post their quote in that source. but on number 4 discussion and conclusion they have tested a 4ghz bandwidth on a regular radar and have demonstrated a ka-band radar with a bandwidth of 12ghz having better range resolution than just the phased array radar.
more of their high frequency radar tests using lower bandwidths achieving high resolution
W-band inverse synthetic aperture radar (ISAR) imaging systems are very useful for automatic target recognition and classification due to their high spatial resolution, high penetration and small antenna size. Broadband linear frequency modulated wave (LFMW) is usually applied to this system for its de-chirping characteristic. However, nearly all of the LFMW generated in electronic W-band ISAR system are based on multipliers and mixers, suffering seriously from electromagnetic interference (EMI) and timing jitter. And photonic assisted LFMW generator reported before is always limited by bandwidth or time aperture. In this paper, for the first time, we propose and experimentally demonstrate a high-resolution W-band ISAR imaging system utilizing a novel logic-operation-based photonic digital-to analog converter (LOPDAC). The equivalent sampling rate of the LOPDAC is twice as large as the rate of the digital driving signal. Thus, a broadband LFMW with a large time aperture can be generated by the LOPDAC. This LFMW is up-converted to W band with an optical frequency comb. After photonic-assisted de-chirping processing and data processing to the echo, a high-resolution two-dimension image can be obtained. Experimentally, W-band radar with a time-bandwidth product (TBWP) as large as 79200 (bandwidth 8 GHz; temporal duration 9.9 us) is established and investigated. Results show that the two-dimension (range and cross-range) imaging resolution is ~1.9 cm × ~1.6 cm with a sampling rate of 100 MSa/s in the receiver.
US
https://www.sciencedirect.com/topics/engineering/x-band
The feasibility of a photonics beamformer at L- and X-bands has been demonstrated [65]. The use of one beamformer capable of operating at widely separated bands of frequency is a major achievement.
Photonics-based beamformers can have an instantaneous bandwidth extending from 3 to 6 GHz and are 75% lighter and smaller than their electronics counterparts, and the incurred loss of about 14 dB is tolerable [66]. The weight and volume advantages of photonics-based beamformers make them attractive for airborne/satellite-borne applications.
A 5-bit photonic switchable delay line for a wideband array has been reported for an airborne application [67]. The array occupies an area of 0.9 × 2.8 m2 and consists of 96 elements. It is designated to operate in the 850–1400 MHz range and follows the contour of a jumbo jet fuselage. The 96 radiating elements were divided into 24 columns with three combined into one subarray which was controlled by a 5-bit time shifter. The photonic time shifter provides the coarse delay steps ranging from 0.25 to 7.75 ns while a 6-bit electronic delay line in the T/R modules provides refined differential delays ranging from 0.01 to 0.5 ns. The array has a 50% instantaneous bandwidth and the L-band module has a 38 dB loss, but efforts are being made to reduce this.”
This was back in 2000, and if the Chinese and Russians see feasibility in photonics I am sure the US has made the efforts to already reduce the noise loss. if you read further in this source even the US also referenced them as FICs photonic integrated circuits and speak of the same benefits of it as well.
https://uanews.arizona.edu/press-release/ua-selected-photonics-project
Frank Jaworski, program manager for emerging technology at Raytheon Vision Systems, added: “Raytheon regards the integration of photonic integrated circuits with focal plane arrays as a critical path for the development of future Department of Defense imaging systems vital to the nation’s security. We look forward to the University of Arizona’s leadership of the consortium and utilizing their expertise in developing this key technology.”
Neil Supola, chief of the infrared focal plane array branch at the Army’s Night Vision and Electronic Sensors Directorate and government program manager for AIM Photonics, said: “This program is a great opportunity for the Department of Defense to leverage advances in integrated photonics manufacturing being realized by the Manufacturing USA program together with its state, industrial and academic partners. The scope of industrial participation on this project highlights the relevance photonic integration has within the Department of Defense community, and this project’s inherent potential to make a large impact.”
https://tass.ru/armiya-i-opk/6598983
Specialists of RTI have tested a prototype model of a radiophotonic radar of a new generation. The general director of the RTI group, Maxim Kuzyuk, said this in an interview with TASS on Thursday in the framework of the Army-2019 forum.
“The prototype model and software work, there is a specific result. We conducted experiments, and the radar is already building the trajectory of the aircraft,” he said.
According to the CEO, now the specialists are faced with the task of creating an imitation-modeling stand and improving the hardware and software of the locator, including the creation of integrated photon circuits.
Radio photon locators have significant advantages in noise immunity and resistance to electromagnetic radiation. “The obvious advantages of photon radar stations are a significant increase in accuracy, reliability, a decrease by several times in energy consumption and a decrease in the size and weight of the antenna by dozens of times,” said Kuzyuk.
The use of radiophotonic technologies will allow to achieve breakthrough results in the development of radar systems. Radiophotonic radar will have increased range and accuracy of tracking, as well as significantly smaller dimensions compared to the “traditional” stations. Moreover, due to the use of photon technologies on the radar screen, the targets will not be displayed in the form of points, but images. That is, the operator will see the real goal – an airplane, a rocket, a drone or a meteorite.
Earlier, the press service of the RTI group announced the launch of the production of vertically emitting lasers in 2018, one of the main components of the radiophotonic radar.
hmmm no points on radar screen but images. I guess we can all say goodbye to this in the future.
So basically any pilot operating this will only see pictures and nothing else? A mock-up being presented at the maks 2019 airshow would sure be nice if thats possible.
Got this information from here http://www.russiadefence.net/t2547p450-russian-radar-systems and if anyone knows about this radar or the name of it please let me know.
Band: S
Dimentions: 8x8m
Instrumental range: 6000km
Scan sector: +/- 20 degrees
Impulse power: 500kWt
Range vs 5m2: 3000km
Resolution: 0,6-30m in range, 45min angle
Errors: 3m range, 0,5min angle
Power consumption: 2MWt
Also if possible can any Russian speaker translate this whole thing(not just the specs)? Other information that I am assuming is that it has 196 t/r modules by counting them in that picture and assuming the dimensions are referring about the antenna size which is 8 by 8 meters the size would be 64 meters divided by 196 would mean each module would be 0.326 by .0326 meters so I am assuming each module size is 1ft by 1ft and dividing 2 megawatts by 196 each t/r module consumes 10.2 kilowatts although its the power consumption I am wondering if it is referring to max power consumption or not. This radar was presented in the 2019 forum.
Got the info from
magnumcromagnon
http://www.russiadefence.net/t2547p4…-radar-systems
In case the majority of people did not get any news update more info regarding ROFAR.
The age of the RTI’s CEO shocks me.
https://tass.com/defense/1065451 korsar drone going from a 50 to 70hp engine.
https://www.youtube.com/watch?v=idprk-J_YiQ Can anyone translate the description of the owl drone? I believe the image of it is implying it is being used to fool satellites getting information thinking its just a bird instead of a drone while getting info on ground targets.
https://bmpd.livejournal.com/3686030.html lancet drone has increased payload.
Sign In
