CTU controls brand new powering up, timing series, observing process, and you may setup of SAR payload
SAR Electronic devices Subsystem
In the form of the brand new correspondence coach, the new Manage and you will Time Device (CTU) receives sales on satellite platform and you will sends county monitoring research so you’re able to they. For the time being, the new AIU checks this new functioning county of your electronics subsystem and you may the fresh performing state of your own antenna subsystem as a result of a specialist investigation coach.
The advantage Provider Tool (PDU) distributes the working platform stamina shuttle to any or all equipment of your SAR electronic devices subsystem, as well as AIU and you will TGCUs of one’s antenna subsystem, and you will energies right up these units under the command over the new CTU and satellite platform. Because of the some requires of your own secondary power, the new DC-DC converters is strewn on the most other units in the place of becoming build on PDU.
According to a high stability oscillator, a frequency Promoting Tool (FGU) generates the fresh parallel site frequency indicators needed because of the other equipment. With regards to the heartbeat width, data transfer, modulation mountain, and you can time control gotten on the CTU, the latest Linear frequency modulated code Generating Tool (LGU) utilizes during the-orbit real-big date data to produce new chirp signal waveforms and you may sends they with the TGCU and you may Inner Calibration Equipment (ICU) immediately following modulation, up-conversion process, selection, and amplifying. Due to the numerous bandwidth means, eight-bandwidth selection is supported by new filter financial inside LGU.
Regarding the UF mode, HAB and you may HCD is Usbekistani damedatingsider actually picked due to the fact one or two yields indicators regarding the CSU whenever observing for the H single polarization, including VAB and you can VCD within the V polarization. Various other settings, HAB and you can HCD is combined into you to production regarding CSU, also VAB and you may VCD is combined is another you to definitely.
Which includes a few parallel person avenues, the new Dual-channel Individual Device (DRU) down-turns both RF signals with the Advanced Frequency (IF) which have chosen obtain that is controlled by the data Buy and Creating Tool (DAFU). The acquire of one’s DRU can be by hand regulated, and therefore the get form responds into the crushed order, or is going to be instantly controlled, and therefore the fresh new settings is adjusted automatically with regards to the in the-orbit computation results of the newest DAFU. An equivalent If filter out banking companies since the utilized in LGU are used from inside the DRU to deal with more data transfer signals.
The latest In the event the indicators try brought for the analog-to-digital sales directly in the brand new DAFU which have a sample regularity off MHz. Signal demodulation and selection is observed about electronic website name. Down testing was applied to decrease the fresh new SAR raw investigation price in the eventuality of lowest signal data transfer. Both studies channels was compacted having fun with step three-piece otherwise 4-section Cut-off Transformative Quantization (BAQ) formulas otherwise a top 4-part interception algorithm. Your selection of compression formulas together with acquisition initiate some time cycle try subject to this new CTU, and therefore interprets the fresh observation requests received in the satellite program. The brand new compacted study and you will auxiliary investigation is formatted depending on the observing means and compressing approach to setting the fresh SAR brutal study package. Throughout the interior calibration modes, the additional data in addition to uncompressed analysis, that contain the replica of your own transmitted waveform, was formatted in order to create new SAR intense data plan.
New four RF indicators (HAB, HCD, VAB, and VCD) gotten throughout the antenna program was picked otherwise joint regarding the Channel Option Tool (CSU) according to observing modes
Internal calibration is accomplished regarding SAR payload by creating transmit-found closed RF loops which can be attained by the inner Calibration Unit (ICU) as well as the calibration community. The fresh new ICU have RF changes, delayed and you will low-put-off RF routes, and you may interfaces toward LGU, antenna, and the TGCU. RF loops was molded and you will turned from the managing the condition of the latest RF switches from the ICU.