Скачать 2.12 Mb.
This section describes the real-time systems which are available for NOAA KLM direct readout users. These systems include the High Resolution Picture Transmission (HRPT), the Automatic Picture Transmission (APT), Direct Sounder Broadcast (DSB) and the Data Collection System (DCS). Transmission characteristics, data frame formats and synchronization details are given for each of the above mentioned systems.
4.1 HRPT SYSTEM
The High Resolution Picture Transmission (HRPT) system provides data from all spacecraft instruments at a rate of 665,400 bps. The S-band realtime transmission consists of the digitized unprocessed output of five AVHRR/3 channels, plus the TIP (HIRS/3, SBUV/2, SEM, and DCS/2) data and AMSU data. All information necessary to calibrate the instrument outputs is included in the data stream.
During NOAA-K activation and evaluation, it was determined that AMSU-A channels 7 and 15 were switched. This switch should be transparent to Level 1b users as the channels were corrected (switched back) by the ingest software, however, direct readout users should be aware of this problem. Only the radiometric data was affected, the housekeeping temperatures of channels 15 and 7 oscillators are correct as they are now. The antenna patterns, beam efficiency and beam widths are correct as they were not affected by the switch. Band pass for channels 7 and 15 was not affected due to extremely broad rf-detectors.
4.1.2 TRANSMISSION CHARACTERISTICS
The S-band transmission of time multiplexed, digital data is in a split phase format. For NOAA KLM, split phase data "0" is defined as being +68 degrees phase during the first half of the bit period and -68 degrees during the second half of the bit period. The split phase data "1" is defined as being -68 degrees phase during the first half of the bit period and +68 degrees phase during the second half of the bit period, for NOAA KLM. Note, the NOAA-N,-N satellites have a slightly different phase angle (see Table 4.1.2-2). Table 4.1.2-1 shows the general characteristics of the HRPT transmission system, while the general HRPT parameters for both NOAA KLM and NOAA-N,-N are shown in Table 4.1.2-2.
|Architecture-Driven Modeling of Real-Time Concurrent Systems||Ucr cs122B (Adv. Embedded/Real-Time Systems) Midterm – Winter 2003 – Prof. Frank Vahid|
|Ucr cs122B (Adv. Embedded/Real-Time Systems) Midterm – Winter 2003 – Prof. Frank Vahid||Predicting high-cost users of medical care and the persistence of high expenditures over time|
|Assaying Means Of Design Expression for Users & Systems||Approved Real time pcr and nanoparticle diagnostic facilities for high throughput quantitative analysis of|
|Integrated Systems Based Approaches to Realising Energy Efficiency Opportunities for Industrial/ Commercial Users – by Sector||Integrated Systems Based Approaches to Realising Energy Efficiency Opportunities for Industrial/ Commercial Users – by Sector|
|PReface This documentation describes a course proposal for a three-year full-time ab initio route leading to the award of Bachelor of Engineering in Mechanical Engineering. Section 1||The move to "open systems" requires re-thinking interaction with knowledge representation systems|