This section describes the real-time systems which are available for noaa klm direct readout users. These systems include the High Resolution Picture




НазваниеThis section describes the real-time systems which are available for noaa klm direct readout users. These systems include the High Resolution Picture
страница1/29
Дата03.10.2012
Размер2.12 Mb.
ТипДокументы
  1   2   3   4   5   6   7   8   9   ...   29
4.0 REAL TIME DATA SYSTEMS FOR LOCAL USERS


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


4.1.1 GENERAL


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.


Table 4.1.2-1. HRPT Transmission Characteristics.

Line Rate

360 lines/minute

Data Channels

5 transmitted, 6 available

Data Resolution

1.1 km

Carrier Modulation

Digital split phase, phase modulated

Transmitter Frequency (MHz)

1698.0 or 1707.0 MHz primary, 1702.5 MHz secondary For the latest information on individual POES spacecraft , refer to NOAA/NESDIS/OSO’s website:

http://www.oso.noaa.gov/poesstatus/index.asp

Transmitter Power (EOL)

6.35 W (38.03 dBm)

Radiated Power (dBm, @ 63 degrees)

40.13

Polarization:

STX1

STX2

STX3


RCP

LCP*

RCP

* Except when STX2 is connected to the emergency omni antenna which is also RCP.




Table 4.1.2-2. HRPT Parameters for NOAA KLM and NOAA-N,-N’.

Parameter

NOAA KLM

NOAA-N,-N

Major Frame

Rate

2 major frames/sec

2 major frames/sec

Minor Frames/Major Frame

3

3

Minor Frame

Rate

6 minor frames/sec

6 minor frames/sec

Number of words

11,090

11,090

Format

See Table 4.1.3.1-1

See Table 4.1.3.2-1

Word Parameters

Rate

66,540 words/sec

66,540 words/sec

Number of bits/word

10

10

Order

Bit 1=MSB, Bit 10=LSB

Bit 1=MSB, Bit 10=LSB

Bit Parameters

Rate

665,400 bits/sec

665,400 bits/sec

Format

Split phase

Split phase

Data "0"

+68/-68 degrees

+67/-67 degrees

Data "1"

-68/+68 degrees

-67/+67 degrees
  1   2   3   4   5   6   7   8   9   ...   29

Похожие:

This section describes the real-time systems which are available for noaa klm direct readout users. These systems include the High Resolution Picture iconArchitecture-Driven Modeling of Real-Time Concurrent Systems

This section describes the real-time systems which are available for noaa klm direct readout users. These systems include the High Resolution Picture iconUcr cs122B (Adv. Embedded/Real-Time Systems) Midterm – Winter 2003 – Prof. Frank Vahid

This section describes the real-time systems which are available for noaa klm direct readout users. These systems include the High Resolution Picture iconUcr cs122B (Adv. Embedded/Real-Time Systems) Midterm – Winter 2003 – Prof. Frank Vahid

This section describes the real-time systems which are available for noaa klm direct readout users. These systems include the High Resolution Picture iconPredicting high-cost users of medical care and the persistence of high expenditures over time

This section describes the real-time systems which are available for noaa klm direct readout users. These systems include the High Resolution Picture iconAssaying Means Of Design Expression for Users & Systems

This section describes the real-time systems which are available for noaa klm direct readout users. These systems include the High Resolution Picture iconApproved Real time pcr and nanoparticle diagnostic facilities for high throughput quantitative analysis of

This section describes the real-time systems which are available for noaa klm direct readout users. These systems include the High Resolution Picture iconIntegrated Systems Based Approaches to Realising Energy Efficiency Opportunities for Industrial/ Commercial Users – by Sector

This section describes the real-time systems which are available for noaa klm direct readout users. These systems include the High Resolution Picture iconIntegrated Systems Based Approaches to Realising Energy Efficiency Opportunities for Industrial/ Commercial Users – by Sector

This section describes the real-time systems which are available for noaa klm direct readout users. These systems include the High Resolution Picture iconPReface 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

This section describes the real-time systems which are available for noaa klm direct readout users. These systems include the High Resolution Picture iconThe move to "open systems" requires re-thinking interaction with knowledge representation systems

Разместите кнопку на своём сайте:
Библиотека


База данных защищена авторским правом ©lib.znate.ru 2014
обратиться к администрации
Библиотека
Главная страница