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Moderate Resolution Imaging Spectroradiometer (MODIS) moderate resolution digital signal receiving method

A technology of digital signal and receiving method, applied in the field of satellite communication, can solve the problem of inability to obtain MODIS data correctly

Inactive Publication Date: 2012-06-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, if the general-purpose digital demodulation chip on the market is directly used for IF reception, the MODIS data cannot be obtained correctly.

Method used

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  • Moderate Resolution Imaging Spectroradiometer (MODIS) moderate resolution digital signal receiving method
  • Moderate Resolution Imaging Spectroradiometer (MODIS) moderate resolution digital signal receiving method
  • Moderate Resolution Imaging Spectroradiometer (MODIS) moderate resolution digital signal receiving method

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Embodiment Construction

[0037] According to the MODIS data modulation method, the main performance indicators of the MODIS demodulator are as follows:

[0038] 1. Input intermediate frequency: frequency: 70MHz; input level: -25dBm~-55dBm.

[0039] 2. Demodulation method: QPSK; demodulation threshold: Eb / No≤5dB.

[0040] 3. Information rate: 13.125Mb / s and 15Mb / s.

[0041] 4. Carrier capture range: better than ±400KHz, carrier capture time: ≤300ms.

[0042] 5. Decoding method: convolution decoding: CONV (7, 1 / 2), CONV (7, 3 / 4) optional, RS decoding: RS (255, 223), interleaving depth I=4.

[0043] 6. Decoding output: decoded data.

[0044] The invention adopts the STV0299B digital demodulation chip of STMicroelectronics, and controls the STV0299B chip through a single-chip microcomputer according to MODIS demodulation and decoding requirements. The STV0299B chip is a multi-standard demodulator with Forward Error Correction (FEC) developed by STMicroelectronics for digital satellite broadcasting. I...

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Abstract

The invention discloses a Moderate Resolution Imaging Spectroradiometer (MODIS) moderate resolution digital signal receiving method, which comprises the steps of treating moderate frequency signals obtained through frequency conversion from a radio frequency end by Quadrature Phase Shift Keying (QPSK) digital demodulation, Viterbi decoding, frame synchronization, de-interleaving and Reed Solomon (RS) decoding; outputting data to a Personal Computer (PC) end; converting format of the data, thereby obtaining MODIS0 level of data product, wherein QPSK digital demodulation and Viterbi decoding are realized by a Digital Video Broadcasting-Satellite (DVB-S) demodulation chip; the MODIS moderation resolution digital signal receiving method is characterized by controlling and expanding the DVD-S demodulation chip by using a single chip and a programmable Field Programmable Gate Array (FPGA) chip, thereby realizing reception of moderate resolution digital signal of MODIS signals.

Description

technical field [0001] The invention relates to a MODIS intermediate frequency digital receiver, which belongs to the technical field of satellite communication. Background technique [0002] MODIS (Moderate Resolution Imaging Spectrometer) is an important sensor mounted on terra and aqua satellites. It is the only satellite on which the real-time observation data is directly broadcast to the world through the X-band, and the data can be received and used for free. Instruments, many countries and regions around the world are receiving and using MODIS data. The MODIS scan period is 1.477 seconds, each scan line has 1354 Pixels along the scan direction, and there are 10 1KMD IFOVs along the satellite orbit direction. During daytime scanning, each point is transmitted in two MODIS packets. The first packet transmits IFOV 1~5, and the second packet transmits IFOV 6~10. It is encapsulated with CCSDS and (255, 223) RS decoding is used for error correction. The length of the enti...

Claims

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Application Information

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IPC IPC(8): H04B1/16H04L27/22
Inventor 韩潇宗鹏孔维萍
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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