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GNSS-R (Global Navigation Satellite System Reflection) correlator device and GNSS-R comprehensive detection device based on distributed computation

A distributed computing and correlator technology, applied in the field of correlators, can solve the problems of poor correlator function scalability and single correlator working mode, and achieve the effect of reducing the number of data output interfaces, saving hardware resources, and saving resources

Active Publication Date: 2019-06-14
SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention proposes a GNSS-R correlator device and a GNSS-R comprehensive detection device based on distributed computing. The structural design method of cascading installation solves the problem of poor functional scalability of traditional correlators; by adopting the design method of direct connection between remote control and telemetry and correlator boards, the working mode of correlators can be flexibly switched to solve the problem of traditional correlators. single-mode problem

Method used

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  • GNSS-R (Global Navigation Satellite System Reflection) correlator device and GNSS-R comprehensive detection device based on distributed computation
  • GNSS-R (Global Navigation Satellite System Reflection) correlator device and GNSS-R comprehensive detection device based on distributed computation

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Embodiment 1

[0028] Please refer to figure 1 , a GNSS-R correlator device based on distributed computing, comprising: a multi-channel array signal processing module 1, a correlator module 2, a correlator remote control telemetry module 3, a solid storage module 4 and a secondary power supply 5, wherein,

[0029] The multi-channel array signal processing module 1 is electrically connected to the antenna system of the previous stage, and is connected with the correlator module 2 through an optical fiber interface for data transmission, and is also connected with the solid storage module 4 through an LVDS interface for data transmission; the correlator module 2 and the solid-state The storage module 4 is connected to and transmits data through the RS422 interface, and simultaneously communicates with the satellite platform and / or the data transmission system through the RS422 interface and performs data transmission; the correlator remote control telemetry module 3 is connected with the multi-...

Embodiment 2

[0063] Based on Embodiment 1, this embodiment further provides the structure of the correlator module, please refer to figure 2 ,

[0064] The correlator module adopts the hardware architecture of 4AD+2FPGA+1DSP, adopts the principle of distributed computing, and calculates the interferometric GNSS-R cross-correlation power spectrum of navigation satellite signals by controlling the computing unit FPGA2 through the correlator main control unit FPGA1. At the same time, the correlator module also reserves the communication interface of the expansion calculation unit, which can effectively expand the number of beams and the number of cross-correlation channels of the payload.

[0065] Among them, 4AD adopts AD9288 analog-to-digital converter (analog to digital converter, ADC), and DSP adopts DSP6678 digital signal processing (Digital Signal Processing, DSP).

Embodiment 3

[0067] Based on the above embodiments, this embodiment also provides a distributed computing-based GNSS-R comprehensive detection device, including the distributed computing-based GNSS-R correlator device of the above embodiments.

[0068] The new GNSS-R correlator device based on distributed computing of the above invention embodiments can simultaneously calculate the GNSS direct-reflection cross-correlation power spectrum of multiple beams, covering multiple specular reflection areas. Compared with the traditional narrow-swath spaceborne The radar altimeter doubles the detection width of the GNSS-R detection device, and improves the detection accuracy of the surface parameters of the ground and the sea at a certain time-space resolution.

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Abstract

The invention discloses a GNSS-R (Global Navigation Satellite System Reflection) correlator device and a GNSS-R comprehensive detection device based on distributed computation. A multi-channel array signal processing module of the GNSS-R correlator device is used for receiving a navigation satellite signal and outputting a digital beam forming signal and original data of the navigation satellite signal; a correlator module comprises a main control unit and a calculation unit and completes beam angle calculation of the navigation satellite signal, theoretical mirror reflection point calculation, reflection channel PRN selection, reflection signal control quantity calculation, acquisition of a GNSS direct digital intermediate frequency signal and a GNSS reflected digital intermediate frequency signal and selection of a data downloading type; a correlator remote control telemetering module is used for acquiring telemetering information and sending a remote control instruction; and a solidstorage module is used for storing and transmitting back the original data of the navigation satellite signal. The GNSS-R correlator device adopts the main control unit to control a control mode of the calculation unit so as to facilitate expanding the calculation unit and save hardware resources to the greatest degree; and meanwhile, a problem that acquired GNSS-R orignal data cannot be downloaded is also effectively solved.

Description

technical field [0001] The present application relates to the field of correlators, in particular to a distributed computing-based GNSS-R correlator device and a GNSS-R comprehensive detection device. Background technique [0002] The GNSS-R comprehensive detection device adopts GNSS-R (Global Navigation Satellite System-Reflection) bistatic radar scattering marine remote sensing technology, which is a new, effective and low-cost microwave remote sensing technology. , The multi-working mode design of the load realizes the integration and light weight of the correlator, and can flexibly expand the correlator module board and the number of digital channels according to the application detection requirements of the load, correspondingly expanding the entire GNSS-R load The detection swath can be applied to the detection of battlefield environment elements such as mesoscale average sea surface height, sea surface wind field, significant wave height, and sea ice. [0003] At pre...

Claims

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Application Information

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IPC IPC(8): G01S19/14G01S19/33G01S13/88G01S13/95
CPCY02A90/10
Inventor 秦瑾周勃冯剑锋杜璞玉李洪星
Owner SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM