CN212569183U

CN212569183U - Portable meteorological satellite LRIT data receiving and processing system

Info

Publication number: CN212569183U
Application number: CN202021538074.8U
Authority: CN
Inventors: 贾树波; 沙金; 彭朝巍
Original assignee: Beijing Huayun Xingditong Technology Co ltd
Current assignee: Beijing Huayun Xingditong Technology Co ltd
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2021-02-19
Anticipated expiration: 2030-07-29

Abstract

The utility model relates to a portable meteorological satellite LRIT data reception processing system, include: the portable box is internally provided with a micro antenna, an integrated receiver and a terminal; the micro antenna receives meteorological data, and the integrated receiver is connected with an output port of the micro antenna and processes the meteorological data; and the terminal connected with the integrated receiver receives and stores the processed meteorological data. The meteorological data receiving system shown in the embodiment is small in size, high in flexibility and high in stability.

Description

Portable meteorological satellite LRIT data receiving and processing system

Technical Field

The utility model relates to a meteorological technical field, more specifically say, relate to a portable meteorological satellite LRIT data reception processing system.

Background

The wind cloud number four A star is the first star of the second generation static meteorological satellite in China, and compared with the wind cloud number two series satellites, the satellite-borne instruments of the wind cloud number four A star have great changes in performance and quantity. Real-time data received by the Fengyun No. four star A ground system, and all levels of data and products obtained by processing and processing of the business system play an important role in the application fields of weather forecast, ecological environment monitoring and the like, and have strong application requirements in multiple fields of national economy (agriculture, forestry, water conservancy, environment, traffic and the like).

In order to strengthen the application of the wind cloud fourth satellite data in partial industries, the China weather service uses the wind cloud fourth LRIT satellite broadcasting link to issue the lightning locator data and the imager fast view data in real time. For industrial applications of a part of users.

In order to complete the receiving and application of the wind cloud number four LRIT data, a set of system is specially erected for receiving and processing the wind cloud number four LRIT data. The original system is based on a foundation platform, and data receiving is carried out by using the movable 0.8-meter parabolic antenna, so that the whole system is huge in structure and is not very beneficial to carrying of the system.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a portable meteorological satellite LRIT data reception processing system, the structure is little, portable.

In order to achieve the above object, the present invention provides a technical solution as follows.

A portable meteorological satellite LRIT data receiving and processing system comprises: the portable box is internally provided with a micro antenna, an integrated receiver and a terminal; the micro antenna receives meteorological data; the integrated receiver is connected with an output port of the miniature antenna and is used for processing the LRIT data of the meteorological satellite; and the terminal connected with the integrated receiver receives and stores the processed meteorological data.

Preferably, the micro antenna is an n × n unit microstrip array panel antenna, and n is a positive integer.

Preferably, each unit is a left-hand circularly polarized microstrip array and a right-hand circularly polarized microstrip array, and each two sub-antennas are connected through a power divider and are combined into one unit.

Preferably, the integrated receiver comprises a radio frequency input port, an LNB module, a gain control module, a baseband filtering and gain control module, a demodulation and decoding module, a master control module and a network interface, the radio frequency input port is connected with the LNB module, the LNB module is connected with the gain control module, the baseband filtering and gain control module is connected with the demodulation and decoding module, the master control module is connected with the network interface, satellite signals are input through the radio frequency input port, are subjected to signal amplification and filtering processing by the LNB module, are adjusted by the gain control module according to the amplification factor of the satellite signals, are subjected to integral filtering processing by the baseband filtering and gain control module, demodulate and decode the satellite signals to acquire satellite data, and the master control module performs data processing on the satellite data, and transmitting the processed satellite data to the terminal by a network interface.

Preferably, the integral receiver is fixed to the back of the micro antenna.

Preferably, the integrated receiver further includes a power module, and the LNB module, the gain control module, the baseband filtering and gain control module, the demodulation decoding module, and the main control module are respectively connected to the power module.

Preferably, the terminal is a notebook computer, a desktop computer or a server.

The utility model discloses the portable meteorological satellite LRIT data reception processing system that each embodiment provided adopts miniature antenna to receive meteorological data to unite two into one high frequency extension and receiver, form the integral type receiver, reduced original receiving system's volume greatly, this portable meteorological satellite LRIT data reception processing system can set up in the luggage box, can hand-carry, conveniently is applied to in application fields such as weather forecast, ecological environment monitoring.

Drawings

Fig. 1 is a schematic block diagram of a portable meteorological satellite LRIT data receiving and processing system according to a first embodiment of the present invention;

fig. 2 is a schematic view of a micro antenna according to a second embodiment of the present invention;

fig. 3 is a schematic diagram illustrating a micro antenna according to a third embodiment of the present invention;

fig. 4 is a schematic diagram of an integrated receiver according to a fourth embodiment of the present invention.

Detailed Description

In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the embodiments of the invention may be practiced without these specific details. In the present invention, specific numerical references such as "first element", "second device", and the like may be made. However, specific numerical references should not be construed as necessarily subject to their literal order, but rather construed as "first element" as opposed to "second element".

The specific details presented are exemplary only, and may be varied while remaining within the spirit and scope of the invention. The term "coupled" is defined to mean either directly connected to a component or indirectly connected to the component via another component.

Preferred embodiments suitable for implementing the methods, systems and devices of the present invention are described below with reference to the accompanying drawings. Although the embodiments are described with respect to a single combination of elements, it is to be understood that the invention includes all possible combinations of the disclosed elements. Thus, if one embodiment includes elements A, B and C, while a second embodiment includes elements B and D, the invention should also be considered to include other remaining combinations of A, B, C or D, even if not explicitly disclosed.

As shown in fig. 1, a first embodiment of the present invention provides a portable meteorological satellite LRIT data receiving and processing system, including: a portable case 100, in which a micro antenna 101, an integrated receiver 102, and a terminal 103 are provided inside the portable case 100; the micro antenna 101 receives meteorological data; the integrated receiver 102 is connected with an output port of the miniature antenna 101 and is used for processing LRIT data of the meteorological satellite; and the terminal 103 connected with the integrated receiver 102 receives and stores the processed meteorological data.

In a preferred embodiment, the micro antenna 101 may be an n × n element microstrip array patch antenna, where n is a positive integer.

For the antenna part, the parabolic antenna is inconvenient to carry, large in size and complex to assemble. Thus, this system no longer employs a 0.8 meter parabolic antenna.

Through calculation of a satellite downlink and theoretical simulation of an antenna, a four-unit micro-miniature microstrip antenna is uniquely designed according to the existing functional requirements. As shown in fig. 2, the size of the whole antenna is 46 × 40cm, which is reduced by half compared with the original antenna. The antenna is in the form of a 4 x 4 element microstrip array panel antenna.

Preferably, each unit is a left-hand circularly polarized microstrip array and a right-hand circularly polarized microstrip array, and each two sub-antennas are connected through a power divider and are combined into one unit. As shown in fig. 3, each unit is a left-handed and right-handed circularly polarized microstrip antenna, and is further divided into four synthesis units A, B, C and D as shown by the dotted lines in the figure, each synthesis unit is a 2 × 2 unit left-handed and right-handed circularly polarized microstrip array, and the synthesis principle of the synthesis units is shown in the following figure (taking the left-handed circular polarization of the synthesis unit a as an example). By the mode, the packaging size of the antenna is reduced as much as possible on the basis of meeting the system gain requirement.

Referring to fig. 4, preferably, the all-in-one receiver 102 includes a radio frequency input port 401, an LNB module 402, a gain control module 403, a baseband filtering and gain control module 404, a demodulation and decoding module 405, a main control module 406, and a network interface 407, where the radio frequency input port 401 is connected to the LNB module 402, the LNB module 402 is connected to the gain control module 403, the baseband filtering and gain control module 404 is connected to the demodulation and decoding module 405, the main control module 406 is connected to the network interface 407, a satellite signal is input from the radio frequency input port 401, is amplified and filtered by the LNB module 402, an amplification factor of the satellite signal is adjusted by the gain control module 403, an overall filtering process is performed on the amplified satellite signal by the baseband filtering and gain control module 404, and the demodulation and decoding module 405 demodulates the satellite signal, and satellite data is acquired, the main control module 406 performs data processing on the satellite data, and a network interface transmits the processed satellite data to the terminal.

Preferably, the integrated receiver further includes a power module 408, and the LNB module, the gain control module, the baseband filtering and gain control module, the demodulation decoding module, and the main control module are respectively connected to the power module 408.

The LNB module is an amplifying part in the whole all-in-one machine and mainly has the functions of filtering and amplifying input analog satellite signals. In practical application, many sites will be interfered by mobile phone signals, so in order to effectively suppress mobile phone signals, in the LNB, two signal filtering and large dynamic technologies are adopted to effectively suppress mobile phone signal interference:

1) signal filtering

This requires a high squareness for the filter and a bandwidth of no less than 30 MHz. The filter passband difference loss is generally no less than 0.6dB, and it is known that for weak satellite signal receivers, where a large output signal-to-noise ratio (S/N) is required, the receiver system internal noise must be as small as possible. A multi-cascade high-gain receiving system, the noise of the whole system is mainly determined by the noise and the gain of a first-stage amplifier, a filter can not be designed at least at the first stage of an LNA (low-noise amplifier) in consideration of the design principle of filtering and system noise, and the problem of saturation blocking of the front stage of the LNA (low-noise amplifier) needs to be solved and is generally designed at the second stage or the rear stage.

2) Large dynamic technique

In design, the low noise technique and the large dynamics technique are contradictory. The low noise technology requires that the active device itself generates low noise and has high receiving sensitivity, and under the condition of meeting the requirement, a microwave element with low current and low noise is adopted, but the dynamic state of the microwave element is reduced by nearly 20 dB. Large dynamic technologies will employ large current, high noise microwave devices. The technical requirements of large dynamic are met, and the requirements of low noise and high receiving sensitivity of the system cannot be met. Therefore, the contradiction between the receiving sensitivity of the good LNA and the large dynamic receiving performance of the LNA is solved, and the key technology of the corresponding LNA is successfully developed.

By adopting a new technology, the L-band large-dynamic low-noise amplifier is automatically developed, the linear power is greater than 25dBm, the noise coefficient is 0.7dB, the third-order intermodulation is better than 50dBc, and in actual use, the low-noise amplifier always works in a linear region to ensure the normal work of a receiving channel.

The gain control module automatically adjusts the amplification factor of the satellite signal according to the requirement of subsequent demodulation by using an ACO mode. Because the antenna size is small, the gain control of the part adopts the steps of amplifying by 40dB and then automatically adjusting the attenuation amount according to the actual level floating.

The filtering and gain control module integrally filters the amplified signal by using a cavity filter, so as to inhibit strong interference and reduce the influence of the interference on the received signal as much as possible.

In this part, since the gain amplification of the previous stage is only 40dB, the gain needs to be compensated continuously when the level is low, and therefore, the secondary gain control is adopted to meet the requirement of the subsequent demodulation and decoding. This gain control only amplifies, with a maximum of 28 dB.

The demodulation and decoding module is mainly used for completing demodulation and decoding of satellite data and acquiring satellite transmitted data. Since the satellite is transmitted in DVB-S2 mode, the chip for decoding needs to fully meet the standard of DVB-S2. Meanwhile, because encryption exists in the satellite issuing process, the existing standard DVB-S2 chip is not adopted in the development process, and the FPGA platform is used for independent development. The developed chip not only completes decoding and data output according to the DVB-S2 standard, but also increases the LDPC + BCH part, and simultaneously, the chip also comprises a data decryption module so that the output data is directly decrypted data.

The main control module is a control brain of the whole all-in-one machine and finishes the work of arranging all data. The network interface control is a control unit of a data output interface of the whole all-in-one machine and adopts a standard TCP protocol.

The power supply of the whole system is divided into two parts: the notebook computer is powered by a storage battery carried by the notebook computer; and the power supply of other equipment adopts an external storage battery for power supply.

After the integrated high-frequency extension and receiver integrated machine is completed, the whole system can work normally only by utilizing the storage battery to supply power to the integrated machine.

Because the existing all-in-one machine adopts direct current +24V to supply power, the storage battery adopts direct current +24V output and is a flat lithium battery, and the power supply time is 6 hours. Secured to the interior of the luggage case.

As shown in fig. 4, in order to solve the problem of centralized functions such as amplification, demodulation, data output, etc., and to meet the requirement of a minimum volume, an integrated receiver is designed to realize the functions of a high-frequency slave unit and a receiver.

The integrated receiver adopts an integrated design, is directly connected with the feed source output of an antenna system, and has the functions of LNB (low noise block), demodulation, decoding, data processing and distribution, remote monitoring management, power supply and the like. The equipment is designed as an outdoor unit and is connected with an indoor system by a network and powered by POE. Aiming at the deployment mode that the integrated high-frequency extension set of the original system is independently arranged on an antenna and a receiver is placed in a machine room, the optimized system does not adopt the mode any more. According to the size of the antenna, index adjustment is carried out on the integrated high-frequency extension and the receiver, and an industrial implementation mode is researched. And finally, the integrated high-frequency extension set and the receiver are determined to be made into an integrated machine, and the integrated machine is packaged in a mode of an outdoor protection box and fixed on the back of the antenna.

Because the size of the antenna is reduced, the amplification capability of the original integrated high-frequency extension set is not enough, and therefore the amplification gain of the all-in-one machine is adjusted and increased to meet the requirements of the existing system. In addition, we redefine and encapsulate the interfaces of the all-in-one machine: the original 220V power supply is changed into direct current +24V power supply, and the power supply is provided by a storage battery; the data output interface is changed into a network port and is directly connected with the notebook computer; the signal input port adopts an SMA mode, so that the size of the interface is minimum.

The size of the optimized integrated machine is only 22 multiplied by 15 multiplied by 6cm, and the requirement of system portability is completely met.

The above description is only directed to the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Various modifications may be made by those skilled in the art without departing from the spirit of the invention and the appended claims.

Claims

1. A portable meteorological satellite LRIT data receiving and processing system is characterized by comprising:

the portable box is internally provided with a micro antenna, an integrated receiver and a terminal;

the micro antenna receives meteorological data;

the integrated receiver is connected with an output port of the miniature antenna and is used for processing the LRIT data of the meteorological satellite;

and the terminal connected with the integrated receiver receives and stores the processed meteorological data.

2. The LRIT data receiving and processing system for a portable meteorological satellite according to claim 1, wherein the micro antenna is an n x n element microstrip array panel antenna, n being a positive integer.

3. The LRIT data receiving and processing system for a portable meteorological satellite according to claim 2, wherein each unit is a left-hand and right-hand circularly polarized microstrip array, and each two sub-antennas are connected through a power divider and combined into one unit.

4. The LRIT data receiving and processing system of claim 1, wherein the all-in-one receiver comprises a RF input port, an LNB module, a gain control module, a baseband filtering and gain control module, a demodulation and decoding module, a main control module, and a network interface,

the radio frequency input port is connected with the LNB module, the LNB module is connected with the gain control module, the baseband filtering and gain control module is connected with the demodulation and decoding module, the main control module is connected with the network interface, satellite signals are input from the radio frequency input port, the satellite signals are amplified and filtered by the LNB module, the amplification times of the satellite signals are adjusted by the gain control module, the amplified satellite signals are subjected to integral filtering by the baseband filtering and gain control module, the satellite signals are demodulated and decoded by the demodulation and decoding module to obtain satellite data, the satellite data are subjected to data processing by the main control module, and the processed satellite data are transmitted to the terminal by the network interface.

5. The LRIT data receiving and processing system of claim 4, wherein the all-in-one receiver further comprises a power module, and the LNB module, the gain control module, the baseband filtering and gain control module, the demodulation and decoding module, and the main control module are respectively connected to the power module.

6. The LRIT data receiving and processing system for a portable meteorological satellite according to claim 5, wherein the integral receiver is fixed to a back of the micro antenna.

7. The LRIT data receiving and processing system for a portable meteorological satellite according to any one of claims 1 to 6, wherein the terminal is a laptop computer, a desktop computer or a server.