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Multi-path microwave digital receiver

A digital receiver and microwave receiving technology, applied in electrical components, transmission systems, etc., can solve problems such as lack of data transmission, confidentiality, reliability, maintainability that cannot satisfy users, and limited number of frequency points used, etc., to achieve Reduce system costs, improve rapid deployment and maintainability, and save the number of uses

Active Publication Date: 2014-04-16
西安烽火电子科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since most of the current domestic digital image transmission products use the MPEG-2 / MPEG-4 image compression algorithm and are assembled using foreign COFDM modulation modules, the number of frequency points used is limited, and they basically work in a point-to-point mode without data The ability of transmission cannot meet the needs of users in the occasions where confidentiality, reliability, and maintainability are required.

Method used

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  • Multi-path microwave digital receiver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Transmitter

[0026] Considering the propagation characteristics of the microwave system in the wireless channel, and the propagation path between the transmitter and the receiver may be the line of sight between two points, and there may be obstacles such as mountains and buildings. Therefore, the transmitter is divided into multiple situations during deployment. First, the basic transmitter unit composed of an acquisition camera (head), a microwave transmitter, and a transmitter antenna can be deployed in a high-altitude and short-distance environment (transmitter A); When there are obstacles such as mountains, highlands, and buildings, a relay device (transmitter B) is added between the basic transmitting unit and the receiving end (such as the top of the mountain highland, the top of the building) to complete the forwarding of image information; finally, If it is necessary to transmit data, a data transmitting terminal can be added on the basis of the bas...

Embodiment 2

[0034] Example 2: Receiver

[0035] According to the requirements of the use environment, the receiving end selects a single-channel receiving device (receiving end A) under the limited site and single transmission requirements, and directly uses the monitor to complete the reproduction of the transmitting end information; when multi-point transmission and multi-scenario monitoring are required, select multiple The receiving device (receiving terminal B) uses a monitor to reproduce the information of multiple transmitting terminals.

[0036] Receiver A form

[0037] Such as Figure 5 As shown, when required for general use, it is used with a single transmitter, using Form A, including image monitor, computer, single-channel microwave receiver and antenna. The antenna receives the electromagnetic wave signal and sends it to the single-channel microwave receiver. The single-channel microwave receiver restores the useful signal to the real-time video image information or data i...

Embodiment 3

[0045] Embodiment 3: network server side

[0046] Since the microwave digital image transmission system transmits space through electromagnetic waves, it has certain advantages in emergency communication, rapid deployment, and mobility flexibility, but is subject to certain constraints in communication distance. In order to meet the requirements of remote access, use, and command The function is added to the network server side, and the existing public information network such as the Internet, 3G network and other wired networks are used to improve the application range of the system.

[0047] Such as Figure 11 As shown, it is also possible to add a network server at the back end of the microwave receiver, such as computer terminal / server, 3G network terminal and other equipment. Connect the Ethernet interface of the microwave receiver to the computer terminal or server connected to the Internet, and through IP, the remote computer on the Internet can access the microwave re...

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Abstract

The invention discloses a multi-path microwave digital receiver, which comprises an H.264 image decoding unit, a plurality of channel demodulation units, a plurality of microwave receiving channel units, a microwave radio frequency receiving unit, a splitter unit, a master control unit and a power supply, wherein the microwave radio frequency receiving unit selectively receives electromagnetic waves of available frequency bands, performs gain amplification, transmits the electromagnetic waves into the splitter unit, and uniformly distributes radio frequency signals to each microwave channel; a plurality of microwave receiving channels internally utilize a superheterodyne receiving technology and a broadband phase locking technology, outputs fixed intermediate frequency signals by twice frequency conversion, and transmits the fixed intermediate frequency signals into the demodulation unit, and outputs accurate baseband digital signals corresponding to an inverse process of a transmitter modulation way; and the digital signals are transmitted into the H.264 image decoding unit, decoded and recovered into the video information and output by an analogue interface if being judged to be real-time video information according to a certain communication protocol, and are transmitted into the master control unit, subjected to corresponding data format conversion and transmitted to an Ethernet interface for output if being judged to be data information.

Description

technical field [0001] The invention relates to a multi-channel microwave digital receiver, which belongs to the technical field of microwave communication. Background technique [0002] The digital image transmission system has many outstanding advantages such as strong anti-interference ability, adaptability to multiple multiplexing systems, and strong confidentiality. The products have been widely used in various fields such as public security, fire protection, traffic monitoring, coastal defense, and military affairs. [0003] Since most of the current domestic digital image transmission products use the MPEG-2 / MPEG-4 image compression algorithm and are assembled using foreign COFDM modulation modules, the number of frequency points used is limited, and they basically work in a point-to-point mode without data The ability of transmission cannot meet the needs of users in the occasions where confidentiality, reliability, and maintainability are required. Contents of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/16
Inventor 张凡杨勇张勋勋王博一吕奇曹军勤王平吴改宁蔺晓星
Owner 西安烽火电子科技有限责任公司