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1090ES signal expansion method based on phase modulation

A phase modulation, baseband signal technology, applied in baseband system components, shaping networks in transmitter/receiver, multi-frequency code systems, etc. , the effect of increasing transmission capacity and improving bandwidth characteristics

Inactive Publication Date: 2015-04-22
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Claims
  • Application Information

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Problems solved by technology

Among them, the synchronization problem is particularly special. The ground or airborne ADS-B receiver repeatedly receives the 120μs signal broadcast by multiple airborne ADS-B transmitters. It is a burst communication of multiple transmissions and single reception, and the conventional synchronization method cannot be used.

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  • 1090ES signal expansion method based on phase modulation
  • 1090ES signal expansion method based on phase modulation
  • 1090ES signal expansion method based on phase modulation

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Embodiment Construction

[0043] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0044] figure 2 It is the flow chart of 1090ES expansion signal modulation processing in the present invention. The PPM information and phase information are respectively coded and then the expansion signal is modulated and sent. The expansion signal modulation method is explained as follows: the standard 1090ES signal adopts PPM modulation, each bit is 1 μs, and the first 0.5 The 0.5 μs low level after μs is high level represents bit data “1”, conversely, the first 0.5 μs is low level and 0.5 μs high level represents bit data “0”. On the basis of the standard 1090ES signal, the expansion signal performs phase modulation on the 0.5μs high-level sub-pulse in each bit of the data pulse. The modulation methods that can be selected are: BPSK, QPSK, MPSK, and DPSK, etc. The different modulation methods increase The amount...

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Abstract

The invention discloses a 1090ES signal expansion method based on phase modulation, and relates to the field of civil aviation air traffic management monitoring. The process of signal processing includes the following steps that data information is collected by a signal transmitting terminal, phase dual modulation is carried out on PPM and a sub-pulse, an expansion signal is transmitted, the expansion signal is received and synchronized by a signal receiving terminal, and demodulation is carried out on PPM information and phase information. The key technology and effect are characterized in that in the modulation process, a piecewise linearity phase transition method is used to solve a frequency spectrum problem caused by phase mutation, and a band width character of an expanded 1090ES signal is improved effectively; in the carrier-frequency synchronization process, twice synchronization is performed by using a front guide pulse and a four-digit pulse, the quickness and accuracy of the synchronizations are guaranteed, and a special synchronization problem of multiple output and single input of an ADS-B receiver is solved effectively; in the base band phase information demodulation process, a phase judgment method based on error forward feedback is used, and the accuracy of the phase judgment is improved effectively.

Description

technical field [0001] The invention belongs to the field of air traffic control monitoring of civil aviation, and in particular relates to a capacity expansion technology for ADS-B 1090ES signals. Background technique: [0002] The new generation of air traffic control surveillance technology ADS-B (Automatic Dependent Surveillance-Broadcast) is gradually being promoted and applied in China, and may become the main surveillance means in my country's long-term planning. ADS-B realizes the monitoring function of the secondary radar, and also has the functions of navigation and communication, but due to the limited data carried by the signal, only a small amount of important information can be transmitted. The globally interoperable ADS-B extended message data link recommended by ICAO is 1090MHz Extended Squitter (1090ES), the signal length is 120μs, the first 8μs is the leading pulse, and the last 112μs is the data pulse. The data adopts pulse position modulation (PPM), one f...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/26H04L27/38
Inventor 王洪孙清清
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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