A 1090es signal expansion method based on phase modulation

A technology of phase modulation and baseband signal, which is applied in baseband system components, shaping network in transmitter/receiver, multi-frequency code system, etc., can solve the problem that the synchronization method cannot be used, and solve the problem of multi-transmit and single-receive synchronization , increase transmission capacity, improve the effect of bandwidth characteristics

Inactive Publication Date: 2017-10-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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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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  • A 1090es signal expansion method based on phase modulation
  • A 1090es signal expansion method based on phase modulation
  • A 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 control surveillance. The signal processing process includes: collection of data information by the signal transmitter, dual modulation of PPM and sub-pulse phase, transmission of expansion signals, reception and synchronization of expansion signals by the signal receiver, demodulation of PPM information and phase information. The key technologies and effects are: 1. The modulation process adopts the segmented linear phase transition method to solve the spectrum expansion problem caused by the phase mutation, which effectively improves the bandwidth characteristics of the 1090ES signal after capacity expansion; 2. The carrier frequency synchronization process uses the leading pulse and 4-bit data The pulse is synchronized twice, which ensures the fast and accurate synchronization, and effectively solves the special multi-send and single-receive synchronization problem of the ADS-B receiver; 3. The demodulation process of the baseband phase information adopts a phase based on error forward feedback Judgment method effectively improves the accuracy of phase judgment.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L27/26H04L27/38
Inventor 王洪孙清清
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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