A Detection Method of 1090es ADS-B Message Header
A detection method and header technology, applied in the field of signal processing, can solve the problems of judgment error, inability to accurately and effectively detect the rising edge, falling edge and valid pulse position of the leading pulse, missed detection of the header, etc.
Inactive Publication Date: 2018-10-19
CHINA ELECTRONICS CORP 6TH RES INST
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Problems solved by technology
However, when the signal-to-noise ratio is relatively low, the header miss rate of traditional detection methods is high
For example, when the signal amplitude of the four leading pulses fluctuates strongly, the pulse position detection method cannot accurately and effectively detect the rising edge, falling edge and effective pulse position of each leading pulse
Especially for weak signals, judgment errors are prone to occur due to interference, resulting in missed header detection
Method used
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[0170] An embodiment of the above valid header confirmation is introduced as follows:
[0171] S1: Set the initial parameter values as follows:
[0172] The sampling frequency f1 is 25MHz;
[0173] The window length n of the detection window is 125; the detection window can use a 125-bit shift register. In order to avoid confusion with the shift register used to store power and value, in this example, the word detection window is still used for introduction;
[0174] The length m of the shift register is 3;
[0175] The number of sampling points w extracted in the 0.5us time period is 10;
[0176] The delay time t1 under the sampling frequency f1 is 40ns.
[0177] Then: the detection window has a total of 125 data bits, which are respectively recorded as D1, D2...D125;
[0178] There are 3 data bits in the shift register, which are respectively marked as: E1, E2 and E3;
[0179] S2, according to the sampling frequency of 25MHz, continuously sample the 1090ES ADS-B digit...
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The present invention provides a method for detecting a 1090ES ADS-B message leading pulse. The method comprises the steps of storing sample points in corresponding data bits of a detection window according to a sampling time sequence; each time when a new sample point is received, storing the new sample point behind a D1 data bit of the detection window, determining whether the new sample point meets both a condition 1 and a condition 2, if the new sample point meets both the condition 1 and the condition 2, executing the next step, otherwise, continuing to sample; outputting a signal X1, wherein a display position is t3+t1; after the signal X1 is output, continuing to sample, determining whether another new sample point meets both the condition 1 and the condition 2, if the another new sample point meets both the condition 1 and the condition 2, constantly outputting X1, and continuing to sample; and as long as it is determined for the first time that a following new sample point meets the condition 1 or the condition 2, or meets neither the condition 1 nor the condition 2, outputting a signal X2, wherein a display position is an effective position wherein a fourth leading pulse in the header finishes. The method is used for dynamically matching and detecting energy, has a higher detection probability, and reduces the condition that the omission ratio increases as the signal to noise ratio lowers.
Description
technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a detection method for a 1090ES ADS-B message header. Background technique [0002] ADS-B, that is: Automatic Dependent Surveillance-Broadcast technology, is a modern air traffic control technology that integrates advanced wireless data communication technology, satellite positioning and navigation information transmission technology, automatic surveillance technology and other related technologies. ICAO) is actively promoting a navigation surveillance technology. [0003] ADS-B system is an information system integrating communication and monitoring, including: airborne equipment, data link and ground receiving station; airborne equipment transmits its position, altitude, speed and other data in a periodic manner through the transmitter Information, the data information is in the form of ADS-B messages, broadcast through air-air, air-ground data links. At...
Claims
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IPC IPC(8): H04L12/26G08G5/00
Inventor 王永利
Owner CHINA ELECTRONICS CORP 6TH RES INST