A device and method for finding thermal noise data in a/c and s mode overlapping signals
A technology of signal data and overlapping signals, which is applied in the field of thermal noise data processing, can solve the problems of poor real-time performance and adaptability, difficulty in finding the estimation of statistical characteristics of data segments, etc., and achieve estimation, good real-time performance and adaptability Effect
Active Publication Date: 2019-08-16
THE SECOND RES INST OF CIVIL AVIATION ADMINISTRATION OF CHINA
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[0005] (1) When the number of transmitting sources is large, the following situation often exists in the actual data: A / C mode and S mode signals of different amplitudes and lengths overlap, showing that there are signals + noise in the longer received data segment , it is difficult to find a suitable enough data segment (data with only thermal noise) to estimate the statistical characteristics of thermal noise
[0006] (2) In practice, the properties of the system and the environment are changing, and it is necessary to estimate the thermal noise characteristics in real time and adaptively. The real-time and adaptive properties of conventional methods are poor
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[0034] Such as figure 1 , figure 2 Shown, a kind of device of looking for thermal noise data in A / C and S mode overlapping signal, comprises data acquisition unit (1), data processing unit (2) and data output unit (3); Described data acquisition unit ( 1) It is used to collect a section of signal data in the A / C mode and S mode overlapping signals; the data processing unit (2) is used to process the signal data collected by the data acquisition unit (1) and send it to the The data output unit (3); the data output unit (3) is used to output the data processed by the data processing unit (2).
[0035] A method for finding thermal noise data in A / C and S mode overlapping signals, comprising:
[0036] Step 201, define an integer variable as the number of cycles, and set the initial value of the number of cycles to 1; set two data sets, one is the estimated sample set, and when initially set, there is no element in the estimated sample set; one Is the data sliding window, the d...
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The invention discloses a device and method for searching thermal noise data in overlapping signals of A / C mode and S mode. The device includes a data acquisition unit, a data processing unit and a data output unit; the data acquisition unit is used to collect a section of signal data in A / C mode and S mode overlapping signals; the data processing unit is used to process the collected signal data, and Sent to the data output unit; the data output unit is used to output the data processed by the data processing unit; the device and method proposed by the present invention can be used in arbitrary length A / C mode data and noise, S mode signal data and noise or A / C mode data + S mode signal data and noise to find the thermal noise data in the overlapping data segment, this method has good real-time and adaptability, and can better realize the thermal Estimation of noisy data data and their statistical properties. In practice, this method is not limited to the search for thermal noise data, but also for finding clutter or data with random properties.
Description
technical field [0001] The invention relates to the field of thermal noise data processing, in particular to a device and method for searching thermal noise data in A / C and S mode overlapping signals. Background technique [0002] A / C mode and S mode are the main communication link protocols of MLAT (Multipoint Surveillance Technology) system, ADS-B (Automatic Dependent Surveillance-Broadcast) and secondary radar system, and have been widely used in the field of civil aviation traffic control. The center frequencies of the A / C mode and S mode signals are both 1090MHz, and both belong to pulse position modulation, that is, the position and level of the sub-pulse are used to represent information. [0003] In practice, it is often necessary to accurately estimate the statistical properties of the thermal noise in the A / C mode and S mode received signals, and the estimated statistical properties of the thermal noise will play a key role in the subsequent decoding process. [0...
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IPC IPC(8): G06F17/10
CPCG16Z99/00
Inventor 刘卫东彭卫郭建华张凯
Owner THE SECOND RES INST OF CIVIL AVIATION ADMINISTRATION OF CHINA