Decoding Method of Selective Call Signal in Segmentation Processing Airborne Selective Call System
A technology of selective call and decoding method, which is applied in speech analysis, instruments, etc., can solve the problems of inability to accurately judge signal frequency components, inability to process selective call signals at one time, long duration of selective call signals, etc., to meet the calculation requirements and The effect of real-time requirements, ensuring project realization, and reducing the probability of misjudgment and missed judgment
Active Publication Date: 2018-05-04
10TH RES INST OF CETC
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[0005] 1. The implementation method based on the time-domain filter bank has strict requirements on the filter bandwidth, and high-order filters need to be used, which has a large amount of calculation and is not conducive to engineering implementation;
[0006] 2. The implementation method based on frequency-domain Fourier transform is limited by the frequency resolution, so it is impossible to accurately judge the frequency component of the signal, and it is prone to missed and wrong judgments;
[0007] 3. Due to the long duration of the selective call signal, the implementation method based on frequency domain Fourier transform cannot process the selective call signal at one time
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[0022] refer to figure 1 . In the embodiments described below, the subsection processing airborne selective call system mainly includes: a signal acquisition module, a signal preprocessing module, a power spectrum estimation module, an energy center of gravity correction module, a state judgment module and a jump module. In the selective call system decoder, the signal acquisition module is used to collect the input signal of the audio equipment, and the sampling rate of the audio equipment usually collected by the signal acquisition module is 8KHz. Considering the frequency resolution, the signal length of each frame can be set to 1024 points. The signal acquisition module performs windowing modulation on the collected single-frame signal through the signal preprocessing module. Considering the performance of the main lobe and side lobe of the window function, the windowing modulation selects the Hanning window as the window function, and adopts the method of windowing and t...
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The present invention proposes a decoding method for segmented processing of a selective call signal of an airborne selective calling system, aiming to provide a decoding method with small calculation amount, high estimation accuracy, and reduced probability of misjudgment and missed judgment. The technical scheme is realized: the signal acquisition module performs window modulation on the collected single-frame signal through the signal preprocessing module, and processes the selective call signal in frames, and then uses the periodogram method to analyze the single-frame signal of each frame through the power spectrum estimation module. Estimate with the power spectrum of the windowed modulated signal to obtain a rough estimate; the estimated result is corrected by the energy center of gravity correction module to correct the frequency power spectrum estimate and amplitude estimate near the reference frequency of the selective call signal to obtain a high-precision frequency estimate value and amplitude estimated value, the state decision module synthesizes the results of each frame, and uses the accurate estimated value to make a state decision.
Description
technical field [0001] The invention relates to a decoding method for an airborne selective calling system. Background technique [0002] The airborne selective call system is a system used for point-to-point communication between the ground tower and the designated aircraft through the short-wave radio or ultra-short-wave radio. When the ground staff needs to call a specific aircraft, select the selective call code of the aircraft to be called through the coding panel, and the encoder generates an analog selective call signal in a specific format according to the set selective call code, and sends the The signal is sent to the aircraft in the airspace. All aircraft in the airspace decode the signal, and compare the decoding result with its own inherent code. If they are the same, they will output light and sound prompts through the warning panel to remind the pilot to listen, otherwise they will not respond. The selective call signal consists of 2 tone pulses, each pulse ...
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IPC IPC(8): G10L21/0208
Inventor 吕燚郝莹耀李锋
Owner 10TH RES INST OF CETC