Modulation index self-adaptive multi-symbol detection and demodulation device and demodulation method
A multi-symbol detection and modulation index technology, which is applied in the modulation carrier system, modulation type identification, phase modulation carrier system, etc., can solve the problem of large amount of calculation, etc., achieve less hardware resource consumption, easy implementation, and reduce multiplier overhead Effect
Active Publication Date: 2022-06-21
天津讯联科技有限公司
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Problems solved by technology
The key link of multi-symbol detection and demodulation is the realization of the bit synchronization function. The multi-symbol detection using the "sooner or later gate" bit synchronization method requires at least two complex multi-symbol detection calculation branches, and the calculation amount is huge
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Embodiment 1
[0128] This embodiment is aimed at the C-band deep space CPFSK telemetry demodulation, adopts the hardware structure of the superheterodyne structure, can effectively resist out-of-band interference, and the software algorithm part adopts the automatic frequency control technology, such as Figure 7-Figure 9 as shown, Figure 7 It is the composition schematic diagram of embodiment 1.
[0129]The signal first passes through the low-noise amplifier. The advantage of the low-noise amplifier being located in front of the No. 1 bandpass filter is that the noise figure of the system is lower, and the signal strength of deep space telemetry is weaker. The lower system noise figure represents better demodulation performance. , the low noise amplifier model is HMC717A, the amplifier has a noise figure as low as 1.1db, and the frequency response range can cover the low C frequency band of 4.8-6.0GHz. The No. 1 bandpass filter mainly realizes the bandpass filtering function and suppresse...
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The invention provides a modulation index self-adaptive multi-symbol detection and demodulation device and its demodulation method, including analog-to-digital conversion, quadrature down-conversion, automatic frequency control, modulation index identification, sampling rate adjustment, multi-symbol detection and bit synchronous control. The modulation index self-adaptive multi-symbol detection and demodulation device and its demodulation method of the present invention enable the multi-symbol detection and demodulation algorithm to adapt to the large Doppler frequency between the telemetry transmitter and the receiver by adding an automatic frequency control module. shift, the automatic control algorithm consumes less hardware resources and is easy to implement; the multi-symbol detection algorithm of the present invention has a modulation index automatic recognition function, and can realize high-performance demodulation at the receiving end when the modulation index of the telemetry transmitter is unknown. Moreover, the modulation index automatic identification algorithm has low complexity, less hardware resource consumption, and high identification accuracy.
Description
technical field [0001] The invention belongs to the field of CPFSK telemetry communication in the field of aerospace telemetry, and in particular relates to a modulation index self-adaptive multi-symbol detection and demodulation device and a demodulation method thereof. Background technique [0002] As we all know, PCM-CPFSK is currently the most widely used modulation system in the field of aerospace telemetry, which is related to its many advantages, such as constant signal envelope, continuous phase, high frequency band utilization, less affected by aircraft exhaust, and anti-phase Strong noise capability, etc. However, in the field of aerospace telemetry, the communication target is far away, and the signal-to-noise ratio of the telemetry signal received by the telemetry receiver is low. Compared with the traditional phase modulation signal, the demodulation ability of FM signals such as CPFSK is poor, and the demodulation threshold is high. Effective means are used to ...
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IPC IPC(8): H04L27/00H04L27/22
CPCH04L27/0012H04L27/22
Inventor 王仁智展鹏飞孔雅李东武何志明
Owner 天津讯联科技有限公司