Frequency hopping signal polarity diversity merging method

A frequency hopping signal and signal technology, applied in the field of telemetry communication, can solve the problem that frequency hopping signal is no longer suitable for diversity and combination, and achieve the effects of optimal transmission signal-to-noise ratio, fast processing speed and simple structure

Active Publication Date: 2017-06-13
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0005] Since the traditional telemetry system adopts a fixed-frequency system, the signal frequency and phase adjustment is realized through a closed-loop method of a phase-locked loop, and the frequency-hopping system cannot be eliminated in time by

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  • Frequency hopping signal polarity diversity merging method
  • Frequency hopping signal polarity diversity merging method
  • Frequency hopping signal polarity diversity merging method

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Embodiment Construction

[0033] Attached below image 3 The present invention will be further described in detail with specific embodiments:

[0034] The system has a frequency hopping bandwidth of 200MHz and a code rate of 10Mbps. Antenna diversity is adopted to resist multipath fading. In order to achieve good transmission performance, synchronization acquisition must be performed after diversity formation. At the same time, in order to ensure the signal-to-noise ratio during diversity formation, it is necessary to Diversity composition is performed after hopping, because after dehopping, the signal becomes a narrowband signal, and the signal-to-noise ratio is improved by 13dB ( ). Therefore, the signal processing flow at the receiving end is first de-hop, filter extraction, diversity integration, demodulation and decoding, so that the best transmission performance can be achieved.

[0035] The biggest difference between frequency hopping system modulation and demodulation and general continuous carrie...

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Abstract

The invention relates to a frequency hopping signal polarity diversity merging method. The method comprises the following steps: firstly, carrying out AD sampling on signals received by levorotation and dextrorotation rotation polarizing antennas, and obtaining two paths of baseband signals after digital down conversion; then carrying out conjugate multiplication on the levorotation and dextrorotation baseband signals, performing FFT conversion to obtain a frequency offset estimated value and a phase offset estimated value of the levorotation baseband signal, and correcting the deviation to accomplish the open loop correction of the levorotation branch; and finally carrying out weighted merging on the corrected baseband signal to accomplish the polarity diversity merging of frequency hopping signals. The invention provides a frequency hopping signal polarity diversity merging processing method, in which the frequency offset and phase offset of two paths of signals are processed in real time in an open loop control mode, compared with the closed loop control mode, the method has the advantages of simple structure, high processing speed and the like, and the method is very suitable for receiving frequency hopping telemetering signals to realize an optimal transmission signal-to-noise ratio.

Description

Technical field [0001] The invention relates to the field of telemetry communication, in particular to a polarization diversity combining method for frequency hopping signals. Background technique [0002] The telemetry system is an indispensable and important part of the ballistic missile system. During the development of the ballistic missile's life, the telemetry system is used to obtain the working status parameters and environmental data of each system in the flight test, in order to determine the missile performance or perform failure analysis. Provide evidence. [0003] In the missile telemetry system, the radio channel plays the role of information transmission between the on-board telemetry data collector and the ground data processing station. It serves as a bridge for the mutual transmission and communication of information between the missile and the ground launch control and command system. Low latency requires strong robustness, that is, transmission reliability. Es...

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Application Information

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IPC IPC(8): H04B1/713H04B1/715H04B1/711
CPCH04B1/711H04B1/713H04B1/715
Inventor 顾嘉辉王乐唐硕胡秘唐文照
Owner XIAN INSTITUE OF SPACE RADIO TECH
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