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Radio the tester frequency measurement algorithm research and

Author: LiYuanZuo
Tutor: TangYouXi
School: University of Electronic Science and Technology
Course: Communication and Information System
Keywords: Frequency Measurement Zero crossing detection Prony Accuracy Frequency Modulation
CLC: TM935.1
Type: Master's thesis
Year: 2011
Downloads: 84
Quote: 1
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Abstract


The tactical radio widely used in military command and control and logistical communication, the communication quality of a direct impact on the timeliness of the dispatch of troops and fire support. To ensure reliable communication quality on the radio on a regular basis to detect and maintenance. The frequency measurement is an important means of radio detection, and played a pivotal role in the field of wireless communications, electronic warfare and earthquake monitoring. In recent years, fast, high-precision frequency measurement algorithm by the attention of many scholars at home and abroad. Over the years, radio detection and maintenance rely on traditional measuring instruments, these instruments are many kinds of low efficiency and single function, can not meet the radio types and models growing development requirements. Most of the existing instruments for radio frequency measurement using the FFT algorithm, the FFT inherent spectral leakage and picket fence effect limits the improvement of frequency measurement accuracy. In this paper, the the radio tester frequency measurement algorithm research. First, the paper examines the time domain, frequency domain, time-frequency domain and power spectrum analysis the four frequency measurement technology, application scenarios and measurement accuracy. New portable radio the tester frequency measurement needs, choose the zero-crossing detection and the Prony frequency measurement algorithm study focused on. Then, in the SSB signal or FM signal input, respectively simulation analysis of sampling points, the signal-to-noise ratio and the sampling rate of the three parameters of frequency measurement accuracy. Determine the choice of the zero-crossing point detection algorithm for short-wave radio frequency measurement, selection of the Prony algorithm FM radio frequency measurement. Finally, in the DSP to achieve the zero-crossing detection and the Prony frequency measurement algorithm and design different scenarios to verify the effectiveness of the algorithm: (1) for the short-wave radio, fixed frequency measurement accuracy of 5.3 × 10 -7 ; hop rate is 50 hops / sec, frequency measurement absolute error less than 900HZ accuracy of 7 × 10 -5 ; (2) FM radio, fixed frequency measurement accuracy 4.9 × 10 -7 ; hop rate of 500 hops / s, the absolute frequency measurement error is less than 200Hz, the accuracy of 2 × 10 -6 ; only 50 in the input data point, the demodulated signal frequency measurement accuracy of 0.8%. The above test results meet the radio the tester frequency of measurement needs. This paper presents the frequency measurement program communication system frequency measurement and frequency synchronization reference.

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CLC: > Industrial Technology > Electrotechnical > Electrical measurement techniques and instruments > Frequency, waveform parameter measurement and instrumentation > Wavelength,frequency ( time) measurement and instrumentation
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