A Method for Extending the Frequency Offset Estimation Range of Telemetry Coherent Receiver
A coherent receiver and frequency offset estimation technology, applied in the field of telemetry, can solve the problems of high cost and increased software complexity, and achieve the effects of high work efficiency, improved performance, and low computational overhead
Inactive Publication Date: 2014-04-23
TSINGHUA UNIV
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Problems solved by technology
The complexity of the software increases with the increase of the frequency offset estimation range, and the cost is relatively large
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[0035] The functional block diagram of the frequency estimation module as shown in Figure 5, as shown in Figure 6 work flow diagram.
[0041]
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The invention belongs to the field of telemetry, and in particular relates to a method for expanding the frequency offset estimation range of a telemetry coherent receiver. Under the PCM-FM system, the invention uses the frequency estimation module to estimate the frequency offset of the PCM-FM intermediate frequency signal, assists the synchronization of the synchronization module of the original MSD system, thereby increasing the frequency offset estimation range of the MSD system. The invention uses a simple complex multiplication-accumulation circuit, which can expand the frequency offset estimation range of MSD demodulation by tens of times, thereby extending the frequency offset estimation range of the MSD system. The frequency offset estimation range is wide, the frequency offset estimation speed is fast, the demodulation performance is good, the circuit is simple, the calculation cost is small, and the work efficiency is high. The present invention can be applied to PCM-FM system telemetry receiving equipment in high-frequency and high-noise telemetry task environments such as missiles and rockets, greatly reduces equipment complexity, and effectively improves the performance of the PCM-FM system telemetry receiver.
Description
A method for extending the frequency offset estimation range of a telemetry coherent receiver Technical field [0001] The invention belongs to the field of telemetry, in particular to a method for extending the frequency offset estimation range of a telemetry coherent receiver. Background technique The PCM-FM system is the general telemetry system of various countries at present, and its production principle is: the telemetry information to be measured is carried out After sampling, quantization, and digitization, a PCM baseband data stream is formed. The PCM data stream modulates the frequency of the carrier to form a PCM-FM signal No. There are two kinds of demodulation modes in PCM-FM system, traditional demodulation uses non-coherent frequency discrimination demodulation, derivation to PCM-FM signal Finally, an FM and AM signal is obtained, and its AM envelope contains baseband information, so envelope detection is performed on the derived signal The baseband inf...
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IPC IPC(8): H04L27/26
Inventor 王鹏谷源涛梅顺良
Owner TSINGHUA UNIV
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