Real-time correction method and system for transmitting signal frequency offset of highly dynamic moving carrier

A technology for moving carriers and transmitting signals, which is applied in the field of communication and can solve problems such as ineffective use

Active Publication Date: 2016-06-01
北京航天科工世纪卫星科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current communication terminals all have forward signal acquisition and tracking channels, which can accurately estimate the frequency offset of the received signal. This frequency offset estimate can be used for signal reception and data processing. The real-time frequency offset adjustment of the transmitted signal of the highly dynamic moving carrier may meet the frequency offset requirements of the system for the transmitted signal. limit contribution

Method used

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  • Real-time correction method and system for transmitting signal frequency offset of highly dynamic moving carrier
  • Real-time correction method and system for transmitting signal frequency offset of highly dynamic moving carrier
  • Real-time correction method and system for transmitting signal frequency offset of highly dynamic moving carrier

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Embodiment 1

[0034] Based on the above basic idea, the method specifically includes the following steps:

[0035] Step 1: The highly dynamic moving carrier captures the received signal, and performs frequency mixing, correlation and loop tracking on the received signal to obtain an estimated frequency offset value Dop of the received signal.

[0036] Step 2: The high-dynamic motion carrier frames the transmission information to form a transmission signal in a standard format and transmits it. The time from the completion of the transmission signal framing to the transmission of the transmission signal is recorded as the signal transmission time T.

[0037] The above-mentioned transmission information includes its own state data and data collected by the sensor.

[0038] Considering that the speed of the high dynamic motion carrier is fast, its movement will also have a certain impact on the frequency offset of the transmitted signal within the signal transmission time T of the high dynamic...

Embodiment 2

[0047] Based on the method provided in Embodiment 1, the present invention also provides a real-time correction system for transmitting signal frequency deviation specifically for high-dynamic motion carriers. The module design of the system matches the functional modules of high-dynamic motion carriers, and can be integrated in On the high dynamic motion carrier, the high dynamic motion carrier itself has functional modules such as a radio frequency module, a receiving baseband processing module, a transmission processing module, and a sensor, and the radio frequency module has a crystal oscillator.

[0048]The frequency offset real-time correction system provided in this embodiment includes an SPI switch, a digital-to-analog converter DAC, and a voltage-controlled oscillator VCO, and a correction calculation function is added in the transmission processing module. The transmission processing module is connected to the input of the DAC through the SPI switch, the output of the...

Embodiment 3

[0079] The workflow of the frequency offset real-time correction system provided by the above-mentioned embodiment 2 is as follows:

[0080] The radio frequency module is first capable of transmitting signals, which are received by the ground station.

[0081] If the ground station needs to obtain carrier status information, it sends a communication signal to the carrier, the communication signal is also received by the radio frequency module, and the received signal is transmitted by the radio frequency module to the receiving baseband processing module, and the receiving baseband processing module receives the signal and captures the received signal, Tracking and other processing, so as to obtain the frequency offset estimation value of the received signal;

[0082] The transmission processing module has two functions of signal framing and correction calculation. On the one hand, it can receive sensor data and form a frame to form a transmission signal format and send it to ...

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Abstract

The invention discloses a high-dynamic motion carrier transmitted signal frequency offset real-time correction method and system, and belongs to the communication field. The correction method particularly includes the steps that firstly, a high-dynamic motion carrier captures and tracks a received signal to obtain a frequency offset estimated value of the received signal, then frequency offset of a transmitted signal is computed and compensated in advance according to the proportional relation of the carrier frequency of the transmitted signal and the carrier frequency of the received signal, and therefore the frequency offset of the transmitted signal is within a required scope. According to the correction method, the high-dynamic motion carrier transmitted signal frequency offset real-time correction system is provided at the same time. A correction computing module is used in the correction system to conduct frequency offset computing, the computed total frequency offset value controls a DAC and a VCO, and the crystal oscillator frequency of the transmitted signal is further controlled. According to the high-dynamic motion carrier transmitted signal frequency offset real-time correction method and system, transmitted signal frequency offset real-time correction on the high-dynamic motion carrier can be achieved.

Description

technical field [0001] The invention relates to a method and a system for real-time correction of frequency deviation for a signal transmitted by a high-dynamic dynamic carrier and belongs to the field of communication. Background technique [0002] For a high-speed moving carrier, if it wants to communicate with the ground station, it needs to use a relay communication system. In the relay communication system, because the traditional carrier usually moves at a low speed, there is no requirement for the frequency offset of the transmitted signal. However, the carrier When moving at high speed, a large Doppler frequency deviation will be generated, which may exceed the passband of the relay filter, resulting in attenuation of the signal and affecting the reception of the signal by the ground station. Therefore, for some high-speed moving carriers, it is necessary to pre-adjust the frequency offset of the transmitted signal. [0003] Traditional carrier signal frequency offs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02
Inventor 李玉洁丁峰郭振宗关晓磊单立超
Owner 北京航天科工世纪卫星科技有限公司
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