Method for adjusting transmission channel time delay of satellite navigation digital multi-beam system

A digital multi-beam and transmission channel technology, applied in satellite radio beacon positioning system, radio wave measurement system, measurement device, etc., can solve the problems of inconsistency in signal delay between channels, affecting the pointing accuracy of synthetic beams, etc., and achieve adjustment accuracy high effect

Active Publication Date: 2017-02-22
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

However, in practical applications, the software and hardware between different channels cannot be completely consistent, resulting in inconsistent signal delays between channels, which in turn affects the pointing accuracy of the synthesized beam

Method used

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  • Method for adjusting transmission channel time delay of satellite navigation digital multi-beam system
  • Method for adjusting transmission channel time delay of satellite navigation digital multi-beam system
  • Method for adjusting transmission channel time delay of satellite navigation digital multi-beam system

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Embodiment Construction

[0038] The application flow chart of the satellite navigation digital multi-beam system transmission channel delay adjustment method of the present invention is as follows figure 1 As shown, this method adjusts the internal second pulse and pseudo-code clock by controlling the phase control word of the internal DDS of the digital multi-beam transmitting terminal, and realizes the adjustment of the transmission channel delay; this method can automatically implement multiple transmissions under software control. Channel delay is adjusted.

[0039] The specific steps are as follows:

[0040] (101) Measure the time interval between the rising edge of the second pulse externally provided and the initial phase rising edge of the pseudocode signal generated internally in the current transmission channel, and this time interval is the time delay value t of the current transmission channel 1 ; The digital multi-beam transmitting terminal generates a navigation spread spectrum signal, ...

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Abstract

The invention discloses a method for adjusting the transmission channel time delay of a satellite navigation digital multi-beam system. The method comprises the following steps: measuring a transmission channel time delay value; calculating a time delay error; judging whether adjustment is needed according to the time delay error; if adjustment is finished or not needed, preparing for time delay adjustment of the next channel; otherwise, calculating the time delay adjustment amount according to the time delay error; performing coarse adjustment of the time delay; and performing fine adjustment of the time delay and preparing for time delay adjustment of the next channel. High-precision adjustment of a pseudo code clock and a second synchronization pulse is realized by controlling the phase control word of the internal DDS of a transmission terminal so as to quickly and accurately adjust the transmission channel time delay of the multi-beam system, and automatic adjustment of the time delay of multiple transmission channels can be realized under software control.

Description

technical field [0001] The invention relates to a time delay adjustment method of a transmission channel. Satellite navigation digital multi-beam launch system has the function of uplink injection to multiple satellites at the same time. Background technique [0002] The digital multi-beam transmitting system combines array antenna and digital signal processing technology, and has the function of uplink injection to multiple satellites at the same time. The baseband signal generation and beam synthesis of the digital multi-beam system are both realized in the digital domain. The synthesized digital signal is transformed into an analog radio frequency signal through D / A and up-conversion, and is radiated by the antenna element to form a corresponding beam in the air. [0003] Since the entire transmission system requires multiple transmission channels to work together, all transmission channels are required to have the same time delay. However, in practical applications, th...

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Application Information

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IPC IPC(8): G01S19/02
CPCG01S19/02
Inventor 韩双林尹继凯李刚董立桥王跃翟江鹏
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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