阅读说明：本技术 一种短波通信系统馈线损坏在线自动定位方法 (Short wave communication system feeder line damage on-line automatic positioning method ) 是由 金珠 王程琳 马银圣 胡俊 朱振飞 赵天然 于 2021-08-06 设计创作，主要内容包括：本发明公开了一种短波通信系统馈线损坏在线自动定位方法,包括如下步骤：步骤1,通过定向耦合器在线采集正向耦合信号和反向耦合信号：步骤2,分析正向耦合信号和反向耦合信号的中心频率：步骤3,计算每个频率的反向耦合信号和正向耦合信号之间的相位差：步骤4,根据相位差建立方程组求解周期差：步骤5,计算出有效馈线长度,完成损坏位置定位,从而完成损坏位置定位。本发明所公开的定位方法,能在通信系统不停止工作的情况下在线检测馈线损坏,既无需配置专用馈线检测仪器,也无需人工操作,仅仅利用通信系统自身发射的信号就可以实现对馈线损坏位置的精确定位,在实现了在线、及时维护通信系统的同时还节约了人工成本。(The invention discloses an on-line automatic positioning method for feeder damage of a short wave communication system, which comprises the following steps: step 1, collecting a forward coupling signal and a reverse coupling signal on line through a directional coupler: step 2, analyzing the center frequency of the forward coupling signal and the reverse coupling signal: and 3, calculating the phase difference between the reverse coupling signal and the forward coupling signal of each frequency: step 4, establishing an equation set according to the phase difference to solve the periodic difference: and 5, calculating the length of the effective feeder line, and completing the damaged position positioning, thereby completing the damaged position positioning. The positioning method disclosed by the invention can detect the feeder damage on line under the condition that the communication system does not stop working, does not need to configure a special feeder detection instrument or manually operate, can realize the accurate positioning of the damaged position of the feeder by only utilizing the signal transmitted by the communication system, realizes the on-line and timely maintenance of the communication system, and saves the labor cost.)

1. An on-line automatic positioning method for feeder damage of a short wave communication system is characterized by comprising the following steps:

step 1, acquiring a forward coupling signal and a reverse coupling signal on line through a directional coupler:

collecting forward coupling signal s (t) from receiving transmitter to feeder_positiveReverse coupling signal s (t) from feeder to transmitter_negative；

Step 2, analyzing the center frequency of the forward coupling signal and the reverse coupling signal:

respectively calculate s (t)_positiveAnd s (t)_negativeWhen three groups s (t) are collected_positiveAnd s (t)_negativeCentral frequency f of₁,f₂,f₃If the conditions are not equal to each other, carrying out the next analysis;

step 3, calculating each frequency f_i1,2,3, the phase difference between the backward coupled signal and the forward coupled signal:

received 3 frequencies f₁,f₂,f₃The corresponding forward coupled signal isThe reverse coupled signal is

Calculating each frequency f_iThe phase difference between the backward coupled signal and the forward coupled signal:

step 4, establishing an equation set according to the phase difference, and solving the frequency f₁Corresponding cycle difference between the backward coupled signal and the forward coupled signal

According toValue of (a) and (f)_iFrequency value of (d), calculating frequency f₁Corresponding cycle difference between the backward coupled signal and the forward coupled signalIs a positive integer satisfying the following formula:

whereinf_sThe sampling rate of the signal acquisition equipment;

step 5, calculating the effective feeder line length L_effectiveAnd completing the positioning of the damaged position:

wherein V_RPVThe relative propagation speed of the feeder line is determined by the parameters of the feeder line, and the value range is as follows: v_RPV∈[0.65～0.85]；

And after the effective feeder line length is obtained, the tail end of the effective feeder line length is the damaged position, so that the damaged position is positioned.

Technical Field

The invention belongs to the field of short-wave communication antennas, and particularly relates to an on-line automatic positioning method for feeder damage of a short-wave communication system in the field.

Background

The short-wave communication frequency band is 2-30 MHz, the wavelength is 10-150 meters, and the short-wave communication wavelength is longer, so that the size of the short-wave antenna is larger, the erection site is wider, and the length of a common feeder line can reach dozens of meters to hundreds of meters. When the feeder is installed or after the feeder is installed, the feeder is damaged under the influence of various factors such as machinery, chemistry, natural environment and the like, so how to find the damage of the feeder in time and quickly locate the damaged position of the feeder is very important for maintaining the whole communication system. The conventional method needs manual detection by using devices such as a feeder detector and the like, is very troublesome and cannot find problems in time.

Disclosure of Invention

The invention aims to solve the technical problem of providing an on-line automatic positioning method for short-wave communication system feeder line damage, which can quickly, simply and conveniently find the short-wave communication system feeder line damage on line and position the damaged position.

The invention adopts the following technical scheme:

the improvement of an on-line automatic positioning method for feeder damage of a short wave communication system is characterized by comprising the following steps:

step 1, acquiring a forward coupling signal and a reverse coupling signal on line through a directional coupler:

collecting forward coupling signal s (t) from receiving transmitter to feeder_positiveReverse coupling signal s (t) from feeder to transmitter_negative；

Step 2, analyzing the center frequency of the forward coupling signal and the reverse coupling signal:

respectively calculate s (t)_positiveAnd s (t)_negativeWhen three groups s (t) are collected_positiveAnd s (t)_negativeCentral frequency f of₁,f₂,f₃Satisfy each otherWhen the values are unequal, carrying out next analysis;

step 3, calculating each frequency f_i1,2,3, the phase difference between the backward coupled signal and the forward coupled signal:

received 3 frequencies f₁,f₂,f₃The corresponding forward coupled signal isThe reverse coupled signal is

Calculating each frequency f_iThe phase difference between the backward coupled signal and the forward coupled signal:

step 4, establishing an equation set according to the phase difference, and solving the frequency f₁Corresponding cycle difference between the backward coupled signal and the forward coupled signal

According toValue of (a) and (f)_iFrequency value of (d), calculating frequency f₁Corresponding cycle difference between the backward coupled signal and the forward coupled signalIs a positive integer satisfying the following formula:

whereinf_sFor sampling by signal-collecting apparatusRate;

step 5, calculating the effective feeder line length L_effectiveAnd completing the positioning of the damaged position:

wherein V_RPVThe relative propagation speed of the feeder line is determined by the parameters of the feeder line, and the value range is as follows: v_RPV∈[0.65～0.85]；

And after the effective feeder line length is obtained, the tail end of the effective feeder line length is the damaged position, so that the damaged position is positioned.

The invention has the beneficial effects that:

the positioning method disclosed by the invention can detect the feeder damage on line under the condition that the communication system does not stop working, does not need to configure a special feeder detection instrument or manually operate, can realize the accurate positioning of the damaged position of the feeder by only utilizing the signal transmitted by the communication system, realizes the on-line and timely maintenance of the communication system, and saves the labor cost.

Drawings

Fig. 1 is a schematic flow chart of the positioning method of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Embodiment 1, this embodiment discloses an online automatic positioning method for feeder damage in a short-wave communication system, which can accurately position a damaged position of a feeder by using a signal transmitted by the communication system itself. Assuming that the feeder damage position is 50 meters, the three frequencies transmitted by the transmitter are 4.85MHz, 7.96MHz and 11.38MHz respectively. As shown in fig. 1, the location of the feeder line damage location is accomplished by:

step 1, acquiring a forward coupling signal and a reverse coupling signal on line through a directional coupler:

collecting forward coupling signal s (t) from receiving transmitter to feeder_positiveReverse coupling signal s (t) from feeder to transmitter_negative；

Step 2, analyzing the center frequency of the forward coupling signal and the reverse coupling signal:

respectively calculate s (t)_positiveAnd s (t)_negativeThe center frequency of (a), three groups of collected s (t)_positiveAnd s (t)_negativeThe center frequencies of (a) are: f. of₁＝4.85MHz,f₂＝7.96MHz,f₃＝11.38MHz。f₁,f₂,f₃The requirements are different from each other, and the next analysis can be carried out;

step 3, calculating each frequency f_i1,2,3, the phase difference between the backward coupled signal and the forward coupled signal:

received 3 frequencies f₁,f₂,f₃The corresponding forward coupled signal isThe reverse coupled signal is

Calculating each frequency f_iThe phase difference between the backward coupled signal and the forward coupled signal:

to obtain:

step 4, establishing an equation set according to the phase difference, and solving the frequency f₁Corresponding cycle difference between the backward coupled signal and the forward coupled signal

Mixing the aboveValue of (a) and (f)_iSubstituting the frequency value into the following formula to establish an equation set and calculating the frequency f₁Corresponding cycle difference between the backward coupled signal and the forward coupled signalIs a positive integer satisfying the following formula:

whereinf_sFor the sampling rate of the signal acquisition device, f in this embodiment_s＝92.316MHz，δ＝6.49；

Has a solution value of

Step 5, calculating the effective feeder line length L_effectiveAnd completing the positioning of the damaged position:

wherein V_RPVThe relative propagation speed of the feeder line is determined by the parameters of the feeder line, and the value range is as follows: v_RPV∈[0.65～0.85]；

And after the effective feeder line length is obtained, the tail end of the effective feeder line length is the damaged position, so that the damaged position is positioned. In this embodiment, V_RPVWhen the ratio is 0.75, L is obtained_effective51.1 meters with an error of 1.1 meters.