CN103926635A - Method for monitoring rain area distribution by utilization of microwave link network - Google Patents

Abstract

The invention provides a method for monitoring rain area distribution by the utilization of a microwave link network. The method includes the steps that a microwave link network topology structure is firstly established; according to the established network topology structure, whether rainfall exists on a microwave monitoring link or not is judged; then according to a judged result, the static state rain area distribution is obtained; finally, according to the sequence of time, rain area motion trails are generated. The method can effectively monitor the rain area distribution in real time, and rain area distribution conditions are convenient to master for a monitoring department in real time.

Description

A kind of method of utilizing microwave link network monitor rain belt to distribute

Technical field

The invention provides a kind of method that rain belt distributes of monitoring, especially a kind of microwave link network that utilizes is to the rain belt method of monitoring that distributes.

Background technology

Rainfall is the important meteorologic factor that affects the various action such as physical environment, social life, agricultural production, communications and transportation and takeoff and landing, MISSILE LAUNCHING, the spatial and temporal distributions of rainfall extremely often causes the disasteies such as flood, landslide, rubble flow, city waterlogging, brings serious personnel and economic loss to China.

Although, the widespread uses of rainfall measurement means such as rain gage, weather radar, satellite remote sensing, there is very complicated change in time and space in region in city/mountain area etc. in rainfall.Rain gage measuring accuracy is higher, but needs personnel's periodic maintenance and correction, website skewness, and spatial resolution is lower, even in the relatively intensive area of the websites such as city, is still difficult to monitor the meticulous variation of precipitation.Although weather radar can be estimated large-scale rainfall field distribution, under the condition of the high elevation angle, can only measure part precipitation body or cloud body, under the condition of the low elevation angle, affected by background return, thereby limited at the measurement effect in city and mountain area.Survey rain satellite and can only measure cloud top from top to bottom or penetrate cloud top, and drop between near actual precipitation earth's surface and have bigger difference, be difficult to according to echo inverting rainfall distribution accurately.

Weather radar and survey rain satellite are subject to the restriction of measuring principle and scan mode, the electromagnetic wave signal of launching is often difficult to directly act on completely with near the precipitation particles dropping to earth's surface, becomes the main cause that restricted area precipitation measurement effect further improves.But near the measurement of actual rainfall amount earth's surface, rain belt distribute, rain belt movement locus for precipitation forecast, prevent and reduce natural disasters very important.At present, also lack the effectively measurement means for actual quantity of precipitation near the ground and rain belt DYNAMIC DISTRIBUTION situation.

Summary of the invention

The method that the object of the present invention is to provide a kind of effective monitoring rain belt to distribute, distribution situation that can Real-Time Monitoring rain belt.

In order to realize foregoing invention object, the invention provides a kind of method of utilizing microwave link network monitor rain belt to distribute, comprise the steps,

Step 1, sets up microwave link network topology structure, and monitored area is divided into the capable j row of an i net region, the row limit a of each net region _ijwith row limit b _ijrepresent respectively each microwave monitoring link, wherein, i, j=1,2,3 ..., n, n>=3;

Step 2, judges on each microwave monitoring link whether have rainfall, according to average path rainfall depth formula calculate each row limit a _ijcorresponding average path rainfall amount is:

${R_a}_{\mathrm{ij}}=\sqrt[\mathrm{\α}]{\frac{{W_a}_{\mathrm{ij}}}{k\·{d_a}_{\mathrm{ij}}}}$

Calculate each row limit b _ijcorresponding average path rainfall amount is:

${R_b}_{\mathrm{ij}}=\sqrt[\mathrm{\α}]{\frac{{W_b}_{\mathrm{ij}}}{k\·{d_b}_{\mathrm{ij}}}}$

Wherein, with be respectively the length on the He Lie limit, row limit of microwave monitoring link, with be respectively row limit a _ijwith row limit b _ijthe rain attenuation of corresponding microwave monitoring link, k and α are number rule parameter, by microwave frequency, raindrop size or the raindrop temperature value of tabling look-up, if the row limit a of certain net region _ijcorresponding average path rainfall amount the row limit a of this net region _ijon corresponding microwave monitoring link, there is rainfall, if the row limit b of certain net region _ijcorresponding average path rainfall amount the row limit a of this net region _ijon corresponding microwave monitoring link, there is rainfall;

Step 3, obtains rain belt and distributes, and each net region is divided into four grids that area is equal, if will with row limit a _ijadjacent grid is designated as X _ij, the rainfall amount in each grid is if will with row limit b _ijadjacent grid is designated as Y _ij, the rainfall amount in each grid is if X _ijwith Y _ijhave coincidence grid, the rainfall amount of the grid that overlaps is all grids that have rainfall amount form rain belt distribution jointly.

Adopt the rain of the microwave link characteristic that declines to monitor on each microwave link, whether there is rainfall, and calculate the rainfall amount of the grid that each microwave link is adjacent, thereby effectively rain belt is distributed and carries out Real-Time Monitoring.

Scheme as a further improvement on the present invention, also comprises,

Step 4, generate rain belt movement locus, repeat to judge at interval of a period of time each microwave monitors on link whether have rainfall, and again obtain rain belt distribution, again all historical rain belts are distributed to reproduction on corresponding net region, thereby obtain the movement locus of rain belt.

Employing is again obtained rain belt at interval of a period of time and is distributed, and all historical rain belts are distributed to reproduction on corresponding net region, thus the movement locus of acquisition rain belt.

As further restriction scheme of the present invention, net region is square area.Adopt square area to divide monitored area, more easily rain belt is positioned to analysis than rectangular region or irregularly shaped region.

As further restriction scheme of the present invention, when monitored area is rain belt, urban district, n=4.In the time that monitored area is rain belt, urban district, n can be set as to 4, be divided into 3 row 3 row 9 net regions that area is identical altogether by monitored area, if urban size is larger, n can be set as to larger value.

As further restriction scheme of the present invention, when monitored area is rain belt, urban district, with all be made as 5km.In the time that monitored area is rain belt, urban district, can be by with all be made as 5km, can meet the monitoring requirement of microwave link completely.

Beneficial effect of the present invention is: (1) adopts the rain of the microwave link characteristic that declines to monitor on each microwave link, whether there is rainfall, and calculates the rainfall amount of the grid that each microwave link is adjacent, thereby effectively rain belt is distributed and carries out Real-Time Monitoring; (2) employing is obtained rain belt distribution again at interval of a period of time, and all historical rain belts are distributed to reproduction on corresponding net region, thus the movement locus of acquisition rain belt.

Brief description of the drawings

Fig. 1 is method flow diagram of the present invention;

Fig. 2 is that schematic diagram is divided in monitored area of the present invention;

Fig. 3 a is rain belt, row of the present invention limit distribution schematic diagram;

Fig. 3 b is rain belt, row of the present invention limit distribution schematic diagram;

Fig. 3 c is coincidence of the present invention rain belt distribution schematic diagram;

Fig. 4 is rain belt of the present invention movement locus schematic diagram.

Embodiment

As shown in Fig. 1,2,3a, 3b, 3c and 4, the method for utilizing microwave link network monitor rain belt to distribute of the present invention, comprises the steps,

Step 1, set up microwave link network topology structure, the Network Topology Design of microwave link is the basis that utilizes microwave link monitoring rain belt DYNAMIC DISTRIBUTION, reasonably network topology has higher monitoring efficiency, monitored area is divided into the capable j row of an i net region by the present invention, the shape of net region can be set as square, is convenient to calculate and divide the row limit a of each net region _ijwith row limit b _ijrepresent respectively each microwave monitoring link, wherein, i, j=1,2,3,, n, n>=3, in the time that monitored area is rain belt, urban district, n can be set as to 4, be divided into 3 row 3 row 9 net regions that area is identical altogether by monitored area, amount to 24 microwave monitoring links, every a pair of transceiver terminal composition of microwave monitoring chain route, the about 5km of linkage length, if urban size is larger, n can be set as to larger value;

Step 2, judge on each microwave monitoring link and whether have rainfall, average path Precipitation measurement of the present invention is based on Rain fade modes, can survey signal type is signal attenuation, for the microwave link that is no more than 55GHz frequency, in the time that the signal transmitting terminal of every microwave link keeps emissive power constant, the incoming level of receiving end tracer signal is also constant, first select to rain front incoming level as reference level, when recycling reference level and rainfall, the difference of incoming level is calculated the signal attenuation that rainfall causes, and according to the suitable coefficient k of Frequency Band Selection and α, again according to average path rainfall depth formula calculate each row limit a _ijcorresponding average path rainfall amount is:

${R_a}_{\mathrm{ij}}=\sqrt[\mathrm{\α}]{\frac{{W_a}_{\mathrm{ij}}}{k\·{d_a}_{\mathrm{ij}}}}$

Calculate each row limit b _ijcorresponding average path rainfall amount is:

${R_b}_{\mathrm{ij}}=\sqrt[\mathrm{\α}]{\frac{{W_b}_{\mathrm{ij}}}{k\·{d_b}_{\mathrm{ij}}}}$

Wherein, with the length that is respectively the He Lie limit, row limit of microwave monitoring link, net region of the present invention is square area, all with equal in length, and with length can adjust as required, with be respectively row limit a _ijwith row limit b _ijthe rain attenuation of corresponding microwave monitoring link, k and α are number rule parameter, by microwave frequency, raindrop size or the raindrop temperature value of tabling look-up, if the row limit a of certain net region _ijcorresponding average path rainfall amount the row limit a of this net region _ijon corresponding microwave monitoring link, there is rainfall, if the row limit b of certain net region _ijcorresponding average path rainfall amount the row limit a of this net region _ijon corresponding microwave monitoring link, there is rainfall;

Step 3, obtains rain belt and distributes, and each net region is divided into four grids that area is equal, as shown in Figure 3 a, if will with row limit a _ijadjacent grid is designated as X _ij, the rainfall amount in each grid is as shown in Figure 3 b, if will with row limit b _ijadjacent grid is designated as Y _ij, the rainfall amount in each grid is as shown in Figure 3 c, if X _ijwith Y _ijhave coincidence grid, the rainfall amount of the grid that overlaps is all grids that have rainfall amount form rain belt distribution jointly.

In order further to obtain the movement locus of rain belt, the present invention also comprises,

Step 4, generate rain belt movement locus, repeat to judge at interval of a period of time each microwave monitors on link whether have rainfall, and again obtain rain belt distribute, again all historical rain belts are distributed to reproduction on corresponding net region, thereby obtain the movement locus of rain belt, as seen from Figure 4, initial time rain belt is distributed in region X ₁₂region, after certain interval of time, rain belt distributes and moves to Y ₃₁region, then after certain interval of time, rain belt distribution moves to X ₂₃region, then after certain interval of time, rain belt distribution moves to Y ₄₂region.

Claims (5)

1. a method of utilizing microwave link network monitor rain belt to distribute, is characterized in that: comprises the steps,

Step 1, sets up microwave link network topology structure, and monitored area is divided into the capable j row of an i net region, the row limit a of each net region _ijwith row limit b _ijrepresent respectively each microwave monitoring link, wherein, i, j=1,2,3 ..., n, n>=1;

Step 2, judges on each microwave monitoring link whether have rainfall, according to average path rainfall depth formula calculate each row limit a _ijcorresponding average path rainfall amount is:

${R_a}_{\mathrm{ij}}=\sqrt[\mathrm{\α}]{\frac{{W_a}_{\mathrm{ij}}}{k\·{d_a}_{\mathrm{ij}}}}$

Calculate each row limit b _ijcorresponding average path rainfall amount is:

${R_b}_{\mathrm{ij}}=\sqrt[\mathrm{\α}]{\frac{{W_b}_{\mathrm{ij}}}{k\·{d_b}_{\mathrm{ij}}}}$

Wherein, with be respectively the length on the He Lie limit, row limit of microwave monitoring link, with be respectively row limit a _ijwith row limit b _ijthe rain attenuation of corresponding microwave monitoring link, k and α are number rule parameter, by microwave frequency, raindrop size or the raindrop temperature value of tabling look-up, if the row limit a of certain net region _ijcorresponding average path rainfall amount the row limit a of this net region _ijon corresponding microwave monitoring link, there is rainfall, if the row limit b of certain net region _ijcorresponding average path rainfall amount the row limit a of this net region _ijon corresponding microwave monitoring link, there is rainfall;

Step 3, obtains rain belt and distributes, and each net region is divided into four grids that area is equal, if will with row limit a _ijadjacent grid is designated as X _ij, the rainfall amount in each grid is if will with row limit b _ijadjacent grid is designated as Y _ij, the rainfall amount in each grid is if X _ijwith Y _ijhave coincidence grid, the rainfall amount of the grid that overlaps is all grids that have rainfall amount form rain belt distribution jointly.

2. the method for utilizing microwave link network monitor rain belt to distribute according to claim 1, it is characterized in that: also comprise, step 4, generate rain belt movement locus, repeat to judge at interval of a period of time each microwave monitors on link whether have rainfall, and again obtain rain belt distribution, more all historical rain belts are distributed to reproduction on corresponding net region, thus obtain the movement locus of rain belt.

3. the method for utilizing microwave link network monitor rain belt to distribute according to claim 1 and 2, is characterized in that: described net region is square area.

4. the method for utilizing microwave link network monitor rain belt to distribute according to claim 1 and 2, is characterized in that: when described monitored area is rain belt, urban district, and n=4.

5. the method for utilizing microwave link network monitor rain belt to distribute according to claim 1 and 2, is characterized in that: when described monitored area is rain belt, urban district, with all be made as 5km.