CN106357354B - A kind of shadow occlusion detection method of satellite mobile communication - Google Patents

A kind of shadow occlusion detection method of satellite mobile communication Download PDF

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CN106357354B
CN106357354B CN201610766287.8A CN201610766287A CN106357354B CN 106357354 B CN106357354 B CN 106357354B CN 201610766287 A CN201610766287 A CN 201610766287A CN 106357354 B CN106357354 B CN 106357354B
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antenna
satellite
timer
carrier
shadow
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CN106357354A (en
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姚敏立
袁丁
张峰干
戴精科
郝路瑶
王梓涵
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Rocket Force University of Engineering of PLA
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Quality & Reliability (AREA)
  • Electromagnetism (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a kind of shadow occlusion detection methods of satellite mobile communication, comprising the following steps: 1) carries out the alignment of communication in moving wave beam and target satellite；2) when unobstructed and alignment, the maximum value M of received signal strength indication is statisticallyd analyze, then the intensity threshold T for receiving signal is setnAnd Tr；It 3) is V in the intensity value that t moment acquires reception signalt；4) work as Vt<TnWhen, then show that target satellite is blocked completely；Otherwise, then step 5) is gone to；5) when the carrier of antenna enters occlusion area, start timer, and antenna is made to stop tracking satellite, keep the direction of antenna current beam；When the carrier of antenna does not enter into shadow occlusion region, then so that antenna is continued tracking satellite and then restart antenna tracking satellite when the carrier of antenna gets over the sadness occlusion area；Work as P3When≤η, then show that the carrier of antenna is in shadow occlusion region；This method can fast and accurately detect whether satellite communication is blocked by shadow.

Description

A kind of shadow occlusion detection method of satellite mobile communication
Technical field
The invention belongs to technical field of satellite communication, are related to a kind of shadow occlusion detection method of satellite mobile communication.
Background technique
In satellite communication in motion, the movement of carrier will lead to the random variation of satellite communication channel environment.Ku wave band Electromagnetic wavelength there was only several centimetres, when target satellite is by obstacles such as the high building in roadside, billboard, the overline bridge of road, culverts When the sight of object is blocked, communication in moving will be unable to receive signal, and satellite communication link can be blocked.Quickly and accurately judgement is dynamic In lead to the state of satellite link and be to ensure that the inevitable requirement of communication in moving reliable communication.
According to antenna for satellite communication in motion beam angle, barrier size and positional relationship between the two, sight, which is blocked, to divide It for partial occlusion and completely blocks, under conditions of partial occlusion, such as electric pole, billboard barrier block, receiver Still part signal can be received, but received signal amplitude is smaller.Since barrier size is smaller, the time is blocked generally very It is short, if bearer rate is quickly, then this influence blocked can be ignored；When barrier size is larger, such as the height beside road Building, culvert etc. can block satellite communication link completely, and communication in moving will be unable to receive useful signal at this time.
In real work, communication in moving also suffers from blocking for roadside tress.The wavelength of Ku frequency range electromagnetic wave and spring, autumn When leaf gap be not much different, therefore narrow leaf gap can be passed through, communication in moving pass through the shapes such as trees in spring, autumn At shadow region when, the characteristics of random fluctuation variation can be presented in the signal strength in receiver, existing deep fading also has gently Degree decline.Its deep fading is caused by leaf, blocking for trunk, slight fades be then due to electromagnetic wave pass through leaf, tree with Caused by gap between tree；If the tree branches in summer roadside are luxuriant, communication in moving satellite link can be blocked completely, be caused Receive the deep fading of signal.
The case where published satellite communication in moving shadow occlusion detection method, is as follows:
1) " control method of mobile satellite tracking antenna system ", (Kyia Motors Co., Ltd., Chinese people's republicanism State's patent of invention, ZL200310118219.3,2005), whether which measures antenna direction by the 360 degree rotation of antenna It is blocked by barrier, but situations such as this method can not judge trees shade, and due to needing to carry out on antenna 360 degree of rotation Turn, primary judgement takes a long time.
2) " signal levelling detecting and dynamic tracking satellite antenna ", (Pang Jiangfan, the People's Republic of China (PRC) use new patent, ZL200420058643.3,2006), which judges that antenna direction is using the derivative of satellite received signal intensity versus time It is no to be blocked by obstructions, but this method can not effectively judge it is intermittent block, such as roadside trees, electric pole.In addition, due to The sensibility of gradient, this method can generate a large amount of false judgement in practical applications, and shortage can practicality.
In conclusion up to the present, not yet find it is a kind of can be to shadow occlusions various types of in satellite mobile communication Carry out method that is quick, accurately detecting.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, the shade for providing a kind of satellite mobile communication is hidden Detection method is kept off, this method can fast and accurately detect whether satellite communication is blocked by shadow.
In order to achieve the above objectives, the shadow occlusion detection method of satellite mobile communication of the present invention includes following step It is rapid:
1) starting up's satellite mobile communication system, the steady operation pattern that starting antenna is directed toward, search and capture target Satellite restarts tracking process, realizes the alignment of communication in moving wave beam and target satellite；
2) when unobstructed and communication in moving wave beam and target satellite alignment, N number of intensity value V=for receiving signal is acquired [V1,V2,…VN], and statistically analyze the maximum value M of received signal strength indication, then the intensity threshold T for receiving signal is setnAnd Tr, wherein TnFor the upper limit value of the intensity of reception signal under complete obstruction conditions, TrTo receive signal under shadow-free obstruction conditions Intensity lower limit value, 0~M is divided into L1Section, L2Section and L3Section, wherein L1=[0, Tn)、L2=[Tn,Tr)、L3 =[Tr, M), the intensity value for receiving signal is calculated in L1Section, L2Section and L3Frequency G in sectioniAnd frequency Pi=Gi/ N, In, i=1,2,3, timer flag Flag is set1=0, Flag2=0；
It 3) is V in the intensity value that t moment acquires reception signalt；
4) start timer, work as Vt<TnWhen, then show that target satellite is blocked completely, judges to detect whether timer reaches Timing, when timer reaches timing, then return step 1), otherwise, stop antenna tracking satellite, and keep current Beam position is constant, returns again to step 3)；Work as Vt≥TnWhen, then go to step 5)；
5) the intensity value V for receiving signal is updated, enables V (n-1) be updated to V (n), wherein n=2,3 ..., N, V (n)=Vt, And update Pi=Gi/N；
6) η is set as received statistic P under the conditions of normal3Lower limit, P is worked as in η > 0.53> η, and the signal that antenna receives Intensity when mutating, then show that the carrier of antenna enters occlusion area, start timer, and so that antenna is stopped tracking and defend Star keeps the direction of antenna current beam, and return step 3)；Work as P3When > η, when the signal strength that antenna receives is not sent out Raw mutation then shows that the carrier of antenna does not enter into or get over the sadness occlusion area, at this time when the carrier of antenna does not enter into Shadow occlusion region then makes antenna continue tracking satellite and then restarts day when the carrier of antenna gets over the sadness occlusion area Line tracking satellite；
Work as P3When≤η, then show that the carrier of antenna is in shadow occlusion region, antenna received signal intensity is not just Normal state, at this point, being then actuated for timer, and return step 3 when without starting timer)；When timer has been started up When, then the starting time of timer is calculated, and judge whether timer reaches timing according to the starting time of timer, when When timer reaches timing, then show antenna recapture to satellite, and return step 1)；When timer does not reach fixed When the time when, then the direction for stopping antenna tracking satellite, and keeping the wave beam of antenna current returns again to step 3).
T=(N+K) Δ t in step 3), wherein Δ t is the update interval of signal strength.
The invention has the following advantages:
The shadow occlusion detection method of satellite mobile communication of the present invention moves traditional satellite when specific operation Link state in dynamic communication is divided into three types, i.e., satellite is blocked completely, antenna does not enter into shadow occlusion region and Antenna comes into shadow occlusion region, to be more in line with real work situation, while the present invention passes through timer to reception signal Intensity using counting in short-term, eliminate and antenna direction be rotated by 360 ° the problem of time-consuming in the past, improve shadow occlusion detection and sentences Disconnected speed, while eliminating the judgement of bring falseness and detection when tradition is judged using the gradient detection of received signal strength and sentencing Break too sensitive problem, improves the accuracy of shadow occlusion detection judgement.
Detailed description of the invention
Fig. 1 is the schematic diagram that Satellite mobile communication of the present invention is not blocked；
Fig. 2 is the schematic diagram that Satellite mobile communication of the present invention is blocked completely by large scale barrier；
Fig. 3 is the principle of the present invention figure；
Fig. 4 is flow chart of the invention；
Fig. 5 is the one received schematic diagram of Satellite signal of embodiment；
Fig. 6 be embodiment one in it is unobstructed under the conditions of received satellite signal strength variation diagram；
Fig. 7 is received signal strength variation diagram when target satellite is blocked by electric pole and overline bridge in embodiment one；
Fig. 8 is received signal strength variation diagram when target satellite is by trees shadow occlusion in embodiment one；
Fig. 9 is the schematic diagram of algorithm judgement when one Satellite mobile communication of embodiment is blocked by large scale barrier；
Figure 10 is the schematic diagram that one Satellite mobile communication of embodiment is judged by algorithm when trees shadow occlusion；
Figure 11 is the schematic diagram that one Satellite mobile communication of embodiment is judged by algorithm when trees shadow occlusion.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
With reference to Fig. 1, detection method includes the following steps for the shadow occlusion of satellite mobile communication of the present invention:
1) starting up's satellite mobile communication system, the steady operation pattern that starting antenna is directed toward, search and capture target Satellite restarts tracking process, realizes the alignment of communication in moving wave beam and target satellite；
2) when unobstructed and communication in moving wave beam and target satellite alignment, N number of intensity value V=for receiving signal is acquired [V1,V2,…VN], and statistically analyze the maximum value M of received signal strength indication, then the intensity threshold T for receiving signal is setnAnd Tr, wherein TnFor the upper limit value of the intensity of reception signal under complete obstruction conditions, TrTo receive signal under shadow-free obstruction conditions Intensity lower limit value, 0~M is divided into L1Section, L2Section and L3Section, wherein L1=[0, Tn)、L2=[Tn,Tr)、L3 =[Tr, M), the intensity value for receiving signal is calculated in L1Section, L2Section and L3Frequency G in sectioniAnd frequency Pi=Gi/ N, In, i=1,2,3, timer flag Flag is set1=0, Flag2=0；
It 3) is V in the intensity value that t moment acquires reception signalt, t=(N+K) Δ t, wherein Δ t be signal strength more New frequency；
4) start timer, work as Vt<TnWhen, then show that target satellite is blocked completely, judges to detect whether timer reaches Timing, when timer reaches timing, then return step 1), otherwise, stop antenna tracking satellite, and keep current Beam position is constant, returns again to step 3)；Work as Vt≥TnWhen, then go to step 5)；
5) the intensity value V for receiving signal is updated, enables V (n-1) be updated to V (n), wherein n=2,3 ..., N, V (n)=Vt, And update Pi=Gi/N；
6) η is set as received statistic P under the conditions of normal3Lower limit, P is worked as in η > 0.53> η, and the signal that antenna receives Intensity when mutating, then show that the carrier of antenna enters occlusion area, start timer, and so that antenna is stopped tracking and defend Star keeps the direction of antenna current beam, and return step 3)；Work as P3When > η, when the signal strength that antenna receives is not sent out Raw mutation then shows that the carrier of antenna does not enter into or get over the sadness occlusion area, at this time when the carrier of antenna does not enter into Shadow occlusion region then makes antenna continue tracking satellite and then restarts day when the carrier of antenna gets over the sadness occlusion area Line tracking satellite；
Work as P3When≤η, then show that the carrier of antenna is in shadow occlusion region, antenna received signal intensity is not just Normal state, at this point, being then actuated for timer, and return step 3 when without starting timer)；When timer has been started up When, then the starting time of timer is calculated, and judge whether timer reaches timing according to the starting time of timer, when When timer reaches timing, then show antenna recapture to satellite, and return step 1)；When timer does not reach fixed When the time when, then the direction for stopping antenna tracking satellite, and keeping the wave beam of antenna current returns again to step 3).
It should be noted that
(1) carrier is largely in L in open area, collected N number of signal strength indication3In interval range, G3It is approximately equal to N, mainly in step 3, step 5, step 6 circulation, the stabilization and tracking process of satellite mobile communication are worked normally, are denoted as program State 3.
(2) target satellite is blocked completely, and the time T blocked is less than the time T for keeping thresholdingthreshold, program master It to be recycled in step 3, step 4, the intensity for receiving signal is substantially zeroed, and system tracking process stops working, and is denoted as state 2.
(3) carrier enters trees shade or in short-term occlusion area, and TT&C system keeps beam position alignment target satellite, journey Mainly in step 3, step 5, step 6 circulation, system tracking process stops working sequence, is denoted as state 1.
(4) carrier is in complete occlusion area and duration T is greater than the time T for keeping thresholdingthreshold, program will Return step 1 captures target satellite again, is denoted as state 0.
Embodiment one
Asia is received using 0.6m reflecting surface satellite antenna for satellite communication in motion at Xi'an region (latitude 34.16N, longitude 108.54E) Too 3S satellite (105.5 ° of E of longitude), using beacon receiver monitoring received signal strength variation, as shown in Fig. 5.
1, the signature analysis of received signal strength
According to the situation of change of the received signal strength measured before test, following 3 sections: L are divided1=[0,0.5), L2 =[0.5,3), L3=[3 ,+∞).
(1) in open area, the intensity (as shown in Fig. 6) that communication in moving receives signal is mainly trembled in 4.05 ± 0.2V Dynamic, signal strength is big, and variation is small, at this point, P3=1, P1=P2=0, all signal strengths are all in L3In section；
(2) it is travelled on the highway that live wire bar and overline bridge block, Vehicle Speed is greater than 30km/h, and communication in moving receives Change in signal strength is as shown in Fig. 7.
It is for statistical analysis to the intensity value of the reception signal of t=1~41s (live wire bar blocks on the way), P can be obtained1=P2 =0, P3=1, frequency disribution when frequency disribution and antenna of the signal strength in each section are in open area is essentially identical, tests The small sizes barrier such as electric pole blocks docking receipts effect of signals very little when having demonstrate,proved carrier fast running.
It is for statistical analysis to the intensity value of the reception signal of t=42~48s (overline bridge occlusion area), P can be obtained1= 0.8361, P2=0.0164, P3=0.1475, when showing to be blocked by large scale barrier, received signal strength indication has 80% or more In L1The intensity in section, i.e. reception signal is substantially zeroed, and part nonzero value is obtained when having just enter into occlusion area.
During vehicle fast running, the decline very little of signal strength caused by electric pole does not influence substantially；And passing through When overline bridge, the communication link of communication in moving is blocked completely, causes the intensity for receiving signal to be directly reduced to zero, depth has occurred and declines It falls.
(3) received signal strength variation is as shown in Fig. 8 when vehicle passes through trees shadow region.
It is for statistical analysis to the intensity value of the reception signal of t=65~115s (under trees shade), P can be obtained1= 0.1158, P2=0.3533, P3=0.5309 compares with first two situation, and trees shade leads to point for the intensity for receiving signal Cloth more disperses, and the intensity for receiving signal had both contained deep fading with slight fades.
2, judge shadow occlusion
The working condition of satellite mobile communication system uses 0,1,2,3 four digital representation respectively: " state 0 " is to need to catch again It obtains and tracks；" state 1 " is the state for stopping tracking process due to entering shadow region, current beam being kept to be directed toward；" state 2 " For the state for stopping tracking process due to entering occlusion area, current beam being kept to be directed toward, " state 3 " is normal communication state.
(1) the length N=50 of statistical data, shadowing threshold parameter value η=0.9, then detection threshold parameter value are set Delta=12 sets timer duration as T to examine performance of the inventionthreshold=4s blocks large scale barrier Judging result is as shown in Fig. 9, and the present invention can enter to carrier or leave the time accurate judgement of occlusion area, when blocking Between be more than setting thresholding TthresholdWhen, system mode is changed into state 0 by state 2 (stopping tracking, remain pointing to) and (needs It captures again).
(2) set the length N=50 of statistical data, shade judges threshold parameter value η=0.9, set timer duration as Tthreshold=20s, is respectively set delta=15 and delta=8, to the judging result such as attached drawing 10, attached drawing 11 of trees shade It is shown.
It can be seen from attached drawing 10, attached drawing 11 present invention can accurate judgement carrier enter time of shadow region, but it is right Carrier leave shade judgement there are the lag of short time, the lag of this judgement that shadow region is left to carrier be by Caused by delta, and it is inevitable, if reducing delta, the short intervals in trees shade are likely to result in the erroneous judgement of algorithm, As the state in attached drawing 11 between t=90~95s changes；If increasing delta, it will increase and judge that carrier leaves shadow region Lag time, therefore the two needs be balanced, if the interval of trees is larger, can by increase delta, with reduce miss The probability sentenced；If the interval of trees is smaller, when can leave the lag of shadow region by reducing delta to reduce judgement Between.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention In the protection scope of art scheme.

Claims (2)

1. a kind of shadow occlusion detection method of satellite mobile communication, which comprises the following steps:
1) starting up's satellite mobile communication system, the steady operation pattern that starting antenna is directed toward, search and capture target satellite, Restart tracking process, realizes the alignment of communication in moving wave beam and target satellite；
2) when unobstructed and communication in moving wave beam and target satellite alignment, N number of intensity value V=[V for receiving signal is acquired1, V2,…VN], and statistically analyze the maximum value M of received signal strength indication, then the intensity threshold T for receiving signal is setnAnd Tr, In, TnFor the upper limit value of the intensity of reception signal under complete obstruction conditions, TrFor the intensity for receiving signal under shadow-free obstruction conditions Lower limit value, 0~M is divided into L1Section, L2Section and L3Section, wherein L1=[0, Tn)、L2=[Tn,Tr)、L3=[Tr, M), the intensity value for receiving signal is calculated in L1Section, L2Section and L3Frequency G in sectioniAnd frequency Pi=Gi/ N, wherein i= 1,2,3, timer flag Flag is set1=0, Flag2=0；
It 3) is V in the intensity value that t moment acquires reception signalt；
4) start timer, work as Vt<TnWhen, then show that target satellite is blocked completely, judges to detect whether timer reaches timing Time, when timer reaches timing, then return step 1), otherwise, stop antenna tracking satellite, and keep current beam It is directed toward constant, returns again to step 3)；Work as Vt≥TnWhen, then go to step 5)；
5) the intensity value V for receiving signal is updated, enables V (n-1) be updated to V (n), wherein n=2,3 ..., N, V (n)=Vt, and update Pi=Gi/N；
6) η is set as received statistic P under the conditions of normal3Lower limit, P is worked as in η > 0.53> η, and the signal that receives of antenna is strong When degree mutates, then shows that the carrier of antenna enters occlusion area, start timer, and antenna is made to stop tracking satellite, protect Hold the direction of antenna current beam, and return step 3)；Work as P3When > η, when there is no prominent for the signal strength that antenna receives Become, then shows that the carrier of antenna does not enter into or get over the sadness occlusion area, at this time when the carrier of antenna does not enter into shade Occlusion area, then make antenna continue tracking satellite, when the carrier of antenna gets over the sadness occlusion area, then restart antenna with Track satellite；
Work as P3When≤η, then show that the carrier of antenna is in shadow occlusion region, antenna received signal intensity is not in normal shape State, at this point, being then actuated for timer, and return step 3 when without starting timer)；When timer has been started up, then The starting time of timer is calculated, and judges whether timer reaches timing according to the starting time of timer, when timing When device reaches timing, then show antenna recapture to satellite, and return step 1)；When timer does not reach timing Between when, then the direction for stopping antenna tracking satellite, and keeping the wave beam of antenna current returns again to step 3).
2. the shadow occlusion detection method of satellite mobile communication according to claim 1, which is characterized in that t in step 3) =(N+K) Δ t, wherein Δ t is the renewal frequency of signal strength, and K is positive integer.
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