CN107104690A - A kind of microwave receiver and its multiple antennas switched diversity method of reseptance - Google Patents
A kind of microwave receiver and its multiple antennas switched diversity method of reseptance Download PDFInfo
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- CN107104690A CN107104690A CN201710232754.3A CN201710232754A CN107104690A CN 107104690 A CN107104690 A CN 107104690A CN 201710232754 A CN201710232754 A CN 201710232754A CN 107104690 A CN107104690 A CN 107104690A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
Abstract
The invention discloses a kind of microwave receiver and its multiple antennas switched diversity method of reseptance, it is related to UAV Communication field, this method includes：Control n-th of reception antenna in the N number of reception antenna of one end connection of the antenna switch circuit in microwave receiver, the initial value that n is positive integer and n is 1, pass through n-th of reception antenna received data packet, and calculate continual data package dropout number when passing through n-th of reception antenna received data packet, whether detection continual data package dropout number reaches number of dropped packets threshold value, if continual data package dropout number reaches number of dropped packets threshold value, then make n=n+1, and re-execute the step of one end of control antenna switch circuit connects n-th of reception antenna in N number of reception antenna, the invention is used as switching condition by the way that continual data package dropout number and default number of dropped packets threshold value are compared, logic is simple, extra hardware module need not be increased, while the multipath fading during reducing Multipath Transmission and distortion, reduce system power dissipation and hardware size.
Description
Technical field
The present invention relates to UAV Communication field, especially a kind of microwave receiver and its multiple antennas switched diversity recipient
Method.
Background technology
In microwave communication, communication quality and reliability are affected by various factors, and spread spectrum is (mainly including direct sequence
Row spread spectrum, frequency hopping and other derivative spread spectrums) development substantially increase the antijamming capability of communication system, but multipath
Multipath fading phenomenon, is a kind of adverse effect that can not be eliminated in microwave telecommunication system, is declined to improve multipath caused by transmission
The stability and reliability of transmission are fallen, diversity technique is a kind of conventional anti-fading technology.
Conventional diversity technique is selection diversity at present, and selection diversity needs multiple receiver branch roads, by continuous
Ground does logic selection between the output signal of each receiver branch road based on threshold judgement, preferentially exports a best output
Signal is as final output, but this diversity technique is applied while communication quality and reliability is improved, and can also increase hard
Scale, cost and the power consumption of part circuit design, when the diversity technique is applied to unmanned plane field, can have a strong impact on unmanned plane
Integrated level and airborne equipment weight, so as to influence the endurance and thrust-weight ratio of unmanned plane.
The content of the invention
The present inventor is regarding to the issue above and technical need, it is proposed that a kind of microwave receiver and its multiple antennas switched diversity
Method of reseptance.System work(can be reduced using this method while the multipath fading during reducing Multipath Transmission and distortion
Consumption and hardware size.
Technical scheme is as follows：
A kind of microwave receiver, the microwave receiver includes：N number of reception antenna, antenna switch circuit, radio circuit and micro-
Control unit MCU；One end of antenna switch circuit connects one of reception antenna of N number of reception antenna, antenna switch circuit
The other end connect the input of radio circuit, the output end of radio circuit connects MCU input, MCU control end connection
Antenna switch circuit, N is positive integer and N >=2.
A kind of multiple antennas switched diversity method of reseptance of microwave receiver, this method is applied in above-mentioned microwave receiver,
This method includes：Control one end of antenna switch circuit to connect n-th of reception antenna in N number of reception antenna, n be positive integer and
N initial value is 1；By n-th of reception antenna received data packet, and when calculating by n-th of reception antenna received data packet
Continual data package dropout number；Whether detection continual data package dropout number reaches number of dropped packets threshold value；If continual data package dropout number reaches number of dropped packets threshold value, make
N=n+1, and re-execute the step that one end of control antenna switch circuit connects n-th of reception antenna in N number of reception antenna
Suddenly.
Its further technical scheme is, by n-th of reception antenna received data packet, and calculates by n-th of reception
Continual data package dropout number during antenna received data packet, including：Continual data package dropout number K is reset, makes K=0；Pass through n-th of reception
Antenna receives i-th of packet, and whether i-th packet of detection is abnormal data bag, and the initial value that i is positive integer and i is 1；
If i-th of packet is abnormal data bag, abandons i-th of packet and make K=K+1；If i-th of packet is normal data
Bag, then reset to continual data package dropout number K, make K=0.
Its further technical scheme is, each packet includes at least three fields, i-th of packet of detection whether be
Abnormal data bag, including：Receive each field in i-th of packet successively by n-th of reception antenna, detection is current to be received
To the form of field whether be correct format；If the form for the field being currently received is error format, it is determined that i-th of number
It is abnormal data bag according to bag；If the form for the field being currently received is correct format and the field that is currently received is not last
One field, then continue to next field and whether the form for the field that perform detection is currently received is correct lattice again
The step of formula；If the form for the field being currently received is correct format and the field that is currently received is last field,
It is normal data packet then to determine i-th of packet.
Its further technical scheme is that this method also includes：If continual data package dropout number is not up to number of dropped packets threshold value, i is made
=i+1, and re-execute the step of i-th of packet is received by n-th of reception antenna.
Its further technical scheme is, if continual data package dropout number reaches number of dropped packets threshold value, makes n=n+1, and re-execute
The step of one end of antenna switch circuit connects n-th of reception antenna in N number of reception antenna is controlled, including：If continual data package dropout
Number reaches number of dropped packets threshold value, then detects whether to meet n ＜ N；If n ＜ N, n=n+1 is made, and re-execute control duplexer
The step of one end of circuit connects n-th of reception antenna in N number of reception antenna；If n=N, n=1 is made, and re-execute control
The step of one end of antenna switch circuit processed connects n-th of reception antenna in N number of reception antenna.
The method have the benefit that：
Microwave receiver and its multiple antennas switched diversity method of reseptance proposed by the present invention, by by continual data package dropout number and in advance
If number of dropped packets threshold value be compared as switching condition, logic is simple, is that can be achieved by software, it is not necessary to which increase is extra
Hardware module, reduces hardware size and cost, compared with selection diversity conventional at present, is more easy to realize, in reduction multipath
While multipath fading in transmitting procedure and distortion, system power dissipation and hardware size are reduced.When the microwave receiver and its
Multiple antennas switched diversity method of reseptance is applied to unmanned plane field, when being particularly applied to small-sized consumer level unmanned plane field,
Realization for unmanned plane loss of weight target has greatly improved, so as to improve the endurance and thrust-weight ratio of unmanned plane.
Brief description of the drawings
Fig. 1 is the structural representation of microwave receiver.
Fig. 2 is the flow chart of the multiple antennas switched diversity method of reseptance of microwave receiver.
Fig. 3 is the flow chart of the multiple antennas switched diversity method of reseptance of microwave receiver.
Fig. 4 is the form schematic diagram of packet.
Fig. 5 is the schematic flow sheet of the multiple antennas switched diversity method of reseptance of microwave receiver.
Embodiment
The embodiment to the present invention is described further below in conjunction with the accompanying drawings.
As shown in figure 1, it illustrates a kind of structural representation of microwave receiver disclosed by the invention, the microwave receiver
It is generally used in unmanned plane, the microwave receiver includes：N number of reception antenna, antenna switch circuit, radio circuit and MCU
(Microcontroller Unit, micro-control unit), wherein radio circuit be usually a radio frequency chip, for receiving
The processing such as radiofrequency signal is de-spread, demodulated, packet reduction, MCU is used to enter the radiofrequency signal treated through radio circuit
Row decoding output.One end of antenna switch circuit connects one of reception antenna of N number of reception antenna, antenna switch circuit
The other end connects the input of radio circuit, and the output end of radio circuit connects MCU input, MCU control end connection day
Wiretap circuit, N is positive integer and N >=2.
As shown in Fig. 2 it illustrates a kind of multiple antennas switched diversity method of reseptance of microwave receiver disclosed by the invention
Flow chart, this method be used for Fig. 1 shown in microwave receiver in, this method comprises the following steps：
Step 201, one end of control antenna switch circuit connects n-th of reception antenna in N number of reception antenna, so that
N-th of reception antenna is turned on radio circuit, and n-th of reception antenna starts to be received according to some cycles etc. as work antenna
Packet.Wherein, n is that positive integer and n initial value are 1, that is, on microwave receiver after electricity, antenna switch circuit acquiescence will
1st reception antenna is used as work antenna.
Step 202, by n-th of reception antenna received data packet, and calculate by n-th of reception antenna received data packet
When continual data package dropout number.The concrete methods of realizing of the step comprises the following steps 301-304, refer to the flow chart shown in Fig. 3：
Step 301, continual data package dropout number K is reset, makes K=0.
Step 302, i-th of packet is received by n-th of reception antenna, whether i-th of packet of detection is abnormal number
According to bag, the initial value that i is positive integer and i is 1.
Each packet includes at least three fields, specifically, each packet at least includes synchronization character (Sync
Word), valid data field (Data field) and check code, check code can be CRC (Cyclic Redundancy
Check, CRC) code.Optionally, lead code (Preamble bits), length code are also included in each packet
At least zero kind in (Length field) and address code (Address field).Using packet include above-mentioned 6 fields as
Example, the form of packet can with as shown in figure 4, according to the transmission sequence of field be followed successively by lead code, synchronization character, length code,
Location code, valid data field and check code.Wherein, preamble portion is one section of custom list being made up of 1 and 0, and it is occupied
Byte length support freely program；Synchronization character is used for data packet byte synchronization and alignment of data；Length code is used to define radio frequency
Portions per receives byte length during data, and its byte length occupied is supported freely to program, and byte length is regular length
Or variable-length；Address code is used for matched data packet address；Valid data field is used to carry the effective information in packet；School
Test code be used for verify the whether correct simultaneously back-checking status information of the data that receive.
When receiving i-th of packet by n-th of reception antenna, really received successively by n-th of reception antenna
Each field in i-th of packet, being gone wrong when receiving any one above-mentioned field may all cause packet to receive
Failure, namely there is the phenomenon of packet loss.Then during received data packet, when receiving a field, system detectio is current
Whether the form of the field received is correct format, and the correct format of each field is set in advance.If current receive
To the form of field be error format, then system determines that i-th of packet is abnormal data bag, i.e., to any one field
When receiving mistake, that is, reception failure is represented, system judges packet loss occur, and packet is abnormal data bag, data invalid；If current
The form of the field received is correct format and the field that is currently received is not last field, then continues to next
The step of whether form for the field that individual field and again perform detection are currently received is correct format, that is, only current
When one fields match is to correct format, it can just continue to and next field is detected；If the word being currently received
The form of section is correct format and the field that is currently received is last field, it is determined that i-th of packet is normal number
According to bag, that is, only when it is correct format to detect each field in packet, just determining to receive successfully, that is to say
Normal data packet.
Step 303, if i-th of packet is abnormal data bag, abandon i-th of packet and make K=K+1, that is, being
System abandons the packet received and increases the continual data package dropout number of statistics when judging reception failure.
Step 304, if i-th of packet is normal data packet, continual data package dropout number K is reset, makes K=0.Than
Such as, during by the 1st reception antenna received data packet, if continuously receiving 3 abnormal data bags, now continuously lose
Bag number K=3, if the 4th packet received is normal data packet, resets, when the 5th data received to K
Wrap the K=1 rather than 4 determined for abnormal data bag, system.
Step 203, whether detection continual data package dropout number reaches number of dropped packets threshold value (threshold), wherein, number of dropped packets threshold value is
One default value.
Step 204, if continual data package dropout number reaches number of dropped packets threshold value, n=n+1 is made, and re-execute control duplexer
The step of one end of circuit connects n-th of reception antenna in N number of reception antenna, that is, in the continuous of current work antenna
When number of dropped packets reaches number of dropped packets threshold value, next reception antenna is switched to as work antenna, specifically, antenna switch circuit
Switching is the low and high level of the control end on the MCU being connected through to control, and judging that continual data package dropout number reaches in system loses
During bag number threshold value, the level height for controlling MCU control end to be exported, so as to reach the mesh of the switching of control antenna switch circuit
's.
Optionally, when implementing, the step can also be detected when detecting continual data package dropout number and reaching number of dropped packets threshold value
Whether n ＜ N is met, if n ＜ N, make n=n+1；If n=N, n=1 is made；If that is, current work antenna is that n-th connects
Antenna is received, then back switches to the 1st reception antenna as work antenna, realizes cyclic switching effect.
Step 205, if continual data package dropout number is not up to number of dropped packets threshold value, re-execute and received by n-th of reception antenna
The step of packet, specifically, making i=i+1, and re-execute the step that i-th of packet is received by n-th of reception antenna
Suddenly, that is, when the continual data package dropout number of the reception antenna of work at present is not up to number of dropped packets threshold value, being continuing with work at present
Reception antenna receives next packet and restarts out the testing process of a packet.
The operation principle of the multiple antennas switched diversity method of reseptance of microwave receiver disclosed by the invention can be by following
One exemplary example illustrates：On microwave receiver after electricity, acquiescence is using first reception antenna as work antenna, according to one
The data to be received such as fixed cycle, when receiving the normal data packet for meeting form by first reception antenna, according to leading
Code sequence related algorithm initializes antenna changeover program, continual data package dropout on time domain, frequency domain and after emitter sets up synchronized relation
Number statistical variable K resets to 0., will be continuous if the packet received is normal data packet during synchronous receive is kept
Number of dropped packets K resets to 0 again, and carries out subsequent treatment；If the packet received is abnormal data bag, continual data package dropout number K
Plus 1, and K is compared with default number of dropped packets threshold value.Next reception day is switched to if continual data package dropout number threshold value is reached
Line, resets continual data package dropout number K and receives according to packet is proceeded synchronizing cycle and repeat above-mentioned deterministic process；If not up to
Number of dropped packets threshold value, then continue according to packet reception and repetition above-mentioned deterministic process is carried out synchronizing cycle, its schematic flow sheet please
With reference to Fig. 5.
Above-described is only the preferred embodiment of the present invention, and the invention is not restricted to above example.It is appreciated that this
Other improvement and become that art personnel directly export or associated without departing from the spirit and concept in the present invention
Change, be considered as being included within protection scope of the present invention.
Claims (6)
1. a kind of microwave receiver, it is characterised in that the microwave receiver includes：N number of reception antenna, antenna switch circuit,
Radio circuit and micro-control unit MCU；One of them of one end connection N number of reception antenna of the antenna switch circuit connects
Antenna is received, the other end of the antenna switch circuit connects the input of the radio circuit, the output end of the radio circuit
The input of the MCU is connected, the control end of the MCU connects the antenna switch circuit, and N is positive integer and N >=2.
2. the multiple antennas switched diversity method of reseptance of a kind of microwave receiver, it is characterised in that methods described is used for claim 1
In described microwave receiver, methods described includes：
N-th of reception antenna in one end connection N number of reception antenna of the antenna switch circuit is controlled, n is positive integer
And n initial value is 1；
By n-th of reception antenna received data packet, and calculate when passing through n-th of reception antenna received data packet
Continual data package dropout number；
Detect whether the continual data package dropout number reaches number of dropped packets threshold value；
If the continual data package dropout number reaches the number of dropped packets threshold value, n=n+1 is made, and re-execute the control antenna
The step of one end of on-off circuit connects n-th of reception antenna in N number of reception antenna.
3. method according to claim 2, it is characterised in that described by n-th of reception antenna received data packet,
And continual data package dropout number when passing through n-th of reception antenna received data packet is calculated, including：
Continual data package dropout number K is reset, makes K=0；
I-th of packet is received by n-th of reception antenna, detects whether i-th of packet is abnormal data bag,
The initial value that i is positive integer and i is 1；
If i-th of packet is abnormal data bag, abandons i-th of packet and make K=K+1；
If i-th of packet is normal data packet, continual data package dropout number K is reset, makes K=0.
4. method according to claim 3, it is characterised in that each packet includes at least three fields, the detection
Whether i-th of packet is abnormal data bag, including：
Each field in i-th of packet is received by n-th of reception antenna successively, what detection was currently received
Whether the form of field is correct format；
If the form for the field being currently received is error format, it is determined that i-th of packet is abnormal data bag；
If the form for the field being currently received is correct format and the field that is currently received is not last field, after
Continued access receives next field and re-executes the step of whether form of the field for detecting and being currently received is correct format；
If the form for the field being currently received is correct format and the field that is currently received is last field, it is determined that
I-th of packet is normal data packet.
5. the method according to claim 3 or 4, it is characterised in that methods described also includes：
If the continual data package dropout number is not up to the number of dropped packets threshold value, i=i+1 is made, and re-execute described by described n-th
The step of individual reception antenna receives i-th of packet.
6. according to any described method of claim 2 to 4, it is characterised in that if the continual data package dropout number reach it is described
Number of dropped packets threshold value, then make n=n+1, and re-execute one end connection of the control antenna switch circuit N number of reception
The step of n-th of reception antenna in antenna, including：
If the continual data package dropout number reaches the number of dropped packets threshold value, detect whether to meet n ＜ N；
If n ＜ N, n=n+1 is made, and re-execute one end connection of the control antenna switch circuit N number of reception
The step of n-th of reception antenna in antenna；
If n=N, n=1 is made, and re-execute one end connection N number of reception day of the control antenna switch circuit
The step of n-th of reception antenna in line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710232754.3A CN107104690A (en) | 2017-04-11 | 2017-04-11 | A kind of microwave receiver and its multiple antennas switched diversity method of reseptance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710232754.3A CN107104690A (en) | 2017-04-11 | 2017-04-11 | A kind of microwave receiver and its multiple antennas switched diversity method of reseptance |
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| CN107104690A true CN107104690A (en) | 2017-08-29 |
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ID=59675781
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710232754.3A Pending CN107104690A (en) | 2017-04-11 | 2017-04-11 | A kind of microwave receiver and its multiple antennas switched diversity method of reseptance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683942A (en) * | 2018-08-03 | 2018-10-19 | 成都睿博思科技有限公司 | A kind of UAV Video transmission reception device |
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| CN103379360A (en) * | 2012-04-23 | 2013-10-30 | 华为技术有限公司 | Assessment method and device for video quality |
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| CN1516355A (en) * | 2003-01-08 | 2004-07-28 | 上海神剑铁路通信信号有限公司 | Method and system for overcoming microwave digital transmission receiving blind point due to multipath interference |
| CN1777126A (en) * | 2005-12-12 | 2006-05-24 | 史文勇 | System and method for conducting comprehensive measurement and association analysis to time delay and drop |
| CN103379360A (en) * | 2012-04-23 | 2013-10-30 | 华为技术有限公司 | Assessment method and device for video quality |
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