CN208540073U - A kind of UAV Video transmission reception device - Google Patents
A kind of UAV Video transmission reception device Download PDFInfo
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- CN208540073U CN208540073U CN201821251163.7U CN201821251163U CN208540073U CN 208540073 U CN208540073 U CN 208540073U CN 201821251163 U CN201821251163 U CN 201821251163U CN 208540073 U CN208540073 U CN 208540073U
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Abstract
The utility model relates to technical field of video transmission, disclose a kind of UAV Video transmission reception device.Channel unit is demodulated including receiving, diversity controls machine unit and system control and source coding unit, the reception demodulation channel unit includes that the first reception demodulation channel and second receive demodulation channel, described first receives demodulation channel is made of a whiplike receiving antenna and a reception demodulation front end, described second receives demodulation channel is made of a Yagi spark gap receiving antenna and a reception demodulation front end, reception demodulation front end connection diversity controls machine unit, the diversity control machine unit has signal switching module, signal switching module switching first receive demodulation channel or second receive demodulation channel be signally attached to system control and source coding unit.Using the technical solution of the utility model, the whiplike receiving antenna of right angle setting and it is horizontally mounted Yagi spark gap receiving antenna, is conducive to using selection diversity synthetic method, to improve the signal-to-noise ratio of complete machine.
Description
Technical field
The utility model relates to technical field of video transmission, especially a kind of UAV Video transmits reception device.
Background technique
With the development automatically controlled with artificial intelligence technology, unmanned plane application field is more and more extensive, unmanned plane application
Environment also becomes increasingly complex, and proposes transmission of video distance, resolution ratio and channel capacity than previous higher requirement.With
The skyborne flight of unmanned plane, airborne wireless video transmitter usually work architecture ensemble and various terrain and its features more
In complex environment, when being communicated with land or onboard reception device, due to the decaying of limitation, the propagation of bandwidth,
The time-varying characteristics of channel, noise, interference (mainly common signal channel interference) and multi-path problem, all the above factors are all tight
Restrict the development of unmanned plane wireless video transmission business again.
For unmanned plane in the sky in flight course, external environment can generate following four influences to radio signal propagation: propagate
Path loss, multipath fading, shadow fading and Doppler effect during unmanned plane during flying.Propagation path loss is to pass
The function of distance is broadcast, it is directly proportional to propagation distance.The signal that multipath receives receiver is the multipath of multiple random phases
The superposition of signal, thus the amplitude for receiving signal be equivalent to signal carrier wavelength at one distance range in apparent rise is presented
Volt variation, this phenomenon are referred to as multipath rapid fading.Other than multipath rapid fading, signal strength can also be by big barrier around
Variation and more slowly dipping and heaving, the strong and weak variation of this signal amplitude are referred to as shadow fading.Shadow fading general satisfaction pair
Number normal distribution.Doppler effect is the frequency due to caused by the relative motion between unmanned plane and ground or receiver on-board
Small-scale fluctuation is composed, to cause time selective fading.Doppler effect is by movement speed, relative position and moving direction
It influences.
The fading effect known to analyzing above is one of the principal element for influencing unmanned plane wireless video transmission distance.Wherein
Rapid fading depth up to 30 ~ 40dB.These factors finally make UAV Video transmission range shorten, and video quality is deteriorated,
Vision signal cannot be even received at all.It is influenced to reduce these decline brings, improves received video quality, promoted
The problem of transmission range receives much attention as industry.
Due to the limitation of UAV system heavy load and heat dissipation, conventional raising transmission power, increases antenna ruler at transmitting diversity
The methods of very little and height is come to overcome this deep fade be unpractical.Although receiver uses anti-fading reception technique, effect
It is all unobvious, it is therefore necessary to this problem be solved using more preferably method, need to be updated the prior art and be transformed.
Utility model content
The goal of the invention of the utility model is: in view of the above problems, providing a kind of UAV Video transmission
Reception device.
The technical solution adopted in the utility model is such that a kind of UAV Video transmission reception device, including receives
Channel unit, diversity control machine unit and system control and source coding unit are demodulated, the reception demodulation channel unit includes
First receives demodulation channel and the second reception demodulation channel, and described first receives demodulation channel by a whiplike receiving antenna and one
A reception demodulation front end is constituted, and described second, which receives demodulation channel, demodulates front end structure by a Yagi spark gap receiving antenna and a reception
At reception demodulation front end connection diversity controls machine unit, and the diversity control machine unit has signal switching module, described
The first reception of signal switching module switching demodulates channel or the second reception demodulates being signally attached to system control and believing for channel
Source decoding unit.
Further, reception demodulation front end uses ASIC circuit, specifically includes low noise high linear amplifier, low noise
Acoustic amplifier, RF signal strength detector and AGC Control module, radio frequency tracking filter, frequency mixer, intermediate-frequency filter,
Intermediate-freuqncy signal intensity detector and AGC Control module, variable gain amplifier, voltage controlled oscillator and demodulation module, the whip
Shape receiving antenna or Yagi spark gap receiving antenna connect low noise high linear amplifier, and the low noise high linear amplifier may be selected
Using or the bypass low noise high linear amplifier, the low noise high linear amplifier connect low-noise amplifier, institute
Low-noise amplifier is stated for manual gain control and AGC selection, the low-noise amplifier output end connection radiofrequency signal is strong
Spend detector and AGC Control module and radio frequency tracking filter, the RF signal strength detector and AGC Control module
It connects low-noise amplifier input terminal and forms closed-loop control, the radio frequency tracking filter connection frequency mixer reconnects intermediate frequency filtering
Device, intermediate-frequency filter connection intermediate-freuqncy signal intensity detector and AGC Control module and variable gain amplifier, it is described in
Frequency signal strength detector and AGC Control module are connected with voltage controlled oscillator output end and then are connected to frequency mixer, described
Variable gain amplifier output end connects demodulation module.
Further, the whiplike receiving antenna is disposed vertically, and the Yagi spark gap receiving antenna is horizontal positioned.
In conclusion by adopting the above-described technical solution, the beneficial effects of the utility model are: using the utility model
Technical solution, the whiplike receiving antenna of right angle setting and be horizontally mounted Yagi spark gap receiving antenna, be conducive to synthesize using selection diversity
Method, to improve the signal-to-noise ratio of complete machine；4 controllable parameters in two channels are controlled, it can be neatly according to reception
Signal strength and signal quality optimize the receptivity of whole system, guarantee that the signal-to-noise ratio of complete machine is optimal；6, according to two paths of signals
Lock state and signal strength (P1 and P2), flying distance R, these parameters of flying height H1 use selection diversity synthesis side
Method, selecting a reception demodulation channel is main receiving channel, and another channel is diversity reception channel, proposes a kind of optimal tune
Degree strategy, guarantees diversity receiver best performance, and transmission range is farther.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that UAV Video of the present invention transmits reception device.
Fig. 2 is the structural schematic diagram that the present invention receives demodulation front end.
Fig. 3 is to learn training platform schematic diagram in diversity solution scheduling process of the present invention.
Fig. 4 is structural schematic diagram of the unmanned plane during flying of the present invention in the process between receiving antenna.
Specific embodiment
With reference to the accompanying drawing, the utility model is described in detail.
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
As shown in Figure 1, a kind of UAV Video transmits reception device, including receive demodulation channel unit, diversity control machine
Unit and system control and source coding unit, the reception demodulation channel unit include that the first reception demodulation channel and second connects
Demodulation channel is received, described first receives demodulation channel is made of a whiplike receiving antenna and a reception demodulation front end, whiplike
Receiving antenna is generally omnidirectional antenna, i.e., shows as 360 ° of all homogeneous radiations on figure in the horizontal direction, that is, usually described
Non-directional, general gain is little, before described second receives demodulation channel by a Yagi spark gap receiving antenna and a reception demodulation
End is constituted, and yagi aerial belongs to the directional aerial of higher gain, has higher gain, light structure, erection convenient, cheap
The advantages that, the unit number of yagi aerial is more, and gain is higher, generallys use the Yagi spark gap directional aerial of Unit 6 ~ 12, gain
Up to 10 ~ 15dB；Reception demodulation front end connection diversity controls machine unit, and the diversity control machine unit switches with signal
Module, the signal switching module switching first receive signal (TS stream) connection in demodulation channel or the second reception demodulation channel
To system control and source coding unit.This programme uses the receiving antenna of both different characteristics, the installation side of two kinds of antennas
Formula be it is orthogonal, whiplike receiving antenna can be disposed vertically, Yagi spark gap receiving antenna is horizontally arranged, simultaneously because two kinds of days
The directionality of line is with gain difference, the signal strength that unmanned plane is received in any time point diversity reception unit of flight course
Be with semaphore lock state it is differentiated, be more advantageous to using selective diversity synthetic method, to improve the signal-to-noise ratio of complete machine.
Preferably, the catcher demodulation front-end architecture in the first reception demodulation channel and the second receiving demodulation channel is identical, reception
Rf signal reception is mainly completed in demodulation channel, and frequency-selecting is amplified, and radio frequency is converted to intermediate frequency, and dynamic signal strength adjusts (AGC),
Analog-to-digital conversion, channel demodulation, TS(Transport Stream transport stream) stream formation, detection signal level and semaphore lock state
Etc. functions, and receive demodulation front-end functionality realized by ASIC circuit.As shown in Fig. 2, the reception demodulation front end is using ASIC electricity
Road specifically includes low noise high linear amplifier LNA1, low-noise amplifier LNA2, RF signal strength detector and AGC control
Device module PDET1 processed, radio frequency tracking filter FLT1, frequency mixer MIX, intermediate-frequency filter FLT2, intermediate-freuqncy signal intensity detector
And AGC Control module PDET2, variable gain amplifier VGA, voltage controlled oscillator VCO and demodulation module, the whiplike reception day
Line or Yagi spark gap receiving antenna connect low noise high linear amplifier LNA1, and the low noise high linear amplifier LNA1 may be selected
Using or the bypass low noise high linear amplifier, the low noise high linear amplifier LNA1 connection low-noise amplifier
LNA2, the low-noise amplifier LNA2 are for manual gain control and AGC selection, according to arrival low-noise amplifier LNA2's
RF signal strength and the selection of diversity control strategy are manual gain control (MGC) or AGC function, are optimal signal-to-noise ratio
(SNR), low-noise amplifier LNA2 output end connection RF signal strength detector and AGC Control module PDET1 and
Radio frequency tracking filter FLT1, the RF signal strength detector and AGC Control module PDET1 connection low-noise amplifier
LNA2 input terminal forms closed-loop control, and the radio frequency tracking filter FLT1 connection frequency mixer MIX reconnects intermediate-frequency filter
FLT2, the intermediate-frequency filter FLT2 are intermediate frequency tunable optic filter, the intermediate-frequency filter FLT2 connection intermediate-freuqncy signal intensity
Detector and AGC Control module PDET2 and variable gain amplifier VGA, variable gain amplifier VGA are intermediate frequency variable gain
Amplifier VGA, the intermediate-freuqncy signal intensity detector and AGC Control module PDET2 are connected with voltage controlled oscillator VCO output end
And then it is connected to frequency mixer MIX, frequency mixer MIX is the frequency mixer of belt variable gain amplification, the radio frequency tracking filter
FLT1 is that radio frequency is tunable, automatic to tune in centre frequency to the frequency channel of needs, is joined with the frequency of voltage controlled oscillator VCO
Dynamic, the variable gain amplifier VGA output end connects demodulation module, realizes intermediate frequency according to the IF-AGC level of demodulation module
AGC control.
Diversity control machine unit mainly completes spacing wave detecting and channel self calibration, optimizes two reception demodulation channel controls
Parameter processed, self-adapting estimation and scheduling master, diversity reception demodulate channel, and the TS for switching main receiving channel is controlled to system and information source
The functions such as decoding unit, to guarantee real-time, diversity control machine unit can be realized by FPGA circuitry.Self-adapting estimation and scheduling
Method joined channel parameters adaptive optimization method based on selection combination diversity technique.Two receptions demodulate channel
The output signal strength and semaphore lock state of (i.e. first, which receives demodulation channel and second, receives demodulation channel) are sent into diversity control
Machine unit processed, diversity control machine unit and receive the signal strength in demodulation channel and the size of semaphore lock state according to two, point
Each branch reception gain is not controlled, is optimal the signal-to-noise ratio for receiving signal, is selected by a kind of adaptive feedback control method
The signal with highest signal to noise ratio is selected as output.The realization of adaptive diversity dispatching method.Its key is to receive demodulation channel
The select permeability of optimal control parameter, the parameter include following 4 parameters: low noise high linear amplifier LAN1 use and side
The increasing of the control parameter on road, the control parameter, frequency mixer MIX of the manual gain control of low-noise amplifier LAN2 and AGC selection
The gain control parameter of beneficial control parameter, variable gain amplifier VGA.It realizes adaptive diversity scheduling, mainly includes following three
A step: the first parameter for receiving demodulation channel and the second reception demodulation channel a, is chosen, carries out machine learning training, and
Optimized parameter after practising training is stored in a tables of data；B, corresponding optimized parameter, and root are periodically selected from tables of data
It is adjusted according to the optimized parameter and receives demodulation channel performance；C, real-time monitoring first receives demodulation channel and the second reception demodulation is logical
The signal strength and semaphore lock state in road receive demodulation channel according to diversity dispatching algorithm selection first or the second reception demodulate
Channel is as main receiving channel, another is as diversity reception channel, and the TS for switching main receiving channel is controlled and believed to system
Source decoding unit completes the decoding, display and transmission of image.
Preferably, factory's debugging machine learning training platform is as shown in Figure 3.Mainly by radio-frequency signal generator, power splitter,
Diversity reception unit, the computer of carrying machine learning algorithm and display are constituted.The radio-frequency signal generator is sequentially connected function
Divide device, diversity receiver and display, the computer is connected with diversity reception unit with radio-frequency signal generator respectively.It is described whole
In a learning training algorithm, first coarse adjustment signal strength (5dB increment) is used, then fine-tuning signal intensity (0.5dB increment)
Mode carries out machine learning training, both ensure that learning training speed or had kept parameter more excellent.
It is preferably based on the realization of the lookup table function of FPGA: since diversity receiver there are 4 key parameters, in order to protect
It demonstrate,proves that entire receiving channel parameter is optimal to need parameter list to be the bigger the better, but the increase of logical resource and real-time can be brought to be deteriorated
Problem comprehensively considers above-mentioned factor, described in the present embodiment if parameter list is too small, and is not able to satisfy the needs of optimized parameter
The method that the mode of look-up table uses 8 bit address look-up tables to each parameter, first, which receives demodulation channel and second, receives demodulation
Each parameter needs 2 in channel8=256 storage units, same 4 argument address for receiving demodulation channel are using parallel
Mode connects, then a reception demodulation channel then needs 4*28=1024 storage units, due to being dual channel receiver unit, always
2*4*2 is needed altogether8=2048 storage units.Since 4 argument address in the same channel are parallel mode connections, pass through one
Secondary lookup exports 4 parameters, improves search speed.
Preferably, the structural schematic diagram during unmanned plane during flying between receiving antenna, whiplike reception are illustrated in figure 4
Antenna ANT is mutually perpendicular to Yagi spark gap receiving antenna ANT2, during unmanned plane during flying, two receiving antennas of unmanned plane distance
The distance of test point is respectively R1 and R2, and within most times, R1 and R2 are almost equal, are all indicated herein with R, and described point
Collect dispatching algorithm specifically: c1, acquisition unmanned plane and whiplike receiving antenna and Yagi spark gap receiving antenna distance R, aircraft altitude H1,
The height H2 of the whiplike receiving antenna and height H3 of Yagi spark gap receiving antenna, the pitching angle theta 1 and nothing of unmanned plane and whiplike receiving antenna
It is man-machine pitching angle theta 2(θ 1 and 2 size of θ with Yagi spark gap receiving antenna and unmanned plane during flying distance, drone flying height H1, whiplike
The antenna height H2 and flying method (rectilinear flight, orbit etc.) of receiving antenna ANT1 has close relationship, these numbers
According to can be calculated by parameter on flying control equipment (mainly using flight height above sea level, longitude and latitude, flying speed)), the
The one signal strength P1 and second for receiving demodulation channel receives the signal strength P2 in demodulation channel；C2, detection first receive demodulation
Channel and second receive demodulation channel semaphore lock state be locked out or unlocked；If c3, be locked out, and R < Ra, then
Using second receive demodulation channel based on receive demodulation channel；If be locked out, and Rb>R>Ra, H1 < Ha, then received using second
Demodulation channel is received based on demodulation channel；If be locked out, and Rb>R>Ra, H1 > Ha, P1≤P2, then using the second reception demodulation
Demodulation channel is received based on channel；If be locked out, and Rb>R>Ra, H1 > Ha, it is logical then to receive demodulation using first P1 > P2
Road；If be locked out, and R > Rb, then second is used to receive reception demodulation channel based on demodulation channel；If it is unlocked, and R <
Ra, then received using first and demodulate channel；If it is unlocked, and R > Ra, P1≤P2, then use second reception demodulation channel for
Main reception demodulates channel；If it is unlocked, and R > Ra, P1 > P2, then using first receive demodulation channel based on receive demodulation
Channel；The RaAnd RbIt is two specific ranges of the unmanned plane during flying in the process apart from receiving point, it is desirable that Rb> Ra, HaIt is unmanned plane
A particular flight height in flight course, these three parameters are according to the transmitter power and channel parameter of unmanned plane come really
It is fixed.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (3)
1. a kind of UAV Video transmits reception device, which is characterized in that including receiving demodulation channel unit, diversity controls machine list
Member and system control and source coding unit, the reception demodulation channel unit receive demodulation channel and second including first and receive
Channel is demodulated, described first, which receives demodulation channel, demodulates front end by a whiplike receiving antenna and receptions and constitutes, and described the
Two receive demodulation channel is made of a Yagi spark gap receiving antenna and a reception demodulation front end, reception demodulation front end connection point
Collect control machine unit, the diversity control machine unit has signal switching module, and the signal switching module switching first receives
The system that is signally attached in demodulation channel or the second reception demodulation channel controls and source coding unit.
2. UAV Video as described in claim 1 transmits reception device, which is characterized in that reception demodulation front end uses
ASIC circuit specifically includes low noise high linear amplifier, low-noise amplifier, RF signal strength detector and AGC control
Device module, radio frequency tracking filter, frequency mixer, intermediate-frequency filter, intermediate-freuqncy signal intensity detector and AGC Control module, can
Variable-gain amplifier, voltage controlled oscillator and demodulation module, the whiplike receiving antenna or Yagi spark gap receiving antenna connect low noise
Ultra-linear amplifier, the low noise high linear amplifier may be selected to use or bypass the low noise high linear amplifier,
The low noise high linear amplifier connects low-noise amplifier, and the low-noise amplifier is controlled for manual gain and AGC
Selection, the low-noise amplifier output end connection RF signal strength detector and AGC Control module and Radio Frequency Tracking filter
Wave device, the RF signal strength detector and AGC Control module connection low-noise amplifier input terminal form closed-loop control,
The radio frequency tracking filter connection frequency mixer reconnects intermediate-frequency filter, the intermediate-frequency filter connection intermediate-freuqncy signal intensity inspection
Survey device and AGC Control module and variable gain amplifier, the intermediate-freuqncy signal intensity detector and AGC Control module and pressure
Control oscillator output end is connected and then is connected to frequency mixer, and the variable gain amplifier output end connects demodulation module.
3. UAV Video as claimed in claim 2 transmits reception device, which is characterized in that the whiplike receiving antenna is vertical
It places, the Yagi spark gap receiving antenna is horizontal positioned.
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| CN201821251163.7U CN208540073U (en) | 2018-08-03 | 2018-08-03 | A kind of UAV Video transmission reception device |
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| CN201821251163.7U CN208540073U (en) | 2018-08-03 | 2018-08-03 | A kind of UAV Video transmission reception device |
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Cited By (2)
| 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 |
| CN110823140A (en) * | 2019-11-11 | 2020-02-21 | 华滋奔腾（苏州）安监仪器有限公司 | Demodulator and demodulation method based on frequency mixer and power detector strain sensor |
-
2018
- 2018-08-03 CN CN201821251163.7U patent/CN208540073U/en active Active
Cited By (3)
| 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 |
| CN108683942B (en) * | 2018-08-03 | 2024-01-30 | 成都睿博思科技有限公司 | Unmanned aerial vehicle video transmission receiving arrangement |
| CN110823140A (en) * | 2019-11-11 | 2020-02-21 | 华滋奔腾（苏州）安监仪器有限公司 | Demodulator and demodulation method based on frequency mixer and power detector strain sensor |
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Effective date of registration: 20240703 Address after: No. 398-123 Guangyao 2nd Road, Qingyang District, Chengdu City, Sichuan Province, China 610031 Patentee after: Chengdu Ruimi Technology Co.,Ltd. Country or region after: China Address before: No. 1609, 16th floor, Tianfu Jingrong building, 2039 Tianfu Avenue South, Tianfu New District, Chengdu, Sichuan 610000 Patentee before: CHENGDU RUIBOSI TECHNOLOGY Co.,Ltd. Country or region before: China |