Multi-lens aerial photography stable platform
Technical Field
The invention relates to a multi-lens aerial photography stable platform, in particular to a stable platform suitable for a small low-altitude remote sensing unmanned aerial vehicle.
Background
The unmanned aerial vehicle low-altitude remote sensing system is developing to the special field of photogrammetry three-dimensional mapping on the basis of realizing image map making. According to the aerial photogrammetry specifications, the unmanned aerial vehicle aerial photography system for photogrammetry has strict quantitative requirements on the attitude stability of the payload. When the airplane is in aerial photography, the airplane can be influenced by the vibration of the airplane body and the air stray airflow, the effective load can change the shooting posture, and serious problems of aerial photography loopholes, small shooting measurement intersection angle and the like are caused.
In addition to the unstable factors of the camera body, there are many factors that affect the aerial photography to obtain high-quality images, for example, for the photography of different landforms, if the camera parameters are not adjusted, the photography is performed by adopting uniform light sensitivity, resolution and shutter speed, different image qualities are inevitably obtained. And at present, the device for automatically adjusting and controlling the airborne camera of the unmanned aerial vehicle does not appear, so that the camera can not automatically adjust the parameter setting of the airborne camera of the unmanned aerial vehicle under different environmental conditions, and the quality of the aerial image of the unmanned aerial vehicle is unsatisfactory.
To above-mentioned problem, realize unmanned aerial vehicle payload's the control of increasing steady among the prior art through using independent stable platform. The platform type stable system has the advantages of high precision, simple calculation and quick response. However, the independent stable platform in the prior art has the disadvantages of large volume, complex mechanical structure, small compensation range and high price; meanwhile, the independent stable platform is generally only suitable for large military high-end unmanned aerial vehicles.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a multi-lens aerial photography stable platform.
The invention is realized by the following technical scheme:
a multi-lens aerial photography stable platform comprises a suspension arm mechanism, a camera platform, a gyroscope, a camera arranged in the camera platform and a photography control device;
the suspension arm mechanism comprises a first rotating assembly, is connected with the camera shooting platform through the first rotating assembly and controls the camera shooting platform to rotate on a first rotating plane vertical to the horizontal plane;
a second rotating assembly is arranged in the camera shooting platform and controls the camera shooting platform to rotate on a second rotating plane which is perpendicular to the horizontal plane and the first rotating plane;
the gyroscope is arranged on the camera platform, is electrically connected with the first rotating assembly and the second rotating assembly and controls the first rotating assembly and the second rotating assembly to work;
the imaging control apparatus includes: the aircraft comprises a main control module, a transmission module, a power supply module and a sensor, wherein the input end of the main control module is connected to the sensor arranged on an aircraft, the output end of the main control module is connected to a camera on the aircraft, and a data memory is arranged in the camera; the main control module is electrically connected with the transmission module, and the transmission module is connected with a data memory in the camera; the power supply module supplies power to the main control module and the transmission module; and the sensor monitors the environmental parameters in the environment where the aircraft is located and transmits the environmental parameters to the main control module.
Compared with the prior art, the camera platform has the advantages that the gyroscope, the first rotating assembly and the second rotating assembly are used, so that the camera platform is adjusted on a two-dimensional plane, the camera visual axis is convenient to stabilize, and the camera platform is prevented from shaking. Meanwhile, a complex mechanical structure platform can be omitted by using the gyroscope, and the gyroscope has the characteristics of small volume, light weight, low cost and larger compensation range.
As a further improvement of the invention, the suspension arm mechanism further comprises a suspension arm shell, and the longitudinal section of the shell is in an inverted trapezoid shape; the first rotating assembly is arranged in the suspension arm shell; the first rotating assembly comprises a steering engine, a driving gear, a driven gear and a driving rotating shaft, wherein the steering engine, the driving gear, the driven gear and the driving rotating shaft are electrically connected with the gyroscope; the center of the driving gear is connected with a steering engine rotating shaft; the driven gear is meshed with the driving gear; the driving rotating shaft is arranged in the center of the driven gear; the driving rotating shaft penetrates through the front side and the rear side of the suspension arm shell, and two ends of the driving rotating shaft are respectively exposed outside the suspension arm shell and positioned at the lower end of the suspension arm shell; the two ends of the driving rotating shaft are connected with the camera shooting platform. Furthermore, through using driving gear and driven gear cooperation to use, can make the rotation of the unipolar output drive pivot of steering wheel through the transmission of two gears, realize that the biax rotates. The longitudinal section of the suspension arm shell is designed to be inverted trapezoid, so that the occupied space and the weight of the suspension arm can be reduced, and the rigidity strength of the suspension arm can be provided.
As a further improvement of the present invention, the image pickup platform further comprises a platform housing and a beam frame; the platform shell comprises an upper shell, a lower shell and two side shells; the two upper and lower shells are buckled and connected to form an accommodating space; the two side shells are respectively arranged on two opposite sides of the joint of the upper shell and the lower shell and are fixedly connected with the upper shell and the lower shell; the beam frame is arranged in the shell; the upper shell is provided with a suspension arm opening; the lower end of the suspension arm shell penetrates through the suspension arm opening, is embedded on the beam frame and is connected with the center of the beam frame through the driving shaft; the second rotating assembly is arranged at the joint of the upper shell and the lower shell. As a further improvement of the present invention, the image pickup platform further comprises a fixed cover; the fixed cover is arranged between the upper shell and the lower shell and is buckled and connected with the lower shell; the gyroscope is arranged on the fixed cover; the beam mount is located above the fixed cover and within the upper housing. Furthermore, the upper shell and the lower shell can be separated through the fixing cover, mutual influence of internal devices is avoided, and the gyroscope and the beam frame can be borne simultaneously.
As a further improvement of the invention, two groups of mutually vertical partition plates are arranged in the lower shell and distributed in a cross shape; each group of the partition plates comprises two partition plates which are parallel to each other to form five camera accommodating grooves; the containing groove comprises a central containing groove formed by the intersection of two groups of partition plates and side containing grooves distributed in four directions of the central containing groove; the cameras are respectively arranged in the camera accommodating grooves. Further, separate into five camera holding tanks through the baffle with the casing down, can make things convenient for the installation of camera and increase the angle scope of making a video recording.
As a further improvement of the invention, the two opposite inner side walls of the lower shell are respectively provided with a fixed plate, and the two opposite outer side walls of the lower shell are respectively provided with a shaft plate; the second rotating assembly component comprises two steering engines electrically connected with the gyroscope and two connecting shafts; the two steering engines are respectively connected with the two fixed plates in the lower shell through screws; one end of each of the two connecting shafts is connected with the shaft frame plate, and the other end of each of the two connecting shafts is connected with the rotating shaft of each of the two steering engines. Furthermore, the two steering engines are matched with the connecting shaft to rotate the camera shooting platform on the second rotating plane, so that adjustment is realized.
As a further improvement of the present invention, the camera includes a forward camera disposed in the central receiving groove and four tilt cameras disposed in the side receiving grooves; the visual axis direction of the forward camera is vertically downward; the angle formed by the visual axis directions of the four oblique cameras and the visual axis direction of the forward camera is 30-45 degrees. Furthermore, the multi-angle capture of the camera shooting is realized by adjusting the visual axis angles of the five cameras, so that the whole camera shooting effect is clearer.
As a further improvement of the present invention, the main control module includes: the device comprises a controller, a memory, a data transmission end, a serial port communication end and a camera control end; the main control module is electrically connected with the transmission module through a data transmission end, and is used for quickly acquiring data information from a data memory of the camera and transmitting the data information to the controller; the serial port communication end is connected with the camera, monitors parameter information shot by the camera in real time and transmits the parameter information to the controller; the memory stores standard parameter information shot by the camera under different environmental conditions in advance; and the controller analyzes the received information and correspondingly controls the camera by using the camera control end.
As a further improvement of the invention, the power supply module comprises a power supply conversion module, a boosting module, a lithium battery, a filtering module, a voltage stabilizing module, a standby power supply and a charging module; the lithium battery is electrically connected with the power supply conversion module through the boosting module; the standby power supply respectively carries out voltage stabilization and filtering processing through a voltage stabilization module and a filtering module, and inputs the obtained stable voltage to a power supply conversion module; the power supply conversion module converts the input voltage and outputs the converted voltage for the main control module and the transmission module to use; and the charging module is started when the electric quantity of the camera battery is lower than a critical value to charge the camera.
Further, the transmission module is a USB transmitter, and the data memory of the camera is a TF/SD card.
The invention has the advantages and beneficial effects that:
1. according to the invention, the gyroscope, the first rotating assembly and the second rotating assembly are used, so that the adjustment of the camera platform on a two-dimensional plane is realized, the stability of the visual axis of the camera is facilitated, and the camera is prevented from shaking. Meanwhile, a complex mechanical structure platform can be omitted by using the gyroscope, and the gyroscope has the characteristics of small volume, light weight, low cost and larger compensation range.
2. Furthermore, through using driving gear and driven gear cooperation to use, can make the rotation of the unipolar output drive pivot of steering wheel through the transmission of two gears, realize that the biax rotates.
3. Furthermore, the multi-angle capture of the camera shooting is realized by adjusting the visual axis angles of the five cameras, so that the whole camera shooting effect is clearer.
4. Further, the state parameters of one or more digital cameras on the unmanned aerial vehicle are automatically monitored, the acquired parameters are compared with prestored standard parameters, and the driving controller correspondingly adjusts and controls the cameras, so that the automatic control of the digital cameras on the unmanned aerial vehicle is realized; the device also realizes the real-time high-speed transmission of the aerial photos by utilizing the high-speed transmission module. The device can also monitor the current state of the camera, such as the voltage value of the battery, and timely charge when the voltage of the battery is insufficient, so that the normal work of the aerial camera is ensured.
For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is an external schematic view of a three-axis gyroscope of the present invention.
Fig. 2 is a cross-sectional view of a three-axis gyroscope of the present invention.
Fig. 3 is an exploded view of a three-axis gyroscope of the present invention.
Fig. 4 is a schematic structural view of the boom mechanism of the present invention.
Fig. 5 is a schematic structural view of a lower case of the image pickup stage of the present invention.
Fig. 6 is a block diagram showing an internal configuration of the imaging control apparatus according to the present invention.
Detailed Description
Please refer to fig. 1 to 3, wherein fig. 1 is an external schematic view of a three-axis gyroscope of the present invention, fig. 2 is a cross-sectional view of the three-axis gyroscope of the present invention, and fig. 3 is an exploded view of the three-axis gyroscope of the present invention.
The invention relates to a multi-lens aerial photography stable platform, which comprises a boom mechanism 1, a camera platform 2, a camera 3 arranged in the camera platform, a gyroscope 4, a photography control device 5, a main control module 51, a transmission module 52, a power module 53 and a sensor 54, wherein the boom mechanism is connected with the camera platform 2; the device comprises a controller 511, a memory 512, a serial communication terminal 513, a camera control terminal 514 and a data transmission terminal 515; TF/SD card 6, camera battery 7; the power supply comprises a power supply conversion module 531, a boosting module 532, a lithium battery 533, a filtering module 534, a voltage stabilizing module 535, a charging module 536 and a standby power supply 537.
The boom mechanism 1 comprises a first rotating assembly 11, and is connected with the camera platform 2 through the first rotating assembly 11 to control the camera platform 2 to rotate on a first rotating plane vertical to the horizontal plane. A second rotating assembly 24 is arranged in the camera platform 2 and controls the camera platform 2 to rotate on a second rotating plane which is perpendicular to the horizontal plane and the first rotating plane; the gyroscope 4 is arranged on the camera platform 2, is electrically connected with the first rotating assembly 11 and the second rotating assembly 24, and controls the first rotating assembly 11 and the second rotating assembly 24 to work.
Please refer to fig. 4, which is a schematic structural diagram of the boom mechanism 1 of the present invention. The boom mechanism 1 comprises a first rotating assembly 11, a boom housing 12 and a link plate 13. Specifically, the longitudinal section of the boom housing 12 is an inverted trapezoid. The hanging plate 13 is arranged at the upper end of the suspension arm shell 12. The first rotation assembly 11 is disposed within the boom housing 12. The first rotating assembly 11 comprises a steering engine 111 electrically connected with the gyroscope 4, a driving gear 112, a driven gear 113 and a driving rotating shaft 114; the center of the driving gear 112 is connected with a rotating shaft of the steering gear 111; the driven gear 113 is meshed with the driving gear 112; the driving rotation shaft 114 is disposed at the center of the driven gear 113; the driving shaft 114 penetrates through the front and rear sides of the boom housing 12, and both ends thereof are respectively exposed outside the boom housing 12 and located at the lower end of the boom housing 12; both ends of the driving shaft 114 are connected to the image pickup stage 2.
The imaging platform 2 includes a platform housing 21, a beam frame 22, a fixed cover 23, and a second rotating assembly 24. The platform housing 21 includes an upper housing 211, a lower housing 212, and two side housings 213; the upper housing 211 and the lower housing 212 are coupled to each other in a snap-fit manner to form a receiving space. Two side cases 213 are provided at opposite sides of the junction of the two upper and lower cases to fixedly couple the two upper and lower cases 211 and 212. Further, a reinforcing plate 2131 is disposed between the side casing 213 and the lower casing 212.
Please refer to fig. 5, which is a schematic structural diagram of the lower housing 212 of the image capturing platform 2 according to the present invention. Specifically, the upper housing 211 is provided with a boom opening 2111. A plurality of baffles 2121 are arranged in the lower shell 212; the spacer 2121 is coupled to an inner wall of the lower case 212 to form a plurality of camera receiving grooves; the bottom of this camera holding tank is equipped with the opening of making a video recording respectively. Further, two groups of mutually perpendicular baffles 2121 are arranged in the lower shell 212 and distributed in a cross shape; each of the spacers 2121 includes two spacers 2121 parallel to each other to form five camera accommodating grooves. Specifically, the receiving groove includes a central receiving groove formed by the intersection of two sets of baffles 2121 and side receiving grooves distributed in four directions of the central receiving groove. Wherein, the cameras 3 are respectively arranged inside the camera accommodating groove.
The two opposite inner sidewalls of the lower housing 212 are respectively provided with a fixing plate 2122, and the two opposite outer sidewalls of the lower housing 212 are respectively provided with a shaft plate 2123. Specifically, the side casing 213 is provided outside the two-shaft holder plate 2123.
The fixing cover 23 is arranged between the upper shell 211 and the lower shell 212 and is buckled with the lower shell 212; the beam 22 is located above the fixed cover 23 and within the upper housing 211. The lower end of the boom housing 12 passes through the boom opening 2111 of the upper housing 211, is embedded on the beam frame 22 and is connected with the center of the beam frame 22 through the driving rotating shaft 114; the second rotating assembly 24 is disposed at the joint of the upper and lower housings.
The second rotating assembly 24 comprises two steering engines 241 electrically connected with the gyroscope 4 and two connecting shafts 242; the two steering engines 241 are respectively connected with two fixing plates 2122 in the lower housing 212 through screws. One end of each of the two connecting shafts 242 is connected to the shaft bracket plate 2123, and the other end of each of the two connecting shafts 242 is connected to the rotating shafts of the two steering gears 241.
The camera 3 comprises a forward camera 3 arranged in the central accommodating groove and four inclined cameras 3 arranged in the side accommodating grooves; the visual axis direction of the forward camera 3 is vertically downward; the angles formed by the visual axis directions of the four oblique cameras 3 and the visual axis direction of the forward camera 3 are 30-45 degrees.
The gyroscope 4 is disposed on the stationary cover 23. The gyroscope 4 is electrically connected to both the first rotor 11 and the second rotor 24, and controls the operations of the first rotor 11 and the second rotor 24.
The photography control device 5 is arranged on an aircraft and is connected with 5 digital cameras for aerial photography on the aircraft, and the 5 digital cameras are respectively positioned at different positions of the aircraft and face different directions, so that pictures at different angles can be conveniently photographed. The aircraft is provided with a GPS positioning module.
The three-axis gyro stable platform can be arranged on aircrafts such as a helicopter; when bumping or shaking caused by the influence of air flow, the position can be automatically adjusted by the stabilizing platform of the invention, so as to ensure the stability in the shooting process. Specifically, the position information of the image pickup platform 2 is detected by the gyroscope 4, and when the image pickup platform 2 tilts or shakes, the gyroscope 4 controls the first rotating assembly 11 and the second rotating assembly 24 to operate. After receiving the signal of the gyroscope 4, the steering engine 111 of the first rotating assembly 11 controls the rotation of the driving shaft 114 through the driving gear 112 and the driven gear 113; the driving shaft 114 is connected to the beam frame 22 to control the rotation of the beam frame 22, so that the imaging platform 2 can be controlled to rotate in the first rotation plane to adjust the imaging angle. Similarly, after receiving the signal of the gyroscope 4, the steering engine 241 in the second rotating assembly 24 controls the rotation of the shaft bracket plate 2123 through the connecting shaft 242, so that the camera platform 2 can be controlled to rotate on the second rotating plane, and the camera angle can be adjusted. And because the first rotating plane and the second rotating plane are perpendicular to each other, the adjustment of any angle on a two-dimensional plane can be realized.
The present invention has various modified embodiments, for example, the distribution position of the camera 3 can be arbitrarily adjusted according to different situations, and the visual axis angle of the camera 3 can also be adjusted according to specific situations.
Compared with the prior art, the invention realizes the adjustment of the camera platform 2 on a two-dimensional plane by using the gyroscope 4, the first rotating assembly 11 and the second rotating assembly 24, facilitates the stabilization of the visual axis of the camera 3 and prevents shaking. Meanwhile, a complex mechanical structure platform can be omitted by using the gyroscope 4, and the gyroscope has the characteristics of small volume, light weight, low cost and larger compensation range.
Fig. 6 is a block diagram of an internal structure of the photographing control apparatus according to the present invention. The photographing control apparatus 5 includes: a main control module 51, a transmission module 52, a power supply module 53 and a sensor 54. The main control module 51 is a single chip, such as an ARM processor with low price, high processing speed, and strong system interrupt response capability. The transmission module 52 is preferably a USB2.0 transmission controller, and may be a high-speed transmission chip. The input end of the main control module 51 is connected to the sensor 54 on the aircraft, the output end of the main control module 51 is connected to the camera 3 on the aircraft, and a data memory is arranged in the camera 3, wherein the data memory is a TF/SD card 6 in the embodiment. The main control module 51 is electrically connected to the transmission module 52, and the transmission module 52 is connected to the data memory of the camera 3. The power supply module 53 supplies power to the main control module 51 and the transmission module 52; and sensors 54 monitor parameters in the environment in which the aircraft is located and communicate to master control module 51. In the specific implementation process, three main functional modules, namely the main control module 51, the transmission module 52 and the power module 53, are respectively arranged on three circuit boards and connected in a flat cable manner.
As shown in fig. 6, the main control module 51 specifically includes: a controller 511, a memory 512, a serial communication terminal 513, a camera control terminal 514 and a data transmission terminal 515. The serial port communication terminal 513 is used as a debugging and observing serial port, is connected with the camera 3, and is used for monitoring shooting parameters of the camera 3 on the aircraft in real time, so that the controller 511 can know various states of the camera 3 in time and take appropriate regulation and control measures.
The memory 512 stores standard parameter information of camera shooting under different environmental conditions in advance; the controller 511 analyzes the received information and controls the camera via the camera control terminal 514 accordingly, so that the camera 3 can automatically adjust the parameter value in real time under different environmental conditions, and take high-quality pictures. The main control module 51 is electrically connected to the transmission module 52 through a data transmission terminal 515, and the data transmission terminal 515 is specifically an I/O port, and through communication with the transmission module 52, data information is quickly acquired from the data storage (TF/SD card) 6 of the camera 3 and is transmitted to the controller 511.
In the present invention, the sensor 54 is embodied as an illumination sensor, and the environmental parameter monitored by the sensor is illumination intensity. The illumination sensor 54 transmits the monitored current illumination intensity to the controller 511, the controller 511 searches the standard camera parameters for taking pictures under the illumination condition, which are stored in the memory 512, correspondingly, compares the standard parameters with the current camera parameters monitored by the serial port communication terminal 513, and if the standard parameters are different, the controller 511 adjusts the camera parameters through the camera control terminal 514.
In the present invention, the power module 53 specifically includes a power conversion module 531, a boost module 532, a lithium battery 533, a filtering module 534, a voltage stabilizing module 535, a charging module 536 and a backup power 537. The lithium battery 533 is electrically connected to the power conversion module 531 through the voltage boosting module 532, the standby power 537 performs voltage stabilization and filtering processing through the voltage stabilizing module 535 and the filtering module 534, respectively, and inputs the obtained stable voltage to the power conversion module 531, and the power conversion module 531 converts the input voltage and outputs the converted voltage to the main control module 51 and the transmission module 52 for use. Specifically, in this embodiment, the boosting module 532 is preferably a dc boosting chip; the voltage regulator module 535 is preferably an anti-static protected voltage regulator tube; the filtering module 534 is preferably a filtering circuit composed of an inductor and a capacitor; backup power source 537 is preferably a 12V dc power source; the power conversion module 531 converts 12v dc voltage to 5v and 3.3v stable and reliable voltages for subsequent use. The charging module 536 is activated to charge the camera battery 7 when the charge level is below a threshold (e.g., 3 v).
Other auxiliary modules, such as a Flash storage module, may also be arranged in the main control module of this embodiment. The Flash storage module can selectively store data of camera operation and can communicate with the main control module in an SPI mode. The control device is mainly applied to the field of aerial photography of aircrafts and can be suitable for automatically controlling the digital camera on the aircrafts to adjust the parameter value of the digital camera, so that the camera can obtain high-quality photos under different environmental conditions, and simultaneously, the high-speed transmission of the photos shot by the camera is controlled. The embodiment of the invention can be applied to one or more cameras, and one camera is taken as an example, but the number is not limited to the embodiment, and the number of the cameras can be increased or decreased according to actual needs when necessary. In an embodiment of the invention, the control device is arranged on the aircraft and is connected with a digital camera for aerial photography on the aircraft.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.