CN211378082U

CN211378082U - Time synchronization device and multi-camera aerial photogrammetry device

Info

Publication number: CN211378082U
Application number: CN201922493886.9U
Authority: CN
Inventors: 白骏程
Original assignee: Beijing Qizheng Shuyuan Technology Co ltd
Current assignee: Beijing Qizheng Shuyuan Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-08-28
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a time synchronizer and polyphaser aerial photogrammetry device relates to space flight and aviation field, wherein, a time synchronizer, include: the input end of the controller (1) is connected with the time reference mechanism (2), and the input end of the controller (1) is at least connected with 1 acquisition mechanism (3); the time reference mechanism (2) is used for sending reference time; the acquisition mechanism (3) is used for feeding back the acquisition time of the acquisition signal to the controller (1); the controller (1) is used for adjusting a clock of the controller (1) according to the reference time and determining the acquisition time according to the clock. The problem of error is introduced to the time point that a plurality of images or signals that gather of a plurality of mechanisms of gathering when splicing, the time point that the mechanism gathered of gathering is inconsistent with the time of time reference mechanism.

Description

Time synchronization device and multi-camera aerial photogrammetry device

Technical Field

The utility model relates to an aerospace field, a time synchronizer and polyphaser aerial photogrammetry device specifically says so.

Background

At present, a plurality of camera systems are widely applied to the field of aerial photogrammetry, the cameras are placed at different angles by the multi-camera systems, and image data of a plurality of attitude angles are acquired by a camera synchronous exposure technology. Each camera includes control, focus, metering, shutter, image compression, and other processes, and the time spent by these processes is unstable, so that the exposure time of each camera may not be identical, which results in different actual relative positions of each shot when the multi-camera system is deployed on the aircraft. When the multi-camera system performs image splicing, the position of the time point when shooting is triggered is used as an exposure position for processing, and errors are introduced.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a time synchronizer and polyphaser aerial photogrammetry device to when solving the image or the a plurality of concatenations of signal that a plurality of collection mechanisms gathered, the time point that the collection mechanism gathered is inconsistent with the time of time reference mechanism, has introduced the problem of error.

In a first aspect, the present invention provides a time synchronizer, including: a controller;

the input end of the controller is connected with the time reference mechanism, and the input end of the controller is connected with the plurality of acquisition mechanisms;

the time reference mechanism is used for sending reference time;

the acquisition mechanism is used for feeding back an acquisition signal to the controller;

the controller is used for determining the acquisition time of the acquisition mechanism (3) according to the reference time and the acquisition signal.

Preferably, the input end of the controller is connected with the time reference mechanism through a serial port;

the serial port is used for sending the reference time;

the controller is used for adjusting the clock of the controller to be synchronous with the reference time.

Preferably, the input end of the controller is also connected with the time reference mechanism through a fracture in the outer part;

the controller is used for adjusting the clock of the controller to be synchronous with the reference time through a fracture in the outer part.

Preferably, the time reference mechanism is a GPS receiver;

the GPS receiver is used for sending the reference time to the controller.

Preferably, the acquisition mechanism is a camera.

Preferably, the camera has a mechanical or electronic shutter;

and the mechanical or electronic shutter acts to feed back the acquisition time to the controller.

Preferably, the controller is a single chip microcomputer;

the input IO port of the single chip microcomputer is connected with the time reference mechanism, and the input IO port of the controller is connected with the plurality of acquisition mechanisms.

In a second aspect, the utility model provides a polyphaser aerial photogrammetry device, include:

a time synchronizer as described above;

the time reference mechanism is a GPS receiver for sending the reference time and position fix to the controller.

The utility model discloses following beneficial effect has at least:

the utility model provides a time synchronizer and polyphaser aerial photogrammetry device to when solving the image or the a plurality of concatenations of signal that a plurality of collection mechanisms gathered, the time point of gathering the mechanism collection is inconsistent with the time of time reference mechanism, has introduced the problem of error.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 is a schematic block diagram of a time synchronizer or a multi-camera aerial photogrammetry apparatus according to an embodiment of the present invention;

figure 2 is a schematic diagram of the peripheral circuitry of the controller of figure 1 according to the present invention.

Detailed Description

The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. However, for parts not described in detail, those skilled in the art can fully understand the present invention.

Furthermore, those skilled in the art will appreciate that the drawings are provided for purposes of illustrating the objects, features, and advantages of the invention and are not necessarily drawn to scale.

Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".

Fig. 1 is a schematic block diagram of a time synchronizer or a multi-camera aerial photogrammetry apparatus according to an embodiment of the present invention; figure 2 is a schematic diagram of the peripheral circuitry of the controller of figure 1 according to the present invention. As shown in fig. 1 and 2, a time synchronization apparatus includes: the input end of the controller 1 is connected with the time reference mechanism 2, and the input end of the controller 1 is also connected with the plurality of acquisition mechanisms 3; a time reference mechanism 2 for transmitting a reference time; the acquisition mechanism 3 is used for feeding back an acquisition signal to the controller 1; and the controller 1 is used for adjusting the clock of the controller 1 according to the reference time and determining the acquisition time according to the clock and the acquisition signal. The problem of error is introduced to the time point that a plurality of images or signals that gather of a plurality of mechanisms of gathering when splicing, the time point that the mechanism gathered of gathering is inconsistent with the time of time reference mechanism.

In fig. 1 and 2, an input end of a controller 1 is connected with a time reference mechanism 2 through a serial port; the serial port is used for sending the reference time; a controller 1 for adjusting a clock of the controller 1 to be synchronized with a reference time.

In fig. 1 and 2, the input of controller 1 is also connected to time reference device 2 via an external interruption; a controller 1 for adjusting the clock of the controller 1 to be synchronized with a reference time by a break in the exterior.

In fig. 1 and 2, the time reference mechanism 2 is a GPS receiver 21; a GPS receiver 21 for transmitting the reference time to the controller 1. Specifically, the GPS receiver 21 is used to receive ball satellite positioning system (GPS) position information, which acquires time with accuracy on the order of microseconds. That is, the GPS receiver 21 provides the controller 1 with position data (position location) and time data (reference time).

In fig. 1 and 2, the capturing mechanism 3 may be one or more of an image, sound, or position capturing mechanism. For example, the acquisition mechanism 3 may be a camera 31. The camera 31 may be a digital camera, the camera 31 having a mechanical or electronic shutter; the mechanical or electronic shutter acts and feeds back the acquired signal to the controller 1. The mechanical or electronic shutter is actuated and the camera 31 sends an electrical pulse signal to the controller 1 indicating that the camera 31 actually triggered the taking of a picture.

Specifically, the controller 1 acquires an exposure feedback signal (i.e., an acquisition signal) of each camera 31, the controller 1 synchronizes the exposure feedback signal of each camera 31 with a high-precision clock of the controller 1, obtains a precise photographing time (precise exposure time) of each camera 31, and finally interpolates the GPS position trajectory using the precise exposure time to obtain a precise exposure position, thereby eliminating the problem of error of the exposure position of the multi-camera system.

The utility model discloses in, camera 31 and GPS receiver 21 mutually support, can be when acquireing image data, and the time and the positional data (position location) of synchronous acquisition high accuracy improve measurement accuracy greatly.

In fig. 1 and 2, a controller 1 is a single chip microcomputer; the input IO port of the single chip is connected with the time reference mechanism 2, and the input IO port of the controller 1 is connected with the plurality of acquisition mechanisms 3.

In fig. 1 and 2, the controller 1 may be a single chip microcomputer or a controller such as a PLC, but the controller 1 of the present invention is preferably a single chip microcomputer; because controllers such as PLC generally are expensive, and the price is generally between several thousand to several tens of thousands, but the price of singlechip is between several mao to several money, consequently the utility model discloses a controller is preferred singlechip. Such as: the model is STC89751 singlechip or meaning semiconductor STM32F4 singlechip.

In fig. 2, the controller 1 is a single chip CPU1 (i.e., a single chip 20 with model STC 89751), the single chip CPU1 has 22 pins (pin 1-pin 22), pin 9 of the single chip CPU1 is connected to a power supply VCC through a filter capacitor C1, and pin 9 of the single chip CPU1 is also connected to ground GND through a first resistor R1; pins 18 and 19 of the singlechip CPU1 are respectively connected with two ends of a crystal oscillator Y1, and two ends of the crystal oscillator Y1 are respectively connected with ground GND through a second capacitor C2 and a third capacitor C3; 20 pins of the singlechip CPU1 are connected with the ground GND; pin 40 of the singlechip CPU1 is connected with a power supply VCC.

In fig. 2, pins 5 and 6 of the single chip microcomputer CPU1 are respectively connected to the output end of the first time reference mechanism 2; the 31 feet of the singlechip CPU1 are connected with the output end of the acquisition mechanism 3, and if the acquisition mechanism 3 has a plurality of pins, the pins can be respectively connected with other input pins of the singlechip CPU 1.

In fig. 2, the 5 feet of singlechip CPU1 can be as outer fracture, if singlechip CPU1 carries out the transmission of benchmark time with time reference mechanism 2 through the serial ports, then singlechip CPU1 has the serial ports with time reference mechanism 2, and the connected mode of serial ports is prior art, the utility model discloses do not do the detailed description.

The embodiment of the utility model provides an in, controller 1 links to each other with GPS receiver 21 through serial ports and external fracture, and controller 1 with system clock adjust to with time base time synchronization, realize the utility model discloses a time synchronization. After the time synchronization, the accurate photographing time (acquisition time) of the camera 31 can be obtained by receiving the photographing signal (acquisition signal) of the camera 31, and the accurate photographing time can be used to find the corresponding accurate photographing position in the position track recorded by the GPS.

And simultaneously, the utility model provides a polyphaser aerial photogrammetry device, include: the time synchronization device as above; the time reference means 2 is a GPS receiver 21, and the GPS receiver 21 is used for transmitting a reference time and performing position location. The acquisition mechanism 3 may be a camera 31. The camera 31 has a mechanical or electronic shutter; the mechanical or electronic shutter acts and feeds back the acquired signal to the controller 1. The method and the device solve the problem that errors are introduced when the position of a time point when shooting is triggered is used as an exposure position for processing when a multi-camera system carries out image splicing. The utility model discloses can provide the position of shooing of high accuracy for polyphaser aerial photogrammetry system, solve the unsafe problem in current polyphaser aerial photogrammetry system exposure position.

The above-mentioned embodiments are merely embodiments for expressing the invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes, substitutions, modifications, etc. can be made without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A time synchronization apparatus, comprising: a controller (1), characterized by:

the input end of the controller (1) is connected with the time reference mechanism (2), and the input end of the controller (1) is also connected with the plurality of acquisition mechanisms (3);

the time reference mechanism (2) is used for sending reference time;

the acquisition mechanism (3) is used for feeding back an acquisition signal to the controller (1);

the controller (1) is used for determining the acquisition time of the acquisition mechanism (3) according to the reference time and the acquisition signal;

wherein the controller (1) is a singlechip;

the input IO port of the single chip microcomputer is connected with the time reference mechanism (2), and the input IO port of the controller (1) is connected with the acquisition mechanisms (3).

2. A time synchronization apparatus as claimed in claim 1, wherein:

the input end of the controller (1) is connected with the time reference mechanism (2) through a serial port;

the serial port is used for sending the reference time;

the controller (1) is used for adjusting the clock of the controller (1) to be synchronous with the reference time.

3. A time synchronization apparatus as claimed in claim 2, wherein:

the input end of the controller (1) is also connected with the time reference mechanism (2) through a fracture in the outer part;

the controller (1) is used for adjusting the clock of the controller (1) to be synchronous with the reference time through a fracture in the outer part.

4. A time synchronizing device according to any one of claims 1 to 3, characterized in that:

the time reference mechanism (2) is a GPS receiver (21);

the GPS receiver (21) is used for sending the reference time to the controller (1).

5. A time synchronizing device according to any one of claims 1 to 3, characterized in that:

the acquisition mechanism (3) is a camera (31).

6. The time synchronization apparatus of claim 5, wherein:

the camera (31) has a mechanical or electronic shutter;

and the mechanical or electronic shutter acts to feed back the acquired signal to the controller (1).

7. A multi-camera aerial photogrammetry apparatus comprising:

a time synchronizer according to any one of claims 1-6;

the time reference mechanism (2) is a GPS receiver (21), and the GPS receiver (21) is used for sending the reference time and the position location to the controller (1).