Telescoping scanning type multichannel imaging synchronization system

Abstract

The invention discloses a telescope scanning type multichannel imaging synchronization system. The system comprises a telescope scanning mechanism, a scanning controller, a management controller, a plurality of video processors and detection units, wherein the number of the detection units is equal to that of the video processors; wherein the scanning controller is used for collecting real-time angle information of the telescope; each video processor transmits the imaging synchronization pulse to the detection unit corresponding to each video processor; according to the GPS time code and the second pulse signal, obtaining the absolute time of the imaging starting moment and the integral absolute time of each row; receiving image data, and inputting the real-time angle information, the absolute time of the imaging starting moment and the integral absolute time of each row into the image data to obtain an image and auxiliary data; and each detection unit receives the imaging synchronization pulse, and performs synchronous integral control under the triggering of the imaging synchronization pulse to obtain image data. According to the invention, the registration precision of the images among the imaging channels is ensured. According to the invention, the registration precision of the images among the imaging channels is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of aerospace optical remote sensing, and in particular relates to a telescopic scanning multi-channel imaging synchronization system. Background Art

[0002] The space telescope scanning imaging system adopts the overall rotation scanning method of the telescope, and can realize large field of view target imaging through a small-scale detector; the telescope scanning imaging system uses two motors to drive a telescope system and a half-angle reflector to rotate unidirectionally respectively. The two are synchronized in phase to collect ground radiation information within the scanning field of view. The ground radiation information is converged to the detectors of different channels at the back end after passing through the color separation film and the relay optical system of each channel. The detectors of each channel convert the radiation information into image information and transmit it to the satellite data transmission system, and then transmit it back to the ground.

[0003] In order to obtain more scene information, telescopic scanning imaging systems usually set up multiple imaging channels at the back end to obtain data from more spectral bands. However, the image registration of each channel in the existing technology is inaccurate, which brings about the negative effect of quantitative error due to the decrease in synchronization accuracy. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a telescopic scanning multi-channel imaging synchronization system, and to ensure the registration accuracy of images between the imaging channels.

[0005] The object of the present invention is achieved through the following technical solutions: a telescopic scanning multi-channel imaging synchronization system, comprising: a telescope scanning mechanism, a scanning controller, a management controller, a plurality of video processors and detection units equal in number to the video processors; wherein the scanning controller is connected to the telescope scanning mechanism; the scanning controller controls the rotation of the telescope scanning mechanism; each video processor is connected to the detection unit corresponding to each video processor; the scanning controller collects the real-time angle information of the telescope and sends the real-time angle information of the telescope and the imaging synchronization pulse to each video processor; the management controller receives the GPS time code and the second pulse signal sent by the satellite and forwards the GPS time code and the second pulse signal to each video processor; Video processor; each video processor: receives real-time angle information, imaging synchronization pulse, GPS time code and second pulse signal, transmits the imaging synchronization pulse to the detection unit corresponding to each video processor; obtains the absolute time t1 of the imaging start moment and the absolute time t2 of each line integration according to the GPS time code and the second pulse signal; receives image data, enters the real-time angle information, the absolute time t1 of the imaging start moment and the absolute time t2 of each line integration into the image data to obtain the image and auxiliary data, and transmits the image and auxiliary data to the ground data receiving system; each detection unit: receives the imaging synchronization pulse, performs synchronous integration control under the triggering of the imaging synchronization pulse to obtain the image data, and transmits the image data to the video processor corresponding to each detection unit.

[0006] In the above telescopic scanning multi-channel imaging synchronization system, the management controller receives the pulse-per-second signal sent by the satellite once every 1 second, and the management controller receives the GPS time code sent by the satellite through the bus once every 1 second.

[0007] In the above telescopic scanning multi-channel imaging synchronization system, the scanning controller controls the telescope scanning mechanism to rotate 360° at a preset angular rate ω; the scanning controller rotates at a preset period t col Collect the real-time angle information θ of the telescope and generate a width t at the starting position of the field of view where the effective scene image needs to be obtained. s The imaging synchronization pulse and the real-time angle information θ of the telescope are sent to each video processor through a serial interface.

[0008] In the above telescopic scanning multi-channel imaging synchronization system, the video processor receives the imaging synchronization pulse, and triggers the detection unit to start at a preset period t0 at the falling edge of the imaging synchronization pulse. intRepeated integration is performed to obtain image data; the video processor obtains the absolute time t1 of the imaging start moment and the absolute time t2 of each line integration according to the GPS time code and the second pulse signal, and the absolute time t1 of the imaging start moment and the absolute time t2 of each line integration are entered into the image data to obtain the image and auxiliary data.

[0009] In the above telescopic scanning multi-channel imaging synchronization system, the preset period t col Satisfies the following relationship:

[0010]

[0011] Among them, t d is the dwell time of the detection unit.

[0012] In the above telescopic scanning multi-channel imaging synchronization system, the detection unit dwell time is obtained by the following formula:

[0013] t d =IFOV / ω;

[0014] Where ω is the angular velocity and IFOV is the instantaneous field of view of the imaging system.

[0015] In the above telescopic scanning multi-channel imaging synchronization system, the width of the imaging synchronization pulse is t s Satisfies the following relationship:

[0016]

[0017] Among them, t int is the period of the detection unit.

[0018] In the telescopic scanning multi-channel imaging synchronization system, each image data is aligned from the time dimension through the absolute time t1 of the imaging start moment in each frame image and the auxiliary data.

[0019] In the telescopic scanning multi-channel imaging synchronization system, each image data is aligned from the time dimension by integrating the absolute time t2 for each line in the image and the auxiliary data.

[0020] In the telescopic scanning multi-channel imaging synchronization system, each image data is aligned from a spatial dimension through the real-time angle information in each frame of image and auxiliary data.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The telescopic scanning multi-channel imaging synchronization system of the present invention improves the registration accuracy between multiple channels in the time dimension by generating time information;

[0023] (2) The telescopic scanning multi-channel imaging synchronization system of the present invention improves the registration accuracy between multiple channels in the spatial dimension by generating angle information. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0025] Figure 1 is a structural block diagram of a telescopic scanning multi-channel imaging synchronization system provided by an embodiment of the present invention;

[0026] Figure 2 This is a synchronization information timing diagram provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] Figure 1 is a structural block diagram of a telescopic scanning multi-channel imaging synchronization system provided by an embodiment of the present invention. Figure 1As shown, the telescopic scanning multi-channel imaging synchronization system includes: a telescope scanning mechanism, a scanning controller, a management controller, a plurality of video processors and detection units equal to the number of video processors; wherein the scanning controller is connected to the telescope scanning mechanism; the scanning controller controls the rotation of the telescope scanning mechanism; each video processor is connected to the detection unit corresponding to each video processor; the scanning controller collects the real-time angle information of the telescope and sends the real-time angle information of the telescope and the imaging synchronization pulse to each video processor; the management controller receives the GPS time code and the second pulse signal sent by the satellite and forwards the GPS time code and the second pulse signal to each video processor; each Video processor: receives real-time angle information, imaging synchronization pulse, GPS time code and second pulse signal, transmits imaging synchronization pulse to the detection unit corresponding to each video processor; obtains the absolute time t1 of imaging start moment and the absolute time t2 of each line integration according to GPS time code and second pulse signal; receives image data, inputs the real-time angle information, the absolute time t1 of imaging start moment and the absolute time t2 of each line integration into the image data to obtain the image and auxiliary data, and transmits the image and auxiliary data to the ground data receiving system; each detection unit: receives imaging synchronization pulse, performs synchronous integration control under the triggering of imaging synchronization pulse to obtain image data, and transmits the image data to the video processor corresponding to each detection unit.

[0029] The scanning controller controls the telescope scanning mechanism to rotate 360° at a constant speed, collects the real-time angle information of the telescope, and sends an imaging synchronization pulse at a specific imaging starting position; the management controller forwards the GPS time code and second pulse signal sent by the satellite; each channel video processor receives the real-time angle information, imaging synchronization pulse, GPS time code and second pulse signal, performs synchronous integration control on the detection unit, generates image synchronization information, and enters the image data and transmits it back to the ground via satellite data transmission.

[0030] The scanning controller controls the telescope scanning mechanism to rotate 360° at a fixed angular rate ω. The scene image within the 360° field of view is introduced into each channel detection unit through the optical path. The scanning controller rotates the telescope scanning mechanism at a period t col Collect the real-time angle θ of the telescope and generate a line with a width of t at the starting position of the field of view where an effective scene image needs to be obtained. s The imaging pulse is sent to each channel video processor; at the same time, the scanning controller continuously sends the real-time angle θ obtained from each acquisition point to each channel video processor through the serial interface.

[0031] The management controller receives the GPS second pulse sent by the satellite once every 1 second, and receives the GPS time code sent by the satellite through the bus once every 1 second; and forwards the second pulse and time code to the video processor of each channel.

[0032] The video processor receives the imaging synchronization pulse and triggers the detection unit to start at a preset period t0 at the falling edge of the imaging synchronization pulse. int Repeated integration is performed to obtain image data; the video processor obtains the absolute time t1 of the imaging start moment and the absolute time t2 of each line integration according to the GPS time code and the second pulse signal, and the absolute time t1 of the imaging start moment and the absolute time t2 of each line integration are entered into the image data to obtain the image and auxiliary data.

[0033] Scanning real-time angle acquisition cycle t col Confirmation method:

[0034] Calculate the detector dwell time t d :t d =IFOV / ω, IFOV is the instantaneous field of view of the imaging system, ω is the scanning angular rate of the scanning system;

[0035] Calculate the scanning real-time angle acquisition period t col :

[0036] The width of the imaging synchronization pulse t s Satisfies the following relationship:

[0037]

[0038] Among them, t int is the period of the detection unit.

[0039] Method for confirming the absolute time t1 of the imaging start moment:

[0040] The infrared video processor receives the imaging start pulse sent by the scanning controller, the second pulse sent by the management controller, and the GPS time code; the infrared video processor generates a 1Mhz local timer inside itself, and clears the local timing at the falling edge of the second pulse; at the falling edge of the imaging start pulse, the infrared video processor latches the local count value t at this time 11 ; At the falling edge of the imaging start pulse, the infrared video processor caches the latest GPS time code t 12 ;

[0041] Calculate the absolute time t1 of the imaging start moment: t1 = t 11 +t 12 .

[0042] Method for confirming the absolute integral time t2 of each row:

[0043] The infrared video processor receives the imaging start pulse sent by the scanning controller, the second pulse sent by the management controller, and the GPS time code; the infrared video processor generates a 1Mhz local timer inside itself, and clears the local timing at the falling edge of the second pulse; the infrared video processor generates a line integration pulse according to the working frequency of the detector, and at the falling edge of the line integration pulse, the infrared video processor latches the local count value t at this time 21 ; At the falling edge of the line integration pulse, the infrared video processor caches the latest GPS time code t 22 ;

[0044] Calculate the absolute time t2 of the integration moment: t2 = t 21 +t 22 .

[0045] At the beginning of each integration, each channel video processor will generate the latest real-time angle θ int Enter into each line of image auxiliary data.

[0046] The infrared video processor receives the scanning controller with a period t col The real-time angle θ sent is used as the real-time angle θ in the current line image auxiliary data at the falling edge of the line product pulse. int Enter the image data.

[0047] The synchronization method of the image data of each channel includes: through the imaging start pulse, each channel obtains the same imaging start time reference; through the imaging start time absolute time t1 in each frame of image auxiliary data, the images of each channel are aligned from the time dimension; through the row integral absolute time t2 in each row of image auxiliary data, the row images of each channel are aligned from the time dimension; through the real-time angle θ in each row of image auxiliary data int , align the images of each channel row from the spatial dimension.

[0048] like Figure 2 As shown, the infrared video processor receives the imaging start pulse sent by the scanning controller, the second pulse sent by the management controller, and the GPS time code; the infrared video processor generates a 1Mhz local timer inside itself, and clears the local timing at the falling edge of the second pulse; at the falling edge of the imaging start pulse, the infrared video processor latches the local count value t at this time 11 ; At the falling edge of the imaging start pulse, the infrared video processor caches the latest GPS time code t 12 ; Calculate the absolute time t1 of the imaging start moment: t1 = t 11 +t 12 .

[0049] like Figure 2As shown, the infrared video processor receives the imaging start pulse sent by the scanning controller, the second pulse sent by the management controller, and the GPS time code; the infrared video processor generates a 1Mhz local timer inside itself, and clears the local timing at the falling edge of the second pulse; the infrared video processor generates a line integration pulse according to the working frequency of the detector, and at the falling edge of the line integration pulse, the infrared video processor latches the local count value t at this time 21 ; At the falling edge of the line integration pulse, the infrared video processor caches the latest GPS time code t 22 ; Calculate the absolute time t2 of the integration moment: t2 = t 21 +t 22 .

[0050] like Figure 2 As shown, the infrared video processor receives the scanning controller with a period t col The real-time angle θ sent is used as the real-time angle θ in the current line image auxiliary data at the falling edge of the line product pulse. int Enter the image data.

[0051] The telescopic scanning multi-channel imaging synchronization system of the present invention improves the registration accuracy between multiple channels in the time dimension by generating time information; the telescopic scanning multi-channel imaging synchronization system of the present invention improves the registration accuracy between multiple channels in the space dimension by generating angle information. This embodiment finely fuses the data of different channels to obtain the final image, and this embodiment performs precise synchronization registration between multiple channels to reduce the quantitative error caused by the decrease in synchronization accuracy.

[0052] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A telescopic scanning multi-channel imaging synchronization system, characterized in that include: A telescope scanning mechanism, a scanning controller, a management controller, a plurality of video processors and detection units equal in number to the video processors; wherein, The scanning controller is connected to the telescope scanning mechanism; the scanning controller controls the rotation of the telescope scanning mechanism; Each video processor is connected to a detection unit corresponding to each video processor; The scanning controller collects the real-time angle information of the telescope and sends the real-time angle information of the telescope and the imaging synchronization pulse to each video processor; The management controller receives the GPS time code and the pulse-per-second signal sent by the satellite and forwards the GPS time code and the pulse-per-second signal to each video processor; Each video processor: receives real-time angle information, imaging synchronization pulse, GPS time code and second pulse signal, transmits the imaging synchronization pulse to the detection unit corresponding to each video processor; obtains the absolute time of imaging start moment and the absolute time of each line integration according to the GPS time code and second pulse signal; receives image data, enters the real-time angle information, the absolute time of imaging start moment and the absolute time of each line integration into the image data to obtain the image and auxiliary data, and transmits the image and auxiliary data to the ground data receiving system; Each detection unit: receives an imaging synchronization pulse, performs synchronous integration control under the triggering of the imaging synchronization pulse to obtain image data, and transmits the image data to a video processor corresponding to each detection unit.

2. The telescopic scanning multi-channel imaging synchronization system according to claim 1, characterized in that: The management controller receives a pulse-per-second signal sent by a satellite once every 1 second, and the management controller receives a GPS time code sent by a satellite via a bus once every 1 second.

3. The telescopic scanning multi-channel imaging synchronization system according to claim 1, characterized in that: The scanning controller controls the telescope scanning mechanism to rotate 360° at a preset angular rate ω; the scanning controller rotates at a preset period t col Collect the real-time angle information θ of the telescope and generate a width t at the starting position of the field of view where the effective scene image needs to be obtained. s The imaging synchronization pulse and the real-time angle information θ of the telescope are sent to each video processor through a serial interface.

4. The telescopic scanning multi-channel imaging synchronization system according to claim 1, characterized in that: The video processor receives the imaging synchronization pulse, and at the falling edge time t0 of the imaging synchronization pulse, triggers the detection unit to start the detection at a preset period t int Repeated integration is performed to obtain image data; the video processor obtains the absolute time t1 of the imaging start moment and the absolute time t2 of each line integration according to the GPS time code and the second pulse signal, and the absolute time t1 of the imaging start moment and the absolute time t2 of each line integration are entered into the image data to obtain the image and auxiliary data.

5. The telescopic scanning multi-channel imaging synchronization system according to claim 4, characterized in that: Preset period t col Satisfies the following relationship: Among them, t d is the dwell time of the detection unit.

6. The telescopic scanning multi-channel imaging synchronization system according to claim 5, characterized in that: The detection unit dwell time is obtained by the following formula: t d =IFOV / ω; Where ω is the angular velocity and IFOV is the instantaneous field of view of the imaging system.

7. The telescopic scanning multi-channel imaging synchronization system according to claim 1 or 3, characterized in that: The width of the imaging synchronization pulse t s Satisfies the following relationship: Among them, t int is the period of the detection unit.

8. The telescopic scanning multi-channel imaging synchronization system according to claim 1, characterized in that: The image data are aligned from the time dimension through the absolute time t1 of the imaging start moment in each frame image and the auxiliary data.

9. The telescopic scanning multi-channel imaging synchronization system according to claim 1, characterized in that: By integrating the absolute time t2 for each row in the image and auxiliary data, the image data are aligned from the time dimension.

10. The telescopic scanning multi-channel imaging synchronization system according to claim 1, characterized in that: Through the real-time angle information in each frame of image and auxiliary data, the image data are aligned from the spatial dimension.

Images