A telescopic scanning multi-channel imaging synchronous system

Abstract

The application discloses a kind of telescopic scanning type multi-channel imaging synchronous systems, comprising: telescope scanning mechanism, scanning controller, management controller, multiple video processors and with the equal number of video processor detection unit;Wherein, the scanning controller: collection telescope real-time angle information;Each video processor: imaging synchronization pulse transmission is given to the detection unit corresponding to each video processor;According to GPS time code and second pulse signal, obtain imaging starting time absolute time and each row integral absolute time;Receive image data, and real-time angle information, imaging starting time absolute time and each row integral absolute time are punched into image data to obtain image and auxiliary data;Each detection unit: receive imaging synchronization pulse, and carry out synchronous integration control under imaging synchronization pulse trigger to obtain image data.The application guarantees the registration accuracy of image between each imaging channel.The application guarantees the registration accuracy of image between each imaging channel.

Description

Technical Field

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

[0002] The space telescope scanning imaging system employs an overall rotating scanning method, enabling large-field-of-view target imaging through a small-scale detector. The system uses two motors to drive a telescope system and a half-angle reflector to rotate unidirectionally, with both synchronized in phase. This collects ground radiation information within the scanning field of view. The ground radiation information is then converged to detectors in different channels at the back end after passing through dichroic filters and relay optical systems in each channel. Each channel detector converts the radiation information into image information, which is then transmitted to the satellite data transmission system and back to the ground.

[0003] To acquire more scene information, telescopic scanning imaging systems typically set up multiple imaging channels at the back end to obtain data in more spectral bands. However, in existing technologies, the image registration of each channel is inaccurate, resulting in negative effects of quantitative errors due to decreased synchronization accuracy. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a telescopic scanning multi-channel imaging synchronization system that ensures the registration accuracy of images between each imaging channel.

[0005] The objective of this invention is achieved through the following technical solution: a telescope scanning multi-channel imaging synchronization system, comprising: a telescope scanning mechanism, a scanning controller, a management controller, multiple video processors, and a number of 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 a corresponding detection unit; the scanning controller: acquires real-time angle information of the telescope and sends the real-time angle information and imaging synchronization pulses of the telescope to each video processor; the management controller: receives GPS timecodes and second pulse signals sent by satellites and forwards the GPS timecodes and second pulse signals to each video processor. Video processors; Each video processor: receives real-time angle information, imaging synchronization pulses, GPS time codes, and second pulse signals, and transmits the imaging synchronization pulses to the detection unit corresponding to each video processor; obtains the absolute time t1 of the imaging start time and the absolute time t2 of each line integration based on the GPS time code and the second pulse signal; receives image data, inserts the real-time angle information, the absolute time t1 of the imaging start time, and the absolute time t2 of each line integration into the image data to obtain 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 trigger of the imaging synchronization pulse to obtain image data, and transmits the image data to the video processor corresponding to each detection unit.

[0006] In the aforementioned telescopic scanning multi-channel imaging synchronization system, the management controller receives a second pulse signal sent by the satellite every 1 second, and the management controller also receives a GPS time code sent by the satellite via the bus every 1 second.

[0007] In the aforementioned telescopic scanning multi-channel imaging synchronization system, the scanning controller controls the telescope scanning mechanism to rotate at a preset angular rate ω at a uniform speed of 360°; the scanning controller operates at a preset period t. col The telescope acquires real-time angle information θ, and generates a field of view with a width of t at the starting position of the field of view where an effective scene image needs to be acquired. s The imaging synchronization pulse and the telescope's real-time angle information θ are sent to each video processor via a serial interface.

[0008] In the aforementioned 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 t at the falling edge of the imaging synchronization pulse at time t0. intImage data is obtained by repeated integration; the video processor obtains the absolute time t1 of the imaging start time and the absolute time t2 of each line of integration based on the GPS time code and the second pulse signal, and inputs the absolute time t1 of the imaging start time and the absolute time t2 of each line of integration into the image data to obtain the image and auxiliary data.

[0009] In the aforementioned telescopic scanning multi-channel imaging synchronization system, the preset period t col The following relationship must be satisfied:

[0010]

[0011] Among them, t d This refers to the dwell time of the detection unit.

[0012] In the above-mentioned telescopic scanning multi-channel imaging synchronization system, the dwell time of the detector unit 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 aforementioned telescopic scanning multi-channel imaging synchronization system, the width t of the imaging synchronization pulse... s The following relationship must be satisfied:

[0016]

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

[0018] In the aforementioned telescopic scanning multi-channel imaging synchronization system, the image data are registered from the time dimension by using the absolute time t1 of the imaging start time in each frame of image and auxiliary data.

[0019] In the aforementioned telescopic scanning multi-channel imaging synchronization system, the image data are registered from the time dimension by integrating the absolute time t2 of each row in the image and auxiliary data.

[0020] In the aforementioned telescopic scanning multi-channel imaging synchronization system, the image data are registered in the spatial dimension by using 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 advantages:

[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. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

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

[0026] Figure 2 This is a timing diagram of synchronization information provided in an embodiment of the present invention. Detailed Implementation

[0027] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a structural block diagram of the telescopic scanning multi-channel imaging synchronization system provided in an embodiment of the present invention. Figure 1As shown, the telescope scanning multi-channel imaging synchronization system includes: a telescope scanning mechanism, a scanning controller, a management controller, multiple video processors, and a number of 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 a corresponding detection unit; the scanning controller: acquires the real-time angle information of the telescope and sends the real-time angle information and imaging synchronization pulses of the telescope to each video processor; the management controller: receives the GPS time code and second pulse signal sent by the satellite and forwards the GPS time code and 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 the imaging synchronization pulse to the detection unit corresponding to each video processor; obtains the absolute time t1 of imaging start and the absolute time t2 of each line integration based on the GPS time code and second pulse signal; receives image data, inserts the real-time angle information, the absolute time t1 of imaging start, and the absolute time t2 of each line integration into the image data to obtain 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 trigger of the 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 telescope's real-time angle information, and sends an imaging synchronization pulse at a specific imaging start 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 transmits the image data back to the ground via satellite data transmission.

[0030] The scanning controller controls the telescope scanning mechanism to rotate uniformly at a fixed angular rate ω, 360°. Images of the scene within the 360° field of view are introduced into each channel detection unit through the optical path; the scanning controller operates at a period t... col The telescope's real-time angle θ is acquired, and a field of view with a width of t is generated at the starting position of the field of view where an effective scene image needs to be acquired. s The imaging pulses are sent to the video processors of each channel; at the same time, the scanning controller continuously sends the real-time angle θ acquired by each acquisition point to the video processors of each channel through the serial interface.

[0031] The management controller receives GPS second pulses sent by the satellite every 1 second and GPS time codes sent by the satellite via the bus every 1 second; and forwards the second pulses and time codes to the video processors of each channel.

[0032] The video processor receives the imaging synchronization pulse and triggers the detection unit to start at a preset period t at the falling edge of the imaging synchronization pulse at time t0. int Image data is obtained by repeated integration; the video processor obtains the absolute time t1 of the imaging start time and the absolute time t2 of each line of integration based on the GPS time code and the second pulse signal, and inputs the absolute time t1 of the imaging start time and the absolute time t2 of each line of integration 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, where IFOV is the instantaneous field of view of the imaging system, and ω is the scanning angular rate of the scanning system;

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

[0036] The width t of the imaging synchronization pulse s The following relationship must be satisfied:

[0037]

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

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

[0040] The infrared video processor receives the imaging start pulse from the scanning controller, the second pulse from the management controller, and the GPS time code. The infrared video processor internally generates a 1MHz local timer, which is reset to zero 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 that moment. 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 time: t1 = t 11 +t 12 .

[0042] Method for determining the absolute time t2 of each line of integration:

[0043] The infrared video processor receives the imaging start pulse from the scanning controller, the second pulse from the management controller, and the GPS time code. Internally, the infrared video processor generates a 1MHz local timer, resetting it to zero at the falling edge of the second pulse. Based on the detector's operating frequency, the infrared video processor generates a line integration pulse, latching the local count value t at the falling edge of the line integration pulse. 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 line integral: t2 = t 21 +t 22 .

[0045] At the start of each integration iteration, each channel video processor will update the latest real-time angle θ. int Input the auxiliary data into each row of images.

[0046] The infrared video processor receives data from the scan controller in period t. col The transmitted real-time angle θ, at the falling edge of the row product pulse, will be used as the latest real-time angle θ in the buffer as the real-time angle θ in the current row image auxiliary data. int Input image data.

[0047] The synchronization method for image data across channels includes: obtaining the same imaging start time reference for each channel through the imaging start pulse; registering the images of each channel in the time dimension using the absolute time t1 of the imaging start time in each frame of auxiliary image data; registering the row images of each channel in the time dimension using the absolute time t2 of the row integral in each row of auxiliary image data; and registering the real-time angle θ in each row of auxiliary image data. int The images of each channel are registered in a 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 itself generates a 1MHz local timer, which is reset to zero 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 at the start of imaging: 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 itself generates a 1MHz local timer, which is reset to zero at the falling edge of the second pulse; the infrared video processor generates a line integration pulse according to the detector's operating frequency, and latches the local count value t at the falling edge of the line integration pulse. 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 line integral: t2 = t 21 +t 22 .

[0050] like Figure 2 As shown, the infrared video processor receives data from the scan controller at a period t. col The transmitted real-time angle θ, at the falling edge of the row product pulse, will be used as the latest real-time angle θ in the buffer as the real-time angle θ in the current row image auxiliary data. int Input 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 spatial dimension by generating angle information. This embodiment finely fuses data from different channels to obtain the final image, and performs precise synchronization and registration between multiple channels to reduce quantitative errors caused by decreased synchronization accuracy.

[0052] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A telescopic scanning multi-channel imaging synchronization system, characterized in that... include: The telescope includes a scanning mechanism, a scanning controller, a management controller, multiple video processors, and a number of detection units equal to the number of video processors; among which, 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 corresponding detection unit; 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 GPS time codes and second pulse signals sent by satellites and forwards the GPS time codes and second pulse signals to each video processor. Each video processor: receives real-time angle information, imaging synchronization pulse, GPS timecode, 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 and the absolute time of integration for each line based on the GPS timecode and second pulse signal; receives image data, inputs the real-time angle information, absolute time of imaging start, and absolute time of integration for each line into the image data to obtain image and auxiliary data, and transmits the image and auxiliary data to the ground data receiving system; among which, the absolute time of imaging start... The confirmation method is as follows: 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 internally, and resets the local timer to zero 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 at that moment. At the falling edge of the imaging start pulse, the infrared video processor caches the latest GPS timecode. ; Calculate the absolute time of the imaging start moment : = + ; Absolute time for each line of integral The confirmation method is as follows: 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 itself generates a 1MHz local timer, which is reset to zero at the falling edge of the second pulse; the infrared video processor generates a horizontal integration pulse according to the detector's operating frequency, and latches the local count value at the falling edge of the horizontal integration pulse. At the falling edge of the line integration pulse, the infrared video processor caches the latest GPS timecode. ; Calculate the absolute time of the line integral. : = + ; Each detection unit: receives the imaging synchronization pulse, performs synchronous integration control under the trigger of the imaging synchronization pulse to obtain image data, and transmits the image data to the video processor corresponding to each detection unit; The absolute time of the imaging start time in each frame of image and auxiliary data. The image data are registered from a temporal perspective; Integrate the absolute time through each frame of image and each row of auxiliary data. The image data are registered from a temporal perspective; By using real-time angle information from each frame of image and auxiliary data, the image data are registered in the spatial dimension.

2. The telescopic scanning multi-channel imaging synchronization system according to claim 1, characterized in that: The management controller receives a second pulse signal sent by the satellite every 1 second, and the management controller also receives a GPS time code sent by the satellite via the bus 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 operate at a preset angular rate. Performs a 360° uniform rotation; the scanning controller operates at a preset cycle. The telescope acquires real-time angle information θ, and generates a field of view with a width of [value missing] at the starting position of the field of view where an effective scene image needs to be acquired. The imaging synchronization pulse and the telescope's real-time angle information θ are sent to each video processor via 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, at the falling edge of the imaging synchronization pulse. The trigger detection unit begins at a preset period. Image data is obtained by repeated integration; the video processor obtains the absolute time of the imaging start moment based on the GPS timecode and second pulse signal. and the absolute time of each line of integration The absolute time of the imaging start time and the absolute time of each line of integration Image data and auxiliary data are obtained by inputting image data.

5. The telescopic scanning multi-channel imaging synchronization system according to claim 4, characterized in that: preset period The following relationship must be satisfied: ； in, This refers to the dwell time of the detection unit.

6. The telescopic scanning multi-channel imaging synchronization system according to claim 5, characterized in that: The dwell time of the detection unit is obtained by the following formula: =IFOV / ; in, ω is the angular rate, 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: width of imaging synchronization pulse The following relationship must be satisfied: ； in, The period of the detection unit.

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