A space micro monitoring camera based on android mobile phone mainboard reinforcement

Abstract

The application belongs to the field of micro cameras, and particularly relates to a space micro monitoring camera based on reinforcement of an Android mobile phone mainboard. The space micro monitoring camera comprises a mobile phone management board, a mobile phone mainboard, a main shell, a monitoring camera external connector, an installation ear and a monitoring camera grounding pile. The functions of the monitoring camera are completed by the mobile phone management board and the mobile phone mainboard. The task of the mobile phone management board is to perform power-on, reset and other management control on the mobile phone, monitor and manage the health state of the mobile phone, receive image data of the mobile phone mainboard and communicate with a satellite platform. The mobile phone mainboard completes the imaging function and forwards the image data to the mobile phone management board through a USB interface.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of micro cameras, and particularly relates to a space micro monitoring camera based on Android mobile phone mainboard reinforcement. BACKGROUND

[0002] The monitoring camera is the eye of a space device such as a satellite or a detector, and is a load carried by almost all space devices. The traditional space monitoring camera has large mass, volume and power consumption, high cost, and a long development cycle, and is mostly a fixed-focus or zoom camera. The fixed-focus camera has a simple structure, but its objects that can be shot in space are limited to a fixed focal length. The zoom camera needs to design a complex optical system, and is not suitable for a space detector with limited installation space or a micro-nano satellite platform.

[0003] Nowadays, smart phones are closely related to our work and life. After 20 years of development, the smart phone integrates multiple functional modules such as power management, communication, high-performance CPU, operating system, software update, large-capacity storage, high-definition camera, acceleration sensor, compass, and the like in a limited volume. The low-cost COTS devices and the industrialization and platformization of mobile phone development and production make the development cost lower and the integration and functional density higher. SUMMARY

[0004] The application provides a space micro monitoring camera based on Android mobile phone mainboard reinforcement to solve the problems of low reliability of software and hardware joint reinforcement design based on COTS devices in an extreme space environment of extreme high and low temperature, strong radiation and vacuum, and low reliability of mobile phone APP unmanned operation in a space application environment.

[0005] To achieve the above object, the application provides the following technical scheme.

[0006] A space micro monitoring camera based on Android mobile phone mainboard reinforcement comprises a mobile phone management board, a mobile phone mainboard and a main shell 3; the mobile phone management board and the mobile phone mainboard are arranged in the main shell.

[0007] The mobile phone management board comprises an MCU module, a CAN controller, a first CAN driver, a second CAN driver, a watchdog hardware, a bus transmitter and a power management module.

[0008] The mobile phone mainboard comprises a mainboard USB interface, a sensor module, a battery interface and a mobile phone mainboard power management module.

[0009] The mobile phone management board is connected to the mobile phone mainboard through a first rigid plate, a second rigid plate and a third rigid plate; the first rigid plate is connected to the mainboard USB interface; the second rigid plate is connected to the sensor module; and the third rigid plate is connected to the battery interface.

[0010] The management board USB interface on the MCU module is connected with the main board USB interface of the mobile phone main board through a flexible cable.

[0011] The MCU module is connected with the CAN controller through the I 2 The sensor module is connected with the C bus through a flexible cable.

[0012] The power management module is connected with the battery interface through a flexible cable, and the MCU module is connected with the control end of the power supply switch through a GPIO pin.

[0013] The MCU module is connected with the power management module of the mobile phone main board through a flexible cable.

[0014] The MCU module is connected with the CAN controller, the CAN controller is connected with the first CAN driver and the second CAN driver, and the MCU module is connected with the bus transmitter through an SPI bus.

[0015] The MCU module is connected with the watchdog hardware.

[0016] Preferably, the sensor module comprises a temperature sensor, a voltage sensor and a current sensor, and the temperature sensor, the voltage sensor and the current sensor are all provided with an alarm signal pin, and the temperature sensor, the voltage sensor and the current sensor are connected with the GPIO pin of the MCU module through the alarm signal pin.

[0017] The temperature sensor, the voltage sensor and the current sensor are all provided with an alarm threshold, and when any data of the temperature sensor, the voltage sensor and the current sensor exceeds the corresponding alarm threshold, the MCU module receives an alarm signal.

[0018] Preferably, the first rigid plate is connected with the main board USB interface through a surface mount connector.

[0019] Preferably, the second rigid plate is connected with the sensor module through a surface mount connector.

[0020] Preferably, the third rigid plate is connected with the battery interface through a surface mount connector.

[0021] Preferably, the Efuse module is further included, the Efuse module is externally connected with a 12V input power supply, and is connected with the power management module.

[0022] Preferably, the enhanced MOSFET is further included, the source of the enhanced MOSFET is grounded, the drain is connected with the power-on switch of the mobile phone main board, the GPIO output of the control MOSFET is a pulse width variable square wave signal, the conduction time of the MOSFET is changed, and the output voltage of the monitoring camera itself DC / DC is kept constant when the mobile phone main board is powered on.

[0023] Preferably, the main shell is provided with an upper cover plate, and the lens cover is adhered to the upper cover plate by epoxy resin; the main shell is also provided with external mounting fastening screws, and the external mounting fastening screws are point-sealed on the main shell by polyurethane varnish.

[0024] Preferably, the main shell is also provided with a monitoring camera external connector, mounting ears and a monitoring camera grounding stake.

[0025] Preferably, the mounting ears are connected with the satellite or the detector by screws.

[0026] The present application has the advantages of:

[0027] A mobile phone management board is additionally arranged on the mobile phone main board, and the connection between the mobile phone main board and the mobile phone management board adopts a connection of rigid board combined with flexible cable, so that the shape can be changed according to space limitation during assembly, and the monitoring camera debugging and assembly are more flexible.

[0028] The image transmission can adopt a CAN bus used by traditional satellite to transmit image data in a slow change telemetry mode, or can adopt a SPI bus with high transmission rate, so as to facilitate user selection.

[0029] The sensor module is arranged to monitor the working state of the mobile phone main board, and when the data exceeds an alarm threshold, the sensor sends an alarm signal to the mobile phone management board through an I2C bus, so as to facilitate the mobile phone management board to make corresponding disposal to the mobile phone main board.

[0030] The enhanced MOSFET is arranged to simulate the starting process, so that the GPIO output of the MOSFET is a pulse width variable square wave signal, the conduction time of the MOSFET is changed, the output voltage of the monitoring camera DC / DC is kept constant when the mobile phone main board starts, the influence of the mobile phone starting on the entire bus voltage is balanced to a period of time, and the bus voltage is not caused to be suddenly reduced.

[0031] The Efuse module is additionally arranged to protect the circuit from overvoltage / undervoltage and overcurrent. DETAILED DESCRIPTION

[0032] The description and the accompanying drawings of the specification illustrate the preferred embodiments of the present application, and serve to explain the principles of the present application, and do not limit the scope of the present application. In the drawings:

[0033] Figure 1 It is a principle block diagram of the present application.

[0034] Figure 2 It is a main application diagram of the present application.

[0035] Figure 3 It is a side application diagram of the present application.

[0036] In the diagram, 1 is the mobile phone management board, 11 is the MCU module, 12 is the CAN controller, 13 is the first CAN driver, 14 is the second CAN driver, 15 is the watchdog hardware, 16 is the bus transmitter, 17 is the power management module, 18 is the Efuse module, 2 is the mobile phone motherboard, 201 is the first rigid plate, 202 is the second rigid plate, 203 is the third rigid plate, 21 is the motherboard USB interface, 22 is the sensor module, 23 is the battery interface, 24 is the mobile phone motherboard power management module, 3 is the main housing, 31 is the top cover, 32 is the lens cover, 33 is the external mounting screw, 4 is the external connector for the surveillance camera, 5 is the mounting ear, and 6 is the grounding stake for the surveillance camera. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0038] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0039] Remove the screen and battery of the phone to be modified. If necessary, remove any interfering structural components around the motherboard of the phone to be modified, including the front camera, vibrator, etc., for process and structural reinforcement.

[0040] Example 1:

[0041] like Figure 1 The illustrated miniature space surveillance camera, based on an Android phone motherboard, includes a phone management board 1, a phone motherboard 2, a main housing 3, an external connector for the surveillance camera 4, a mounting ear 5, and a grounding stake for the surveillance camera 6.

[0042] A mobile phone management board 1 is added to the mobile phone motherboard 2 to complete the power supply and distribution management of the mobile phone motherboard 2, and to complete the communication connection, information transmission and management with other devices in space; the mobile phone management board 1 includes an MCU module 11, a CAN controller 12, a first CAN driver 13, a second CAN driver 14, a watchdog hardware 15, a bus transmitter 16, a power management module 17, and an Efuse module 18; the mobile phone motherboard 2 includes a motherboard USB interface 21, a sensor module 22, a battery interface 23, and a mobile phone motherboard power management module 24.

[0043] The mobile phone management board 1 is connected with the mobile phone main board 2 through the first rigid plate 201, the second rigid plate 202 and the third rigid plate 203; the first rigid plate 201 is connected with the main board USB interface 21 through the surface-mounted connector; the second rigid plate 202 is connected with the sensor module 22 through the surface-mounted connector; the third rigid plate 203 is connected with the battery interface 23 through the surface-mounted connector;

[0044] The MCU module 11 is provided with a management board USB interface 111, the management board USB interface 111 is flexibly connected with the main board USB interface 21 of the mobile phone main board 2; the MCU module 11 is flexibly connected with the mobile phone main board power management module 24 through the flexible cable, and the booting and reset control operation is carried out; the first rigid plate is provided with a first surface-mounted connector, and the first surface-mounted connector corresponds to the connector on the mobile phone main board power management module 24.

[0045] The Efuse module 18 is connected with the power management module 17, and the power management module 17 is flexibly connected with the battery interface 23 through the power supply switch;

[0046] The MCU module 11 is connected with the control end of the power supply switch through the GPIO pin, and the on-off of the power supply switch is controlled to control the power supply to the mobile phone main board.

[0047] The power management module 17 outputs 5.2V current to the mobile phone main board 2 through the battery interface 23, and outputs 3.3V current to the MCU module 11.

[0048] In addition to supplying power to the mobile phone, the commercial mobile phone needs to press the boot key when booting, and the application selects the enhanced MOSFET to simulate the booting process, the source of the enhanced MOSFET is connected with the ground, and the drain is connected with the power-on switch of the mobile phone main board; when the GPIO is low, it is high after passing through the inverter, and drives the MOSFET to be turned on; after the power-on switch is connected with the ground for a certain time, the mobile phone main board can be normally booted, and the Android system and related app can also be normally run.

[0049] The traditional booting strategy sets the GPIO of the control MOSFET as a constant low level, which is high after passing through the inverter, and directly drives the MOSFET to be turned on; the application makes the GPIO of the control MOSFET output a pulse width variable square wave signal, changes the conduction time of the MOSFET, and makes the output voltage of the monitoring camera itself DC / DC keep constant when the mobile phone main board 2 is booted, balances the influence of the mobile phone booting on the whole bus voltage to a certain period of time, and does not cause the bus voltage to drop suddenly.

[0050] The MCU module 11 is connected with the I 2The C bus flexible connection sensor module 22 includes a temperature sensor, a voltage sensor and a current sensor, which are arranged on the mobile phone mainboard 2 to monitor the temperature, voltage and current of the mobile phone mainboard 2, and the monitoring data is sent to the host device as telemetry information through the bus transmitter 16 or the CAN controller 12, as health management information of the monitoring camera, to determine whether the monitoring camera works normally and whether heating of the thermal control device is needed.

[0051] The temperature sensor, the voltage sensor and the current sensor are all provided with alarm signal pins connected to the GPIO pin of the MCU module 11, and the alarm threshold values of the temperature sensor, the voltage sensor and the current sensor are set, so that the MCU module 11 can make corresponding processing according to the change of the collected alarm signal pin level when the temperature, voltage or current value exceeds the alarm threshold value. The temperature of the mobile phone mainboard 2 is measured, and the voltage and current of the mobile phone mainboard 2 are monitored, and the monitoring data is sent to the on-board computer or other host device as telemetry information, as health management information of the monitoring camera, to determine whether the monitoring camera works normally and whether heating of the thermal control device is needed. The alarm signal pins of the sensors are connected to the GPIO pins of the MCU module 11, and the alarm threshold values of the sensors are set, so that the MCU module 11 can make corresponding processing according to the change of the collected alarm signal pin level when the temperature, voltage or current value exceeds the preset safety value.

[0052] The MCU module 11 is connected with the bus transmitter 16 through the SPI bus to transmit image data, and the MCU module 11 is connected with the first CAN driver 13 and the second CAN driver 14 through the CAN controller 12, the first CAN driver 13 transmits image data through the CANA line, and the second CAN driver 14 transmits image data through the CANB line.

[0053] The pixel size of the image file of the monitoring camera can be selected, and the original image can be obtained, and the working mode can be customized according to the user application scene, the short-time continuous shooting and long-time monitoring functions can be selected to realize, the space unmanned operation is solved by using the on-board app to send the dog feeding signal, the reliability of the software is solved, and the monitoring management of the app exception in the long-time monitoring application can be realized.

[0054] The reset design of the combination of the hardware watchdog and the software watchdog is adopted in the application, so that the space application reliability of the monitoring camera is further enhanced. It is impossible to directly realize the reset of the processor of the commercial mobile phone on the basis of the original mobile phone. Therefore, the watchdog mechanism of the mobile phone mainboard under the control of the mobile phone management board is realized, and different levels of device reset can be realized according to different conditions.

[0055] The watchdog hardware 15 is connected to the MCU module 11. The watchdog hardware 15 has two signals: a feed input and a reset output. The GPIO port of the MCU module 11 outputs a feed signal within a certain time period. When the instruction set of the MCU module 11 is abnormal or a deadlock occurs, the program will block or crash, thus preventing normal feed. The watchdog hardware 15 then resets the MCU module 11 and performs a complete reset of the surveillance camera. Another scenario is when the mobile operating system or application app fails to start normally, or the application app exits abnormally while working. In this case, only the mobile phone motherboard 2 needs to be reset.

[0056] The MCU module 11 includes a watchdog program in its software. When the mobile motherboard 2 powers on and the Android system loads, the satellite application (app) is launched. The app sends startup information to the mobile management board 1 via USB. If the mobile management board 1 does not receive the startup information within a preset time, it can power off the mobile motherboard 2 and wait for the preset time before powering it back on. Upon receiving the startup information from the satellite app, the MCU module 11 starts the watchdog program, receiving a "feed the watchdog" signal from the satellite app within a set time limit. If the app exits abnormally, the mobile management board 1 can reset the mobile motherboard 2, restoring it to its initial state.

[0057] Both the mobile phone management board 1 and the mobile phone motherboard 2 are located inside the main housing 3. The main housing 3 is provided with an upper cover plate 31. The lens cover 32 is glued to the upper cover plate 31 with epoxy resin. The main housing 3 is also provided with external mounting fastening screws 33. Each external mounting fastening screw 33 is spot sealed with polyurethane varnish to improve the connection reliability.

[0058] The main housing 3 is also equipped with an external connector 4 for the surveillance camera, a mounting ear 5, and a grounding stake 6 for the surveillance camera.

[0059] Mounting ear 5 is connected to the main unit by screws.

[0060] In space applications, surveillance cameras are often connected to the system bus along with other devices. During the power-on process of a mobile phone, the loading of Android system programs and network searches cause a sharp increase in transient current, which can lead to a sudden drop in bus voltage and affect the stable operation of other system devices. This invention reduces the impact of the large transient current during mobile phone power-on on other devices through two methods:

[0061] First, use electronic fuse-type power management devices at the power input of the surveillance camera to monitor the equipment and set up over / under voltage protection and overcurrent protection;

[0062] Second, change the traditional start strategy. The traditional start strategy sets the GPIO of the control MOSFET as a constant low level, which is high level after passing through the inverter, and drives the MOSFET to be directly turned on. The application makes the GPIO of the control MOSFET output a pulse width variable square wave signal, changes the turn-on time of the MOSFET, makes the output voltage of the monitoring camera itself DC / DC remain constant when the mobile phone mainboard is started, balances the influence of the mobile phone start on the whole bus voltage to a period of time, and does not cause the bus voltage to drop suddenly.

[0063] The application aims to overcome the reliability of the soft and hardware joint reinforcement design based on COTS devices in the extreme space environment of extreme high and low temperature, strong radiation and vacuum, and the space application environment of the APP unmanned operation of the mobile phone, and proposes a low-cost new type of space monitoring camera implementation mode.

[0064] It is to be understood by those skilled in the art that the application can be implemented by other embodiments without departing from the spirit or essential characteristics thereof. Therefore, the above disclosed embodiments are only examples in all aspects, and are not the only ones. All changes within the scope of the application or within the scope equivalent to the application are included in the application.

[0065] Those skilled in the art should understand that the embodiments of the application can be provided as a method, a system or a computer program product. Therefore, the application can adopt a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware aspects. Moreover, the application can adopt the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer usable program code.

[0066] The application is described with reference to flowcharts and / or block diagrams of the method, device (system) and computer program product according to the embodiments of the application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 The function of one flow or multiple flows and / or blocks Figure 1 The device for realizing the function specified in one block or multiple blocks.

[0067] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the flow Figure 1 one or more flow or blocks and / or blocks Figure 1 one or more flow or blocks and / or blocks

[0068] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flow Figure 1 one or more flow or blocks and / or blocks ​ one or more flow or blocks and / or blocks

[0069] Finally, it should be noted that the above-mentioned embodiments are merely used to illustrate the technical solutions of the present application, rather than limit the present application. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the technical solutions of the present application can still be modified or equivalent replaced without departing from the spirit and scope of the present application, and any modification or equivalent replacement should be covered in the protection scope of the claims of the present application.

Claims

1. A space miniature surveillance camera based on an Android mobile phone motherboard reinforced with concrete, characterized in that, It includes a mobile phone management board (1), a mobile phone motherboard (2), and a main housing (3); the mobile phone management board (1) and the mobile phone motherboard (2) are located inside the main housing (3); The mobile phone management board (1) includes an MCU module (11), a CAN controller (12), a first CAN driver (13), a second CAN driver (14), a watchdog hardware (15), a bus transmitter (16), and a power management module (17); The mobile phone motherboard (2) includes a motherboard USB interface (21), a sensor module (22), a battery interface (23), and a mobile phone motherboard power management module (24); The mobile phone management board (1) is connected to the mobile phone motherboard (2) through the first rigid plate (201), the second rigid plate (202) and the third rigid plate (203); the first rigid plate (201) is connected to the motherboard USB interface (21); the second rigid plate (202) is connected to the sensor module (22); and the third rigid plate (203) is connected to the battery interface (23). The management board USB interface (111) on the MCU module (11) is connected to the motherboard USB interface (21) of the mobile phone motherboard (2) via a flexible cable; MCU module (11) via I 2 C-bus flexible connection sensor module (22); The power management module (17) is connected to the battery interface (23) via a flexible cable; the MCU module (11) is connected to the control terminal of the power supply switch via GPIO pins; The MCU module (11) is connected to the power management module (24) of the mobile phone motherboard via a flexible cable; The MCU module (11) is connected to the CAN controller (12), and the CAN controller (12) is connected to the first CAN driver (13) and the second CAN driver (14); the MCU module (11) is connected to the bus transmitter (16) via the SPI bus; The MCU module (11) is connected to the watchdog hardware (15) and also includes an enhanced MOSFET. The source of the enhanced MOSFET is grounded and the drain is connected to the power-on switch of the mobile phone motherboard (2). This causes the GPIO of the control MOSFET to output a square wave signal with a variable pulse width, changing the conduction time of the MOSFET, so that the output voltage of the monitoring camera's own DC / DC remains constant when the mobile phone motherboard (2) is powered on.

2. A space miniature surveillance camera based on Android mobile phone motherboard reinforcement as described in claim 1, characterized in that, The sensor module (22) includes a temperature sensor, a voltage sensor and a current sensor. The temperature sensor, voltage sensor and current sensor are all equipped with alarm signal pins. The temperature sensor, voltage sensor and current sensor are connected to the GPIO pins of the MCU module (11) through the alarm signal pins. The temperature sensor, voltage sensor and current sensor are all equipped with alarm thresholds. When any data of the temperature sensor, voltage sensor and current sensor exceeds the corresponding alarm threshold, the MCU module (11) receives the alarm signal.

3. A space miniature surveillance camera based on Android mobile phone motherboard reinforcement as described in claim 1, characterized in that, The first rigid plate (201) is connected to the motherboard USB interface (21) via a surface-mount connector.

4. A space miniature surveillance camera based on Android mobile phone motherboard reinforcement as described in claim 1, characterized in that, The second rigid plate (202) is connected to the sensor module (22) via a surface-mount connector.

5. A space miniature surveillance camera based on Android mobile phone motherboard reinforcement as described in claim 1, characterized in that, The third rigid plate (203) is connected to the battery interface (23) via a surface-mount connector.

6. A space miniature surveillance camera based on Android mobile phone motherboard reinforcement as described in claim 1, characterized in that, It also includes an Efuse module (18), which is connected to an external 12V input power supply and a power management module (17).

7. A space miniature surveillance camera based on Android mobile phone motherboard reinforcement as described in claim 1, characterized in that, The main housing (3) is provided with an upper cover plate (31), and the lens cover (32) is glued to the upper cover plate (31) with epoxy resin adhesive; The main housing (3) is also provided with external mounting fastening screws (33), which are all sealed on the main housing (3) with polyurethane clear varnish.

8. A space miniature surveillance camera based on Android mobile phone motherboard reinforcement as described in claim 1, characterized in that, The main housing (3) is also equipped with an external connector (4) for the surveillance camera, mounting ears (5) and a grounding stake (6) for the surveillance camera.

9. A space miniature surveillance camera based on Android mobile phone motherboard reinforcement as described in claim 8, characterized in that, The mounting ear (5) is connected to the satellite or detector by screws.

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