JP3047443B2 - Operation mode autonomous control radiometer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial satellite, and more particularly, to an operation mode autonomous control radiometer mounted on an artificial satellite to image a celestial body surface.

[Conventional technology]

Conventional radiometers mounted on artificial satellites do not have a function of autonomously selecting and imaging an area indicating a specific state of the celestial body surface. For example, when trying to selectively capture an area of the Earth's surface that is not covered by clouds, a human determines whether or not there is a cloud from an image captured by a geostationary weather satellite or the like, and captures the image by inputting a control command. Mode was controlled.

[Problems to be solved by the invention]

In the above-mentioned conventional radiometer, for example, when mounted on a satellite orbiting the earth to image the earth's surface from the sky,
There are land and sea areas on the earth's surface, and clouds exist in the sky. These have different brightness, so they are designed and manufactured for land observation, sea area observation, and meteorological observation. It had been. For example, radiometers for terrestrial observation and marine observation have a selective operation mode in which no image is taken where there is a cloud due to restrictions on the data rate of the satellite and restrictions on the life of the radiometer. ing.

In this case, the operation is performed by preparing an image mainly taken from a geostationary meteorological satellite at the time of the scheduled imaging, reading the cloud amount of the planned imaging area from the image on the ground, and determining whether or not to capture the image.

For this reason, in long-term operation, not only a huge amount of time and cost is spent in preparation immediately before imaging, but also there is a drawback that the determination criterion is hardly constant.

An object of the present invention is to provide an operation mode autonomous control radiometer capable of solving such disadvantages and automatically performing conventional selective operation.

[Means for solving the problem]

The present invention relates to an operation mode autonomous control radiometer in which a radiometer is mounted on an artificial satellite navigating around a celestial body, and the operation mode of the radiometer is autonomously controlled to observe the state of the surface of the celestial body in orbit. Then, from the data taken on the next orbit, the state data of the celestial body surface on the next orbit is extracted and stored, and based on the state data, the operation mode in the next orbit is determined and the radiation is determined. It has a main radiometer control unit for controlling the meter.

Also, the present invention provides an operation mode autonomous control radiometer in which a radiometer is mounted on an artificial satellite navigating around the celestial body, and the operation mode of the radiometer is autonomously controlled to observe the state of the surface of the celestial body in orbit. An imaging unit for imaging an orbit, a signal processing unit for extracting state data of a celestial body surface on a next orbit from data of the imaging unit, and a next processing unit based on the state data from the signal processing unit. An operation mode control unit that determines an operation mode in the orbit and controls the radiometer according to the operation mode.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit block diagram showing one embodiment of the present invention. FIG. 2 is a diagram for explaining a situation in which the radiometer of this embodiment captures an image of the ground surface.

This operation mode autonomous control radiometer has a main radiometer 1 and a main radiometer control unit 2, and the main radiometer control unit 2
Scanning mirror 3, optical lens 4, detector 5, amplification circuit 7, A / D conversion circuit 8, signal extraction circuit 9, motor control circuit 10, main radiometer operation mode program creation circuit
11, a memory 12, a main radiometer operation mode control circuit 13,
The motor 14 is provided. Among these components, the scanning mirror 3, the optical lens 4, and the detector 5 constitute an imaging unit, and include an amplifier circuit.
7, an A / D conversion circuit 8, and a signal extraction circuit 9 constitute a signal processing unit, and a main radiometer operation mode program creation circuit 11, a memory 1
2. The main radiometer operation mode control circuit 13 forms an operation mode control unit.

The main radiometer 1 observes the state of the celestial body surface from an artificial satellite traveling around the celestial body, and achieves an observation mission.

The scanning mirror 3 reflects the incident light to the optical lens 4.
Further, the scanning mirror 3 is rotated by the motor 14 and turns the viewpoint on the next orbit.

The motor control circuit 10 uses the motor control signal 17
The control unit 14 receives the rotation angle information 16 from the motor 14 and sends it out to the A / D conversion circuit 8 and the signal extraction circuit 9 as a synchronization pulse 30.

The optical lens 4 focuses the light from the scanning mirror 3 on the detector 5 to form an image.

The detector 5 photoelectrically converts the image and sends it to the amplifier circuit 7 as an image signal.

The A / D conversion circuit 8 converts the analog signal from the amplifier circuit 7 into a digital signal and sends the digital signal to the signal extraction circuit 9.

The signal extraction circuit 9 includes a synchronization pulse 30 based on the rotation angle information 16.
Then, image data on the next orbit is extracted based on the latitude data 18 and transmitted to the main radiometer operation mode program creation circuit 11.

The main radiometer operation mode program creating circuit 11 stores a cloud discrimination standard, and compares this standard with the signal from the signal extraction circuit 9 to determine each of the latitudes of the main radiometer 1 in the next orbit. For example, the result of the ON / OFF determination of the corresponding operation mode is written to the memory 12.

The main radiometer operation mode control circuit 13 reads the information in the memory 12 when the satellite reaches the next orbit and, when the operation mode of the main radiometer 1 needs to be changed, the main radiometer 1 A change number, for example, an ON signal or an OFF signal is transmitted.

The main radiometer operation mode control circuit 13
Transmits 19 signals and receives command 15 from the ground. It also has a function to change the cloud reference and change the next orbit operation mode.

FIG. 2 shows a situation where the radiometer of this embodiment captures an image of the ground surface. The contents of the main radiometer control unit 2 are shown in FIG.

Satellite equipped with main radiometer 1 and main radiometer controller 2
20 is traveling in a satellite traveling direction 21.

The main radiometer 1 captures an image of the imaging range 22 based on the current orbit, and after one round of the earth, attempts to capture an image of the imaging range 23 based on the next orbit. At this time, on the current orbit, the imaging range is set by the scanning mirror 3 of the main radiometer controller 2.
When the cloud 24 is recognized based on the data acquired by 25,
In this range, the operation mode is changed, such as turning off the main radiometer 1 or looking at another direction.

Next, the operation of this embodiment will be described with reference to FIGS. The satellite 20 equipped with the main radiometer 1 and the main radiometer control 2 uses the main radiometer 1 to image the imaging range 22 based on the current orbit, and after one orbit around the earth, images the imaging range 23 based on the next orbit. I do. At this time, the scanning mirror 3 of the main radiometer control 2 obtains data on the ground surface of the imaging range 25 by the main radiometer control unit. The light from the ground surface
The light is incident on the main radiometer controller 2 as incident light. The incident light is reflected by the scanning mirror 3, collected by the optical lens 4, and forms an image on the detector 5. The detector 5 photoelectrically converts the image to an image signal. This image signal is amplified by the amplification circuit 7, converted into a digital signal by the A / D conversion circuit 8, and input to the signal extraction circuit 9. Signal extraction circuit 9
Extracts the image data on the next orbit based on the synchronization pulse and the latitude data 18 based on the rotation angle information 16 from the motor control circuit 10 and generates the main radiometer operation mode program creation circuit.
Send to 11. Main radiometer operation mode program creation circuit
Reference numeral 11 stores a criterion for determining the amount of cloud.
Data of the imaging range 25 by the main radiometer control unit from the cloud and clouds
From the data of 24, the operation mode of ON / OFF for each latitude of the imaging range 23 by the next orbit is determined, and
Write to 12. The main radiometer operation mode control circuit 13 controls on / off of the main radiometer 1 based on the data written in the memory 12.

In this embodiment, the criterion for the operation mode of the main radiometer is the cloud amount.
The present invention is also applicable to a case where an image of a changing object such as sea surface contamination is selectively captured.

〔The invention's effect〕

As described above, according to the present invention, by automatically selecting and imaging an area with a small amount of cloud on the orbit, not only the reference work for each orbit in the ground station is significantly reduced, but also There is an effect that useful image data can be obtained based on the criterion.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing one embodiment of the present invention, and FIG. 2 is a diagram for explaining a situation where the radiometer of FIG. 1 captures an image of the ground surface. DESCRIPTION OF SYMBOLS 1 ... Main radiometer 2 ... Main radiometer control part 3 ... Scanning mirror 4 ... Optical lens 5 ... Detector 9 ... Signal extraction circuit 11 ... Main radiation operation mode program creation circuit 12 ... Memory 13 …… Main radiometer operation mode control circuit

────────────────────────────────────────────────── ─── Continued from the front page (56) References JP-A-1-293300 (JP, A) JP-A-55-160877 (JP, A) JP-A-1-184410 (JP, A) JP-A-1-184410 186500 (JP, A) Japanese Utility Model Showa 23-23681 (JP, U) Japanese Utility Model Showa 52-15179 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B64G 1/66 B64G 1 / 10 G01W 1/08

Claims (2)

(57) [Claims] 1. An operation mode autonomous control radiometer in which a radiometer is mounted on an artificial satellite navigating around a celestial body, and an operation mode of the radiometer is autonomously controlled to observe a state of a celestial body surface in orbit. From the data taken on the next orbit, the state data of the celestial body surface on the next orbit is extracted and stored, and based on the state data, the operation mode in the next orbit is determined and An operation mode autonomous control radiometer having a main radiometer control unit that controls the radiometer. 2. An operation mode autonomous control radiometer in which a radiometer is mounted on an artificial satellite navigating around a celestial body, and an operation mode of the radiometer is autonomously controlled to observe a state of a surface of the celestial body in orbit. An imaging unit for imaging an orbit, a signal processing unit for extracting state data of a celestial body surface on a next orbit from data of the imaging unit, and a next processing unit based on the state data from the signal processing unit. An operation mode autonomous control radiometer comprising: an operation mode control unit that determines an operation mode in an orbit and controls the radiometer according to the operation mode.