Satellite-borne millimeter wave searching-tracking-high-resolution generalized ISAR (inverse synthetic aperture radar) imaging radar system

Abstract

The invention discloses a satellite-borne millimeter wave searching-tracking-high-resolution generalized ISAR imaging radar system which comprises a signal processor, a radio frequency transceiving unit, a traveling wave tube amplifier, a circulator, an antenna, an amplitude limiting low noise amplifier and a power supply and distribution unit. According to the invention, the defect that the existing spatial maintenance optical imaging depends on illumination conditions can be overcome, and the detection and imaging of the spatial maintenance radar on the non-cooperative target can be realized; the system adopts a unified transmitting link and a receiving link to transmit and receive narrowband and broadband imaging signals, a DAC (Digital-to-Analog Converter) generates an intermediate-frequency narrowband signal, an intermediate-frequency broadband imaging signal, an intermediate-frequency dot frequency local oscillation signal and an intermediate-frequency broadband local oscillation signal in a time-sharing manner through a signal processor, and a narrowband detection signal and a broadband imaging signal share a link. The volume and the weight of the product are reduced, the power consumption is low, the heat consumption is low, and the engineering development cost and difficulty are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of space maintenance services and relates to a satellite-borne millimeter wave search-tracking-high-resolution generalized ISAR imaging radar system. Background Art

[0002] At present, the existing satellite-borne non-cooperative target imaging technologies at home and abroad do not have the ability to image against the light. Most of them use optical cameras to perform high-resolution imaging of the target in the direction of the light, and close-range observations are required to obtain centimeter-level resolution. This leads to problems such as the dependence of existing space maintenance optical imaging on lighting conditions. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a space-borne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system to overcome the deficiency of existing space maintenance optical imaging in dependence on lighting conditions and to achieve detection and imaging of non-cooperative targets such as failed satellites by space maintenance radar.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems: A spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system, comprising: The signal processor is used to generate intermediate frequency narrowband signals, intermediate frequency broadband imaging signals, intermediate frequency point frequency local oscillator signals and intermediate frequency broadband local oscillator signals in a time-sharing manner, and has three ADC channels to collect intermediate frequency echo signals of the radio frequency transceiver unit; it is connected to the radio frequency transceiver unit to control the transmission and reception gain of the radio frequency unit; it is also connected to the traveling wave tube amplifier to output a pulse modulation signal to control the pulse working time of the traveling wave tube amplifier; and it has a 422 bus to communicate with the external control platform for work instructions and telemetry, and completes intermediate frequency echo signal target search, tracking and ISAR imaging processing; The RF transceiver unit is used to up-convert and multiply the received intermediate frequency narrowband signal, broadband imaging signal and broadband local oscillator signal to generate an RF narrowband search signal or an RF broadband imaging signal, and input the signal into the traveling wave tube amplifier; at the same time, it is connected to the limiting low noise amplifier to convert the input 3-channel RF echo signal from RF to intermediate frequency, and output the intermediate frequency echo signal to the 3-channel ADC channel of the signal processor for digital acquisition; A traveling wave tube amplifier is used to amplify the power of an input RF narrowband search signal or RF broadband imaging signal and output a RF high-power transmission signal; The circulator is connected with the traveling wave tube amplifier, the antenna and the limiting low noise amplifier, connects the radio frequency high-power transmission signal input by the traveling wave tube amplifier to the antenna and the beam port, and connects the target and beam echo signals input by the antenna and the beam port to the limiting low noise amplifier; The antenna completes the spatial directional radiation of the RF high-power signal, is connected to the limiting low-noise amplifier, and outputs the elevation difference beam port echo signal and the azimuth difference beam port echo signal to the limiting low-noise amplifier; The limiting low noise amplifier is connected to the RF transceiver unit and is used to limit and low-noise amplify the echo signal of the sum beam port, the echo signal of the elevation difference beam port and the echo signal of the azimuth difference beam port and output them to the RF transceiver unit.

[0005] The present invention also includes the following technical features: Specifically, the system also includes a power supply and distribution unit, which is connected to the signal processor, the RF transceiver unit and the limiting low noise amplifier, can receive an external primary power input 1 and convert it into a secondary power supply to distribute power to the signal processor, the RF transceiver unit and the limiting low noise amplifier.

[0006] Specifically, the traveling wave tube amplifier is powered by an external primary power input 2 .

[0007] Specifically, the signal processor uses only one DAC to time-share generate an intermediate frequency narrowband signal, an intermediate frequency broadband imaging signal, an intermediate frequency point-frequency local oscillator signal and an intermediate frequency broadband local oscillator signal, and the generated intermediate frequency narrowband signal, intermediate frequency broadband imaging signal, intermediate frequency point-frequency local oscillator signal and intermediate frequency broadband local oscillator signal are all in pulse form.

[0008] Specifically, the signal processor generates the intermediate frequency narrowband signal, the intermediate frequency broadband imaging signal, the intermediate frequency point frequency local oscillator signal and the intermediate frequency broadband local oscillator signal in a time-sharing manner, and the time-sharing generation order is the intermediate frequency narrowband signal, the intermediate frequency point frequency local oscillator signal, the intermediate frequency broadband imaging signal, the intermediate frequency broadband local oscillator signal, and then repeats in sequence.

[0009] Specifically, the radio frequency transceiver unit generates a large-bandwidth radio frequency broadband imaging signal through an up-converter, a filter and a frequency multiplier for the intermediate frequency broadband imaging signal input from the signal processor.

[0010] Specifically, the intermediate frequency narrowband signal and the intermediate frequency broadband imaging signal are connected through the same link and hardware from generation by the signal processor to spatial directional radiation by the antenna.

[0011] Specifically, the beam port receives the target narrowband echo signal and the broadband imaging echo signal in a time-sharing manner; The narrowband and broadband radar echo signals for searching, tracking and imaging of the beam port are collected and processed by the same limiting low noise amplifier, RF transceiver unit filtering, down conversion, amplification and signal processor ADC.

[0012] Specifically, the target narrowband echo signal and the broadband imaging echo signal are received from the antenna and the port to the signal processor through the same link and hardware connection.

[0013] Specifically, the system operates in the millimeter wave frequency band. The radar signals used for search, tracking and imaging are generated at the intermediate frequency through the signal processor DAC, and the RF search, tracking and imaging radar transmission signals are generated through filtering, modulation and frequency multiplication by the RF transceiver unit.

[0014] Compared with the prior art, the present invention has the following technical effects: The present invention adopts a satellite-borne radar to realize target search, tracking, and high-resolution generalized ISAR imaging; adopts a digital-to-analog converter to directly generate an intermediate frequency signal, and generates a large-bandwidth imaging signal by multiple frequency multiplication; and adopts the same DAC to digitally time-share generate an intermediate frequency narrowband signal, an intermediate frequency broadband imaging signal, an intermediate frequency point-frequency local oscillator signal, and an intermediate frequency broadband local oscillator signal.

[0015] The system of the present invention adopts a unified transmitting link and receiving link to transmit and receive narrowband and broadband imaging signals. The typical feature is that a signal processor and a DAC are used to time-share generate intermediate frequency narrowband signals, intermediate frequency broadband imaging signals, intermediate frequency point frequency local oscillator signals and intermediate frequency broadband local oscillator signals. The narrowband detection signal and the broadband imaging signal share a link, which reduces the volume and weight of the product, has the advantages of low power consumption and low heat consumption, and reduces the cost and difficulty of engineering development. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a block diagram of the spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system. DETAILED DESCRIPTION

[0017] The present invention provides a millimeter wave search-tracking-high-resolution generalized ISAR imaging radar system. Microwave radar imaging has the advantages that the resolution is not affected by distance, the resolution is the same at different distances, and the imaging has no requirements on illumination conditions. The microwave generalized ISAR tracking imaging radar system has a working distance of up to one thousand kilometers and has a long-distance centimeter-level imaging capability. The proposed new microwave high-resolution tracking imaging system has the characteristics of digitization, integration, high resolution and long distance. At present, the technology has been applied to the design of microwave tracking ISAR imaging system and has been successfully applied.

[0018] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0019] Example: like Figure 1 As shown, this embodiment provides a spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system, including: The signal processor is used to generate intermediate frequency narrowband signals, intermediate frequency broadband imaging signals, intermediate frequency point frequency local oscillator signals and intermediate frequency broadband local oscillator signals in a time-sharing manner, and has three ADC channels to collect intermediate frequency echo signals of the radio frequency transceiver unit; it is connected to the radio frequency transceiver unit to control the transmission and reception gain of the radio frequency unit; it is also connected to the traveling wave tube amplifier to output a pulse modulation signal to control the pulse working time of the traveling wave tube amplifier; and it has a 422 bus to communicate with the external control platform for work instructions and telemetry, and completes intermediate frequency echo signal target search, tracking and ISAR imaging processing; The RF transceiver unit is used to up-convert and multiply the received intermediate frequency narrowband signal, broadband imaging signal and broadband local oscillator signal to generate an RF narrowband search signal or an RF broadband imaging signal, and input the signal into the traveling wave tube amplifier; at the same time, it is connected to the limiting low noise amplifier to convert the input 3-channel RF echo signal from RF to intermediate frequency, and output the intermediate frequency echo signal to the 3-channel ADC channel of the signal processor for digital acquisition; A traveling wave tube amplifier is used to amplify the power of an input RF narrowband search signal or RF broadband imaging signal and output a RF high-power transmission signal; The circulator is connected with the traveling wave tube amplifier, the antenna and the limiting low noise amplifier, connects the radio frequency high-power transmission signal input by the traveling wave tube amplifier to the antenna and the beam port, and connects the target and beam echo signals input by the antenna and the beam port to the limiting low noise amplifier; The antenna completes the spatial directional radiation of the RF high-power signal, is connected to the limiting low-noise amplifier, and outputs the elevation difference beam port echo signal and the azimuth difference beam port echo signal to the limiting low-noise amplifier; The limiting low noise amplifier is connected to the RF transceiver unit and is used to limit and low-noise amplify the echo signal of the sum beam port, the echo signal of the elevation difference beam port and the echo signal of the azimuth difference beam port and output them to the RF transceiver unit.

[0020] The system also includes a power supply and distribution unit, which is connected to the signal processor, the RF transceiver unit and the limiting low noise amplifier, and can receive an external primary power input 1 and convert it into a secondary power supply to distribute power to the signal processor, the RF transceiver unit and the limiting low noise amplifier.

[0021] The traveling wave tube amplifier is powered by an external primary power input 2.

[0022] The signal processor uses only one DAC to generate an intermediate frequency narrowband signal, an intermediate frequency broadband imaging signal, an intermediate frequency point frequency local oscillator signal and an intermediate frequency broadband local oscillator signal in a time-sharing manner. The generated intermediate frequency narrowband signal, intermediate frequency broadband imaging signal, intermediate frequency point frequency local oscillator signal and intermediate frequency broadband local oscillator signal are all in pulse form.

[0023] The signal processor generates an intermediate frequency narrowband signal, an intermediate frequency broadband imaging signal, an intermediate frequency point frequency local oscillator signal and an intermediate frequency broadband local oscillator signal in a time-sharing manner. The time-sharing generation order is the intermediate frequency narrowband signal, the intermediate frequency point frequency local oscillator signal, the intermediate frequency broadband imaging signal, the intermediate frequency broadband local oscillator signal, and then repeats in sequence.

[0024] The radio frequency transceiver unit generates a large-bandwidth radio frequency broadband imaging signal through an up-converter, a filter and a frequency multiplier for the intermediate frequency broadband imaging signal input by the signal processor.

[0025] The intermediate frequency narrowband signal and intermediate frequency broadband imaging signal are connected through the same link and hardware from the generation of the signal processor to the spatial directional radiation of the antenna.

[0026] The beam port receives the target narrowband echo signal and the broadband imaging echo signal in time sharing; The narrowband and broadband radar echo signals for searching, tracking and imaging of the beam port are collected and processed by the same limiting low noise amplifier, RF transceiver unit filtering, down conversion, amplification and signal processor ADC.

[0027] The target narrowband echo signal and broadband imaging echo signal are also connected from the antenna and port to the signal processor through the same link and hardware.

[0028] The signal processor is connected to the radio frequency transceiver unit to simultaneously control the transmission and reception gains of the radio frequency transceiver unit.

[0029] The system operates in the millimeter wave frequency band. The radar signals used for search, tracking and imaging are generated at the intermediate frequency through the signal processor DAC, and the RF search, tracking and imaging radar transmission signals are generated through filtering, modulation and frequency multiplication by the RF transceiver unit.

[0030] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0031] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0032] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system, characterized in that: include: The signal processor is used to generate intermediate frequency narrowband signals, intermediate frequency broadband imaging signals, intermediate frequency point frequency local oscillator signals and intermediate frequency broadband local oscillator signals in a time-sharing manner, and has three ADC channels to collect intermediate frequency echo signals of the radio frequency transceiver unit; it is connected to the radio frequency transceiver unit to control the transmission and reception gain of the radio frequency unit; it is also connected to the traveling wave tube amplifier to output a pulse modulation signal to control the pulse working time of the traveling wave tube amplifier; and it has a 422 bus to communicate with the external control platform for work instructions and telemetry, and completes intermediate frequency echo signal target search, tracking and ISAR imaging processing; The RF transceiver unit is used to up-convert and multiply the received intermediate frequency narrowband signal, broadband imaging signal and broadband local oscillator signal to generate an RF narrowband search signal or an RF broadband imaging signal, and input the signal into the traveling wave tube amplifier; at the same time, it is connected to the limiting low noise amplifier to convert the input 3-channel RF echo signal from RF to intermediate frequency, and output the intermediate frequency echo signal to the 3-channel ADC channel of the signal processor for digital acquisition; A traveling wave tube amplifier is used to amplify the power of an input RF narrowband search signal or RF broadband imaging signal and output a RF high-power transmission signal; The circulator is connected with the traveling wave tube amplifier, the antenna and the limiting low noise amplifier, connects the radio frequency high-power transmission signal input by the traveling wave tube amplifier to the antenna and the beam port, and connects the target and beam echo signals input by the antenna and the beam port to the limiting low noise amplifier; The antenna completes the spatial directional radiation of the RF high-power signal, is connected to the limiting low-noise amplifier, and outputs the elevation difference beam port echo signal and the azimuth difference beam port echo signal to the limiting low-noise amplifier; The limiting low noise amplifier is connected to the RF transceiver unit and is used to limit and low-noise amplify the echo signal of the sum beam port, the echo signal of the elevation difference beam port and the echo signal of the azimuth difference beam port and output them to the RF transceiver unit.

2. The spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system according to claim 1, characterized in that: The system also includes a power supply and distribution unit, which is connected to the signal processor, the RF transceiver unit and the limiting low noise amplifier, can receive an external primary power input 1 and convert it into a secondary power supply to distribute power to the signal processor, the RF transceiver unit and the limiting low noise amplifier.

3. The spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system according to claim 1, characterized in that: The traveling wave tube amplifier is powered by an external primary power input 2.

4. The spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system according to claim 1, characterized in that: The signal processor uses only one DAC to generate an intermediate frequency narrowband signal, an intermediate frequency broadband imaging signal, an intermediate frequency point frequency local oscillator signal and an intermediate frequency broadband local oscillator signal in a time-sharing manner, and the generated intermediate frequency narrowband signal, intermediate frequency broadband imaging signal, intermediate frequency point frequency local oscillator signal and intermediate frequency broadband local oscillator signal are all in pulse form.

5. The spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system according to claim 1, characterized in that: The signal processor generates an intermediate frequency narrowband signal, an intermediate frequency broadband imaging signal, an intermediate frequency point frequency local oscillator signal and an intermediate frequency broadband local oscillator signal in a time-sharing manner, and the time-sharing generation order is intermediate frequency narrowband signal, intermediate frequency point frequency local oscillator signal, intermediate frequency broadband imaging signal, intermediate frequency broadband local oscillator signal, and then repeats in sequence.

6. The spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system according to claim 1, characterized in that: The radio frequency transceiver unit generates a large-bandwidth radio frequency broadband imaging signal through an up-converter, a filter and a frequency multiplier for the intermediate frequency broadband imaging signal input from the signal processor.

7. The spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system according to claim 1, characterized in that: The intermediate frequency narrowband signal and the intermediate frequency broadband imaging signal are connected through the same link and hardware from being generated by the signal processor to being directionally radiated in the antenna space.

8. The spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system according to claim 1, characterized in that: The beam port receives the target narrowband echo signal and the broadband imaging echo signal in time sharing; The narrowband and broadband radar echo signals for searching, tracking and imaging of the beam port are collected and processed by the same limiting low noise amplifier, RF transceiver unit filtering, down conversion, amplification and signal processor ADC.

9. The spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system according to claim 8, characterized in that: The target narrowband echo signal and the broadband imaging echo signal are received from the antenna and port to the signal processor through the same link and hardware connection.

10. The spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system according to claim 1, characterized in that: The system operates in the millimeter wave frequency band. The radar signals used for search, tracking and imaging are generated at the intermediate frequency through the signal processor DAC, and the RF search, tracking and imaging radar transmission signals are generated through filtering, modulation and frequency multiplication by the RF transceiver unit.

Images