Spaceborne millimeter-wave search-tracking-high resolution generalized ISAR imaging radar system

Abstract

The present invention discloses a spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system, which includes a signal processor, a radio frequency transceiver unit, a traveling wave tube amplifier, a circulator, an antenna, a limiting low-noise amplifier, and a power supply and distribution unit. The present invention can overcome the deficiency of the existing space maintenance optical imaging's dependence on illumination conditions, and achieve the detection and imaging of non-cooperative targets by the space maintenance radar; the system uses a unified transmitting link and receiving link to transmit and receive narrowband and broadband imaging signals. Through the signal processor, 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 are generated by one-way DAC time-sharing. The narrowband detection signal and the broadband imaging signal share the link, which reduces the volume and weight of the product, has the advantages of low power consumption and small heat dissipation, and reduces the engineering development cost and difficulty.

Description

Technical Field

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

[0002] At present, existing spaceborne non-cooperative target imaging technologies at home and abroad do not have the ability of backlight imaging. Most of them use optical cameras to perform high-resolution imaging of targets in the direction of the light, and close-range observation is required to obtain centimeter-level resolution, resulting in problems such as the dependence of existing space maintenance optical imaging on lighting conditions. Summary of the Invention

[0003] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system, which overcomes the deficiency of the existing space maintenance optical imaging's dependence on lighting conditions, and realizes the detection and imaging of non-cooperative targets such as failed satellites by the space maintenance radar.

[0004] To solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0005] A spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system includes:

[0006] A signal processor, which 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 at different times, and has 3 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 gains of the radio frequency unit; it is also connected to the traveling-wave tube amplifier to output pulse modulation signals 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 working instructions and telemetry, and complete the target search, tracking, and ISAR imaging processing of the intermediate-frequency echo signals.

[0007] A radio frequency transceiver unit, which is used to perform up-conversion and frequency multiplication on the received intermediate-frequency narrowband signals, broadband imaging signals, and broadband local oscillator signals to generate radio frequency narrowband search signals or radio frequency broadband imaging signals, and input them into the traveling-wave tube amplifier; at the same time, it is connected to the limiter low-noise amplifier to convert the input 3-way radio frequency echo signals from radio frequency to intermediate frequency, and output the intermediate-frequency echo signals to the 3 ADC channels of the signal processor for digital acquisition.

[0008] A traveling-wave tube amplifier, which is used to amplify the power of the input radio frequency narrowband search signal or radio frequency broadband imaging signal, and output a high-power radio frequency transmission signal.

[0009] The circulator is connected to the traveling wave tube amplifier, the antenna, and the limiting low-noise amplifier, and connects the high-power RF 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;

[0010] The antenna completes the spatial directional radiation of the high-power RF 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;

[0011] The limiting low-noise amplifier is connected to the RF transceiver unit and is used to limit and low-noise amplify the sum beam port echo signal, the elevation difference beam port echo signal, and the azimuth difference beam port echo signal and output them to the RF transceiver unit.

[0012] The present invention further includes the following technical features:

[0013] Specifically, the system further 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 the external primary power input 1 and convert it into secondary power to supply power to the signal processor, the RF transceiver unit, and the limiting low-noise amplifier.

[0014] Specifically, the traveling wave tube amplifier is powered by the external primary power input 2.

[0015] Specifically, the signal processor only uses one DAC to generate the intermediate frequency narrowband signal, the intermediate frequency wideband imaging signal, the intermediate frequency point frequency local oscillator signal, and the intermediate frequency wideband local oscillator signal in a time-sharing manner, and the generated intermediate frequency narrowband signal, intermediate frequency wideband imaging signal, intermediate frequency point frequency local oscillator signal, and intermediate frequency wideband local oscillator signal are all in pulse form.

[0016] Specifically, the intermediate frequency narrowband signal, the intermediate frequency wideband imaging signal, the intermediate frequency point frequency local oscillator signal, and the intermediate frequency wideband local oscillator signal generated by the signal processor in a time-sharing manner are generated in the time-sharing order of the intermediate frequency narrowband signal, the intermediate frequency point frequency local oscillator signal, the intermediate frequency wideband imaging signal, and the intermediate frequency wideband local oscillator signal, and then repeat in turn.

[0017] Specifically, the RF transceiver unit generates a large-bandwidth RF wideband imaging signal for the intermediate frequency wideband imaging signal input by the signal processor through an upconverter, a filter, and a frequency multiplier.

[0018] Specifically, the intermediate frequency narrowband signal and the intermediate frequency wideband imaging signal are connected through the same link and hardware from being generated by the signal processor to the spatial directional radiation of the antenna.

[0019] Specifically, the sum beam port receives the target narrowband echo signal and the broadband imaging echo signal in a time-sharing manner;

[0020] Both narrowband and broadband radar echo signals for the search, tracking, and imaging of sum beam ports are amplified by the same low-noise limiter amplifier, filtered by the RF transceiver unit, down-converted, amplified, and collected and processed by the ADC of the signal processor.

[0021] Specifically, 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.

[0022] Specifically, the system operates in the millimeter-wave band. Radar signals for search, tracking, and imaging are generated at intermediate frequency by the signal processor DAC, and are filtered, modulated, and frequency-multiplied by the RF transceiver unit to generate RF search, tracking, and imaging radar transmission signals.

[0023] Compared with the prior art, the present invention has the following technical effects:

[0024] The present invention uses a single spaceborne radar to achieve target search, tracking, and high-resolution generalized ISAR imaging; directly generates intermediate-frequency signals in the form of digital-to-analog converters, and generates large-bandwidth imaging signals through multiple frequency multiplications; uses the same DAC 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 digital time-sharing manner.

[0025] The system of the present invention uses a unified transmit link and receive link to transmit and receive narrowband and broadband imaging signals. The typical feature is that the signal processor uses one DAC 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. The narrowband detection signals and broadband imaging signals share the link, reducing the volume and weight of the product, having the advantages of low power consumption and small heat dissipation, and reducing the engineering development cost and difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a block diagram of a spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] 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 and the resolution is the same at different distances, and the imaging does not require illumination conditions; the microwave generalized ISAR tracking imaging radar system can operate at a distance of thousands of kilometers and has the ability of centimeter-level imaging at long distances; the proposed new microwave high-resolution tracking imaging system has the characteristics of digitalization, integration, high resolution, and long distance. At present, this technology has been applied to the design of microwave tracking ISAR imaging systems and has been successfully applied.

[0028] 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.

[0029] Example:

[0030] like Figure 1 As shown, this embodiment provides a spaceborne millimeter-wave search-tracking-high-resolution generalized ISAR imaging radar system, including:

[0031] 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;

[0032] 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;

[0033] 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;

[0034] 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;

[0035] 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;

[0036] 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.

[0037] 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.

[0038] The traveling wave tube amplifier is powered by an external primary power input 2.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] The beam port receives the target narrowband echo signal and the broadband imaging echo signal in time sharing;

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] The preferred embodiments of the present invention have been 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 scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0049] In addition, it should be noted that, in the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present invention will not separately describe various possible combination manners.

[0050] Furthermore, any combination can be made among various different embodiments of the present invention, as long as it does not violate the idea of the present invention, and it should also be regarded as the content 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, 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.

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 the 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.

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