Satellite-borne high-interception-probability high-precision positioning system and method

Abstract

The invention discloses a satellite-borne high-interception-probability high-precision positioning system and method. The system comprises an ultra-wideband wide-angle scanning main array, a plurality of ultra-wideband reconfigurable digital auxiliary arrays, an ultra-large instantaneous bandwidth measurement module, a wideband frequency conversion and high-resolution acquisition module, a reconstruction control module and a high-precision positioning processing module. According to the invention, S-Ku instantaneous full-band reconnaissance processing and high-precision positioning are realized, and burdens of a transmission bus and computing processing resources are greatly reduced. The method is suitable for a comprehensive multifunctional software-defined satellite load system, ultra-large instantaneous bandwidth and ultra-high interception probability receiving in an electronic reconnaissance task are achieved, and high-precision direction finding and positioning are carried out on a target. The transmission bus pressure and the calculation complexity of rear-end high-performance processing equipment are effectively reduced, the C-SWaP performance is improved, and the method has important military significance and economic value.

Description

Technical Field

[0001] The present invention belongs to the field of space-based information acquisition, and mainly relates to a satellite-borne high intercept probability and high-precision positioning system and method, which is based on a single-satellite interferometric direction-finding positioning system and can achieve high-probability interception of the S-Ku full-band and high-precision positioning of target radiation sources without increasing the burden of a transmission bus and back-end processing resources. Background Art

[0002] As an important part of national security and military reconnaissance, the reconnaissance and positioning system is widely used in intelligence collection, target monitoring and other fields, and plays a vital role in improving the country's comprehensive defense capabilities and information warfare level. Although the reconnaissance frequency band of the existing reconnaissance and positioning system can cover several or even dozens of octaves, such as 2 to 18 GHz, it still has certain limitations in interception capabilities. Specifically, in the face of complex and changeable electromagnetic environments and mixed multi-band signals, the instantaneous interception bandwidth of the reconnaissance and positioning system is often limited by the maximum spurious-free bandwidth of the microwave frequency conversion channel and the bottleneck of signal transmission and processing technology. The instantaneous reconnaissance and interception bandwidth of a single channel can only reach about 1 GHz. By splicing four channels, the instantaneous interception bandwidth can reach up to 4 GHz. Using ADCs with a bit number of 14 bits or more can achieve a higher dynamic range and excellent quantization signal-to-noise ratio, which also helps to capture more signal details and avoid information loss, thereby improving the accuracy of reconnaissance parameter measurement. Large bandwidth and high sampling rate will inevitably bring extremely heavy burdens to the transmission and processing of the back-end signals. Taking the 4GHz instantaneous interception bandwidth as an example, according to the Nyquist sampling theorem, the data rate of a single channel is 10GSPS×16bit=160Gbps. To achieve reconnaissance and positioning, at least nine channels are required to collect and process in parallel, and the data rate increases to 1.44Tbps. Such a high data rate brings a great waste of bus transmission and computing processing resources, because electronic reconnaissance signals are sparse in the time domain and frequency domain. If you want to intercept and locate the target within the working frequency band of 2 to 18GHz, the ultra-high redundant data rate of 5.76Tbps will have an even more extreme demand for transmission bus and computing processing resources, which is almost impossible to achieve under the current process and technical conditions. This also means that in a high-density signal environment, the current reconnaissance and positioning system can only traverse the entire working frequency band by time-sharing, and the system cannot effectively capture all target signals in the working frequency band at the same time, thereby reducing the accuracy and comprehensiveness of reconnaissance interception. Therefore, developing a satellite-borne reconnaissance and positioning system with a high probability of interception and precise positioning, and realizing lightweight and reasonable application of transmission bus and computing processing resources, is of great significance to improving my country's military reconnaissance capabilities and informationized combat level. Summary of the invention

[0003] The present invention proposes a satellite-borne high intercept probability and high-precision positioning system, which has a high intercept probability and can achieve precise positioning, so as to solve the problem of low accuracy and comprehensiveness of reconnaissance and interception in the above-mentioned prior art.

[0004] The present invention is achieved through the following technical solutions:

[0005] On the one hand, the present invention provides a satellite-borne high-probability of intercept and high-precision positioning system, comprising an ultra-wide bandwidth angular scanning main array, M ultra-wideband reconfigurable digital auxiliary arrays, an ultra-large instantaneous bandwidth measurement module, a broadband frequency conversion and high-resolution acquisition module, a reconstruction control module and a high-precision positioning processing module, M is an even number and M≥6, wherein:

[0006] The ultra-wide bandwidth angular scanning main array is used to passively receive the electromagnetic signal of the target radiation source and transmit the full-band target radiation source signal to the ultra-large instantaneous bandwidth measurement module or the broadband frequency conversion and high-resolution acquisition module through a single-pole double-throw switch;

[0007] The ultra-wideband reconfigurable digital auxiliary array is used to passively receive the electromagnetic signal of the target radiation source, complete the down-conversion of the target radiation source signal to the intermediate frequency analog signal, and achieve large dynamic, high resolution and high signal-to-noise ratio sampling of the intermediate frequency analog signal to obtain the intermediate frequency digital signal, which is sent to the high-precision positioning module through optical fiber; at the same time, the ultra-wideband reconfigurable digital auxiliary array also receives the spectrum measurement results sent by the reconstruction control module;

[0008] The ultra-large instantaneous bandwidth measurement module is used to receive the full-band target radiation source signal transmitted by the ultra-wide bandwidth angular scanning main array, complete the single-bit acquisition quantification and spectrum measurement of the target radiation source signal, and transmit the spectrum measurement result to the reconstruction control module through optical fiber;

[0009] The broadband frequency conversion and high-resolution acquisition module is used to down-convert the target radiation source signal received by the ultra-wide bandwidth angle scanning main array into an intermediate frequency analog signal, and to sample the intermediate frequency analog signal with large dynamic, high resolution and high signal-to-noise ratio to obtain an intermediate frequency digital signal, and transmit the intermediate frequency digital signal to the high-precision positioning processing module through optical fiber; at the same time, the broadband frequency conversion and high-resolution acquisition module also receives the spectrum measurement results sent by the reconstruction control module;

[0010] The reconstruction control module configures the operating frequency and bandwidth of M ultra-wideband reconfigurable digital auxiliary arrays and the frequency and bandwidth configurable frequency conversion channels based on the spectrum measurement results output by the ultra-large instantaneous bandwidth measurement module;

[0011] The high-precision positioning processing module can achieve high-precision direction finding and positioning of land, sea, air and space targets based on the interferometric direction finding and positioning algorithm by fusing the intermediate frequency digital signals of the target radiation source received by the ultra-wide bandwidth angular scanning main array and M ultra-wideband reconfigurable digital auxiliary arrays.

[0012] On the other hand, the present invention provides a satellite-borne high probability of intercept and high precision positioning method, based on the satellite-borne high probability of intercept and high precision positioning system of the present invention, comprising the following steps:

[0013] Step 1: The ultra-wide bandwidth angular scanning main array passively receives the electromagnetic signal of the target radiation source and transmits the full-band target radiation source signal to the ultra-large instantaneous bandwidth measurement module through a single-pole double-throw switch. The ultra-large instantaneous bandwidth measurement module receives the signal transmitted by the ultra-wide bandwidth angular scanning main array, completes the single-bit acquisition quantization and spectrum measurement of the target radiation source signal, and transmits the spectrum measurement result to the reconstruction control module through optical fiber;

[0014] Step 2: Based on the spectrum measurement result output by the ultra-large instantaneous bandwidth measurement module, configure the operating frequency and bandwidth of M ultra-wideband reconfigurable digital auxiliary arrays and the frequency and bandwidth configurable frequency conversion channels;

[0015] Step 3: The broadband frequency conversion and high-resolution acquisition module down-converts the target radiation source signal received by the ultra-wide bandwidth angle scanning main array to the intermediate frequency L~S band, implements large dynamic, high resolution and high signal-to-noise ratio sampling to obtain an intermediate frequency digital signal, and transmits the intermediate frequency digital signal to the high-precision positioning processing module through optical fiber;

[0016] Step 4: The ultra-wideband reconfigurable digital auxiliary array passively receives the electromagnetic signal of the target radiation source, completes the down-conversion to the intermediate frequency L~S band, and implements large dynamic, high-resolution and high signal-to-noise ratio sampling, and sends the intermediate frequency digital signals of the target radiation source received by M ultra-wideband reconfigurable digital auxiliary arrays to the high-precision positioning processing module through optical fiber;

[0017] Step 5: Fuse the L-S frequency band intermediate frequency digital signals of the target radiation source received by the ultra-wide bandwidth angular scanning main array and the M ultra-wideband reconfigurable digital auxiliary arrays, and realize high-precision direction finding and positioning of land, sea, air and space targets based on the interferometric direction finding and positioning algorithm.

[0018] The advantages of the present invention compared with the prior art are:

[0019] Through the ultra-large instantaneous bandwidth measurement module, high-probability interception of the full-band survey is achieved, and the broadband frequency conversion and high-resolution acquisition modules cascaded with M ultra-wideband reconfigurable digital auxiliary arrays and ultra-wide bandwidth angular scanning main arrays are guided to achieve high-precision direction finding and positioning of targets within specific frequency bands and bandwidths. While ensuring the positioning accuracy, the instantaneous interception bandwidth is increased from the current conventional 1 to 4 GHz to 16 GHz full-band interception in the S to Ku bands, greatly improving the interception probability.

[0020] At the same time, the sparsity of electronic reconnaissance signals in the time and frequency domains is utilized. Under the condition of ensuring the interception probability and positioning accuracy, the ultra-high redundant data rate of several Tbps for full-band reconnaissance processing in the S-Ku band 16GHz is reduced to the order of hundreds of Gbps, greatly reducing the burden on the transmission bus and back-end computing processing resources.

[0021] The satellite-borne high probability of intercept and high-precision direction-finding and positioning system and method proposed in the present invention are significantly superior to traditional space-based information acquisition payload systems, have strong innovation and practicality, can effectively reduce the transmission bus pressure and computational complexity of the multi-functional integrated payload back-end high-performance computing and processing equipment, effectively improve its C-SWaP performance and its overall combat effectiveness, and have great military significance and important economic value.

[0022] The present invention realizes the detection and frequency measurement of key target radiation sources in the S-Ku frequency band through single-bit spectrum sensing and measurement. The frequency guidance information is transmitted through optical fiber to the broadband frequency conversion and high-resolution acquisition module cascaded by the ultra-wide bandwidth angle scanning main array and M ultra-wideband reconfigurable digital auxiliary arrays, and their working frequency and bandwidth are configured, and then a multi-bit acquisition quantization module is adopted to realize the large dynamic high-resolution acquisition and quantization of the target radiation source signal. Through optical fiber transmission, the intermediate frequency digital signals received by the ultra-wide bandwidth angle scanning main array and the M ultra-wideband reconfigurable digital auxiliary arrays are collected to the high-precision positioning processing module, and the interferometric direction finding positioning algorithm combined with the main and auxiliary arrays can be used to realize high-precision direction finding and positioning of land, sea and air and space targets. The present invention utilizes the sparsity of electronic reconnaissance signals in the time domain and frequency domain, which can not only achieve high-probability interception and high-precision positioning of targets, but also greatly reduce the burden of transmission bus and computing processing resources, and has strong practicality, and effectively improves the performance and cost-effectiveness of the reconnaissance and positioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a diagram of the architecture of the satellite-borne high probability of intercept and high precision positioning system of the present invention;

[0024] Figure 2 This is a working flow chart of the satellite-borne high probability of interception and high precision positioning system of the present invention. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] This embodiment provides a satellite-borne high-probability of intercept and high-precision positioning system, including an ultra-wide bandwidth angular scanning main array, 8 ultra-wideband reconfigurable digital auxiliary arrays, an ultra-large instantaneous bandwidth measurement module, a broadband frequency conversion and high-resolution acquisition module, a reconstruction control module and a high-precision positioning processing module, wherein:

[0027] The ultra-wide bandwidth angular scanning main array is composed of 24×24 2~18GHz ultra-wide bandwidth angular scanning array antennas. The 2~18GHz ultra-wide bandwidth angular scanning array antennas use strongly coupled overlapping dipoles to achieve 9 times the ultra-wide operating frequency band and ±45° wide angle scanning. The ultra-wide bandwidth angular scanning main array is used to passively receive the electromagnetic signal of the target radiation source and transmit the 2~18GHz full-band target radiation source signal to the ultra-large instantaneous bandwidth measurement module or the broadband frequency conversion and high-resolution acquisition module through a single-pole double-throw switch. The output signal power range is -80dBm to -20dBm;

[0028] The ultra-wideband reconfigurable digital auxiliary array consists of a 10×10 2~18GHz ultra-wide bandwidth angle scanning array antenna, a frequency and bandwidth configurable frequency conversion channel, and a 14-bit acquisition quantization module. Among them, the 2~18GHz ultra-wide bandwidth angle scanning array antenna adopts strongly coupled overlapping dipoles to passively receive electromagnetic signals from the target radiation source, achieving a 9-fold ultra-wide operating frequency band and ±45° wide angle scanning; the frequency and bandwidth configurable frequency conversion channel adopts a high local oscillator secondary superheterodyne frequency conversion mode; the 14-bit acquisition quantization module adopts the UltraScale+RFSoC Gen3 XCZU47DR chip, with a single-channel sampling rate of up to 5GSPS and an alias-free sampling bandwidth of up to 2000MHz. The ultra-wideband reconfigurable digital auxiliary array is used to passively receive the electromagnetic signal of the target radiation source, complete the down-conversion of the target radiation source signal to the intermediate frequency 1.8GHz±500MHz, and implement large dynamic, high-resolution and high signal-to-noise ratio sampling to obtain the intermediate frequency digital signal, which is sent to the high-precision positioning module through optical fiber; at the same time, the ultra-wideband reconfigurable digital auxiliary array also receives the spectrum measurement results sent by the reconstruction control module;

[0029] The ultra-large instantaneous bandwidth measurement module is composed of a 2-18 GHz limiting amplification module, a single-bit acquisition quantification module, and a spectrum sensing and measurement module; the ultra-large instantaneous bandwidth measurement module is used to receive the 2-18 GHz full-band target radiation source signal transmitted by the ultra-wide bandwidth angle scanning main array, complete the single-bit acquisition quantification and spectrum measurement of the target radiation source signal, and transmit the spectrum measurement result to the reconstruction control module through optical fiber;

[0030] The broadband frequency conversion and high-resolution acquisition module is composed of a frequency and bandwidth configurable frequency conversion channel and a 14-bit acquisition quantization module. The frequency and bandwidth configurable frequency conversion channel adopts a high local oscillator secondary superheterodyne frequency conversion method; the 14-bit acquisition quantization module adopts the UltraScale+RFSoC Gen3 XCZU47DR chip, with a single-channel sampling rate of up to 5GSPS and an aliasing-free sampling bandwidth of up to 2000MHz. The broadband frequency conversion and high-resolution acquisition module is used to down-convert the target radiation source signal received by the ultra-wide bandwidth angular scanning main array to an intermediate frequency of 1.8GHz±500MHz, and implement large dynamic, high-resolution, and high-signal-to-noise ratio sampling of the intermediate frequency analog signal to obtain an intermediate frequency digital signal, and transmit the intermediate frequency digital signal to the high-precision positioning processing module through optical fiber; at the same time, the broadband frequency conversion and high-resolution acquisition module also receives the spectrum measurement results sent by the reconstruction control module;

[0031] The reconstruction control module configures 8 ultra-wideband reconfigurable digital auxiliary arrays and frequency and bandwidth configurable frequency conversion channels based on the spectrum measurement result 2502.3MHz output by the ultra-large instantaneous bandwidth measurement module, sets its operating frequency band to 2-3.5GHz, covering (2502.3±500)MHz, and adjusts the frequency and bandwidth configurable frequency conversion channels in the 8 ultra-wideband reconfigurable digital auxiliary arrays, broadband frequency conversion and high-resolution acquisition modules to have a first oscillator operating frequency of 24.5023GHz and a second local oscillator operating frequency of 23.8GHz, so that the target radiation source signal with a frequency of 2502.3MHz is down-converted to a frequency band of 1.8GHz±500MHz;

[0032] The high-precision positioning processing module, by fusing the intermediate frequency digital signals of the target radiation source received by the ultra-wide bandwidth angular scanning main array (connected by a single-pole double-throw switch) and 8 ultra-wideband reconfigurable digital auxiliary arrays, can achieve high-precision direction finding and positioning of land, sea, and air and space targets based on the interferometric direction finding and positioning algorithm. The positioning accuracy of land and sea targets is better than 4km, and the positioning accuracy of air and space targets is better than 14km.

[0033] As a preferred implementation of the present invention, the ultra-large instantaneous bandwidth measurement module includes the following submodules:

[0034] (1) A 2-18 GHz frequency band limiting amplifier module is used to limit the power of the RF signal output by the 24×24 ultra-wide bandwidth angle scanning main array (i.e., the 2-18 GHz full-band target radiation source signal) to -15 to -5 dBm, and output it to the single-bit acquisition quantization module;

[0035] (2) Single-bit acquisition and quantization module, which adopts an 8-channel interleaved architecture and a sampling rate of up to 40 GSPS, is used to receive the signal output by the 2-18 GHz frequency band limiting amplifier module and perform single-bit acquisition and quantization of the instantaneous full frequency band of 2-18 GHz;

[0036] (3) The spectrum sensing and measurement module is composed of a Virtex UltraScale+VU13P FPGA and NOR FLASH. Since the sample values ​​of the measured signal are only 0 and 1, the kernel function is simplified to 1, -1, j and -j. The single-bit FFT algorithm without multiplication operation is used in the FPGA to measure the signal spectrum in the full frequency range of 2 to 18 GHz, and the spectrum measurement result 2502.3 MHz is transmitted to the reconstruction control module through optical fiber. It has been measured that the output frequency of the spectrum sensing and measurement module in the 2 to 18 GHz frequency band is 2502.3 MHz, the frequency measurement time is 98ns, and the frequency measurement accuracy is 2.3 MHz.

[0037] As a preferred implementation of the present invention, the working method of the broadband frequency conversion and high-resolution acquisition module is as follows:

[0038] (1) The target radiation source signal received by the ultra-wide bandwidth angular scanning main array is down-converted to 1.8 GHz ± 500 MHz through a high local oscillator secondary superheterodyne frequency conversion channel with an instantaneous bandwidth of 1000 MHz;

[0039] (2) For the intermediate frequency analog signal in the range of 1.8 GHz ± 500 MHz, a high dynamic range, high resolution and high signal-to-noise ratio sampling and quantization is achieved through a 14-bit, 5 GSPS sampling rate to obtain an intermediate frequency digital signal;

[0040] (3) The intermediate frequency digital signal is transmitted to the high-precision direction finding and positioning processing module via optical fiber.

[0041] As a preferred implementation of the present invention, the working method of 8 ultra-wideband reconfigurable digital auxiliary arrays is as follows:

[0042] (1) Using a 10×10-scale 2-18 GHz ultra-wide bandwidth angle scanning array antenna to passively receive electromagnetic signals from target radiation sources;

[0043] (2) Down-convert to 1.8 GHz ± 500 MHz through a high local oscillator secondary superheterodyne frequency conversion channel with an instantaneous bandwidth of 1000 MHz;

[0044] (3) The intermediate frequency analog signal in the range of 1.8 GHz ± 500 MHz is sampled and quantized with a large dynamic range, high resolution and high signal-to-noise ratio at a sampling rate of 14 bits and 5 GSPS to obtain an intermediate frequency digital signal;

[0045] (4) The intermediate frequency digital signals output by the eight ultra-wideband reconfigurable digital auxiliary arrays are transmitted to the high-precision positioning processing module via optical fiber.

[0046] Example:

[0047] like Figure 2As shown, this embodiment provides a working method of a satellite-borne high probability of interception and high precision positioning system, which specifically includes the following steps:

[0048] Step 1: The ultra-wide bandwidth angular scanning main array passively receives the electromagnetic signal of the target radiation source and transmits the full-band target radiation source signal to the ultra-large instantaneous bandwidth measurement module or the broadband frequency conversion and high-resolution acquisition module through a single-pole double-throw switch; the ultra-large instantaneous bandwidth measurement module receives the signal transmitted by the ultra-wide bandwidth angular scanning main array, completes the single-bit acquisition quantization and spectrum measurement of the target radiation source signal, and transmits the spectrum measurement result to the reconstruction control module through optical fiber;

[0049] Step 2: Based on the spectrum measurement result output by the ultra-large instantaneous bandwidth measurement module, configure the operating frequency and bandwidth of 8 ultra-wideband reconfigurable digital auxiliary arrays and the frequency and bandwidth configurable frequency conversion channels;

[0050] Step 3: The broadband frequency conversion and high-resolution acquisition module down-converts the target radiation source signal received by the ultra-wide bandwidth angle scanning main array to the intermediate frequency L~S band, implements large dynamic, high resolution and high signal-to-noise ratio sampling to obtain an intermediate frequency digital signal, and transmits the intermediate frequency digital signal to the high-precision positioning processing module through optical fiber;

[0051] Step 4: The ultra-wideband reconfigurable digital auxiliary array passively receives the electromagnetic signal of the target radiation source, completes the down-conversion to the intermediate frequency L~S band, and implements large dynamic, high-resolution and high signal-to-noise ratio sampling, and sends the intermediate frequency digital signal of the target radiation source received by the 8 ultra-wideband reconfigurable digital auxiliary arrays to the high-precision positioning processing module through optical fiber;

[0052] Step 5: Fuse the intermediate frequency digital signals of the target radiation source received by the ultra-wide bandwidth angular scanning main array and the eight ultra-wideband reconfigurable digital auxiliary arrays, and realize high-precision direction finding and positioning of the target radiation source based on the interferometric direction finding and positioning algorithm.

[0053] This implementation case is only a specific implementation method of the present invention. According to the system's requirements for the target radiation source reconnaissance performance and positioning accuracy, planar phased array antennas operating in different frequency bands and of different types can be selected. According to changes in the orbital height of the reconnaissance satellite and the power of the received target radiation source, the number of antenna units constituting the ultra-wideband angular scanning main array and the ultra-wideband reconfigurable digital auxiliary array can be increased or decreased. According to the needs of the instantaneous intercept probability, the instantaneous bandwidth of the ultra-wideband reconfigurable digital auxiliary array and the broadband frequency conversion and high-resolution acquisition module can be increased or decreased. According to the requirements of positioning accuracy, the number of sub-arrays of the ultra-wideband reconfigurable digital auxiliary array can be increased or decreased.

[0054] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

[0055] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A satellite-borne high probability of intercept and high precision positioning system, characterized in that: It includes an ultra-wide bandwidth angular scanning main array, M ultra-wideband reconfigurable digital auxiliary arrays, an ultra-large instantaneous bandwidth measurement module, a broadband frequency conversion and high-resolution acquisition module, a reconstruction control module and a high-precision positioning processing module, where M is an even number and M≥6, wherein: The ultra-wide bandwidth angular scanning main array is used to passively receive the electromagnetic signal of the target radiation source and transmit the full-band target radiation source signal to the ultra-large instantaneous bandwidth measurement module or the broadband frequency conversion and high-resolution acquisition module through a single-pole double-throw switch; The ultra-wideband reconfigurable digital auxiliary array is used to passively receive the electromagnetic signal of the target radiation source, complete the down-conversion of the target radiation source signal to the intermediate frequency analog signal, and achieve large dynamic, high resolution and high signal-to-noise ratio sampling of the intermediate frequency analog signal to obtain the intermediate frequency digital signal, which is sent to the high-precision positioning module through optical fiber; at the same time, the ultra-wideband reconfigurable digital auxiliary array also receives the spectrum measurement results sent by the reconstruction control module; The ultra-large instantaneous bandwidth measurement module is used to receive the full-band target radiation source signal transmitted by the ultra-wide bandwidth angular scanning main array, complete the single-bit acquisition quantification and spectrum measurement of the target radiation source signal, and transmit the spectrum measurement result to the reconstruction control module through optical fiber; The broadband frequency conversion and high-resolution acquisition module is used to down-convert the target radiation source signal received by the ultra-wide bandwidth angle scanning main array into an intermediate frequency analog signal, and to sample the intermediate frequency analog signal with large dynamic, high resolution and high signal-to-noise ratio to obtain an intermediate frequency digital signal, and transmit the intermediate frequency digital signal to the high-precision positioning processing module through optical fiber; at the same time, the broadband frequency conversion and high-resolution acquisition module also receives the spectrum measurement results sent by the reconstruction control module; The reconstruction control module configures the operating frequency and bandwidth of M ultra-wideband reconfigurable digital auxiliary arrays and the frequency and bandwidth configurable frequency conversion channels based on the spectrum measurement results output by the ultra-large instantaneous bandwidth measurement module; The high-precision positioning processing module can achieve high-precision direction finding and positioning of land, sea, air and space targets based on the interferometric direction finding and positioning algorithm by fusing the intermediate frequency digital signals of the target radiation source received by the ultra-wide bandwidth angular scanning main array and M ultra-wideband reconfigurable digital auxiliary arrays.

2. The satellite-borne high probability of intercept and high precision positioning system according to claim 1, characterized in that: The ultra-wide bandwidth angular scanning main array is composed of an S-Ku band ultra-wide bandwidth angular scanning array antenna of Q×Q scale, where Q is a positive integer and Q≥1. The S-Ku band ultra-wide bandwidth angular scanning array antenna adopts strongly coupled overlapping dipoles to achieve a 9-fold ultra-wide operating frequency band and ±45° wide angle scanning.

3. The satellite-borne high probability of intercept and high precision positioning system according to claim 1, characterized in that: The ultra-wideband reconfigurable digital auxiliary array is composed of a P×P-scale S-Ku frequency band ultra-wide bandwidth angle scanning array antenna, a frequency and bandwidth configurable frequency conversion channel and a K-bit acquisition quantization module, where P is a positive integer and P≥1, and K is a positive integer and K≥12; wherein the S-Ku frequency band ultra-wide bandwidth angle scanning array antenna adopts strongly coupled overlapping dipoles to passively receive electromagnetic signals from target radiation sources, thereby realizing a 9-fold ultra-wide operating frequency band and ±45° wide angle scanning; the frequency and bandwidth configurable frequency conversion channel adopts a high local oscillator secondary superheterodyne frequency conversion mode; the K-bit acquisition quantization module adopts a high-performance RFSoC chip, the single-channel sampling rate is not less than 2GSPS, and the aliasing-free sampling bandwidth is not less than 1000MHz.

4. The satellite-borne high probability of intercept and high precision positioning system according to claim 3, characterized in that: The working method of the ultra-wideband reconfigurable digital auxiliary array is as follows: (1) Using a P×P-scale S-Ku band ultra-wide bandwidth angle scanning array antenna to passively receive electromagnetic signals from target radiation sources; (2) Down-converting to the L-S frequency band through a high local oscillator secondary superheterodyne frequency conversion channel with an instantaneous bandwidth of not less than 1000 MHz; (3) The intermediate frequency analog signal in the L-S frequency band is sampled and quantized by K bits and a sampling rate of no less than 2 GSPS to achieve high dynamic range, high resolution, and high signal-to-noise ratio, thereby obtaining an intermediate frequency digital signal; (4) The intermediate frequency digital signals output by the M ultra-wideband reconfigurable digital auxiliary arrays are transmitted to the high-precision positioning processing module through optical fiber.

5. The satellite-borne high probability of intercept and high precision positioning system according to claim 1, characterized in that: The ultra-large instantaneous bandwidth measurement module comprises: (1) The S-Ku band limiting amplifier module is used to limit the power of the target radiation source signal output by the Q×Q scale ultra-wide bandwidth angle scanning main array to I-J dBm, where I and J are real numbers and satisfy -20≤I≤J≤0, and output it to the single-bit acquisition quantization module; (2) A single-bit acquisition and quantization module, which adopts a multi-channel interleaved architecture and a sampling rate of not less than 32 GSPS, is used to receive the signal output by the S-Ku band limiting amplifier module and perform single-bit acquisition and quantization of the instantaneous full-band S-Ku band; (3) Spectrum sensing and measurement module, consisting of a high-performance FPGA and NOR FLASH.

6. The satellite-borne high probability of intercept and high precision positioning system according to claim 1, characterized in that: The broadband frequency conversion and high-resolution acquisition module is composed of a frequency and bandwidth configurable frequency conversion channel and a K-bit acquisition quantization module, wherein the frequency and bandwidth configurable frequency conversion channel adopts a high local oscillator secondary superheterodyne frequency conversion method; the K-bit acquisition quantization module adopts a high-performance RFSoC chip, the single-channel sampling rate is not less than 2GSPS, and the aliasing-free sampling bandwidth is not less than 1000MHz.

7. The satellite-borne high probability of intercept and high precision positioning system according to claim 6, characterized in that: The working method of the broadband frequency conversion and high-resolution acquisition module is as follows: (1) Down-convert the target radiation source signal received by the ultra-wide bandwidth angular scanning main array to the L-S frequency band through a high local oscillator secondary superheterodyne frequency conversion channel with an instantaneous bandwidth of not less than 1000 MHz; (2) The intermediate frequency analog signal in the L-S frequency band is sampled and quantized by K bits and a sampling rate of no less than 2 GSPS to achieve high dynamic range, high resolution, and high signal-to-noise ratio, thereby obtaining an intermediate frequency digital signal; (3) The intermediate frequency digital signal is transmitted to the high-precision positioning processing module via optical fiber.

8. A satellite-borne high probability of interception and high precision positioning method, characterized in that: The satellite-borne high probability of interception and high precision positioning system according to any one of claims 1 to 7 comprises the following steps: Step 1: The ultra-wide bandwidth angular scanning main array passively receives the electromagnetic signal of the target radiation source and transmits the full-band target radiation source signal to the ultra-large instantaneous bandwidth measurement module through a single-pole double-throw switch. The ultra-large instantaneous bandwidth measurement module receives the signal transmitted by the ultra-wide bandwidth angular scanning main array, completes the single-bit acquisition quantization and spectrum measurement of the target radiation source signal, and transmits the spectrum measurement result to the reconstruction control module through optical fiber; Step 2: Based on the spectrum measurement result output by the ultra-large instantaneous bandwidth measurement module, configure the operating frequency and bandwidth of M ultra-wideband reconfigurable digital auxiliary arrays and the frequency and bandwidth configurable frequency conversion channels; Step 3: The broadband frequency conversion and high-resolution acquisition module down-converts the target radiation source signal received by the ultra-wide bandwidth angle scanning main array to the intermediate frequency L~S band, implements large dynamic, high resolution and high signal-to-noise ratio sampling to obtain an intermediate frequency digital signal, and transmits the intermediate frequency digital signal to the high-precision positioning processing module through optical fiber; Step 4: The ultra-wideband reconfigurable digital auxiliary array passively receives the electromagnetic signal of the target radiation source, completes the down-conversion to the intermediate frequency L~S band, implements large dynamic, high-resolution and high signal-to-noise ratio sampling, and sends the intermediate frequency digital signals of the target radiation source received by M ultra-wideband reconfigurable digital auxiliary arrays to the high-precision positioning processing module through optical fiber; Step 5: Fuse the L-S frequency band intermediate frequency digital signals of the target radiation source received by the ultra-wide bandwidth angular scanning main array and the M ultra-wideband reconfigurable digital auxiliary arrays, and realize high-precision direction finding and positioning of the target radiation source based on the interferometric direction finding and positioning algorithm.

Images