A spaceborne high-interception-probability high-precision positioning system and method

Abstract

The application discloses a kind of spaceborne high-interception-probability high-precision positioning system and method, system includes ultra-wideband wide-angle scanning main array, multiple ultra-wideband reconfigurable digitization auxiliary array, super large instantaneous bandwidth measurement module, wideband frequency conversion and high-resolution acquisition module, reconfiguration control module and high-precision positioning processing module.The application realizes S~Ku instantaneous full-band reconnaissance processing and high-precision positioning, and greatly reduces the burden of transmission bus and computing processing resource.The application is suitable for comprehensive multi-functional software-defined satellite payload system, realizes ultra-large instantaneous bandwidth and super-high-interception-probability reception in electronic reconnaissance task, and carries out high-precision direction finding positioning to target.Effective reduction of the transmission bus pressure and computational complexity of back-end high-performance processing equipment improves C-SWaP performance, and has important military significance and economic value.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of space-based information acquisition, and mainly relates to a space-borne high-interception-probability high-precision positioning system and method, which is based on a single-satellite interference direction-finding positioning system, and can realize high-probability interception and high-precision positioning of target radiation sources in the S-Ku full-band under the condition of not increasing the burden of transmission buses and back-end processing resources. BACKGROUND

[0002] As an important part of national security and military reconnaissance, the reconnaissance positioning system is widely used in the fields of intelligence collection and target monitoring, and plays a vital role in improving the comprehensive defense capability and informationized combat level of the country. Although the existing reconnaissance positioning system can cover several or even dozens of frequency ranges, such as 2-18 GHz, it still has certain limitations in interception capability. Specifically, when facing complex and variable electromagnetic environments and mixed multi-band signals, the instantaneous interception bandwidth of the reconnaissance positioning system is often limited by the maximum non-dispersive bandwidth of the microwave frequency channel and the bottleneck of signal transmission and processing technology. The instantaneous reconnaissance interception bandwidth of a single channel can only reach about 1 GHz. Through the splicing of four channels, the instantaneous interception bandwidth can reach a maximum of 4 GHz. The use of ADCs with 14-bit or more can achieve a high dynamic range and excellent quantization signal-to-noise ratio, which also helps to capture more signal details and avoid information loss, thereby improving the precision of reconnaissance parameter measurement. A large bandwidth and high sampling rate will inevitably bring a heavy burden to the transmission and processing of the back-end signal. Taking a 4 GHz instantaneous interception bandwidth as an example, according to the Nyquist sampling theorem, the data rate of a single channel is 10 GSPS x 16 bit = 160 Gbps. If the reconnaissance positioning is to be realized, at least nine or more channels are needed for parallel acquisition and processing, and the data rate increases to 1.44 Tbps. Such a high data rate brings a great waste of transmission buses and computing resources, because electronic reconnaissance signals are sparse in time and frequency domains. If the target is to be intercepted and positioned within the working frequency range of 2-18 GHz, the demand for transmission buses and computing resources will be even more extreme with a 5.76 Tbps ultra-high redundancy data rate, which is almost impossible to achieve under the current technology and technical conditions. This also means that in a high-density signal environment, the current reconnaissance positioning system can only traverse the entire working frequency range by time-sharing, and the system cannot effectively capture all target signals within the working frequency range at the same time, thereby reducing the accuracy and comprehensiveness of reconnaissance interception. Therefore, it is of great significance to develop a space-borne reconnaissance positioning system with high interception probability and precise positioning, and to realize the light-weighted and reasonable application of transmission buses and computing resources, for improving the military reconnaissance capability and informationized combat level of our country. SUMMARY

[0003] The application provides a satellite-borne high-interception-probability high-precision positioning system, which has high interception probability and can realize accurate positioning, so as to solve the problem of low accuracy and comprehensiveness of reconnaissance interception in the prior art.

[0004] The application is realized by the following technical scheme:

[0005] In one aspect, the application provides a satellite-borne high-interception-probability high-precision positioning system, which comprises an ultra-wideband wide-angle scanning main array, M 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, M is an even number and M is greater than or equal to 6, wherein:

[0006] The ultra-wideband wide-angle scanning main array is used for passively receiving electromagnetic signals of a target radiation source and transmitting full-band target radiation source signals to the ultra-large instantaneous bandwidth measurement module or the wideband frequency conversion and high-resolution acquisition module through a single-pole double-throw switch.

[0007] The ultra-wideband reconfigurable digital auxiliary array is used for passively receiving electromagnetic signals of a target radiation source, completing down-conversion of the target radiation source signals to intermediate frequency analog signals, realizing high-resolution sampling of the intermediate frequency analog signals with high dynamic range and high signal-to-noise ratio to obtain intermediate frequency digital signals, and sending the intermediate frequency digital signals to the high-precision positioning module through an optical fiber; meanwhile, the ultra-wideband reconfigurable digital auxiliary array also receives spectrum measurement results sent by the reconstruction control module.

[0008] The ultra-large instantaneous bandwidth measurement module is used for receiving full-band target radiation source signals transmitted by the ultra-wideband wide-angle scanning main array, completing single-bit acquisition quantization and spectrum measurement of the target radiation source signals, and transmitting the spectrum measurement results to the reconstruction control module through an optical fiber.

[0009] The wideband frequency conversion and high-resolution acquisition module is used for down-converting target radiation source signals received by the ultra-wideband wide-angle scanning main array to intermediate frequency analog signals, realizing high-resolution sampling of the intermediate frequency analog signals with high dynamic range and high signal-to-noise ratio to obtain intermediate frequency digital signals, and transmitting the intermediate frequency digital signals to the high-precision positioning processing module through an optical fiber; meanwhile, the wideband frequency conversion and high-resolution acquisition module also receives spectrum measurement results sent by the reconstruction control module.

[0010] The reconstruction control module configures working frequencies and bandwidths of the M ultra-wideband reconfigurable digital auxiliary arrays and 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 realizes high-precision direction finding positioning of land, sea and space targets by fusing target radiation source intermediate frequency digital signals received by the ultra-wideband wide-angle scanning main array and the M ultra-wideband reconfigurable digital auxiliary arrays and based on an interference direction finding positioning algorithm.

[0012] In another aspect, the present application provides a spaceborne high-interception-probability high-precision positioning method based on the spaceborne high-interception-probability high-precision positioning system of the present application, comprising the following steps:

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

[0014] Step 2: Based on the spectrum measurement results output by the ultra-large instantaneous bandwidth measurement module, the working frequency and bandwidth of the M ultra-wideband reconfigurable digitization auxiliary arrays and the frequency and bandwidth configurable frequency conversion channels are configured;

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

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

[0017] Step 5: The L-S band intermediate frequency digital signals of the target radiation source received by the ultra-wideband wide-angle scanning main array and the M ultra-wideband reconfigurable digitization auxiliary arrays are fused, and based on the interferometric direction finding positioning algorithm, high-precision direction finding positioning of land, sea and space targets is realized.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] The ultra-large instantaneous bandwidth measurement module realizes full-band general survey high-probability interception, and guides the wideband frequency conversion and high-resolution acquisition module of the cascade of the M ultra-wideband reconfigurable digitization auxiliary arrays and the ultra-wideband wide-angle scanning main array to realize high-precision direction finding positioning of the target in a specific frequency band and bandwidth; under the condition of ensuring positioning accuracy, the instantaneous interception bandwidth is increased from the current conventional 1-4 GHz to the full-band S-Ku band 16 GHz interception, greatly improving the interception probability.

[0020] Meanwhile, the sparsity of the electronic reconnaissance signal in the time domain and the frequency domain is utilized, the data rate of the S-Ku band 16GHz full-band reconnaissance processing is reduced to the order of hundreds of Gbps under the condition of ensuring the interception probability and the positioning accuracy, and the burden of the transmission bus and the backend computing processing resource is greatly reduced.

[0021] The satellite high-interception-probability high-precision positioning system and method have obvious advantages over the traditional space-based information acquisition load system, have strong innovation and practicality, can effectively reduce the transmission bus pressure and the computing complexity of the high-performance computing processing equipment of the multifunctional integrated load, effectively improve the C-SWaP performance and the overall combat effectiveness, and have great military significance and important economic value.

[0022] The single-bit spectrum sensing and measurement are used to realize the detection and frequency measurement of the key target radiation source in the S-Ku band. The frequency guide information is transmitted to the wideband frequency conversion and high-resolution acquisition module and the M super-wideband reconfigurable digitization auxiliary array of the ultra-wideband wide-angle scanning main array through the optical fiber, the working frequency and the bandwidth are configured, and then the multi-bit acquisition quantization module is used to realize the large-dynamic high-resolution acquisition quantization of the target radiation source signal. The intermediate frequency digital signals received by the ultra-wideband wide-angle scanning main array and the M super-wideband reconfigurable digitization auxiliary array are collected to the high-precision positioning processing module through the optical fiber transmission, and the interference direction finding positioning algorithm combining the main auxiliary array can realize the high-precision direction finding positioning of the land, sea and space target. The sparsity of the electronic reconnaissance signal in the time domain and the frequency domain is utilized, high-probability interception and high-precision positioning of the target can be realized, the burden of the transmission bus and the computing processing resource is greatly reduced, the system has strong practicality, and the performance and the cost-performance ratio of the reconnaissance positioning system are effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the satellite high-interception-probability high-precision positioning system architecture diagram of the application;

[0024] Figure 2 is the satellite high-interception-probability high-precision positioning system working flow diagram of the application. DETAILED DESCRIPTION

[0025] The application will be described in detail below with reference to the drawings and specific embodiments.

[0026] The embodiment provides a satellite high-interception-probability high-precision positioning system, which comprises an ultra-wideband wide-angle scanning main array, eight super-wideband reconfigurable digitization auxiliary arrays, an ultra-large instantaneous bandwidth measurement module, a wideband frequency conversion and high-resolution acquisition module, a reconfiguration control module and a high-precision positioning processing module, and wherein:

[0027] The ultra-wideband angle scanning main array is composed of 2-18 GHz ultra-wideband angle scanning array antennas with a size of 24x24. The 2-18 GHz ultra-wideband angle scanning array antennas adopt strongly coupled overlapping dipoles to realize 9 times frequency range ultra-wide working frequency band and ±45° wide angle scanning. The ultra-wideband angle scanning main array is used for passively receiving electromagnetic signals of a target radiation source and transmitting 2-18 GHz full-band target radiation source signals to an ultra-large instantaneous bandwidth measurement module or a wideband frequency conversion and high-resolution acquisition module through a single-pole double-throw switch. The output signal power range is-80 dBm to-20 dBm.

[0028] The ultra-wideband reconfigurable digitization auxiliary array is composed of 2-18 GHz ultra-wideband angle scanning array antennas with a size of 10x10, a frequency and bandwidth configurable frequency conversion channel, and a 14-bit acquisition quantization module. The 2-18 GHz ultra-wideband angle scanning array antennas adopt strongly coupled overlapping dipoles to passively receive electromagnetic signals of a target radiation source, realize 9 times frequency range ultra-wide working frequency band and ±45° wide angle scanning, and adopt a high local oscillator twice superheterodyne frequency conversion mode. The 14-bit acquisition quantization module adopts an UltraScale+RFSoC Gen3 XCZU47DR chip, and the single-channel sampling rate can reach 5 GSPS, and the aliasing sampling bandwidth can reach 2000 MHz. The ultra-wideband reconfigurable digitization auxiliary array is used for passively receiving electromagnetic signals of a target radiation source, down-converts the target radiation source signals to intermediate frequency 1.8 GHz±500 MHz, realizes large dynamic high-resolution high signal-to-noise ratio sampling to obtain intermediate frequency digital signals, and sends the intermediate frequency digital signals to a high-precision positioning module through an optical fiber. At the same time, the ultra-wideband reconfigurable digitization auxiliary array also receives frequency spectrum measurement results sent by a reconstruction control module.

[0029] The ultra-large instantaneous bandwidth measurement module is composed of 2-18 GHz limiting amplification modules, single-bit acquisition quantization modules, and frequency spectrum sensing and measurement modules. The ultra-large instantaneous bandwidth measurement module is used for receiving 2-18 GHz full-band target radiation source signals transmitted by the ultra-wideband angle scanning main array, completing single-bit acquisition quantization and frequency spectrum measurement of the target radiation source signals, and transmitting frequency spectrum measurement results to the reconstruction control module through an optical fiber.

[0030] The wideband 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, wherein the frequency and bandwidth configurable frequency conversion channel adopts a high local oscillator twice superheterodyne frequency conversion mode; the 14-bit acquisition quantization module adopts an UltraScale+RFSoC Gen3 XCZU47DR chip, and the single-channel sampling rate can reach 5GSPS, and the aliasing-free sampling bandwidth can reach 2000MHz. The wideband frequency conversion and high-resolution acquisition module is used for down-converting the target radiation source signal received by the ultra-wideband wide-angle scanning main array to an intermediate frequency of 1.8GHz±500MHz, and realizing large dynamic high-resolution high signal-to-noise ratio sampling on the intermediate frequency analog signal to obtain an intermediate frequency digital signal. The intermediate frequency digital signal is transmitted to the high-precision positioning processing module through an optical fiber; at the same time, the wideband frequency conversion and high-resolution acquisition module also receives the frequency spectrum measurement result sent by the reconstruction control module;

[0031] The reconstruction control module configures 8 ultra-wideband reconfigurable digitized auxiliary arrays and frequency and bandwidth configurable frequency conversion channels based on the frequency spectrum measurement result 2502.3MHz output by the ultra-large instantaneous bandwidth measurement module, sets the working frequency band of the 8 ultra-wideband reconfigurable digitized auxiliary arrays and the frequency and bandwidth configurable frequency conversion channel in the wideband frequency conversion and high-resolution acquisition module to 2-3.5GHz, covers (2502.3±500)MHz, adjusts the one local oscillator working frequency of the 8 ultra-wideband reconfigurable digitized auxiliary arrays and the frequency and bandwidth configurable frequency conversion channel in the wideband frequency conversion and high-resolution acquisition module to 24.5023GHz, and the two local oscillator working frequencies to 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 fuses the intermediate frequency digital signals of the target radiation source received by the ultra-wideband wide-angle scanning main array (connected through a single-pole double-throw switch) and the 8 ultra-wideband reconfigurable digitized auxiliary arrays, and realizes high-precision direction finding positioning of land, sea and space targets based on an interference direction finding positioning algorithm, wherein the positioning accuracy of the land and sea targets is better than 4km, and the positioning accuracy of the space targets is better than 14km.

[0033] As a preferred implementation manner of the application, the ultra-large instantaneous bandwidth measurement module comprises the following sub-modules:

[0034] (1) A 2-18GHz frequency band limiting amplification module is used for limiting and amplifying the radio frequency signal (i.e. a 2-18GHz full-band target radiation source signal) output by a 24*24 scale ultra-wideband wide-angle scanning main array to-15 to-5dBm, and outputting the radio frequency signal to a single-bit acquisition quantization module;

[0035] (2) A single-bit acquisition quantization module adopts an 8-channel interleaving architecture and a sampling rate of up to 40GSPS, and is used for receiving the signal output by the 2-18GHz frequency band limiting amplification module and performing 2-18GHz instantaneous full-band single-bit acquisition quantization;

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

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

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

[0039] (2) 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 through a 14-bit, 5GSPS 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 through an optical fiber.

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

[0042] (1) A 10x10 scale 2-18 GHz ultra-wideband angle scanning array antenna is used to passively receive target radiation source electromagnetic signals;

[0043] (2) Down-converted to 1.8 GHz±500 MHz through a high local oscillator secondary superheterodyne 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 through a 14-bit, 5GSPS sampling rate to obtain an intermediate frequency digital signal;

[0045] (4) The intermediate frequency digital signals output by the 8 ultra-wideband reconfigurable digitized auxiliary arrays are transmitted to the high-precision direction finding and positioning processing module through an optical fiber.

[0046] Embodiment:

[0047] As Figure 2As shown, the embodiment gives the working method of the spaceborne high-interception-probability high-precision positioning system, and specifically includes the following steps:

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

[0049] Step 2: Based on the spectrum measurement results output by the ultra-large instantaneous bandwidth measurement module, the working frequency and bandwidth of the 8 ultra-wideband reconfigurable digitization auxiliary arrays and the frequency and bandwidth configurable frequency conversion channels are configured;

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

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

[0052] Step 5: The target radiation source intermediate frequency digital signals received by the ultra-wideband wide-angle scanning main array and the 8 ultra-wideband reconfigurable digitization auxiliary arrays are fused, and high-precision direction finding positioning of the target radiation source is realized based on the interference direction finding positioning algorithm.

[0053] The embodiment case is only one specific implementation manner of the present application, and according to the requirements of the system on the target radiation source reconnaissance performance and the positioning precision, a planar phased array antenna working in different frequency bands and different types can be selected. According to the changes of the orbit height of the reconnaissance satellite and the received target radiation source power, the number of antenna units of the ultra-wideband wide-angle scanning main array and the ultra-wideband reconfigurable digitization auxiliary array can be increased or reduced. According to the needs of the instantaneous interception probability, the instantaneous bandwidth of the ultra-wideband reconfigurable digitization auxiliary array and the wideband frequency conversion and high-resolution acquisition module can be increased or reduced. According to the requirements of the positioning precision, the number of sub-arrays of the ultra-wideband reconfigurable digitization auxiliary array can be increased or reduced.

[0054] The contents not described in detail in the specification of the present application are the known technologies of those skilled in the art.

[0055] Although the present application has been disclosed with reference to the preferred embodiments, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications to the technical solutions of the present application using the disclosed methods and technical contents without departing from the spirit and scope of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application without departing from the technical solutions of the present application shall fall within the protection scope of the technical solutions of the present application.

Claims

1. A spaceborne high probability of intercept and high precision positioning system, characterized in that, Including ultra-wide bandwidth wide-angle scanning main array, M The system includes an ultra-wideband reconfigurable digital auxiliary array, an ultra-large instantaneous bandwidth measurement module, a broadband frequency conversion and high-resolution acquisition module, a reconfiguration control module, and a high-precision positioning processing module. M Even number and M ≥6, of which: The ultra-wide bandwidth scanning main array is used to passively receive the electromagnetic signals of the target radiation source and transmit the electromagnetic signals of the target radiation source 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 electromagnetic signals from the target radiation source, down-convert the electromagnetic signals from the target radiation source to intermediate frequency analog signals, and perform large dynamic range, high resolution, and high signal-to-noise ratio sampling on the intermediate frequency analog signals to obtain intermediate frequency digital signals, which are then sent to the high-precision positioning processing module via optical fiber. At the same time, the ultra-wideband reconfigurable digital auxiliary array also receives spectrum measurement results sent by the reconfiguration control module. The ultra-large instantaneous bandwidth measurement module is used to receive the electromagnetic signal of the target radiation source transmitted by the ultra-wide bandwidth angle scanning main array, complete the single-bit acquisition, quantization and spectrum measurement of the electromagnetic signal of the target radiation source, and transmit the spectrum measurement results to the reconstruction control module through optical fiber; The broadband frequency conversion and high-resolution acquisition module is used to downconvert the electromagnetic signal of the target radiation source received by the ultra-wide bandwidth angle scanning main array to an intermediate frequency analog signal, and to perform large dynamic range, high resolution and high signal-to-noise ratio sampling on the intermediate frequency analog signal to obtain an intermediate frequency digital signal. The intermediate frequency digital signal is then transmitted 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 control module is reconfigured based on the spectrum measurement results output by the ultra-large instantaneous bandwidth measurement module. M A super-wideband reconfigurable digital auxiliary array and a frequency and bandwidth configurable variable frequency channel with adjustable operating frequency and bandwidth; The high-precision positioning processing module integrates an ultra-wide bandwidth wide-angle scanning main array and... M The target radiation source intermediate frequency digital signal received by an ultra-wideband reconfigurable digital auxiliary array, based on an interferometric direction finding and positioning algorithm, can achieve high-precision direction finding and positioning of the target radiation source.

2. The spaceborne high probability of intercept and high precision positioning system as described in claim 1, characterized in that, The ultra-wide bandwidth angle scanning main array is composed of Q × Q It consists of a large-scale S-Ku band ultra-wide bandwidth angle scanning array antenna. Q are positive integers and Q The ≥1, S~Ku band ultra-wide bandwidth angle scanning array antenna uses a strongly coupled overlapping dipole to achieve an ultra-wide operating frequency band of 9 octaves and ±45° wide angle scanning.

3. The spaceborne high probability of intercept and high precision positioning system as described in claim 1, characterized in that, The ultra-wideband reconfigurable digital auxiliary array is composed of P × P Large-scale S-Ku band ultra-wide bandwidth angle-scanning array antennas, with configurable frequency and bandwidth conversion channels and K The bit acquisition and quantization module consists of... P are positive integers and P ≥1, K are positive integers and K ≥12; Among them, the S~Ku band ultra-wide bandwidth angle scanning array antenna adopts a strongly coupled overlapping dipole to passively receive the electromagnetic signals of the target radiation source, realizing a 9-octave ultra-wide operating frequency band and ±45° wide angle scanning; the frequency and bandwidth configurable frequency conversion channel adopts a high local oscillator double superheterodyne frequency conversion mode; K The bit acquisition and quantization module uses a high-performance RFSoC chip with a single-channel sampling rate of no less than 2GSPS and an anti-aliasing sampling bandwidth of no less than 1000MHz.

4. The spaceborne high probability of intercept and high precision positioning system as described in claim 3, characterized in that, The working method of the ultra-wideband reconfigurable digital auxiliary array is as follows: (1) Adopt P × P A large-scale S-Ku band ultra-wide bandwidth angle scanning array antenna passively receives electromagnetic signals from target radiation sources; (2) Down-convert to L~S frequency band through a high local oscillator secondary superheterodyne frequency converter channel with an instantaneous bandwidth of not less than 1000MHz; (3) For intermediate frequency analog signals in the L-S frequency band range, via K A sampling rate of at least 2 GSPS is used to achieve large dynamic range, high resolution, and high signal-to-noise ratio sampling and quantization to obtain intermediate frequency digital signals. (4) Transmitted via optical fiber M The intermediate frequency digital signal output by an ultra-wideband reconfigurable digital auxiliary array is transmitted to the high-precision positioning processing module.

5. The spaceborne high probability of intercept and high precision positioning system as described in claim 1, characterized in that, The ultra-large instantaneous bandwidth measurement module includes: (1) S-Ku band limiting amplifier module, used to limit the amplitude of the band amplitude. Q × Q The electromagnetic signal of the target radiation source output by the ultra-wide bandwidth scanning main array is amplified to a power-limited value. I~J dBm, I, J It is a real number and satisfies -20 ≤ I ≤ J ≤0, output to the single-bit acquisition and quantization module; (2) Single-bit acquisition and quantization module, which adopts a multi-channel interleaving architecture and a sampling rate of not less than 32GSPS, is used to receive the signal output by the S-Ku band limiting amplifier module and perform instantaneous full-band single-bit acquisition and quantization in the S-Ku band; (3) The spectrum sensing and measurement module consists of a high-performance FPGA and NOR FLASH.

6. The spaceborne high probability of intercept and high precision positioning system as described in claim 1, characterized in that, The broadband frequency conversion and high-resolution acquisition module consists of frequency and bandwidth configurable frequency conversion channels and K The system consists of a bit acquisition and quantization module, in which the frequency and bandwidth configurable frequency conversion channel adopts a high local oscillator double superheterodyne frequency conversion method; K The bit acquisition and quantization module uses a high-performance RFSoC chip with a single-channel sampling rate of no less than 2GSPS and an anti-aliasing sampling bandwidth of no less than 1000MHz.

7. The spaceborne high probability of intercept and high precision positioning system as described in claim 6, characterized in that, The working method of the broadband frequency conversion and high-resolution acquisition module is as follows: (1) The electromagnetic signal of the target radiation source received by the ultra-wide bandwidth angle scanning main array is down-converted to the L~S frequency band through a high local oscillator secondary superheterodyne frequency conversion channel with an instantaneous bandwidth of not less than 1000MHz; (2) For intermediate frequency analog signals in the L-S frequency band range, via K A sampling rate of at least 2 GSPS is used to achieve large dynamic range, high resolution, and high signal-to-noise ratio sampling and quantization to obtain intermediate frequency digital signals. (3) The intermediate frequency digital signal is transmitted to the high-precision positioning processing module through optical fiber.

8. A spaceborne high-probability-of-interception, high-precision positioning method, characterized in that, The spaceborne high probability of intercept high-precision positioning system according to any one of claims 1-7 includes the following steps: Step 1: The ultra-wide bandwidth angle scanning main array passively receives the electromagnetic signal of the target radiation source and transmits the electromagnetic signal of the target radiation source 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 angle scanning main array, completes the single-bit acquisition quantization and spectrum measurement of the electromagnetic signal of the target radiation source, and transmits the spectrum measurement result to the reconstruction control module through optical fiber. Step 2: Based on the spectrum measurement results output by the ultra-large instantaneous bandwidth measurement module, configure... M A super-wideband reconfigurable digital auxiliary array and a frequency and bandwidth configurable variable frequency channel with adjustable operating frequency and bandwidth; Step 3: The broadband frequency conversion and high-resolution acquisition module downconverts the electromagnetic signal of the target radiation source received by the ultra-wide bandwidth angle scanning main array to the intermediate frequency L~S band, and performs large dynamic range, high resolution and high signal-to-noise ratio sampling to obtain the intermediate frequency digital signal. The intermediate frequency digital signal is then transmitted to the high-precision positioning processing module through optical fiber. Step 4: The ultra-wideband reconfigurable digital auxiliary array passively receives the electromagnetic signal from the target radiation source, performs down-conversion to the intermediate frequency L-S band, and achieves large dynamic range, high resolution, and high signal-to-noise ratio sampling. M The intermediate frequency digital signal of the target radiation source received by the ultra-wideband reconfigurable digital auxiliary array is transmitted to the high-precision positioning processing module through optical fiber. Step 5, fuse the ultra-wide bandwidth angle scanning main array and M A super-wideband reconfigurable digital auxiliary array receives the intermediate frequency digital signal of the target radiation source in the L-S band. Based on the interferometric direction finding and positioning algorithm, high-precision direction finding and positioning of the target radiation source is achieved.

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