CN102253380B - Adaptive height measurement device - Google Patents
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- CN102253380B CN102253380B CN201110075950.7A CN201110075950A CN102253380B CN 102253380 B CN102253380 B CN 102253380B CN 201110075950 A CN201110075950 A CN 201110075950A CN 102253380 B CN102253380 B CN 102253380B
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Abstract
The invention relates to an adaptive height measurement device and belongs to the technical field of radar detection devices. The adaptive height measurement device consists of a four-in-one transceiver/receiver (T/R) component, a power division network, a multipath receiver, a multipath analog/digital sampling and digital down converter, an optical fiber rotary connector, a signal processing extension set, a constant false alarm detection board, a height measurement signal processing board and the like, wherein the four-in-one T/R component is connected with the multipath receiver and the multipath analog/digital (AD) sampling and digital down converter through the power division network, is connected with the signal processing extension set through an optical fiber, and is connected with the constant false alarm detection board and the height measurement signal processing board through a high speed bus. In the adaptive height measurement device, a lobe split, maximum likelihood and digital wave beam synthesis height measurement method can comprehensively be applied, so the elevation measurement range of a metrewave radar is expanded and the adaptive height measurement device is easy to operate and can work reliably. The problem that the lobe split, maximum likelihood and digital wave beam synthesis height measurement method cannot be comprehensively applied in the conventional metrewave radar can be solved, and powerful guarantee is provided for enhancing the height measurement precision of the metrewave radar in the whole air domain with low, middle and high elevations.
Description
Technical field:
The present invention relates to a kind of self-adaptation height measuring device, belong to radar detection apparatus technical field.
Background technology:
Metre wave radar is because its wavelength is longer, has its unique advantage at aspects such as anti-stealthy, anti-antiradiation missiles, is subject in recent years the generally attention of countries in the world, one after another development metre wave radar is put into the critical positions of radar-probing system.But the wave beam of metre wave radar is wider, after ground return, due to multipath effect impact, cause object height measuring accuracy lower, how to improve altitude measurement in VHF radar precision and be one of difficult problem that radar circle will solve.The high method of main survey that metre wave radar is taked at present has: lobe disintegrating method, maximum likelihood method and digital beam synthesize (DBF) method.
Survey in high method at above-mentioned three kinds, lobe disintegrating method and maximum likelihood method are surveyed the high low elevation angle district that can effectively solve and are surveyed high problem, but lobe disintegrating method is owing to there being the problem of " subregion is fuzzy " at the middle high elevation angle, and the altitude measurement in VHF radar method based on lobe division can only be surveyed high in low elevation coverage.Although it is wider that maximum likelihood method is suitable for angular range, lower at the low elevation angle pixel accuracy of antenna lobe division, and operand is larger.Digital beam synthetic (DBF) is surveyed height and is mainly used in the high processing of high-altitude survey, although operand is little, low-to-medium altitude multipath effect can cause more serious impact to its measuring accuracy.
As can be seen here, developing a kind of equipment that can fully utilize the high method of various surveys, for improving the altimetry precision of metre wave radar in whole spatial domain, is the problem that current altitude measurement in VHF radar field need solve.
Summary of the invention:
The object of the invention is to, a kind of altitude signal disposable plates that adopts is provided, can fully utilize the high method of various surveys, improve the altimetry precision of metre wave radar in whole spatial domain, overcome the deficiency that the high method of existing various survey exists, working stability is reliable, and altimetry precision is high, easy to operate self-adaptation height measuring device.
The present invention realizes above-mentioned purpose by following technical solution:
This self-adaptation height measuring device is by uhf band antenna array, four-in-one T/R assembly, power division network, multipath receiver, multi-channel A/D sampling and digital down converter, fiber rotation connector, signal is processed extension set, CFAR detection plate, altitude signal disposable plates, DSP digital signal processor, FPGA programmable logic device, high-speed chain crossing, dsp bus, FLASH flash memories, control interface, survey high Processing Algorithm assembly, SD synchronous DRAM, interface logic control circuit, data pre-process circuit, double port memory, three-state buffer, FIFO buffer forms, it is characterized in that: uhf band antenna array connects four-in-one T/R assembly by feeder line, four-in-one T/R assembly connects power division network by feeder line, the row power splitter of power division network is divided into seven tunnels and connects respectively multipath receiver, multipath receiver is connected with multi-channel A/D sampling and digital down converter, fiber rotation connector input end connects multi-channel A/D sampling and digital down converter through optical fiber, its output terminal connects signal through optical fiber and processes extension set, signal is processed extension set and is connected with CFAR detection plate by high-speed bus, and CFAR detection plate connects altitude signal disposable plates by high-speed bus.
Described altitude signal disposable plates is made up of four DSP digital signal processors, FPGA programmable logic device, high-speed chain crossing, dsp bus, FLASH flash memories; Four DSP digital signal processors by control interface, survey high Processing Algorithm assembly, SD synchronous DRAM composition; FPGA programmable logic device is by interface logic control circuit, data pre-process circuit, double port memory, three-state buffer; FIFO buffer composition; FPGA programmable logic device is connected with the DSP0 of DSP digital signal processor by dsp bus, DSP0 is connected with DSP1, DSP2, the DSP3 of DSP digital signal processor respectively by high-speed chain crossing, and DSP0 is connected with the FIFO buffer of FPGA programmable logic device by dsp bus.
The present invention's beneficial effect is compared with prior art:
This self-adaptation height measuring device adopts the altitude signal disposable plates being made up of FPGA programmable logic device and DSP digital signal processor, realizes low target, adopts lobe disintegrating method and maximum likelihood method to combine and processes; To medium altitude target, preferentially adopt maximum likelihood method to process; To high-altitude target, preferentially adopt DBF digital beam altimetry to process.When lobe disintegrating method and DBF digital beam altimetry result of calculation are when invalid, can adopt the high result of survey of maximum likelihood method.Through actual service test, greatly reduce operand, reduce the impact of low-to-medium altitude multipath effect on altimetry precision, effectively improve the altimetry precision of metre wave radar.Not only ensured the altimetry precision of metre wave radar in spatial domain, the basic, normal, high elevation angle, also expanded the measurement of elevation scope of radar, easy to operate, working stability is reliable, for the development of low-frequency range volumetric radar provides powerful guarantee technically.
Brief description of the drawings:
Fig. 1 is the principle of work block diagram of self-adaptation height measuring device;
Fig. 2 is the principle of work block diagram of the altitude signal disposable plates of self-adaptation height measuring device;
Fig. 3 is the altitude signal processing flow chart of self-adaptation height measuring device.
In figure: 1, uhf band antenna array, 2, four-in-one T/R assembly, 3, power division network, 4, multipath receiver, 5, multi-channel A/D sampling and digital down converter, 6, fiber rotation connector, 7, signal is processed extension set, 8, CFAR detection plate, 9, altitude signal disposable plates, 10, DSP digital signal processor, 11, FPGA programmable logic device, 12, high-speed chain crossing, 13, dsp bus, 14, FLASH flash memories, 15, control interface, 16, survey high Processing Algorithm assembly, 17, SD synchronous DRAM, 18, interface logic control circuit, 19, data pre-process circuit, 20, double port memory, 21, three-state buffer, 22, FIFO buffer.
Embodiment:
This self-adaptation height measuring device is by uhf band antenna array 1, four-in-one T/R assembly 2, power division network 3, multipath receiver 4, multi-channel A/D sampling and digital down converter 5, fiber rotation connector 6, signal is processed extension set 7, CFAR detection plate 8, altitude signal disposable plates 9, DSP digital signal processor 10, FPGA programmable logic device 11, high-speed link 12, dsp bus 13, FLASH flash memories 14, control connects 15, survey high Processing Algorithm assembly 16, SD synchronous DRAM 17, interface logic control circuit 18, data pre-process circuit 19, double port memory 20, three-state buffer 21, FIFO buffer 22 forms (referring to accompanying drawing 1～2).Uhf band antenna array 1 connects four-in-one T/R assembly 2 by feeder line, four-in-one T/R assembly 2 connects power division network 3 by feeder line, the row power splitter of power division network 3 is divided into seven tunnels and connects respectively multipath receiver 4, multipath receiver 4 is connected with multi-channel A/D sampling and digital down converter 5, fiber rotation connector 6 input ends connect multi-channel A/D sampling and digital down converter 5 through optical fiber, its output terminal connects signal through optical fiber and processes extension set 7, signal is processed extension set 7 and is connected with CFAR detection plate 8 by high-speed bus, CFAR detection plate 8 connects altitude signal disposable plates 9 (referring to accompanying drawing 1) by high-speed bus.
Described altitude signal disposable plates 9 is made up of four DSP digital signal processors 10 (that is: DSP0, DSP1, DSP2, DSP3), FPGA programmable logic device 11, high-speed chain crossing 12, dsp bus 13, FLASH flash memories 14; DSP digital signal processor 10 by control interface 15, survey high Processing Algorithm assembly 16, SD synchronous DRAM 17 forms; FPGA programmable logic device 11 is by interface logic control circuit 18, data pre-process circuit 19, double port memory 20, three-state buffer 21, and FIFO buffer 22 forms; FPGA programmable logic device 11 is connected with the DSP0 of DSP digital signal processor 10 by dsp bus 13, DSP0 is connected with DSP1, DSP2, the DSP3 of DSP digital signal processor 10 respectively by high-speed chain crossing 12, and DSP0 is connected (referring to accompanying drawing 2) by dsp bus 13 with the FIFO buffer 22 of FPGA programmable logic device 11.
Described three-state buffer 21 is than the many Strobe inputs of conventional impact damper, and this input end represents with E, gating in the time of E=1, and output terminal is directly delivered in its input; In the time of E=0, impact damper is prevented from, and it exports always high-impedance state, and disconnection is connected with bus.FLASH flash memories 14, belongs to EEPROM electrically erasable programmable ROM.High-speed bus is a kind of high velocity, low pressure difference string line.
The principle of work of this self-adaptation height measuring device is as follows:
The echoed signal that target reflects is received by 21 row × 16 row uhf band antenna arrays 1, then through the limiter in 84 four-in-one T/R assemblies 2, low noise amplifier and the processing of reception width phase control circuit, carry out amplitude weighting by the row power splitter of power division network 3 and synthesize Er Shi mono-road row signal, again adjacent three row are synthesized, form seven way battle array rf echo signals, seven way battle array signals enter multipath receiver 4 and after mixing amplification filtering, export 7 road 30MHz echo signal of intermediate frequency, 7 road 30MHz echo signal of intermediate frequency are converted to digital I through multi-channel A/D sampling and Digital Down Convert 5, Q signal, after opto-electronic conversion, process extension set 7 by fiber rotation connector 6 and Optical Fiber Transmission to signal again, process in extension set 7 light signal is reduced into electric signal at signal, successively multiple signals are carried out to amplitude and phase correction again, sidelobe cancellation, pulse compression, after digital beam formation processing, send into CFAR detection plate 8 and extract target echo signal, target echo signal enters altitude signal disposable plates 9 and surveys high processing, finally, by the FPGA programmable logic device 11 in altitude signal disposable plates 9, height result is delivered to external interface circuit and carry out other subsequent treatment.
The principle of work of altitude signal disposable plates 9 is as follows:
Altitude signal disposable plates 9 hardware body frameworks are made up of four DSP digital signal processor 10:DSP0, DSP1, DSP2, DSP3 and a FPGA programmable logic device 11.FPGA programmable logic device 11 produces work schedule and the control command of altitude signal disposable plates 9 inside according to the control of outside input, triggering, clock signal, receive the 7 road target echo signals that extracted by CFAR detection plate 8 simultaneously, target data is carried out to following pre-service: calculate the number of targets of current radar period, extract target range unit the echo data packing to each range unit, the data of handling well are stored in inner double port memory 20 (RAM), FPGA programmable logic device 11 can send interrupting information to the DSP0 of DSP digital signal processor 10 simultaneously, notice DSP0 carries out the reception of echo data and control command, DSP0 is 4 by data length by target data reasonable distribution after receiving data, will be wherein 3 give respectively DSP1 by high-speed chain crossing 12, DSP2, DSP3, 4 DSP digital signal processors 10 carry out height simultaneously to be processed, DSP1, DSP2, DSP3 by process the loopback of height result to DSP0, DSP0 will write buffer memory in the FIFO buffer 22 in FPGA programmable logic device 11 by dsp bus 13 after height sort result, FPGA programmable logic device 11 is delivered to terminal according to system works sequential by height result and is shown.
Survey high treatment scheme as follows:
While surveying high processing, signal is processed extension set 7 front ends seven passages is carried out respectively to the processing such as pulse pressure, and complete the detection of target, and point to and the information such as system works pattern to 7 tunnel echoed signals, the antenna beam elevation angle that altitude signal disposable plates 9 provides target, survey high processing; Carry out according to beam position information with to target that DBF digital beam is synthetic to be surveyed the high elevation angle and estimate the roughly interval, the elevation angle of target obtaining, then undertaken by following disposal route:
(1) if in low latitude, adopting lobe disintegrating method and maximum likelihood method to combine, target processes;
(2) if target in hollow, preferentially adopts maximum likelihood method to process;
(3) if target in high-altitude, preferentially adopts DBF method to process; ;
(4) when lobe disintegrating method and DBF method result of calculation are when invalid, adopt the height result of maximum likelihood method.
(5), for different landform, different super-resolution processing methods will be adopted.To good position, can calculate the elevation angle of multipath signal according to the elevation angle of direct wave, thereby structure projection matrix only need carry out linear search, therefore adopt maximum likelihood (ML) algorithm; And to complicated position, the elevation angle of multipath signal can not directly be calculated, need to do at the elevation angle of the elevation angle of direct wave and multipath signal bidimensional search, adopt alternating projection maximum likelihood (ML-AP) algorithm to calculate.
Claims (1)
1. a self-adaptation height measuring device, by uhf band antenna array (1), four-in-one T/R assembly (2), power division network (3), multipath receiver (4), multi-channel A/D sampling and digital down converter (5), fiber rotation connector (6), signal is processed extension set (7), CFAR detection plate (8), altitude signal disposable plates (9) forms, it is characterized in that: uhf band antenna array (1) connects four-in-one T/R assembly (2) by feeder line, four-in-one T/R assembly (2) connects power division network (3) by feeder line, the row power splitter of power division network (3) is divided into seven tunnels and connects respectively multipath receiver (4), multipath receiver (4) is connected with multi-channel A/D sampling and digital down converter (5), fiber rotation connector (6) input end connects multi-channel A/D sampling and digital down converter (5) through optical fiber, its output terminal connects signal through optical fiber and processes extension set (7), signal is processed extension set (7) and is connected with CFAR detection plate (8) by high-speed bus, CFAR detection plate (8) connects altitude signal disposable plates (9) by high-speed bus, altitude signal disposable plates (9) is made up of four DSP digital signal processors (10) DSP0, DSP1, DSP2, DSP3, FPGA programmable logic device (11), high-speed chain crossing (12), dsp bus (13), FLASH flash memories (14), four DSP digital signal processors (10) by control interface (15), survey high Processing Algorithm assembly (16), SD synchronous DRAM (17) composition, FPGA programmable logic device (11) is made up of interface logic control circuit (18), data pre-process circuit (19), double port memory (20), three-state buffer (21), FIFO buffer (22), FPGA programmable logic device (11) is connected with the DSP0 of DSP digital signal processor (10) by dsp bus (13), DSP0 is connected with DSP1, DSP2, the DSP3 of DSP digital signal processor (10) respectively by high-speed chain crossing (12), and DSP0 is connected with the FIFO buffer (22) of FPGA programmable logic device (11) by dsp bus (13),
Altitude signal disposable plates (9) hardware body framework is by four DSP digital signal processors (10): DSP0, DSP1, DSP2, DSP3 and a FPGA programmable logic device (11) composition, FPGA programmable logic device (11) is according to the control of outside input, trigger, clock signal produces altitude signal disposable plates (9) inner work schedule and control command, receive by CFAR detection plate (8) simultaneously and extract Qi road target echo signal, target data is carried out to following pre-service: the number of targets of calculating current radar period, extract target range unit the echo data packing to each range unit, the data of handling well are stored in inner double port memory (20), FPGA programmable logic device (11) sends interrupting information to the DSP0 of DSP digital signal processor (10) simultaneously, notice DSP0 carries out the reception of echo data and control command, DSP0 is four by data length by target data reasonable distribution after receiving data, will be wherein three give respectively DSP1 by high-speed chain crossing (12), DSP2, DSP3, four DSP digital signal processors (10) carry out height simultaneously to be processed, DSP1, DSP2, DSP3 by process the loopback of height result to DSP0, DSP0 will write buffer memory in the FIFO buffer (22) in FPGA programmable logic device (11) by dsp bus (13) after height sort result, FPGA programmable logic device (11) is delivered to terminal according to system works sequential by height result and is shown,
Signal is processed extension set (7) front end seven passages is carried out respectively to pulse pressure processing, and complete the detection of target, provide target Qi road echoed signal, the antenna beam elevation angle to point to and system works pattern information to altitude signal disposable plates (9), survey high processing; Carry out according to beam position information with to target that DBF digital beam is synthetic to be surveyed the high elevation angle and estimate the roughly interval, the elevation angle of target obtaining, then undertaken by following disposal route:
If a target in low latitude, adopts lobe disintegrating method and maximum likelihood method to combine and processes;
If two targets in hollow, preferentially adopt maximum likelihood method to process;
If three targets in high-altitude, preferentially adopt DBF method to process;
Four, when lobe disintegrating method and DBF method result of calculation are when invalid, adopt the height result of maximum likelihood method;
Five, for different landform, by adopting different super-resolution processing methods, to good position, can calculate the elevation angle of multipath signal according to the elevation angle of direct wave, thereby structure projection matrix, only need carry out linear search, therefore adopt maximum likelihood (ML) algorithm; And to complicated position, the elevation angle of multipath signal can not directly be calculated, need to do at the elevation angle of the elevation angle of direct wave and multipath signal bidimensional search, adopt alternating projection maximum likelihood (ML-AP) algorithm to calculate.
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| CN103308909B (en) * | 2013-03-06 | 2014-12-17 | 西安电子科技大学 | Multi-parameter alternating search-based metrewave radar low elevation height measurement method |
| CN104375124A (en) * | 2014-11-18 | 2015-02-25 | 无锡悟莘科技有限公司 | Rader system with nested antenna as main antenna |
| CN106997040B (en) * | 2016-12-19 | 2020-01-07 | 四川九洲电器集团有限责任公司 | L-band radar signal receiving equipment and method |
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| CN101135727A (en) * | 2006-08-29 | 2008-03-05 | 中国科学院空间科学与应用研究中心 | Radar altimeter used for detecting and landing in rail |
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| CN101135727A (en) * | 2006-08-29 | 2008-03-05 | 中国科学院空间科学与应用研究中心 | Radar altimeter used for detecting and landing in rail |
Non-Patent Citations (1)
| Title |
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| 姜建锋.米波圆接收阵雷达数字波束形成技术.《中国优秀硕士学位论文全文数据库 信息科技辑》.2010,第16-17页. * |
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