CN102253380A - Adaptive height measurement device - Google Patents
Adaptive height measurement device Download PDFInfo
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- CN102253380A CN102253380A CN2011100759507A CN201110075950A CN102253380A CN 102253380 A CN102253380 A CN 102253380A CN 2011100759507 A CN2011100759507 A CN 2011100759507A CN 201110075950 A CN201110075950 A CN 201110075950A CN 102253380 A CN102253380 A CN 102253380A
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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 the radar detection apparatus technical field.
Background technology:
Metre wave radar has its special advantages because its wavelength is longer at aspects such as anti-stealthy, anti-antiradiation missiles, is subjected to the generally attention of countries in the world in recent years, one after another the development metre wave radar is put into the critical positions of radar-probing system.But how the wave beam broad of metre wave radar because multipath effect influence causes the object height measuring accuracy lower, improves the metre wave radar altimetry precision and is one of difficult problem that radar circle will solve after the ground return.The high method of main survey that present metre wave radar is taked has: lobe disintegrating method, maximum likelihood method and digital beam synthesize (DBF) method.
Survey in the high method at above-mentioned three kinds, lobe disintegrating method and maximum likelihood method are surveyed height can solve the high problem of low elevation angle district survey effectively, but the lobe disintegrating method since in the high elevation angle have the problem of " subregion fuzzy ", survey high method based on the metre wave radar of lobe division and can only in low elevation coverage, survey high.Though it is wider that maximum likelihood method is suitable for angular range, precision is lower in the zone, the low elevation angle of antenna lobe division, and operand is bigger.Digital beam synthetic (DBF) is surveyed height and mainly is used in the high processing of high-altitude survey, though operand is little, the low-to-medium altitude multipath effect can cause its measuring accuracy and seriously influence.
This shows, develop a kind of equipment that can fully utilize the high method of various surveys, be used to improve the altimetry precision of metre wave radar in whole spatial domain, is that present metre wave radar is surveyed the problem that high field need solve.
Summary of the invention:
The objective of the invention is to, a kind of employing altitude signal disposable plates 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 surveys exists, working stability is reliable, altimetry precision height, 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 the uhf band antenna array, four unification T/R assemblies, power division network, multipath receiver, multi-channel A/D sampling and digital down converter, fiber rotation connector, the signal Processing extension set, the CFAR detection plate, the altitude signal disposable plates, the DSP digital signal processor, the FPGA programmable logic device, the high-speed link mouth, dsp bus, the FLASH flash memories, control interface, survey high Processing Algorithm assembly, the SD synchronous DRAM, the interface logic control circuit, the data pre-process circuit, double port memory, three-state buffer, the FIFO buffer constitutes, it is characterized in that: the uhf band antenna array connects four unification T/R assemblies by feeder line, four unification T/R assemblies connect power division network by feeder line, the capable power splitter of power division network is divided into seven the tunnel and connects multipath receiver respectively, multipath receiver is connected with digital down converter with multi-channel A/D sampling, the fiber rotation connector input end connects multi-channel A/D sampling and digital down converter through optical fiber, its output terminal connects the signal Processing extension set through optical fiber, the signal Processing extension set is connected with the CFAR detection plate by high-speed bus, and the CFAR detection plate connects the 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 link mouth, dsp bus, FLASH flash memories; Four DSP digital signal processors are formed by control interface, the high Processing Algorithm assembly of survey, SD synchronous DRAM; The FPGA programmable logic device is by interface logic control circuit, data pre-process circuit, double port memory, three-state buffer; The FIFO buffer is formed; The FPGA programmable logic device is connected by the DSP0 of dsp bus with the DSP digital signal processor, DSP0 is connected with DSP1, DSP2, the DSP3 of DSP digital signal processor respectively by the high-speed link mouth, and DSP0 is connected with the FIFO buffer of FPGA programmable logic device by dsp bus.
The present invention's beneficial effect compared with prior art is:
This self-adaptation height measuring device adopts the altitude signal disposable plates that is made of FPGA programmable logic device and DSP digital signal processor, realizes low target, adopts lobe disintegrating method and maximum likelihood method to unite and handles; To medium altitude target, preferentially adopt maximum likelihood method to handle; To high-altitude target, preferentially adopt DBF digital beam altimetry to handle.When lobe disintegrating method and DBF digital beam altimetry result of calculation are invalid, can adopt the high result of survey of maximum likelihood method.Through actual service test, significantly reduced operand, reduced of the influence of low-to-medium altitude multipath effect to altimetry precision, effectively improved the altimetry precision of metre wave radar.Not only guaranteed the altimetry precision of metre wave radar in spatial domain, the basic, normal, high elevation angle, also enlarged 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.
Description of 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.
Among the figure: 1, the uhf band antenna array, 2, four unification T/R assemblies, 3, power division network, 4, multipath receiver, 5, multi-channel A/D sampling and digital down converter, 6, fiber rotation connector, 7, the signal Processing extension set, 8, the CFAR detection plate, 9, the altitude signal disposable plates, 10, the DSP digital signal processor, 11, the FPGA programmable logic device, 12, the high-speed link mouth, 13, dsp bus, 14, the FLASH flash memories, 15, control interface, 16, survey high Processing Algorithm assembly, 17, the SD synchronous DRAM, 18, the interface logic control circuit, 19, the data pre-process circuit, 20, double port memory, 21, three-state buffer, 22, the FIFO buffer.
Embodiment:
This self-adaptation height measuring device is by uhf band antenna array 1, four unification T/R assemblies 2, power division network 3, multipath receiver 4, multi-channel A/D sampling and digital down converter 5, fiber rotation connector 6, signal Processing 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 constitutes (referring to accompanying drawing 1～2).Uhf band antenna array 1 connects four unification T/R assemblies 2 by feeder line, four unification T/R assemblies 2 connect power division network 3 by feeder line, the capable power splitter of power division network 3 is divided into seven the tunnel and connects multipath receiver 4 respectively, multipath receiver 4 is connected with digital down converter 5 with multi-channel A/D sampling, 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 Processing extension set 7 through optical fiber, signal Processing extension set 7 is connected with CFAR detection plate 8 by high-speed bus, and CFAR detection plate 8 connects altitude signal disposable plates 9 (referring to accompanying drawings 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 link mouth 12, dsp bus 13, FLASH flash memories 14; DSP digital signal processor 10 is made up of control interface 15, the high Processing Algorithm assembly 16 of survey, SD synchronous DRAM 17; 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 is formed; 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 link mouth 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 Duoed a gating input end than conventional impact damper, and this input end is represented with E, gating when E=1, and output terminal is directly delivered in its input; When E=0, impact damper is prevented from, and it exports high-impedance state always, and disconnection is connected with bus.FLASH flash memories 14 belongs to the 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 reflection is returned is received by 21 row * 16 row uhf band antenna arrays 1, handles through limiter, low noise amplifier and reception width of cloth phase control circuit in 84 the four unification T/R assemblies 2 again; Carry out amplitude weighting by the capable power splitter of power division network 3 and synthesize 20 one road row signals, again adjacent triplex row is synthesized, form seven way battle array rf echo signals, seven way battle array signals are exported 7 road 30MHz echo signal of intermediate frequency after entering multipath receiver 4 process mixing amplification filtering, 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, again through passing through fiber rotation connector 6 and Optical Fiber Transmission after the opto-electronic conversion to signal Processing extension set 7, in signal Processing extension set 7, light signal is reduced into electric signal, successively multiple signals are carried out amplitude and phase correction again, sidelobe cancellation, pulse compression, after digital beam forms and handles, send into CFAR detection plate 8 and extract target echo signal, target echo signal enters altitude signal disposable plates 9 and surveys high the processing, at last, by the FPGA programmable logic device in the altitude signal disposable plates 9 11 the 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 the work schedule and the control command of altitude signal disposable plates 9 inside according to control, triggering, the clock signal of outside input, receive 7 road target echo signals that extract by CFAR detection plate 8 simultaneously, target data is carried out following pre-service: calculate the number of targets of current radar period, extract the target range unit and to the echo data packing of each range unit; With the data storage handled well 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, it is 4 with the target data reasonable distribution that DSP0 receives after the data by data length, will be wherein 3 give DSP1 respectively by high-speed link mouth 12, DSP2, DSP3,4 DSP digital signal processors 10 carry out height simultaneously to be handled, DSP1, DSP2, DSP0 is given in the height that DSP3 will handle loopback as a result, DSP0 writes buffer memory in the FIFO buffer 22 in the FPGA programmable logic device 11 by dsp bus 13 after will the height sort result, and FPGA programmable logic device 11 will the height result be delivered to terminal according to the system works sequential and shown.
It is as follows to survey high treatment scheme:
When surveying high the processing, signal Processing extension set 7 front ends carry out processing such as pulse pressure respectively to seven passages, and finish the detection of target, 7 tunnel echoed signals, the antenna beam elevation angle of target being provided for altitude signal disposable plates 9 pointed to and information such as system works pattern, surveys high the processing; Carry out the synthetic roughly interval, the elevation angle of target that the estimation of the high elevation angle obtains of surveying of DBF digital beam according to beam position information with to target, undertaken by following disposal route again:
(1) if in the low latitude, adopting lobe disintegrating method and maximum likelihood method to unite, target handles;
(2) if target in hollow, preferentially adopts maximum likelihood method to handle;
(3) if target in the high-altitude, preferentially adopts the DBF method to handle;
(4) when lobe disintegrating method and DBF method result of calculation are invalid, adopt the height result of maximum likelihood method.
(5), different super-resolution processing methods will be adopted at different landform.To good position, the elevation angle that can calculate multipath signal according to the elevation angle of direct wave, thus the structure projection matrix only need carry out linear search, so employing maximum likelihood (ML) algorithm; And to complicated position, the elevation angle of multipath signal can not directly be calculated, and need do the bidimensional search at the elevation angle of direct wave and the elevation angle of multipath signal, adopts alternating projection maximum likelihood (ML-AP) algorithm computation.
Claims (2)
1. self-adaptation height measuring device is by uhf band antenna array (1), four unification T/R assemblies (2), power division network (3), multipath receiver (4), multi-channel A/D sampling and digital down converter (5), fiber rotation connector (6), signal Processing 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 mouth (12), dsp bus (13), FLASH flash memories (14), control interface (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) constitutes, it is characterized in that: uhf band antenna array (1) connects four unification T/R assemblies (2) by feeder line, four unification T/R assemblies (2) connect power division network (3) by feeder line, the capable power splitter of power division network (3) is divided into seven the tunnel and connects multipath receiver (4) respectively, multipath receiver (4) is connected with digital down converter (5) with multi-channel A/D sampling, 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 Processing extension set (7) through optical fiber, signal Processing extension set (7) is connected with CFAR detection plate (8) by high-speed bus, and CFAR detection plate (8) connects altitude signal disposable plates (9) by high-speed bus.
2. a kind of self-adaptation height measuring device according to claim 1 is characterized in that: 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 link mouth (12), dsp bus (13), FLASH flash memories (14); Four DSP digital signal processors (10) are formed by control interface (15), survey high Processing Algorithm assembly (16), SD synchronous DRAM (17); 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 link mouth (12), and DSP0 is connected with the FIFO buffer (22) of FPGA programmable logic device (11) by dsp bus (13).
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| CN201110075950.7A CN102253380B (en) | 2011-03-24 | 2011-03-24 | Adaptive height measurement device |
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| CN201110075950.7A CN102253380B (en) | 2011-03-24 | 2011-03-24 | Adaptive height measurement device |
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| CN102253380B CN102253380B (en) | 2014-07-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308909A (en) * | 2013-03-06 | 2013-09-18 | 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 |
| CN106997040A (en) * | 2016-12-19 | 2017-08-01 | 四川九洲电器集团有限责任公司 | A kind of L-band radar signal receiving device 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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- 2011-03-24 CN CN201110075950.7A patent/CN102253380B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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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)
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| 姜建锋: "《中国优秀硕士学位论文全文数据库 信息科技辑》", 15 February 2010 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308909A (en) * | 2013-03-06 | 2013-09-18 | 西安电子科技大学 | Multi-parameter alternating search-based metrewave radar low elevation height measurement method |
| 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 |
| CN106997040A (en) * | 2016-12-19 | 2017-08-01 | 四川九洲电器集团有限责任公司 | A kind of L-band radar signal receiving device and method |
| 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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| CN102253380B (en) | 2014-07-23 |
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Address after: 434000 Jingzhou, Jiangsu Province, Sha Jin Road, No. 51 Patentee after: AEROSPACE NANHU ELECTRONIC INFORMATION TECHNOLOGY Co.,Ltd. Address before: 434007 No. 51 Jinlong Road, Shashi District, Hubei, Jingzhou Patentee before: JINGZHOU NANHU MACHINERY GENERAL FACTORY |