CN102841336A - High-frequency ground wave radar multi-frequency signal coherent receiver - Google Patents
High-frequency ground wave radar multi-frequency signal coherent receiver Download PDFInfo
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- CN102841336A CN102841336A CN201210322779XA CN201210322779A CN102841336A CN 102841336 A CN102841336 A CN 102841336A CN 201210322779X A CN201210322779X A CN 201210322779XA CN 201210322779 A CN201210322779 A CN 201210322779A CN 102841336 A CN102841336 A CN 102841336A
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Abstract
The invention discloses a high-frequency ground wave radar multi-frequency signal coherent receiver and belongs to the technical field of radar signal coherent receivers. The high-frequency ground wave radar multi-frequency signal coherent receiver comprises a high-speed electronic switching circuit, a band-pass filter, an analog-to-digital converter and a digital signal processor, all of which are connected in sequence. A radar signal is converted into a digital signal by the analog-to-digital converter and then is used as the input variable of the digital signal processor; and the digital signal processor is used for subjecting the digital signal to filtering, frequency band dividing and frequency mixing with a local oscillation signal of each frequency band. According to the invention, the receiving of a multi-frequency-band high-frequency ground wave radar signal is realized, and meanwhile, a Doppler velocity blind zone can be eliminated. The receiver provided by the invention is realized by using a high-integration analog-to-digital converting chip, so that the circuit is simplified, the signal-to-noise ratio and the channel isolation degree are increased, and the system stability is optimized.
Description
Technical field
The invention discloses high-frequency ground wave radar multiple-frequency signal coherent receiver, belong to the technical field of radar signal coherent receiver.
Background technology
Mostly existing high-frequency ground wave radar is one-segment mode of operation and bank base formula ground wave radar, the same clock source processing signals of employing, and its signal receiver is also just designed by satisfying the one-segment mode of operation.In view of the effect of surveying, wind, unrestrained inversion error are bigger, and detection range is limited, the also difficult realization of the research of target algorithm, and wherein the part chief reason is because existing high-frequency ground wave radar all works in the one-segment pattern and is mostly bank base formula.The one-segment high-frequency ground wave radar makes the antenna array utilization factor not high, and it is limited that data are obtained rate.Be necessary to provide a kind of coherent receiver that receives multiband high-frequency ground wave radar signal.
Summary of the invention
Technical matters to be solved by this invention is to the deficiency of above-mentioned background technology, and high-frequency ground wave radar multiple-frequency signal coherent receiver is provided.
The present invention adopts following technical scheme for realizing the foregoing invention purpose:
High-frequency ground wave radar multiple-frequency signal coherent receiver; Comprise: the high speed electronic switch circuit, analog filter, analog to digital converter, the digital signal processor that are linked in sequence; The input end of said high speed electronic switch circuit is connected with array antenna, said digital signal processor output high-frequency ground wave radar multiple-frequency signal.
In the said high-frequency ground wave radar multiple-frequency signal coherent receiver, digit signal receiver comprises: digital band-pass filter, register, a n frequency mixer, a n low-pass filter, and n is the positive integer more than or equal to 2;
Wherein: the digital signal of the input termination analog to digital converter output of said digital band-pass filter; Output terminal is connected with the input end of frequency band signals divider; The input end of n the frequency mixer of output termination of said frequency band signals divider, low-pass filter of the output termination of each frequency mixer.
In the said high-frequency ground wave radar multiple-frequency signal coherent receiver, the high speed electronic switch circuit is SL54122 electric leakage high speed electronic switch circuit or transistor high speed electronic switch circuit or the high speed electronic switch circuit that has the pincers diode.
In the said high-frequency ground wave radar multiple-frequency signal coherent receiver, analog to digital converter is selected the AD9277 chip for use.
In the said high-frequency ground wave radar multiple-frequency signal coherent receiver, digital signal processor is selected the XC6VLX240T chip for use.
The present invention adopts technique scheme, has following beneficial effect: the present invention has realized the reception of multiband high-frequency ground wave radar signal, can eliminate the doppler velocity blind area simultaneously.Utilize the modulus conversion chip of high integration to realize the present invention, simplified circuit.
Description of drawings
Fig. 1 is the block diagram of high-frequency ground wave radar multiple-frequency signal coherent receiver.
Fig. 2 is the block diagram of digital signal processor.
Fig. 3 is the fundamental diagram of digital signal processor.
Fig. 4 is the extraction synoptic diagram of digital signal processing to baseband signal.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to invention:
As shown in Figure 1; High-frequency ground wave radar multiple-frequency signal coherent receiver comprises: the high speed electronic switch circuit that is linked in sequence, 7 rank analog filters, analog to digital converter, digital signal processor; The input end of high speed electronic switch circuit is connected with array antenna, digital signal processor output high-frequency ground wave radar multiple-frequency signal.The array antenna received echoed signal is to receiver rf front-end, and high-frequency ground wave radar is the radar of FMICW system, and the high speed electronic switch circuit is closed receiving cable during the radar transmitter emission, does not open passage during the emission and receives echoed signal; 7 rank analog filter passbands are 3-30MHz, and the multiple-frequency operation frequency configuration of radar is in 3-30MHz, and 7 rank analog filters suppress the interference that out-of-band-signal brings to receiving system.
Digit signal receiver is as shown in Figure 2 to be comprised: digital band-pass filter, register, 3 frequency mixer, 3 low-pass filters; The digital signal of the input termination analog to digital converter output of digital band-pass filter; Output terminal is connected with the input end of frequency band signals divider; The input end of 3 frequency mixer of output termination of frequency band signals divider, low-pass filter of the output termination of each frequency mixer.
The high speed electronic switch circuit is SL54122 electric leakage high speed electronic switch circuit or transistor high speed electronic switch circuit or the high speed electronic switch circuit that has the pincers diode.
Analog to digital converter has been selected the AD9277 chip for use; This chip is 8 passage 14bit serial high-speed a/ds; Its inner integrated pre-low-noise amplifier (LNA), controllable gain amplifier (VGA), frequency overlapped-resistable filter (AAF) and ADC; The change in gain of pre-low-noise amplifier and controllable gain amplifier adjustment signalling channel improves system sensitivity and Adjustment System linear dynamic range.The AD9277 integrated level is high, and the mimic channel of the front end of minimizing greatly reduces channel isolation.The differential signal input that analog input is partly adopted reduces and disturbs.The numeral output is serial LVDS transmission, and speed can arrive 600M/s, has simplified circuit design, has increased system stability.
Digital signal processor has been selected the XC6VLX240T chip of Xilinx Virtex-6 series for use.Through emulation, resources such as the DSP48e of this chip, EMAC all satisfy the needs of system design.This chip is mainly accomplished the signal Processing of system and synthesizing of 3 band frequencies, system signal when all clocks are participated in mutually.The modulating bandwidth of this 3 band frequency does not occur simultaneously, and could realize the extraction of 3 band frequency baseband signals.This 3 band frequency signal is respectively the coherent signal of local oscillation signal f1, f2, f3, is the echoed signal of radar emission signal.
The principle of work of digital signal processor is as shown in Figure 3: the signal of each passage carries out through ADC after the digital quantization, gets into FPGA and carries out digital signal processing.What at first accomplish is digital filtering; This wave filter is a digital band-pass filter; Fdatool through Matlab generates, and the beginning of wave filter and cutoff frequency can be according to the designs that is provided with of 3 concrete band frequencies, and 3 band frequencies must be within the passband of this wave filter; The inhibition degree can be set to more than the 60dB, and inband flatness can be set to below the 0.2dB; The raising of this each big degree of wave filter spectral purity, suppress spurious signal.Cushion through register and the distribution of 3 segment signals through the signal of digital filtering, this 3 segment signal is still same signal but comprised the frequency content of 3 band frequencies at this moment.Clock signal is a benchmark with time system signal, thereby realizes full coherent system.
As shown in Figure 4; The first band frequency signal and local oscillation signal f1 are carried out mixing and IQ decomposition; Obtain the baseband signal of f1 band frequency, second and third band frequency signal and local oscillation signal f1 mixing have also produced other frequency contents, but these frequencies are all outside modulating bandwidth; Through cutoff frequency less than the low-pass filter of modulating bandwidth with these frequency content filterings, promptly realized the extraction of first band frequency.Same method realizes the extraction of second and third band frequency.
In sum, the present invention has realized the reception of multiband high-frequency ground wave radar signal; In view of the transmission frequency difference can cause the Bragg frequency different, near the echo signal the Bragg frequency is detected to eliminate the doppler velocity blind area.Utilize the modulus conversion chip of high integration to realize the present invention, simplified circuit, improved signal to noise ratio (S/N ratio) and channel isolation, optimization system stability.The foregoing description is merely a specific embodiment of the present invention, and all meet the embodiment of this patent invention aim all within the protection domain of invention.
Claims (5)
1. high-frequency ground wave radar multiple-frequency signal coherent receiver; It is characterized in that comprising: the high speed electronic switch circuit, analog filter, analog to digital converter, the digital signal processor that are linked in sequence; The input end of said high speed electronic switch circuit is connected with array antenna, said digital signal processor output high-frequency ground wave radar multiple-frequency signal.
2. high-frequency ground wave radar multiple-frequency signal coherent receiver according to claim 1 is characterized in that said digit signal receiver comprises: digital band-pass filter, register, a n frequency mixer, a n low-pass filter, and n is the positive integer more than or equal to 2;
Wherein: the digital signal of the input termination analog to digital converter output of said digital band-pass filter; Output terminal is connected with the input end of frequency band signals divider; The input end of n the frequency mixer of output termination of said frequency band signals divider, low-pass filter of the output termination of each frequency mixer.
3. high-frequency ground wave radar multiple-frequency signal coherent receiver according to claim 1 is characterized in that said high speed electronic switch circuit is SL54122 electric leakage high speed electronic switch circuit or transistor high speed electronic switch circuit or the high speed electronic switch circuit that has the pincers diode.
4. high-frequency ground wave radar multiple-frequency signal coherent receiver according to claim 1 is characterized in that said analog to digital converter selects the AD9277 chip for use.
5. high-frequency ground wave radar multiple-frequency signal coherent receiver according to claim 1 is characterized in that said digital signal processor selects the XC6VLX240T chip for use.
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| CN201210322779XA CN102841336A (en) | 2012-09-04 | 2012-09-04 | High-frequency ground wave radar multi-frequency signal coherent receiver |
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| CN201210322779XA CN102841336A (en) | 2012-09-04 | 2012-09-04 | High-frequency ground wave radar multi-frequency signal coherent receiver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445548A (en) * | 2015-11-11 | 2016-03-30 | 中国电子科技集团公司第二十九研究所 | Test system and test method for testing phase coherent properties of radio frequency signals |
| CN113030871A (en) * | 2021-03-18 | 2021-06-25 | 中国电子科技集团公司第三十八研究所 | High-low frequency echo alternate processing method suitable for Mars subsurface detection radar |
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| US4958361A (en) * | 1988-04-22 | 1990-09-18 | Hughes Aircraft Company | Edge effect reduction by smoothing in digital receivers |
| CN2762154Y (en) * | 2004-12-13 | 2006-03-01 | 武汉大学 | High frequency ground rada digital coherent receiver |
| CN2804884Y (en) * | 2005-06-28 | 2006-08-09 | 武汉大学 | Analog front end of multi-channel, high-frequency ground wave radar receiver |
| WO2009013314A1 (en) * | 2007-07-24 | 2009-01-29 | Thales | Method for intercepting radioelectric signals and instantaneous broadband compact receiver |
| CN202904007U (en) * | 2012-09-04 | 2013-04-24 | 中船重工鹏力（南京）大气海洋信息系统有限公司 | High-frequency ground-wave radar multi-frequency-range signal coherent receiver |
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2012
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Patent Citations (5)
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|---|---|---|---|---|
| US4958361A (en) * | 1988-04-22 | 1990-09-18 | Hughes Aircraft Company | Edge effect reduction by smoothing in digital receivers |
| CN2762154Y (en) * | 2004-12-13 | 2006-03-01 | 武汉大学 | High frequency ground rada digital coherent receiver |
| CN2804884Y (en) * | 2005-06-28 | 2006-08-09 | 武汉大学 | Analog front end of multi-channel, high-frequency ground wave radar receiver |
| WO2009013314A1 (en) * | 2007-07-24 | 2009-01-29 | Thales | Method for intercepting radioelectric signals and instantaneous broadband compact receiver |
| CN202904007U (en) * | 2012-09-04 | 2013-04-24 | 中船重工鹏力（南京）大气海洋信息系统有限公司 | High-frequency ground-wave radar multi-frequency-range signal coherent receiver |
Non-Patent Citations (1)
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| 丁鹭飞等: "《雷达原理》", 31 March 2012 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445548A (en) * | 2015-11-11 | 2016-03-30 | 中国电子科技集团公司第二十九研究所 | Test system and test method for testing phase coherent properties of radio frequency signals |
| CN113030871A (en) * | 2021-03-18 | 2021-06-25 | 中国电子科技集团公司第三十八研究所 | High-low frequency echo alternate processing method suitable for Mars subsurface detection radar |
| CN113030871B (en) * | 2021-03-18 | 2023-05-16 | 中国电子科技集团公司第三十八研究所 | High-low frequency echo alternating processing method suitable for Mars subsurface detection radar |
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Application publication date: 20121226 |