CN106788425B - Broadband millimeter wave LFMCW signal generating device and signal receiving and transmitting system comprising same - Google Patents
Broadband millimeter wave LFMCW signal generating device and signal receiving and transmitting system comprising same Download PDFInfo
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- H—ELECTRICITY
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- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/24—Automatic control of frequency or phase; Synchronisation using a reference signal directly applied to the generator
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H—ELECTRICITY
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- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
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Abstract
The invention discloses a broadband millimeter wave LFMCW signal generating device and a signal receiving and transmitting system comprising the device, wherein the device comprises: the clock circuit generates a clock signal of 4GHz DDS and a first local oscillator signal of 84.6 GHz; the DDS works according to a 4GHz DDS clock signal to generate an LFMCW signal with the bandwidth of 500MHz of 0.9-1.4 GHz; the frequency doubling circuit is used for doubling the frequency of the LFMCW signal with the bandwidth of 500MHz at 0.9-1.4 GHz to obtain the LFMCW signal at 7.2-11.2 GHz; and the first frequency mixer is used for mixing the LFMCW signal of 7.2-11.2 GHz with the first local oscillation signal of 84.6GHz to obtain the LFMCW signal of 91.8-95.8 GHz as an output signal of the broadband millimeter wave LFMCW signal generating device. The broadband millimeter wave LFMCW signal generated by the invention has high frequency stability and good linearity.
Description
Technical Field
The invention relates to the technical field of signal processing. And more particularly, to a wideband millimeter wave LFMCW signal generating apparatus and a signal transceiving system including the same.
Background
The airport runway foreign matter detection system utilizes the broadband millimeter wave LFMCW signal to scan and image the airport runway, and the quality of the broadband millimeter wave LFMCW signal directly determines the detection capability of the system. The linearity of the broadband millimeter wave LFMCW signal is directly related to the ranging precision of the target, the stability of the broadband millimeter wave LFMCW signal is directly related to background data cancellation processing in the imaging algorithm of the detection system, and effective background cancellation can improve the dynamic range of the system and improve the detection capability of the small target.
At present, an existing broadband millimeter wave LFMCW signal generation device mainly outputs an LFMCW signal in a lower frequency range through a VCO (voltage controlled oscillator), and then outputs an LFMCW signal in a 3mm waveband through a frequency doubling mode. The VCO is a device with poor frequency stability and large frequency drift along with time, and when the VCO is used for generating a broadband LFMCW signal, the system usually adopts a phase-locked loop mode, but the mode limits the frequency scanning speed of the LFMCW signal, and the mode is difficult to be applied to an airport runway foreign object detection system. In the actual engineering implementation of the airport runway foreign object detection system, an open-loop method is generally adopted, in order to ensure the linearity of the LFMCW signal generated by the VCO, the VCO output signal needs to be frequency calibrated, the VCO output signal is usually divided, so that the frequency is reduced to a range convenient to process, generally about 100MHz, then the processor counts the VCO output signal to complete the frequency measurement of the VCO, and the linearity of the finally output LFMCW signal is controlled through the compensation of a D/a (analog-to-digital converter). The disadvantage of this method is that the VCO is in an open loop, the stability of the frequency is poor, the linearity of the output LFMCW signal is not high, and the VCO has the characteristic of drifting along with time, so the VCO needs to be recalibrated at certain intervals, therefore, the complexity of system calibration is increased, and the effect of background cancellation is not ideal.
Therefore, it is required to provide a DDS (direct digital synthesizer) -based wideband millimeter wave LFMCW signal generating device and a signal transceiver system including the device, which ensure that the wideband millimeter wave LFMCW signal has high frequency stability and the frequency does not change with time, environment and other factors, and further improve the detection capability of the airport runway foreign object detection system for small objects.
Disclosure of Invention
The invention aims to provide a broadband millimeter wave LFMCW signal generating device and a signal transceiving system comprising the same, aiming at solving the problems of poor frequency stability and low linearity of the traditional LFMCW signal generating device based on a VCO (voltage controlled oscillator) and the problem of low detection capability of a foreign matter detection system of an airport runway on a small target caused by the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a broadband millimeter wave LFMCW signal generating apparatus comprising:
the clock circuit generates a clock signal of 4GHz DDS and a first local oscillator signal of 84.6 GHz;
the DDS works according to a 4GHz DDS clock signal to generate an LFMCW signal with the bandwidth of 500MHz of 0.9-1.4 GHz;
the frequency doubling circuit is used for doubling the frequency of the LFMCW signal with the bandwidth of 500MHz at 0.9-1.4 GHz to obtain the LFMCW signal at 7.2-11.2 GHz;
and the first frequency mixer is used for mixing the LFMCW signal of 7.2-11.2 GHz with the first local oscillation signal of 84.6GHz to obtain the LFMCW signal of 91.8-95.8 GHz as an output signal of the broadband millimeter wave LFMCW signal generating device.
Preferably, the clock circuit further comprises:
a 100MHz crystal oscillator for generating a 100MHz reference signal;
the first power divider divides a 100MHz reference signal into a 100MHz first reference signal and a 100MHz second reference signal;
the 40-time frequency multiplier is used for multiplying the frequency of the first reference signal of 100MHz to obtain a clock signal of a 4GHz DDS;
the 141-time frequency multiplier is used for carrying out frequency multiplication on the 100MHz second reference signal to obtain a frequency conversion local oscillator signal of 14.1 GHz;
and the 6-time frequency multiplier is used for multiplying the frequency of the 14.1GHz frequency conversion local oscillation signal to obtain a first local oscillation signal of 84.6 GHz.
Preferably, the clock circuit further comprises:
the first filtering amplifier is used for amplifying and filtering a first reference signal of 100 MHz;
the second filter amplifier is used for amplifying and filtering a second reference signal of 100 MHz;
the third filter amplifier is used for amplifying and filtering the clock signal of the 4GHz DDS;
the fourth filter amplifier is used for amplifying and filtering the frequency conversion local oscillation signal of 14.1 GHz;
and the fifth filtering amplifier is used for amplifying and filtering the first local oscillation signal of 84.6GHz of 100 MHz.
Preferably, the frequency multiplier circuit further comprises:
the first 2-time frequency multiplier is used for carrying out frequency multiplication on the LFMCW signal with the bandwidth of 500MHz and the bandwidth of 0.9-1.4 GHz to obtain the LFMCW signal with the bandwidth of 1.8-2.8 GHz;
the second 2-time frequency multiplier is used for carrying out frequency multiplication on the LFMCW signal of 1.8-2.8 GHz to obtain the LFMCW signal of 3.6-5.6 GHz;
and the third 2-time frequency multiplier is used for carrying out frequency multiplication on the LFMCW signal of 3.6-5.6 GHz to obtain the LFMCW signal of 7.2-11.2 GHz.
Preferably, the frequency multiplier circuit further comprises:
the sixth filtering amplifier is used for amplifying and filtering the LFMCW signal with the bandwidth of 500MHz at 0.9-1.4 GHz;
the seventh filter amplifier is used for amplifying and filtering the LFMCW signal of 1.8-2.8 GHz;
the eighth filter amplifier is used for amplifying and filtering the LFMCW signal of 3.6-5.6 GHz;
and the ninth filter amplifier is used for amplifying and filtering the LFMCW signal of 7.2-11.2 GHz.
A signal transceiving system including the wideband millimeter wave LFMCW signal generating apparatus, comprising:
the second power divider divides the LFMCW signal of 91.8-95.8 GHz generated by the broadband millimeter wave LFMCW signal generating device into a first LFMCW signal of 91.8-95.8 GHz and a second LFMCW signal of 91.8-95.8 GHz as a local oscillation signal of the second frequency mixer;
the transmitting antenna is used for transmitting the first LFMCW signal of 91.8-95.8 GHz as a detection signal;
a receiving antenna for receiving a target echo signal;
and the second mixer is used for mixing the target echo signal with a 91.8-95.8 GHz second LFMCW signal to obtain a target baseband signal serving as an output signal of the signal receiving and transmitting system.
Preferably, the signal transceiving system further comprises:
the tenth filter amplifier is used for amplifying and filtering LFMCW signals of 91.8-95.8 GHz;
the eleventh filter amplifier is used for amplifying and filtering the second LFMCW signal of 91.8-95.8 GHz;
the low-pass filter is used for filtering a target echo signal;
and the tenth filtering amplifier is used for amplifying and filtering the target baseband signal, and the amplified and filtered target baseband signal is used as an output signal of the signal receiving and transmitting system.
The invention has the following beneficial effects:
the broadband millimeter wave LFMCW signal generated by the technical scheme of the invention, particularly the LFMCW signal of 91.8-95.8 GHz, has the advantages of high frequency stability and good linearity; therefore, the complexity of the airport runway foreign matter detection system is reduced, the dynamic range of the system is improved, and the detection capability of the system on small targets is ensured.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of a broadband millimeter wave LFMCW signal generating apparatus.
Fig. 2 shows a schematic diagram of a signal transceiving system.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
As shown in fig. 1, the wideband millimeter wave LFMCW signal generating apparatus disclosed in the present invention includes: the device comprises a clock circuit, a DDS, a frequency multiplication circuit and a first mixer;
the clock circuit generates a clock signal of 4GHz DDS and a first local oscillator signal of 84.6GHz as a local oscillator signal of the first frequency mixer;
the DDS works according to a 4GHz DDS clock signal to generate an LFMCW signal with the bandwidth of 500MHz of 0.9-1.4 GHz;
the frequency doubling circuit is used for doubling the frequency of the LFMCW signal with the bandwidth of 500MHz at 0.9-1.4 GHz to obtain the LFMCW signal at 7.2-11.2 GHz;
and the first frequency mixer is used for mixing the LFMCW signal of 7.2-11.2 GHz with the first local oscillation signal of 84.6GHz to obtain the LFMCW signal of 91.8-95.8 GHz as an output signal of the broadband millimeter wave LFMCW signal generating device.
In this scheme, the clock circuit further includes: the power divider comprises a 100MHz crystal oscillator, a first power divider, a 40-time frequency multiplier, a 141-time frequency multiplier and a 6-time frequency multiplier;
a 100MHz crystal oscillator for generating a 100MHz reference signal;
the first power divider divides a 100MHz reference signal into a 100MHz first reference signal and a 100MHz second reference signal;
the 40-time frequency multiplier is used for multiplying the frequency of the first reference signal of 100MHz to obtain a clock signal of a 4GHz DDS;
the 141-time frequency multiplier is used for carrying out frequency multiplication on the 100MHz second reference signal to obtain a frequency conversion local oscillator signal of 14.1 GHz;
and the 6-time frequency multiplier is used for multiplying the frequency of the 14.1GHz frequency conversion local oscillation signal to obtain a first local oscillation signal of 84.6 GHz.
In this scheme, the clock circuit further includes:
the first filtering amplifier is used for amplifying and filtering a first reference signal of 100 MHz;
the second filter amplifier is used for amplifying and filtering a second reference signal of 100 MHz;
the third filter amplifier is used for amplifying and filtering the clock signal of the 4GHz DDS;
the fourth filter amplifier is used for amplifying and filtering the frequency conversion local oscillation signal of 14.1 GHz;
and the fifth filtering amplifier is used for amplifying and filtering the first local oscillation signal of 84.6GHz of 100 MHz.
In this scheme, frequency multiplier circuit further includes:
the first 2-time frequency multiplier is used for carrying out frequency multiplication on the LFMCW signal with the bandwidth of 500MHz and the bandwidth of 0.9-1.4 GHz to obtain the LFMCW signal with the bandwidth of 1.8-2.8 GHz;
the second 2-time frequency multiplier is used for carrying out frequency multiplication on the LFMCW signal of 1.8-2.8 GHz to obtain the LFMCW signal of 3.6-5.6 GHz;
and the third 2-time frequency multiplier is used for carrying out frequency multiplication on the LFMCW signal of 3.6-5.6 GHz to obtain the LFMCW signal of 7.2-11.2 GHz.
In this scheme, frequency multiplier circuit still further includes:
the sixth filtering amplifier is used for amplifying and filtering the LFMCW signal with the bandwidth of 500MHz at 0.9-1.4 GHz;
the seventh filter amplifier is used for amplifying and filtering the LFMCW signal of 1.8-2.8 GHz;
the eighth filter amplifier is used for amplifying and filtering the LFMCW signal of 3.6-5.6 GHz;
and the ninth filter amplifier is used for amplifying and filtering the LFMCW signal of 7.2-11.2 GHz.
The broadband millimeter wave LFMCW signal generated by the broadband millimeter wave LFMCW signal generating device disclosed by the invention has high frequency stability and the frequency does not change along with factors such as time, environment and the like.
As shown in fig. 2, the present invention further discloses a signal transceiving system including the wideband millimeter wave LFMCW signal generating device, which is applied to an airport runway foreign object detection system, and the system includes: the device comprises a broadband millimeter wave LFMCW signal generating device, a second power divider, a transmitting antenna, a receiving antenna and a second mixer;
the second power divider divides the LFMCW signal of 91.8-95.8 GHz generated by the broadband millimeter wave LFMCW signal generating device into a first LFMCW signal of 91.8-95.8 GHz and a second LFMCW signal of 91.8-95.8 GHz as a local oscillation signal of the second frequency mixer;
the transmitting antenna is used for transmitting the first LFMCW signal of 91.8-95.8 GHz as a detection signal;
the receiving antenna is used for receiving a target echo signal, wherein the target echo signal is a signal obtained by reflecting a detection signal by a target;
and the second mixer is used for mixing the target echo signal with a 91.8-95.8 GHz second LFMCW signal to obtain a target baseband signal serving as an output signal of the signal receiving and transmitting system.
In this scheme, the signal transceiving system further includes:
the tenth filter amplifier is used for amplifying and filtering LFMCW signals of 91.8-95.8 GHz;
the eleventh filter amplifier is used for amplifying and filtering the second LFMCW signal of 91.8-95.8 GHz;
the low-pass filter is used for filtering a target echo signal;
and the tenth filtering amplifier is used for amplifying and filtering the target baseband signal, and the amplified and filtered target baseband signal is used as an output signal of the signal receiving and transmitting system.
The output signal of the signal receiving and transmitting system is digitized by an A/D sampler of the airport runway foreign matter detection system and then is analyzed and processed by the data processing unit.
The signal receiving and transmitting system which is applied to the airport runway foreign matter detection system and comprises the broadband millimeter wave LFMCW signal generating device reduces the complexity of the airport runway foreign matter detection system, improves the dynamic range of the system and ensures the detection capability of the system on small targets.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (5)
1. A broad band millimeter wave LFMCW signal generating device applied to an airport runway foreign object detection system is characterized by comprising:
the clock circuit generates a clock signal of 4GHz DDS and a first local oscillator signal of 84.6 GHz;
the DDS works according to a 4GHz DDS clock signal to generate an LFMCW signal with the bandwidth of 500MHz of 0.9-1.4 GHz;
the frequency doubling circuit is used for doubling the frequency of the LFMCW signal with the bandwidth of 500MHz at 0.9-1.4 GHz to obtain the LFMCW signal at 7.2-11.2 GHz;
the first frequency mixer is used for mixing the LFMCW signal of 7.2-11.2 GHz with the first local oscillator signal of 84.6GHz to obtain the LFMCW signal of 91.8-95.8 GHz as an output signal of the broadband millimeter wave LFMCW signal generating device;
the clock circuit further comprises:
a 100MHz crystal oscillator for generating a 100MHz reference signal;
the first power divider divides a 100MHz reference signal into a 100MHz first reference signal and a 100MHz second reference signal;
the 40-time frequency multiplier is used for multiplying the frequency of the first reference signal of 100MHz to obtain a clock signal of a 4GHz DDS;
the 141-time frequency multiplier is used for carrying out frequency multiplication on the 100MHz second reference signal to obtain a frequency conversion local oscillator signal of 14.1 GHz;
the 6-time frequency multiplier is used for carrying out frequency multiplication on the 14.1GHz variable-frequency local oscillation signal to obtain a first local oscillation signal of 84.6 GHz;
the frequency multiplier circuit further comprises:
the first 2-time frequency multiplier is used for carrying out frequency multiplication on the LFMCW signal with the bandwidth of 500MHz and the bandwidth of 0.9-1.4 GHz to obtain the LFMCW signal with the bandwidth of 1.8-2.8 GHz;
the second 2-time frequency multiplier is used for carrying out frequency multiplication on the LFMCW signal of 1.8-2.8 GHz to obtain the LFMCW signal of 3.6-5.6 GHz;
and the third 2-time frequency multiplier is used for carrying out frequency multiplication on the LFMCW signal of 3.6-5.6 GHz to obtain the LFMCW signal of 7.2-11.2 GHz.
2. The broadband millimeter wave LFMCW signal generating apparatus according to claim 1, wherein the clock circuit further comprises:
the first filtering amplifier is used for amplifying and filtering a first reference signal of 100 MHz;
the second filter amplifier is used for amplifying and filtering a second reference signal of 100 MHz;
the third filter amplifier is used for amplifying and filtering the clock signal of the 4GHz DDS;
the fourth filter amplifier is used for amplifying and filtering the frequency conversion local oscillation signal of 14.1 GHz;
and the fifth filtering amplifier is used for amplifying and filtering the first local oscillation signal of 84.6GHz of 100 MHz.
3. The broadband millimeter wave LFMCW signal generating apparatus according to claim 1, wherein the frequency doubling circuit further comprises:
the sixth filtering amplifier is used for amplifying and filtering the LFMCW signal with the bandwidth of 500MHz at 0.9-1.4 GHz;
the seventh filter amplifier is used for amplifying and filtering the LFMCW signal of 1.8-2.8 GHz;
the eighth filter amplifier is used for amplifying and filtering the LFMCW signal of 3.6-5.6 GHz;
and the ninth filter amplifier is used for amplifying and filtering the LFMCW signal of 7.2-11.2 GHz.
4. A signal transmission/reception system for an airport runway foreign matter detection system comprising the broadband millimeter wave LFMCW signal generation apparatus of claim 1, the signal transmission/reception system comprising:
the second power divider divides the LFMCW signal of 91.8-95.8 GHz generated by the broadband millimeter wave LFMCW signal generating device into a first LFMCW signal of 91.8-95.8 GHz and a second LFMCW signal of 91.8-95.8 GHz as a local oscillation signal of the second frequency mixer;
the transmitting antenna is used for transmitting the first LFMCW signal of 91.8-95.8 GHz as a detection signal;
a receiving antenna for receiving a target echo signal;
and the second mixer is used for mixing the target echo signal with a 91.8-95.8 GHz second LFMCW signal to obtain a target baseband signal serving as an output signal of the signal receiving and transmitting system.
5. The signal transceiving system of claim 4, further comprising:
the tenth filter amplifier is used for amplifying and filtering LFMCW signals of 91.8-95.8 GHz;
the eleventh filter amplifier is used for amplifying and filtering the second LFMCW signal of 91.8-95.8 GHz;
the low-pass filter is used for filtering a target echo signal;
and the tenth filtering amplifier is used for amplifying and filtering the target baseband signal, and the amplified and filtered target baseband signal is used as an output signal of the signal receiving and transmitting system.
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| CN106019276A (en) * | 2016-08-03 | 2016-10-12 | 华讯方舟科技有限公司 | Millimeter-wave imaging device |
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| CN102332914A (en) * | 2011-08-12 | 2012-01-25 | 西安天伟电子***工程有限公司 | C-waveband frequency comprehensive generator with low phase noise |
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