CN116338601A - Broadband step frequency radar echo signal simulation device and method - Google Patents
Broadband step frequency radar echo signal simulation device and method Download PDFInfo
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- CN116338601A CN116338601A CN202111593516.8A CN202111593516A CN116338601A CN 116338601 A CN116338601 A CN 116338601A CN 202111593516 A CN202111593516 A CN 202111593516A CN 116338601 A CN116338601 A CN 116338601A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The invention provides a broadband step-by-step frequency radar echo signal simulation device and method, comprising a microwave unit, a signal processing unit and a control unit, wherein the microwave unit comprises a receiving down-conversion assembly, a local oscillation module and a transmitting up-conversion assembly, the receiving down-conversion assembly comprises a first down-conversion assembly and a second down-conversion assembly, the transmitting up-conversion assembly comprises a first up-conversion assembly and a second up-conversion assembly, the local oscillation module comprises a first local oscillation module and a second local oscillation module, the microwave unit transmits received radio frequency to the signal processing unit after passing through the first local oscillation module, the first down-conversion assembly, the second local oscillation module and the second down-conversion assembly, and the signal processing unit generates echo signals and transmits the echo signals to the first transmitting up-conversion assembly, the second local oscillation module, the first local oscillation module and the second transmitting up-conversion assembly to convert the echo signals and transmit the echo signals. The invention completes the simulation of the broadband step-by-step frequency radar echo signal under the condition of narrower signal processing bandwidth, and realizes the phase relativity of the output signal by switching the point frequency source of the local oscillation module II.
Description
Technical Field
The invention belongs to the technical field of testing, and particularly relates to a broadband step-by-step frequency radar echo signal simulation device and method.
Background
The prior radar echo simulator has narrower intermediate frequency signal processing bandwidth, can not adapt to a new system radar with large signal bandwidth, such as a broadband step frequency system radar, and the like, and generally adopts a method for increasing the intermediate frequency signal processing bandwidth to adapt to the radio frequency storage of a broadband signal in order to adapt to the target echo signal simulation of the broadband step frequency radar under the new system, but under the condition, the increase of the intermediate frequency signal processing bandwidth and the improvement of intermediate frequency processing frequency can improve the intermediate frequency digital sampling rate, the digital storage capacity, the high-speed digital signal processing speed and the frequency selective setting of the radio frequency up-down conversion, thereby greatly increasing the hardware design complexity and the hardware cost of the whole system.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a broadband step-by-step frequency radar echo signal simulation device and method. The scheme of the invention can solve the problems in the prior art.
The technical solution of the invention is as follows:
according to a first aspect, a wideband step-by-step radar echo signal simulation device is provided, which comprises a microwave unit, a signal processing unit and a control unit, wherein the microwave unit comprises a receiving down-conversion component, a local oscillation module and a transmitting up-conversion component, the receiving down-conversion component comprises a down-conversion component I and a down-conversion component II, the transmitting up-conversion component comprises an up-conversion component I and an up-conversion component II, the local oscillation module comprises a local oscillation module I and a local oscillation module II, the microwave unit transmits received radio frequency to the signal processing unit after passing through the local oscillation module I, the down-conversion component I, the local oscillation module II and the down-conversion component II, the signal processing unit processes a frequency conversion signal to generate an echo signal, and transmits the echo signal to the transmitting up-conversion component I, the local oscillation module II, the local oscillation module I and the transmitting up-conversion component II to convert the echo signal and transmit the echo signal; the local oscillation module comprises at least two point frequency sources, wherein when the number of the received signals is N/2, a first point frequency source is used, and when the number of the received signals is N/2, a second point frequency source is used, wherein N is the number of the received step frequency radar subcode radio frequency signals; the control unit is linked with the microwave units and controls the signal transmission path between the microwave units and the point frequency source switching of the local oscillation module II.
Further, the signal bandwidth of the signal processing unit is larger than half of the synthesized bandwidth of the step radar signal.
Further, the frequency of the local oscillation module one is lo1=rf1+rf, where: RF is the center frequency of the received RF signal, and RF1 is the center frequency of the received RF signal after the first stage of down-conversion.
Further, the first point frequency source frequency in the local oscillation module II is: lo2_1=rf1+ (if+b/2), wherein IF is the center frequency of the second-stage down-conversion of the received radio frequency signal, and B is the signal bandwidth of the signal processing unit; the second point frequency source frequency in the local oscillation module II is as follows: lo2_2=rf1+ (IF-B/2).
Furthermore, the second local oscillation module further comprises a signal generator, and the signal generator mixes with the point frequency source to generate two frequencies provided by the second local oscillation module.
Preferably, when the 1 st to (N/2-1) th subcode signal arrives, the clock frequency f of the point frequency source module d _1＝RF1+(IF+B/2)+f DDS When the N/2-N subcode signals arrive, the clock frequency f of the point frequency source module d _2＝RF1+(IF-B/2)+f DDS Wherein f DDS Is the signal generator baseband signal frequency.
According to a second aspect, there is provided the above-mentioned wideband step-frequency radar echo signal simulation method, including the steps of:
receiving subcode radio frequency signals transmitted by the step frequency radar;
determining the synthesis bandwidth of the step frequency radar transmitting signal according to the number of subcodes of the received subcode radio frequency signal and the bandwidth of the subcode linear frequency modulation signal;
generating radar echo signals through paths when 1 st to (N/2-1) th subcode signals arrive, and generating radar echo signals through paths II when N/2 nd to N th subcode signals arrive;
the first path is as follows:
the method comprises the steps that a received radar subcode radio frequency signal is subjected to frequency down conversion through a first point frequency source of a local oscillation module I, a frequency down conversion module II and a frequency down conversion module II, an echo signal is transmitted after signal delay, and the echo signal is subjected to frequency up conversion through a first point frequency source of an upper conversion module I, a first point frequency source of a local oscillation module II, a frequency up conversion module II and a local oscillation module I to serve as a radar echo signal;
the second path is:
the received radar subcode radio frequency signal is subjected to frequency source and frequency down conversion by a local oscillation module I, a frequency down conversion assembly I, a second point frequency source of the local oscillation module II and the frequency down conversion assembly II to obtain a frequency down converted radio frequency signal, and after the time delay of the signal, and transmitting an echo signal, wherein the echo signal is used as a radar echo signal by obtaining an up-converted radio frequency signal through a second point frequency source of the up-conversion assembly I, the local oscillation module II, the up-conversion assembly II and the local oscillation module I.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the method that the first local oscillation module does not change the frequency and the second local oscillation module rapidly switches the point frequency source is adopted, so that the simulation of the broadband step-by-step frequency radar echo signal is completed under the condition that the signal processing bandwidth is narrow, and the phase relativity of the output signal is realized by switching the point frequency source of the second local oscillation module.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 shows a schematic structural diagram of a wideband step-by-step frequency radar echo signal simulation device according to an embodiment of the present invention;
fig. 2 shows a schematic diagram of steps of a wideband step-by-step frequency radar echo signal simulation method according to an embodiment of the present invention;
fig. 3 shows a timing diagram of signal reception and output in a local oscillation switching process of an echo signal arrival simulation device according to an embodiment of the present invention;
fig. 4 shows a process diagram of receiving down-conversion frequency conversion by the echo signal receiving analog device according to an embodiment of the present invention.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
As shown in fig. 1, according to an embodiment of the present invention, there is provided a wideband step-by-step radar echo signal simulation apparatus, including a microwave unit, a signal processing unit and a control unit, where the microwave unit includes a receiving down-conversion component, a local oscillation module and a transmitting up-conversion component, the receiving down-conversion component includes a down-conversion component first and a down-conversion component second, the transmitting up-conversion component includes a up-conversion component first and a up-conversion component second, the local oscillation module includes a local oscillation module first and a local oscillation module second, the microwave unit transmits a received radio frequency to the signal processing unit after passing through the local oscillation module first, the down-conversion component second and the local oscillation module second, the signal processing unit processes a converted signal to generate an echo signal, and transmits the echo signal to the up-conversion component first, the local oscillation module second, the local oscillation module first and the up-conversion component second, and the up-conversion component second convert the echo signal and transmit; the local oscillation module comprises at least two point frequency sources, wherein when the number of the received signals is N/2, a first point frequency source is used, and when the number of the received signals is N/2, a second point frequency source is used, wherein N is the number of the received step frequency radar subcode radio frequency signals; the control unit is linked with the microwave units and controls the signal transmission paths between the microwave units and the point frequency source switching of the local oscillation module II.
In a further embodiment, the frequency of the local oscillation module one is lo1=rf1+rf, where: RF1 is RF;
in a further embodiment, the first point source frequency in the second local oscillation module is: lo2_1=rf1+ (if+b/2), where IF is B is the signal processing unit signal bandwidth; the second point frequency source frequency in the local oscillation module II is as follows: lo2_2=rf1+ (IF-B/2).
Further, the methodIn one embodiment, the second local oscillation module further includes a signal generator, and the signal generator mixes with the point frequency source to generate two frequencies provided by the second local oscillation module. Preferably, in one embodiment, the clock frequency f of the dot frequency source module is equal to the clock frequency f of the 1 st to (N/2-1) th subcode signals d _1＝RF1+(IF+B/2)+f DDS When the N/2-N subcode signals arrive, the clock frequency f of the point frequency source module d _2＝RF1+(IF-B/2)+f DDS Wherein f DDS Is the signal generator baseband signal frequency.
In a further embodiment, the control unit further comprises man-machine interaction functions, including a system real-time control module, a zero-slot controller, a display screen and a keyboard.
In a further embodiment, the radar echo signal simulation device further comprises a case and a structural system, wherein the case, the power supply, the bus back plate and the structural box body are used for installing and fixing the microwave unit, the signal processing unit and the control unit and supplying power to the units.
According to a second aspect of the embodiment, as shown in fig. 2, there is provided a wideband step-frequency radar echo signal simulation method, including the following steps:
receiving subcode radio frequency signals transmitted by the step frequency radar;
determining the synthesis bandwidth of the step frequency radar transmitting signal according to the number of subcodes of the received subcode radio frequency signal and the bandwidth of the subcode linear frequency modulation signal;
a radar echo signal is generated through a path when the 1 st to (N/2-1) th subcode signals arrive, and a radar echo signal is generated through a second path when the N/2 th to N th subcode signals arrive.
The first path is as follows:
the received radar subcode radio frequency signal is subjected to frequency source of a first point of a local oscillation module I, a frequency down conversion assembly II and a frequency down conversion assembly II to obtain a frequency signal subjected to frequency down conversion, and after the delay of the signal, an echo signal is transmitted, and the echo signal is subjected to frequency source of a first point of a frequency up conversion assembly I and a frequency up conversion assembly II and the frequency down conversion assembly I to obtain the frequency signal subjected to frequency up conversion as a radar echo signal.
The second path is:
the received radar subcode radio frequency signal is subjected to frequency source and frequency down conversion by a local oscillation module I, a frequency down conversion assembly I, a second point frequency source of the local oscillation module II and the frequency down conversion assembly II to obtain a frequency down converted radio frequency signal, and after the time delay of the signal, and transmitting an echo signal, wherein the echo signal is used as a radar echo signal by obtaining an up-converted radio frequency signal through a second point frequency source of the up-conversion assembly I, the local oscillation module II, the up-conversion assembly II and the local oscillation module I.
In a specific embodiment, as shown in fig. 3, the step frequency system X-band coupling signal emitted by the wideband step frequency radar is composed of 64 subcodes, each subcode is a linear frequency modulation signal with a bandwidth of 20MHz, the time width of the subcode is 64us, the signal center frequency of adjacent subcodes is increased by 10MHz in a step manner, and the subcode interval is 100us, so that the 640MHz signal bandwidth is synthesized;
a wideband step-frequency radar output signal comprising: the radio frequency emission signal is an X-band signal of 64 subcodes, a frame synchronization signal, a pulse synchronization signal and the like; a frame synchronization signal and a pulse synchronization signal, the rising edge of which is generated by the advance signal 40 us.
The signal bandwidth of the signal processing unit of the radar echo signal simulation device is 500MHz, and the frequency of the local oscillation module II is switched on the basis of the bandwidth signal source to adapt to the 640MHz step frequency system signal with the synthesized bandwidth.
In the test flow, the furthest acting distance of the radar is 8km, and the maximum delay value is 53.33us; the pulse interval PRT of the radar transmit subcode is 100us.
The processing procedure of the radar echo simulator receiving down-conversion frequency conversion is shown in fig. 4, and the frequency selection setting of the transmitting up-conversion is the same, and will not be described here again.
The radar echo signal simulation device receives subcode radio frequency signals transmitted by the radar, delays according to a set value and transmits output echo signals; the local oscillation module comprises 2 local oscillation modules, lo1 is a first local oscillation module, lo2 is a second local oscillation module, the second local oscillation module comprises a DDS baseband source and a four-way point frequency source module, and two point frequency sources of a second local oscillation are realized through frequency mixing; in the scheme, four-way point frequency source modules are provided, the frequency interval of the 4 point frequency sources is 500MHz, only two of the point frequency sources are used in the actual working process, and the signal switching of two modules in the four-way point frequency source modules is performed when the number of the step frequency synchronizing signals reaches half of the total number.
The number of subcodes of the known broadband step-frequency radar transmission signal is n=64, and the subcode pulse number is counted by the radar echo signal simulation device by introducing the synchronous pulse signal into the radar echo signal simulation device.
The frequency range of the broadband stepping frequency radio frequency signal received by the radar echo signal simulation device is 9.28G-9.6 GHz and 9.6G-9.92 GHz, meanwhile, the filter design processed by the first down-conversion component in the hardware system is determined, the filter is an S-band signal filter with the bandwidth of B1=2GHz, and the frequency range is RF 1+/-B1/2, namely 3.5G-3.82 GHz and 3.18G-3.5 GHz; the frequency of the broadband local oscillation source used by the local oscillation module I is Lo1=RF1+RF, namely 13.1GHz; the filter processed by the second down-conversion component is also designed to be an intermediate frequency signal filter with the bandwidth of B1=2 GHz, and the frequency range is IF+/-B/2, namely 0.73G-1.05 GHz and 0.55G-0.87 GHz, so that the frequency source signal of the second local oscillator module and the frequency of the four-way point frequency source clock signal to be selected are calculated;
when the 1 st to (N/2-1) sub-code signals arrive, the frequency Lo2_1 of the second point frequency source of the local oscillation module is used, and when the N/2-N sub-code signals arrive, the frequency Lo2_2 of the second point frequency source of the local oscillation module is used;
where lo2_1=rf1+ (if+b/2) =4.05 GHz, lo2_2=rf1+ (IF-B/2) =4.55 GHz;
the frequency of the local oscillation module II is DDS baseband signal frequency f DDS Sum point frequency source module f d Mixing, i.e. lo2=f d -f DDS The method comprises the steps of carrying out a first treatment on the surface of the The clock frequency of the dot frequency module is f d ＝Lo2+f DDS ；
Therefore, when the 1 st to (N/2-1) th subcode signal arrives, the clock frequency f of the point frequency source module d _1＝RF1+(IF+B/2)+f DDS ＝4.05+0.87=4.92 GHz, when the N/2-N subcode signals arrive, the clock frequency f of the point frequency source module d _2＝RF1+(IF-B/2)+f DDS =4.55+0.87=5.42 GHz; the clock frequency of the other two point frequency source modules can be used as a standby, and the radar analog signal simulation system is used when radar analog signals with other frequencies are required to be simulated.
Before the N/2 sub-code pulse arrives, the radar echo signal simulation device switches the local oscillator, namely switches the clock frequency of a four-way point frequency source module in the second-stage local oscillator, so that the received radar emission signal falls into the frequency band of the signal source, is normally received and is forwarded in a delayed mode.
The radar echo signal simulation device fully utilizes the intermediate frequency bandwidth of B=500 MHz, and aims at the radar step frequency signal of Ba=640 MHz, only rapidly changes the local oscillation once, and reduces the coherence loss.
The radar echo signal simulation device carries out up-down frequency conversion respectively and comprises two stages of frequency conversion, the same local oscillator is used, the frequency is rapidly switched, and the phase relativity of output signals is realized by adopting a mode of switching four-way point frequency sources of a local oscillator component II; resetting the local oscillator component I and the DDS baseband source can bring about the phase change of the output signal, and the phase relativity cannot be ensured.
In summary, the wideband step-by-step frequency radar echo signal simulation device and method provided by the invention have at least the following advantages compared with the prior art:
(1) According to the invention, the frequency is not changed by the first local oscillation module, the second local oscillation module rapidly switches the point frequency source, so that the simulation of the broadband step frequency radar echo signal is completed under the condition of narrower signal processing bandwidth, and the phase relativity of the output signal is realized by switching the point frequency source of the second local oscillation module;
(2) The invention does not increase the hardware change design of the intermediate frequency signal processing bandwidth, realizes the simulation of the broadband step-by-step frequency radar echo signal through the local oscillator point frequency source switching and the software design, increases the flexibility of the system design and reduces the system development cost.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The broadband step-by-step frequency radar echo signal simulation device is characterized by comprising a microwave unit, a signal processing unit and a control unit, wherein the microwave unit comprises a receiving down-conversion component, a local oscillation module and a transmitting up-conversion component, the receiving down-conversion component comprises a first down-conversion component and a second down-conversion component, the transmitting up-conversion component comprises a first up-conversion component and a second up-conversion component, the local oscillation module comprises a first local oscillation module and a second local oscillation module, the microwave unit transmits received radio frequency to the signal processing unit after passing through the first local oscillation module, the first down-conversion component, the second local oscillation module and the second down-conversion component, processes a frequency conversion signal to generate an echo signal, and transmits the echo signal to the first transmitting up-conversion component, the second local oscillation module, the first local oscillation module and the second transmitting up-conversion component, and the second transmitting up-conversion component convert the echo signal and transmit the echo signal; the local oscillation module comprises at least two point frequency sources, wherein when the number of the received signals is N/2, a first point frequency source is used, and when the number of the received signals is N/2, a second point frequency source is used, wherein N is the number of the received step frequency radar subcode radio frequency signals; the control unit is linked with the microwave units and controls the signal transmission path between the microwave units and the point frequency source switching of the local oscillation module II.
2. The wideband step-by-step frequency radar echo signal simulating apparatus of claim 1, wherein the signal processing unit has a signal bandwidth greater than half of the composite bandwidth of the step-by-step radar signal.
3. The wideband step-by-step radar echo signal simulator of claim 1, wherein the local oscillator module one has a frequency lo1=rf1+rf, and wherein: RF is the center frequency of the received RF signal, and RF1 is the center frequency of the received RF signal after the first stage of down-conversion.
4. The wideband step-by-step frequency radar echo signal simulator of claim 1, wherein the first point frequency source frequency in the second local oscillator module is: lo2_1=rf1+ (if+b/2), wherein IF is the center frequency of the second-stage down-conversion of the received radio frequency signal, and B is the signal bandwidth of the signal processing unit; the second point frequency source frequency in the local oscillation module II is as follows: lo2_2=rf1+ (IF-B/2).
5. The wideband step-by-step frequency radar echo signal simulator of claim 1 or 4, wherein the second local oscillator module further comprises a signal generator, and the signal generator mixes with the point frequency source to generate two frequencies provided by the second local oscillator module.
6. The wideband step-by-step frequency radar echo signal simulator of claim 5, wherein the clock frequency f of the dot-frequency source module is set at the arrival of the 1 st to (N/2-1) subcode signals d _1＝RF1+(IF+B/2)+f DDS When the N/2-N subcode signals arrive, the clock frequency f of the point frequency source module d _2＝RF1+(IF-B/2)+f DDS Wherein f DDS Is the signal generator baseband signal frequency.
7. A wideband step-wise frequency radar echo signal simulation method using a wideband step-wise frequency radar echo signal simulation device according to any one of claims 1 to 6, wherein the method comprises the steps of:
receiving subcode radio frequency signals transmitted by the step frequency radar;
determining the synthesis bandwidth of the step frequency radar transmitting signal according to the number of subcodes of the received subcode radio frequency signal and the bandwidth of the subcode linear frequency modulation signal;
generating radar echo signals through paths when 1 st to (N/2-1) th subcode signals arrive, and generating radar echo signals through paths II when N/2 nd to N th subcode signals arrive;
the first path is as follows:
the method comprises the steps that a received radar subcode radio frequency signal is subjected to frequency down conversion through a first point frequency source of a local oscillation module I, a frequency down conversion module II and a frequency down conversion module II, an echo signal is transmitted after signal delay, and the echo signal is subjected to frequency up conversion through a first point frequency source of an upper conversion module I, a first point frequency source of a local oscillation module II, a frequency up conversion module II and a local oscillation module I to serve as a radar echo signal;
the second path is:
the received radar subcode radio frequency signal is subjected to frequency source and frequency down conversion by a local oscillation module I, a frequency down conversion assembly I, a second point frequency source of the local oscillation module II and the frequency down conversion assembly II to obtain a frequency down converted radio frequency signal, and after the time delay of the signal, and transmitting an echo signal, wherein the echo signal is used as a radar echo signal by obtaining an up-converted radio frequency signal through a second point frequency source of the up-conversion assembly I, the local oscillation module II, the up-conversion assembly II and the local oscillation module I.
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