CN110609276B - Broadband monopulse tracking radar system with parabolic antenna - Google Patents
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Abstract
The invention discloses a broadband monopulse tracking radar system with a parabolic antenna, belongs to the technical field of radar detection and tracking, and can obtain more accurate target distance and angle measurement results. The system specifically comprises: the transmitting subsystem generates a transmitting signal under the action of the radio frequency excitation signal and outputs the transmitting signal. And the antenna feed subsystem receives the target echo signal, performs coupling correction and outputs the target echo signal. The frequency integration subsystem generates a radio frequency excitation signal to the transmitting subsystem and a receiving local oscillator signal to the receiving subsystem under the control of the control information. The receiving subsystem obtains a target echo signal and a receiving local oscillator signal, performs down-conversion processing to intermediate frequency, and outputs the intermediate frequency to the signal processing subsystem. The signal processing subsystem carries out digital down-conversion on the target echo signal to a baseband, then carries out amplitude and phase compensation and digital sum-difference processing to obtain a sum channel signal, a pitch difference channel signal and a azimuth difference channel signal, and further obtains the distance and the angle of the target and inputs the distance and the angle to the display control subsystem for display.
Description
Technical Field
The invention relates to the technical field of radar detection and tracking, in particular to a broadband monopulse tracking radar system with a parabolic antenna.
Background
With the development of scientific technology, people can position radar, and not only can target detection be realized, but also future war is war integrating sea, land, air and sky, and observation of various targets in space such as artificial satellites, ballistic missiles, space debris and baits is the primary task of radar. In order to meet the requirements of complex scenes such as space target detection and identification, the narrow-band radar cannot meet the requirements at the present stage. Compared with a narrow-band radar, the broadband radar can provide rich target information for detection, tracking and identification, and has great significance for clutter suppression, electronic countermeasure and anti-stealth target detection. For the broadband radar, the distance tracking measurement precision is far higher than the angle tracking precision, so the angle measurement performance is an important factor for limiting the broadband radar to realize high-precision target tracking. The existing radar angle measurement means comprise a sequential lobe method, a cone scanning method, a monopulse angle measurement method and the like, wherein the monopulse angle measurement method adopts a method of simultaneously comparing antenna beams and has the advantages of high angle measurement speed, high angle measurement precision and the like, so that the existing radar mostly adopts a monopulse technology to measure angles.
Compared with a narrow band, the broadband single-pulse angle measurement faces more non-ideal factors, is more sensitive to amplitude and phase inconsistency and even polarization inconsistency among channels, and is not beneficial to improvement of angle measurement precision. Regardless of the polarization characteristic of the front end of the antenna, the broadband monopulse angle measurement mainly has the following problems:
firstly: due to the high resolution characteristic, a target at a multi-scattering point becomes a distance extension target, echo energy is dispersed to more distance units and larger noise power is introduced, so the signal-to-noise ratio on a single distance unit is reduced (), and the angle measurement performance is deteriorated;
secondly, the method comprises the following steps: non-ideal factors such as amplitude and phase inconsistency exist among different channels of the system. Non-ideal factors can be divided into two categories: one is that the antenna pattern has inconsistent response at different frequency points in the broadband. Secondly, the broadband frequency response of all receiving channels is inconsistent.
The inconsistency of the frequency response of the antenna pattern and the back-end receive channel adversely affects the angle measurement. Under narrow band conditions, the frequency response of the antenna pattern and the back-end receiving channel can be considered to be an approximation of a single frequency point. At the moment, the received baseband signal only has amplitude phase error at the frequency point, and the problem can be solved by multiplying a corresponding error compensation factor. Under the broadband condition, the baseband signals passing through the antenna and the receiving channel have different amplitude and phase errors at different frequency points, and full-band compensation is required. On the other hand, in the traditional amplitude sum and difference monopulse system, a magic T mixer is used for sum and difference at a radio frequency front end or a medium frequency, and then a sum difference and difference three-channel signal is subjected to down-conversion to a baseband angle measurement. If the broadband frequency responses of the antenna feeder line in front of the sum and difference device and the receiving channels are not consistent, the antenna feeder line and the receiving channels cannot be compensated after the sum and difference device is used, and further the angle measurement accuracy is influenced.
Therefore, how to design a broadband monopulse tracking radar system to obtain more accurate target distance and angle measurement results is a problem to be solved.
Disclosure of Invention
In view of the above, the present invention provides a broadband monopulse tracking radar system with a parabolic antenna, which is capable of processing a target signal and performing digital amplitude-phase compensation before performing sum-difference, so as to obtain more accurate target distance and angle measurement results.
In order to achieve the purpose, the technical scheme of the invention is as follows: a parabolic antenna broadband monopulse tracking radar system, comprising: an antenna feed subsystem, a transmitting subsystem, a frequency synthesizing subsystem, a receiving subsystem, a signal processing subsystem and a display control subsystem.
The transmitting subsystem is used for generating and outputting a transmitting signal under the action of the radio frequency excitation signal.
The antenna feed subsystem receives a target echo signal by adopting a parabolic antenna, and outputs the target echo signal after coupling correction.
The frequency integrated subsystem generates radio frequency excitation signal under the control of the control information from the display control subsystem, outputs the radio frequency excitation signal to the transmitting subsystem to participate in the generation of transmitting signal, and simultaneously generates receiving local oscillator signal to input the receiving subsystem.
The receiving subsystem obtains a target echo signal and a receiving local oscillator signal, performs down-conversion processing on the target echo signal and the receiving local oscillator signal to intermediate frequency, and outputs the intermediate frequency to the signal processing subsystem.
The signal processing subsystem performs digital down-conversion on a target echo signal to a baseband, then performs amplitude and phase compensation to obtain an amplitude-phase compensated signal, then performs digital sum-difference processing on the amplitude-phase compensated signal to obtain a sum channel signal, a pitch difference channel signal and an azimuth difference channel signal, and finally obtains the distance and the angle of the target according to the sum channel signal, the pitch difference channel signal and the azimuth difference channel signal and inputs the distance and the angle to the display control subsystem for display.
And further, the transmitting subsystem comprises a power divider and a circulator, and after the transmitting subsystem generates a transmitting signal, the transmitting signal is divided into four paths by the power divider and output by the circulator.
Furthermore, the antenna feed subsystem comprises four horn feed sources, four receiving channels and a coupling correction channel; one of the horn feed sources is connected with one of the receiving channels; target echo signals enter a receiving channel through a horn feed source; one receiving channel comprises a circulator, a coupler and a field effect tube which are connected in sequence; the coupling correction channel specifically comprises: the signal source for calibration is respectively connected to the input ends of the calibration signals of the four couplers through power division, and the calibration signals are input to the rear end through the couplers.
Further, the radio frequency excitation signal generated by the frequency integration system comprises: and generating a transmitting local oscillator signal and an intermediate frequency signal, and performing up-conversion to obtain a radio frequency excitation signal.
Furthermore, the signal processing subsystem comprises an intermediate frequency acquisition control module, an amplitude-phase compensation module, a digital sum-difference module and a parameter estimation module.
And the intermediate frequency acquisition control module performs digital down-conversion on the target echo signal to a baseband.
And the amplitude and phase compensation module is used for compensating the amplitude and the phase of the target echo signal of the digital baseband to obtain an amplitude and phase compensated signal.
And the digital sum difference module is used for carrying out digital sum difference on the signals after amplitude and phase compensation to obtain sum channel signals, pitch difference channel signals and azimuth difference channel signals.
And the parameter estimation module acquires the distance and the angle of the target according to the sum channel signal, the pitch difference channel signal and the azimuth difference channel signal.
Further, the four receiving channels are respectively an a channel, a B channel, a C channel and a D channel.
In the digital sum and difference module, the high-resolution distance images of the signals after amplitude and phase compensation corresponding to the channels A, B, C and D are respectively p1、p2、p3、p4。
Then the sum channel signal is the high resolution range profile p of the sum channelsum＝p1+p2+p3+p4。
High resolution range profile p with azimuth difference channel signal as azimuth difference channelazi＝p1+p4-p2-p3。
The pitch difference channel signal is a pitch difference channel high-resolution range profile pele＝p1+p2-p3-p4。
Further, the amplitude and phase compensation module compensates the amplitude and phase of the target echo signal of the digital baseband to obtain an amplitude and phase compensated signal, which specifically comprises:
the transmitting signal is a frequency stepping synthesis broadband signal; channel 1 was chosen as the reference channel.
Aiming at a target echo signal of a digital baseband, acquiring an intra-pulse amplitude phase error factor of the ith sub-pulse of a k channel relative to the ith sub-pulse of a reference channel
And N is the number of frequency hopping points of the frequency stepping synthesis broadband signal.
Wherein c iski＝A1i/Aki、
A1iIs the amplitude value of the ith sub-pulse of the reference channel, AkiThe amplitude value of the ith sub-pulse of channel k,
is the phase value of the ith sub-pulse of the reference channel,
The phase value of the ith sub-pulse of channel k.
Get t ═ iTr+τ,i＝0...N-1，TrSynthesizing a pulse repetition period of the wideband signal for frequency stepping; tau is the target echo time delay of the frequency stepping synthesis broadband signal; obtaining the maximum value of the amplitudes of different sub-pulses of the echo of the reference channel as
To z'1(iTr+ tau) phase is unwrapped to obtain the maximum value z of amplitude of unwrapped sub-pulse "1(iTr+ tau), maximum value z of amplitude of the unwrapped subpulse "1(iTr+ tau) amplitude and phase fitting to obtain the maximum value z of the fitted sub-pulse amplitude "fix(iTr+τ)。
By z "fix(iTr+ tau) and z "1(iTr+ tau) may obtain the inter-pulse amplitude phase compensation factor
Ci exp{jΔφi},i＝1…N-1；
Wherein C isi＝|z”fix(iTr+τ)|/|z”1(iTr+τ)|，Δφi＝angle{z”fix(iTr+τ)}-angle{z”1(iTr+τ)}；
angle {. is a phase function.
Multiplying ith sub-pulse of k channel in target echo signal of digital baseband by in-pulse amplitude phase compensation factor
Multiplied by an inter-pulse amplitude phase compensation factor
And obtaining the amplitude-phase compensated signal.
Has the advantages that:
the invention provides a broadband monopulse tracking radar system of a parabolic antenna, aiming at the requirement of broadband monopulse angle measurement, which is different from the traditional monopulse outputting sum-difference three-channel signals after radio frequency or intermediate frequency sum-difference. By using the broadband digital amplitude-phase compensation technology, the influence of broadband dispersion and amplitude-phase distortion on angle measurement can be solved. Namely, the system provided by the invention can carry out full-band compensation under the broadband condition, wherein the amplitude and phase errors of baseband signals passing through an antenna and a receiving channel at different frequency points are different; and the target signal can be processed and amplitude and phase compensation can be performed before the digital sum and difference are performed, so that more accurate target distance and angle measurement results can be obtained.
Drawings
Fig. 1 is a block diagram of a broadband monopulse tracking radar system with a parabolic antenna according to an embodiment of the present invention;
fig. 2 is a detailed structural diagram of a parabolic antenna broadband monopulse tracking radar system according to an embodiment of the present invention.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a broadband monopulse tracking radar system of a parabolic antenna, aiming at the requirement of broadband monopulse angle measurement, which is different from the traditional monopulse three-channel signal output after radio frequency or intermediate frequency sum and difference. By using the broadband digital amplitude-phase compensation technology, the influence of broadband dispersion and amplitude-phase distortion on angle measurement can be solved.
As shown in fig. 1, a broadband monopulse tracking radar system with a parabolic antenna according to an embodiment of the present invention includes: an antenna feed subsystem, a transmitting subsystem, a frequency synthesizing subsystem, a receiving subsystem, a signal processing subsystem and a display control subsystem.
The transmitting subsystem is used for generating and outputting a transmitting signal under the action of the radio frequency excitation signal. In the embodiment of the invention, the transmitting subsystem comprises a power divider and a circulator, and after the transmitting subsystem generates the transmitting signal, the transmitting signal is divided into four paths by the power divider and then output by the circulator. As shown in fig. 2.
The antenna feed subsystem receives a target echo signal by adopting a parabolic antenna, and outputs the target echo signal after coupling correction.
In the embodiment of the invention, the antenna feed subsystem comprises four horn feeds, four receiving channels and a coupling correction channel. As shown in fig. 2.
One of the horn feed sources is connected with one of the receiving channels; the target echo signal enters a receiving channel through a horn feed source.
One receiving channel comprises a circulator, a coupler and a field effect tube which are connected in sequence; wherein the circulator and the coupler are matched for transmitting and receiving isolation.
The coupling correction channel specifically comprises: the signal source for calibration is respectively connected to the input ends of the calibration signals of the four couplers through power division, and the calibration signals are input to the rear end through the couplers.
The frequency integrated subsystem generates radio frequency excitation signal under the control of the control information from the display control subsystem, outputs the radio frequency excitation signal to the transmitting subsystem to participate in the generation of transmitting signal, and simultaneously generates receiving local oscillator signal to input the receiving subsystem.
In an embodiment of the present invention, a radio frequency excitation signal generated by a frequency integration system includes: and generating a transmitting local oscillator signal and an intermediate frequency signal, and performing up-conversion to obtain a radio frequency excitation signal.
The receiving subsystem obtains a target echo signal and a receiving local oscillator signal, performs down-conversion processing on the target echo signal and the receiving local oscillator signal to intermediate frequency, and outputs the intermediate frequency to the signal processing subsystem.
The signal processing subsystem performs digital down-conversion on a target echo signal to a baseband, then performs amplitude and phase compensation to obtain an amplitude-phase compensated signal, then performs digital sum-difference processing on the amplitude-phase compensated signal to obtain a sum channel signal, a pitch difference channel signal and an azimuth difference channel signal, and finally obtains the distance and the angle of the target according to the sum channel signal, the pitch difference channel signal and the azimuth difference channel signal and inputs the distance and the angle to the display control subsystem for display.
The signal processing subsystem comprises an intermediate frequency acquisition control module, an amplitude and phase compensation module, a digital sum and difference module and a parameter estimation module.
The intermediate frequency acquisition control module performs digital down-conversion on the target echo signal to a baseband; in particular also a pulse compression process.
The amplitude and phase compensation module compensates the amplitude and phase of the target echo signal of the digital baseband to obtain an amplitude and phase compensated signal;
the digital sum and difference module is used for carrying out digital sum and difference on the amplitude-phase compensated signals to obtain sum channel signals, pitch difference channel signals and azimuth difference channel signals;
the parameter estimation module obtains the distance and the angle of the target according to the sum channel signal, the pitch difference channel signal and the azimuth difference channel signal, wherein the angle comprises an azimuth angle and a pitch angle.
The embodiment of the invention is directed to a specific module of a signal processing subsystem in a system, wherein a transmitting signal is a frequency stepping synthesis broadband signal:
the general model for frequency-stepped synthesis of wideband signals is:
where T is the time axis, u (T) is the sub-pulse baseband modulation signal, TrIs the Pulse Repetition Time (PRT).
fi＝f0+ i Δ f is the carrier frequency of the ith sub-pulse, f0Is the frequency hopping starting frequency, delta f is the inter-pulse frequency hopping interval, and N is the number of frequency hopping points.
For a radar system adopting the new system broadband digital sum-difference monopulse technology in the patent, when an ideal stationary point target is positioned at the visual axis center of an antenna, echo signals received by each channel are respectively
Wherein k ═ {1,2,3,4} represents 4 receive channels; a. thekiRepresenting the echo amplitude of the ith sub-pulse of the kth receiving channel;
representing the echo phase error of the ith sub-pulse of the kth receiving channel; τ represents the target echo delay. The remaining symbols have the same meanings as those of formula (1). The obtained baseband echo signals of each channel are changed into baseband echo signals through down-conversion of a receiving subsystem and down-conversion to a baseband through an intermediate frequency acquisition control module
The intermediate frequency acquisition control module can also perform pulse compression of the sub-pulse, and the baseband echo signals of each channel are changed into baseband echo signals after the pulse compression of the sub-pulse
Wherein sinc (-) is the complex envelope of the sub-pulse after pulse compression. Get t ═ iTr+ tau, obtaining the maximum value of the amplitude of different sub-pulses of each channel echo
To z'k(iTr+ tau) inverse discrete Fourier transform IDFT {. can obtain high resolution one-dimensional range image of each channel
When there is no amplitude phase error in each channel and the ideal stationary point target is located at the visual axis center of the antenna, a in equation (5)ki＝AqmK is not equal to q, i is not equal to m is a constant, and
from the equation (5), the high-resolution one-dimensional range image of each channel is
From (6) and the above analysis, it can be seen that p isazi(n) and pele(n) is 0 and both azimuth and pitch angle measurements are 0.
When there is a different amplitude phase error for each channel, the angle measurement will have an error. The amplitude and phase errors of each channel need to be compensated first, and then angle measurement is carried out. Considering that the bandwidth of the sub-pulse of the frequency-stepping synthesized broadband signal is smaller than the synthesized bandwidth, the amplitude-phase compensation module can compensate the amplitude-phase error of the target echo signal of the digital baseband by using the following method:
the transmitting signal is a frequency stepping synthesis broadband signal; selecting a channel 1 as a reference channel;
aiming at a target echo signal of a digital baseband, acquiring an intra-pulse amplitude phase error factor of the ith sub-pulse of a k channel relative to the ith sub-pulse of a reference channel
N is the number of frequency hopping points of the frequency stepping synthesis broadband signal;
wherein c iski＝A1i/Aki、
A1iIs the amplitude value of the ith sub-pulse of the reference channel, AkiThe amplitude value of the ith sub-pulse of channel k,
is the phase value of the ith sub-pulse of the reference channel,
The phase value of the ith sub-pulse of the channel k;
get t ═ iTr+τ,i＝0…N-1，TrSynthesizing a pulse repetition period of the wideband signal for frequency stepping; tau is the target echo time delay of the frequency stepping synthesis broadband signal; obtaining the maximum value of the amplitudes of different sub-pulses of the echo of the reference channel as
To z'1(iTr+ tau) phase is unwrapped to obtain the maximum value z of amplitude of unwrapped sub-pulse "1(iTr+ tau), maximum value z of amplitude of the unwrapped subpulse "1(iTr+ tau) amplitude and phase fitting to obtain the maximum value z of the fitted sub-pulse amplitude "fix(iTr+ τ), then z is considered "fix(iTr+ tau) substantially coincides with the amplitude and phase of the target echo pulse without error. The inventionIn the embodiment, the statistics of the amplitude and phase errors among the target echo pulses obtained by adopting a fitting method are minimum.
By z'fix(iTr+ tau) and z "1(iTr+ tau) may obtain the inter-pulse amplitude phase compensation factor
Ciexp{jΔφi},i＝1…N-1；
Wherein C isi＝|z”fix(iTr+τ)|/|z”1(iTr+τ)|，Δφi＝angle{z”fix(iTr+τ)}-angle{z”1(iTr+τ)}；
angle {. is a phase taking function;
multiplying ith sub-pulse of k channel in target echo signal of digital baseband by in-pulse amplitude phase compensation factor
Then, multiply by an inter-pulse amplitude phase compensation factor Ciexp{jΔφiAnd obtaining the signals after amplitude and phase compensation. The amplitude-phase compensation is carried out by adopting the method, the statistics of amplitude-phase compensation signal inter-pulse amplitude and phase errors is minimum, and the amplitude-phase compensation signal is used for carrying out digital sum and difference, so that a more accurate angle measurement result can be obtained.
In the embodiment of the invention, four receiving channels are respectively an A channel, a B channel, a C channel and a D channel;
in the digital sum and difference module, the high-resolution distance images of the signals after amplitude and phase compensation corresponding to the channels A, B, C and D are respectively p1、p2、p3、p4；
Then the sum channel signal is the high resolution range profile p of the sum channelsum＝p1+p2+p3+p4；
High resolution range profile p with azimuth difference channel signal as azimuth difference channelazi＝p1+p4-p2-p3；
The pitch difference channel signal is a pitch difference channel high-resolution range profile pele＝p1+p2-p3-p4。
And performing high-resolution imaging on each channel on the basis of the compensated echo data of each channel, and performing azimuth and pitch angle measurement by using a frequency stepping synthesis broadband signal single-pulse angle measurement model.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A parabolic antenna broadband monopulse tracking radar system, comprising: the system comprises an antenna feed subsystem, a transmitting subsystem, a frequency synthesis subsystem, a receiving subsystem, a signal processing subsystem and a display control subsystem;
the transmitting subsystem is used for generating and outputting a transmitting signal under the action of a radio frequency excitation signal;
the antenna feed subsystem receives a target echo signal by adopting a parabolic antenna, performs coupling correction and outputs the signal;
the frequency integration subsystem generates a radio frequency excitation signal under the control of the control information sent by the display control subsystem, outputs the radio frequency excitation signal to the transmitting subsystem to participate in the generation of a transmitting signal, and simultaneously generates a receiving local oscillator signal and inputs the receiving local oscillator signal to the receiving subsystem;
the receiving subsystem obtains the target echo signal and the receiving local oscillator signal, performs down-conversion processing on the target echo signal and the receiving local oscillator signal to intermediate frequency, and outputs the intermediate frequency to the signal processing subsystem;
the signal processing subsystem performs digital down-conversion on the target echo signal to a baseband, then performs amplitude and phase compensation to obtain an amplitude-phase compensated signal, then performs digital sum and difference processing on the amplitude-phase compensated signal to obtain a sum channel signal, a pitch difference channel signal and an azimuth difference channel signal, and finally obtains the distance and the angle of a target according to the sum channel signal, the pitch difference channel signal and the azimuth difference channel signal and inputs the distance and the angle to the display control subsystem for display;
the signal processing subsystem comprises an intermediate frequency acquisition control module, an amplitude-phase compensation module, a digital sum-difference module and a parameter estimation module;
the intermediate frequency acquisition control module performs digital down-conversion on the target echo signal to a baseband;
the amplitude and phase compensation module compensates the amplitude and phase of a target echo signal of the digital baseband to obtain an amplitude and phase compensated signal;
the digital sum and difference module is used for carrying out digital sum and difference on the amplitude-phase compensated signals to obtain sum channel signals, pitch difference channel signals and azimuth difference channel signals;
the parameter estimation module obtains the distance and the angle of a target according to the sum channel signal, the pitch difference channel signal and the azimuth difference channel signal;
the antenna feed subsystem comprises four horn feed sources, four receiving channels and a coupling correction channel;
the four receiving channels are respectively an A channel, a B channel, a C channel and a D channel;
one of the horn feed sources is connected with one of the receiving channels; the target echo signal enters the receiving channel through the horn feed source;
one receiving channel comprises a circulator, a coupler and a field effect tube which are connected in sequence;
the coupling correction channel specifically comprises: the signal source for calibration is respectively connected to the input ends of the calibration signals of the four couplers through power division, and the calibration signals are input to the rear end through the couplers;
in the digital sum and difference module, the high-resolution distance images of the signals after amplitude and phase compensation corresponding to the channel A, the channel B, the channel C and the channel D are respectively p1、p2、p3、p4；
Then the sum channel signal is the high resolution range profile p of the sum channelsum＝p1+p2+p3+p4；
High resolution range profile p with azimuth difference channel signal as azimuth difference channelazi＝p1+p4-p2-p3；
The pitch difference channel signal is a pitch difference channel high-resolution range profile pele＝p1+p2-p3-p4；
The amplitude and phase compensation module compensates the amplitude and phase of the target echo signal of the digital baseband to obtain an amplitude and phase compensated signal, and the amplitude and phase compensated signal specifically comprises the following steps:
the transmitting signal is a frequency stepping synthesis broadband signal; selecting a channel 1 as a reference channel;
aiming at a target echo signal of a digital baseband, acquiring an intra-pulse amplitude phase error factor of the ith sub-pulse of a k channel relative to the ith sub-pulse of a reference channel
N is the number of frequency hopping points of the frequency stepping synthesis broadband signal;
wherein c iski＝A1i/Aki、
A1iIs the amplitude value of the ith sub-pulse of the reference channel, AkiThe amplitude value of the ith sub-pulse of channel k,
is the phase value of the ith sub-pulse of the reference channel,
The phase value of the ith sub-pulse of the channel k;
get t ═ iTr+τ,i＝0…N-1，TrSynthesizing a pulse repetition period of the wideband signal for said frequency steps; tau is the target echo time delay of the frequency stepping synthesis broadband signal; obtaining the maximum value of the amplitudes of different sub-pulses of the echo of the reference channel as
To z'1(iTr+ tau) phase is unwrapped to obtain the maximum amplitude z ″' of unwrapped sub-pulse1(iTr+ tau), maximum value z "for amplitude of sub-pulse after unwrapping1(iTr+ tau) to obtain the maximum value z' of the amplitude of the sub-pulse after fittingfix(iTr+τ)；
Wherein f is0Is the frequency hopping starting frequency, and delta f is the inter-pulse frequency hopping interval;
using z ″)fix(iTr+ τ) and z ″)1(iTr+ τ) may obtain the inter-pulse amplitude phase compensation factor:
wherein C isi＝|z″fix(iTr+τ)|/|z″1(iTr+τ)|，Δφi＝angle{z″fix(iTr+τ)}-angle{z″1(iTr+τ)}；
angle { g } is a phase function;
multiplying ith sub-pulse of k channel in target echo signal of digital baseband by in-pulse amplitude phase compensation factor
Multiplying the multiplied result by an inter-pulse amplitude phase compensation factor Ci exp{jΔφiAnd obtaining the signals after amplitude and phase compensation.
2. The radar system of claim 1 wherein the transmit subsystem includes a power divider and a circulator, and wherein the transmit subsystem generates the transmit signal and then divides the transmit signal into four paths through the power divider and outputs the four paths through the circulator.
3. The system of claim 1, wherein the radio frequency excitation signal generated by the frequency integration system comprises: and generating a transmitting local oscillator signal and an intermediate frequency signal, and performing up-conversion to obtain the radio frequency excitation signal.
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