Processing of Synthetic Aperture Radar

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The absolute value of the shift amount increases in proportion to the absolute Doppler frequency. The absolute value of the shift amount is usually less than in the range direction sampling interval, the distance in the arrangement azimuth direction along the locus of R, to generate the amplitude modulation of the azimuth direction. The amplitude modulation of the azimuth direction, azimuth ambiguity occurs synthetic aperture radar image.


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However, synthetic aperture radar device of the first embodiment, by controlling the chirp corresponding to the pointing direction of the radar, suppressing the shift of the peak position after range compression. As a result, it is possible to suppress azimuth ambiguities occurring synthetic aperture radar image. Next, a description will be given of a control method of the chirp in the synthetic aperture radar device according to the first embodiment. However, changing the absolute value of the chirp is performed with meeting the set range of the parameters are constrained from the hardware performance, and the desired swath and resolution, etc.

Here, theta [eta] is a beam steering angle in azimuth time eta. The absolute value of the chirp is a value obtained by dividing the transmission bandwidth by the transmission pulse width. However, during observation, because the range resolution is to fix the so transmission bandwidth is constant, the change of the absolute value of the chirp is performed by changing the transmission pulse width. Changing the absolute value of chirp according to formula 1 is shorter pulse width when the beam steering angle theta [eta] is greater then large chirp , theta [eta] long pulse width in the case is small equivalent to the chirp decreases to.

Incidentally, shortening the pulse width reduces the signal power per one pulse, the signal power is increased the longer the pulse width. Signal power of synthetic aperture radar images, since that is determined by the integration of multiple pulses, to ensure that the signal power be changed absolute value of the chirp becomes equivalent to the case of fixing the chirp, synthetic aperture time average of the absolute value of the chirp at the inner is set to be the absolute value equivalent to the previous chirp changes.

Next, a description will be given why the radar control unit changes the absolute value of the chirp in accordance with the beam steering angle in azimuth time eta.

Space-time-frequency processing of synthetic aperture radar signals - IEEE Journals & Magazine

The position of the peak after range compression in consideration of the movement of the radar in the pulse transmission and reception tau peak [eta] is given by equation 2. Here, tau 0 [eta] is the wave of the round-trip time between the radar and the point target in azimuth time eta when the stop-and-go approximation, equivalent to one-dot chain line in FIG. In the formula 2 , the second term represents the shift amount of the peak generated by the influence of the radar is moved during a pulse transmission and reception.

The shift amount is proportional to the value S shown in Equation 1 , the sign is inverted depending on the sign of the chirp. Therefore, to minimize the S, by changing the absolute value of the chirp, it is possible to suppress the shift of the peak generated by the influence of the radar is moved during a pulse transmission and reception. Again, return to the description of the operation using a flowchart. In step ST, the received signal received by the synthetic aperture radar device is digitally processed and stored in the data recording unit by the digital processing unit Further, in the data recording unit , the transmission signal corresponding to the received signal, the chirp of the transmission signal, the beam steering angle at the time of transmission of the transmission signal is also recorded.

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Data transmission unit , and transmits the read out data recorded in the data recording unit to the ground. Next, at step ST , the signal processor receives the data transmitted from the data transmission unit , and stores the data recording apparatus In step ST , DFT section reads the data stored in the data recording apparatus , and DFT process the received signals in the range direction. In step ST , the compensation unit , on the received signal Fourier transform to the range direction is multiplied by a complex function given by Equation 3.

Equation 3 is a complex function generated based on the orientation of the chirp and the radar beam in accordance with the azimuth time. Thus, peak shift on range time occurring with the radar movement during the pulse transmission and reception, i.

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Here, f tau Range Frequency, R [eta] denotes the distance between the directional center point and the radar of the radar beam to be set in order to determine the pointing direction of the radar beam in the azimuth time eta. In the formula 3 , the first term to compensate for the peak shift that occurs with the radar movement during the pulse transmission and reception, the second term to compensate the phase variation.

Here, it gave a function to compensate for the peak shift due to radar movement during the pulse transmission and reception by the formula 3 is not limited thereto and may be a function having the same function. In step ST , the pulse width equalization unit multiplies a complex function given by Equation 4 to the signal after compensating for peak shift, removing the chirp in the range direction. Complex function given by equation 4 is a complex function based on the chirp corresponding to the azimuth time. Here, in order to remove the chirp in the range direction, but using the complex function given by Equation 4 is not limited to this, for example, obtained by Fourier transform of the replica signal in the range direction function etc.

In the case of using a function obtained by Fourier-transforming a replica signal of the transmission signal in the range direction, in step ST , DFT section may perform range direction Fourier transform of a replica signal of the transmission signal. In step ST , the pulse width equalization unit is further multiplied by a complex function given by Equation 6 to the signal after removal of chirp in the range direction, adds a fixed chirp in the range direction. Here, K r, uni is a predetermined char plate. Here, in order to add the chirp in the range direction, but using the complex function given by Equation 6 is not limited to this, and may be a function having the same function.

IDFT processed signal is a signal equivalent to the case of observing in a fixed chirp.


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The image reproduction processing is, for example, as shown in Non-Patent Document 1, range Doppler algorithm, chirp scaling algorithm, such as omega K algorithm may be used general image reconstruction algorithm. In step ST, when storing the synthetic aperture radar image by the image reproducing unit is obtained as a result of the image reproduction processing in the data recording apparatus , the series of processing ends.

As described above, synthetic aperture radar apparatus according to the first embodiment emits a transmission signal, an antenna unit for receiving the transmission signal reflected by the target, and generates a transmission signal by inter-pulse modulation antenna a transmitting unit that transmits to the section , a receiving unit for outputting the transmission signal received by the antenna unit as a reception signal, generated by the transmission unit based on the orientation direction of the radar beam radiated from the antenna portion and a radar control unit for controlling the chirp of that transmission signal.

With such a configuration, synthetic aperture radar device , so changes the chirp in accordance with the beam steering angle at the time of observation, it is possible to suppress the peak shift after range compression generated by the radar movement during the pulse transmission and reception.

As a result, prevent the occurrence of amplitude modulation due to the generation of peak shift, it is possible to reproduce a synthetic aperture radar image without causing the azimuth ambiguity. The signal processing apparatus according to the first embodiment is an apparatus for processing a received signal received by the synthetic aperture radar device , based on the orientation of the chirp and the radar beam of the transmission signal corresponding to the received signal Te, and a compensation unit to compensate for the peak shift in the range direction which occurs along with the radar movement upon receiving a received signal.

Compensation unit by the multiplication of the complex function in the range frequency space, since the compensation process of the peak shift after range compression caused by radar movement during the pulse transmission and reception, prevent the occurrence of azimuth ambiguity without increasing the computational load be able to. Furthermore, in the synthetic aperture radar device , even when the peak shift change chirp corresponding to the beam steering angle can not be completely suppressed by the compensation processing based on the orientation of the chirp and the radar beam of the transmitted signal, it is possible to compensate for the remaining peak shift.

Further, according to the signal processing apparatus of Embodiment 1, multiplied by a fixed value the chirp rate of the observation data of the complex function of the range frequency space, that is aligned pulse width to a fixed value, typical char observation data plate to equalize the observed data and that obtained in the observation that the fixed.

As a result, without the need for any changes to the image reconstruction algorithm, it can be used as it is an existing image playback processing. Furthermore, according to the signal processing device of this embodiment 1, since to compensate for the peak shift after range compression by radar movement during pulse received per azimuth time, any range chirp for each azimuth time by the interpulse modulation it is possible to deal with the changeover.

Ref document number : Country of ref document : JP. Kind code of ref document : A.

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Country of ref document : EP. Kind code of ref document : A1. Ref country code : DE. Due to the impact of movement on a synthetic aperture radar device during observation, the frequency of a reception signal is changed from the frequency at the time of transmission. As a result of this kind of Doppler effect, there has been a problem such that azimuth ambiguities are generated in a synthetic aperture radar image.

This synthetic aperture radar device is provided with the following: an antenna unit that emits a transmission signal and receives a transmission signal reflected by a target; a transmission unit that generates a transmission signal by inter-pulse modulation and transmits the same to the antenna unit; a reception unit that outputs, as a reception signal, the transmission signal received by the antenna unit; and a radar control unit that controls the chirp rate of the transmission signal generated by the transmission unit, on the basis of the orientation direction of the radar beam emitted from the antenna unit.

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Due to this configuration, with respect to a range-compressed reception signal, range-direction peak shift arising due to the impact of Doppler effect can be compensated for, and azimuth ambiguity generated in a synthetic aperture radar image can be suppressed. Synthetic aperture radar and signal processor The present invention is a radio wave that is modulated between pulses emitted toward the target, it receives the radio wave reflected by the target synthetic aperture radar system, and a signal for performing image reproduction processing of the received signal received by the synthetic aperture radar system it relates to processing apparatus.

JP JP I. An antenna portion for transmitting signals to the radiation, receiving the transmission signal reflected by the target, A transmitter for transmitting to said antenna unit to generate the transmission signal by inter-pulse modulation, A receiving unit which outputs the transmission signal received by the antenna portion as a reception signal, Synthetic aperture radar device and a radar control unit that controls the chirp of the transmission signal generated by the transmitting unit on the basis of the pointing direction of the radar beam radiated from the antenna unit. The radar control unit, synthetic aperture radar system according to claim 1, wherein the controller controls so that the chirp of the transmission signal according to the beam steering angle of the radar beam emitted increases increases from said antenna portion.

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Keywords: synthetic aperture radar SAR autofocus imaging backprojection digital signal processing. Issue Date: Metadata Show full item record. Publisher: The Ohio State University. Abstract: This project focuses on the implementation of image processing software for a drone-based synthetic aperture radar SAR system.

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