JP2001141815A - Apparatus and method for receiving/processing signal of radar transponder for search and rescue - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for receiving and displaying an SART(search and rescue transponder) signal surely without requiring a significant modification of SAR. SOLUTION: After transmitting a transmission wave 103 or processing a receiving wave 104 to produce receiving complex data, an SAR transmitting/ receiving section 1 outputs the I component 101 and the Q component 102 of the receiving complex data which are then subjected to SAR processing at an SAR processing section 2 to produce an SAR image real signal 105. Subsequently, an SART processing section 3 extracts an SART signal from the I and Q component signals to produce an SART real signal 106. The SAR image real signal 105 and the SART real signal 106 are received and converted into display signals 107 at an image display section 4 before being presented on a display 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal receiving and processing device for a search and rescue radar transponder suitable for receiving and processing a SART (search and rescue radar transponder) in a SAR (synthetic aperture radar), and a signal receiving and processing device therefor. About the method.

[0002]

2. Description of the Related Art SAR (Synthetic Aperture Radar) is a type of video radar. The SAR (synthetic aperture radar) not only has a higher resolution than other radars, but can be used in all weather, unlike an optical sensor, and is therefore mainly used for earth observation (remote sensing) and the like.

[0003] Such a system using SAR (synthetic aperture radar) is initially used in the field of satellite remote sensing. However, in recent years, the SAR (synthetic aperture radar) has been used due to all weather and high resolution. It is required to be used in the field of sea search.

To meet this demand, for example, FIG.
As shown in the above, it is necessary to detect a distressed ship by imaging the sea surface and to capture and display a signal transmitted by a SART (Search and Rescue Radar Transponder) by radar.

[0005] The SART, as shown in FIG.
When one wave between 9.2 GHz and 9.5 GHz is received once, the frequency between 9.2 GHz and 9.5 GHz is 7.5 μsec.
To sweep. One response transmission has the characteristic that this is repeated 12 times. Here, FIG. 8A shows a radio wave from a radar, and FIG. 8B shows a SART transmission radio wave.

Therefore, when a navigation radar (having a narrow transmission frequency band in the range of 9.2 GHz to 9.5 GHz) mounted on a ship captures a SART signal, FIG.
As shown in (b), a SART signal is displayed as a display of 12 points. FIG. 9A shows a reception state of the navigation radar.

By the way, in the conventional SAR (synthetic aperture radar), a transmission wave having a spectrum shown in FIG. 4A (2) is transmitted according to a chirp wave shown in FIG. Depending on the intensity of the reflected wave from the sea surface or other objects, as shown in (3) of FIG.
The transmission signal may be buried under the SAR reception signal that is a reflected wave.

In this case, as shown in FIG. 10, like a search radar other than the synthetic aperture radar used for marine search, such as a search radar, a SART which is a reception window for SART at a frequency different from the search radar reception signal is used. By providing the reception window, it is possible to reduce the influence that the SART transmission signal cannot be received due to the reflected wave from the sea surface or another object.

[0009]

However, the above-mentioned conventional method is effective for radar having a narrow transmission frequency band, but has a wide SAR band of about 100 MHz.
(Synthetic aperture radar) requires a dedicated device for SART reception. Also, without using such a dedicated device, S
In order to receive the ART signal, the existing SAR (Synthetic Aperture Radar) system needs to be significantly changed.

SUMMARY OF THE INVENTION The present invention has been made in view of such a situation, and ensures reception and display of a SART (Search and Rescue Radar Transponder) signal without requiring a large change in SAR (Synthetic Aperture Radar). And a signal reception / processing apparatus for a search / rescue radar transponder and a signal reception / processing method therefor.

[0011]

According to a first aspect of the present invention, there is provided a signal transceiving apparatus for a radar transponder for search and rescue, which transmits a transmission wave for irradiating an external target such as the ground surface or reflects a reflected wave from the target. After receiving a wave or performing signal processing for converting the received reflected wave into reception complex data, an I component and a Q component of the reception complex data are output.
An AR transmitting / receiving unit, a SAR processing unit that performs SAR processing on each signal of the I component and the Q component of the complex data received from the SAR transmitting / receiving unit, and outputs a SAR image real number signal; A SART processing unit that performs a SART signal extraction process from each of the Q component signals and outputs a SART real number signal, and a display in a format that can be displayed on each signal after receiving the SAR image real number signal and the SART real number signal. An image display unit that converts the signal into a signal and displays the signal on a display. The SAR transmitting / receiving unit includes an antenna unit that transmits a transmission wave and receives a reflected wave, a transmission / reception switching unit that switches transmission and reception of a transmission wave and a reflected wave, a chirp wave generation unit that generates a chirp wave, and a chirp wave generation unit. A transmission unit for transmitting a wave to the antenna unit, a synchronization signal generation unit for providing a synchronization signal indicating a transmission timing to the transmission unit, and providing a pulse repetition frequency (PRF) to the transmission unit and the chirp wave generation unit; A first mixer that performs a mixing process between the reflected wave and the synchronization signal and outputs a first mixing signal, and a first LPF that outputs a first signal component obtained by removing a high-frequency component of the first mixing signal A first A / D conversion unit that converts the first signal component into a digital signal and outputs an I component of the received complex data, a Delay unit that outputs a delayed signal obtained by delaying a synchronization signal, and a reflection unit. A second mixer that performs a mixing process between the second mixing signal and the delayed signal, and outputs a second mixing signal; a second LPF that outputs a second signal component obtained by removing a high-frequency component of the second mixing signal; A second A / D converter that converts the second signal component into a digital signal and outputs a Q component of the received complex data. Further, the SART processing unit performs a complex Fourier transform on the I component and the Q component of the received complex data, and outputs an I component and a Q component of the frequency domain complex signal, and an IFT and a Q component of the frequency domain complex signal. On the other hand, a filter unit that performs low-pass filtering and outputs the I and Q components of the complex signal, and performs a complex inverse Fourier transform on the I and Q components of the complex signal and outputs the I and Q components of the complex signal An IFFT unit and a power conversion unit that converts the power of the I component and the Q component of the complex signal and outputs the SART real number signal can be provided. The signal receiving / processing method of the signal receiving / processing device of the search and rescue radar transponder according to claim 4, wherein the SAR transmitting / receiving unit includes:
After transmitting a transmission wave for irradiating an external target such as the ground surface, receiving a reflected wave from the target, and performing signal processing on the received reflected wave as reception complex data, the reception complex data A first step of outputting the I component and the Q component of the SAR image, and performing SAR processing by the SAR processing unit on each signal of the I component and the Q component of the complex data received from the SAR transmitting / receiving unit. A second step of outputting, a third step of performing a SART signal extraction process by a SART processing unit from each signal of the I component and the Q component of the received complex data and outputting a SART real number signal, and a SAR image real number signal and After receiving the SART real number signal, the image display unit converts each signal into a display signal in a format that can be displayed on the display and displays the signal on the display. Characterized in that it comprises a fourth step. The first step includes a fifth step of transmitting a transmission wave and receiving a reflected wave by the antenna unit, a sixth step of switching transmission and reception of the transmission wave and the reflected wave by the transmission / reception switching unit, A seventh step of generating a chirp wave by the chirp wave generation unit, an eighth step of transmitting the chirp wave to the antenna unit by the transmission unit, and a synchronization signal indicating transmission timing to the transmission unit by the synchronization signal generation unit And a ninth step of providing a pulse repetition frequency (PRF) to the transmission unit and the chirp wave generation unit, and a mixing process of the reflected wave and the synchronization signal by the first mixer,
A tenth step of outputting a first mixing signal;
An eleventh step of outputting a first signal component obtained by removing a high-frequency component of the first mixing signal by the LPF of
A twelfth step of converting the first signal component into a digital signal by the A / D conversion unit and outputting the I component of the received complex data, and a delay unit that outputs a delay signal obtained by delaying the synchronization signal by the Delay unit 13 and a mixing process of the reflected wave and the delayed signal is performed by the second mixer.
A fourteenth step of outputting a mixing signal of
A fifteenth step of outputting, by the PF, a second signal component obtained by removing a high-frequency component of the second mixing signal;
The sixteenth step of converting the second signal component into a digital signal by the / D converter and outputting the Q component of the received complex data can be included. In the second step, the FFT unit performs a complex Fourier transform on the I component and the Q component of the received complex data, and performs the IFT of the frequency domain complex signal.
A seventeenth step of outputting the component and the Q component, and performing low-pass filtering on the I component and the Q component of the frequency-domain complex signal by a filter unit,
An eighteenth step of outputting a component, a nineteenth step of performing an inverse complex Fourier transform on the I and Q components of the complex signal by the IFFT unit, and outputting the I and Q components of the complex signal, The second unit outputs the SART real number signal by converting the power of the I component and the Q component of the complex signal.
0 step can be included. In a signal receiving / processing apparatus and a signal receiving / processing method for a search and rescue radar transponder according to the present invention, a SAR
After transmitting and receiving a transmission wave for irradiating an external target such as the ground surface, receiving a reflected wave from the target, and performing signal processing for receiving the reflected wave as complex reception data by the transmission / reception unit. , Output the I component and the Q component of the received complex data, perform SAR processing on the respective signals of the I component and the Q component of the received complex data from the SAR transmission / reception unit by the SAR processing unit, and output the SAR image real number signal. Then, a SART processing unit performs a SART signal extraction process from the respective signals of the I component and the Q component of the received complex data, outputs a SART real number signal, and receives the SAR image real number signal and the SART real number signal. By converting each signal into a display signal in a format that can be displayed on the display and displaying it on the display, the SAR transmission S In the chirp wave generator Shin portion
A transmission pattern with an ART reception window opened is generated, and the SART processing unit performs SART processing on the complex data after reception.
Can be received and processed.

[0012]

Embodiments of the present invention will be described below.

FIG. 1 is a block diagram showing an embodiment of a signal receiving / processing device of a search and rescue radar transponder according to the present invention, FIG. 2 is a block diagram showing details of an SAR transmitting / receiving section in FIG. 1, and FIG. FIG. 4 is a block diagram showing details of the SART processing unit of FIG. 1; FIG. 4 is a diagram for explaining the operation of the signal receiving / processing device of the search and rescue radar transponder of FIG. 5 is S in FIG. 1 and FIG.
FIG. 6 is a diagram for explaining the operation of the ART processing unit.
FIG. 6 is a diagram showing a display example of the display of FIG.

The signal receiving and processing device of the search and rescue radar transponder shown in FIG. 1 is a SAR (synthetic aperture radar).
SAR transmitting / receiving unit 1, SAR processing unit 2, SART processing unit 3, image display unit 4, display 5
It has.

The SAR transmission / reception unit 1 transmits a transmission wave 103 for irradiating an external target such as the ground surface or receives a reflected wave 104 from the target. Also,
After performing signal processing on the received reflected wave 104, the SAR transmitting / receiving unit 1 outputs an I component 101 and a Q component 102 of the received complex data.

The SAR processing unit 2 performs SAR processing on each signal of the I component 101 and the Q component 102 of the complex data received from the SAR transmitting / receiving unit 1 and outputs a SAR image real number signal 105.

The SART processing unit 3 performs a SART signal extraction process from each signal of the I component 101 and the Q component 102 of the complex data received from the SAR transmission / reception unit 1,
An RT real number signal 106 is output.

The image display unit 4 displays a SAR image real number signal 10.
5 and the SART real number signal 106, the respective signals can be displayed on the display (display signal 1).
07) and display it on the display 5.

FIG. 2 shows the details of the SAR transmitting / receiving section 1.

The SAR transmission / reception unit 1 includes an antenna unit 11, a transmission / reception switching unit 12, a transmitter 13, a synchronization signal generation unit 14, a mixer 15, a delay unit 16, an LPF 17, an A / D conversion unit 18, a mixer 19, an LPF 20, A / D conversion unit 21 is provided.

The antenna section 11 is provided with the transmission wave 103 described above.
And the reflected wave 104 is received. Transmission / reception switching unit 12
Performs switching between transmission and reception of the transmission wave 103 and the reflection wave 104. The transmitter 13 has a transmission unit 13a and a chirp wave generation unit 13b. The transmission unit 13a transmits the chirp wave generated by the chirp wave generation unit 13b.

The synchronizing signal generator 14 supplies a synchronizing signal 201 indicating the transmission timing to the transmitter 13a. Further, the synchronization signal generator 14 supplies a pulse repetition frequency (PRF) to the transmitter 13a and the chirp wave generator 13b.
212. The mixer 15 as the first mixer is
Mixing processing of the reflected wave 104 and the synchronization signal 201 is performed, and a mixing signal 20 as a first mixing signal is processed.
7 is output. The delay unit 16 outputs a delay signal 209 obtained by delaying the synchronization signal 201.

The LPF 17 as the first LPF outputs a signal component 208 as a first signal component from which the high frequency component of the mixing signal 207 from the mixer 15 has been removed.
The A / D conversion unit 18 as the first A / D conversion unit includes an LP
The I component 101 of the received complex data obtained by converting the signal component 208 from F17 into a digital signal is output.

A mixer 19 as a second mixer performs a mixing process on the reflected wave 104 and the delayed signal 209,
It outputs a mixing signal 210 as a second mixing signal. The LPF 20 as a second LPF outputs a signal component 211 as a second signal component from which the high-frequency component of the mixing signal 210 from the mixer 19 has been removed. The A / D conversion unit 21 as a second A / D conversion unit includes an LPF
The Q component 102 of the received complex data obtained by converting the signal component 211 from the digital signal 20 into a digital signal is output.

FIG. 3 shows details of the SART processing unit 3.

The SART processing unit 3 includes an FFT unit 31, a filter unit 32, an IFFT unit 33, and a power conversion unit 34.

The FFT unit 31 performs a complex Fourier transform on the I component 101 and the Q component 102 of the received complex data, and outputs an I component 401 and a Q component 402 of the frequency domain complex signal. The filter unit 32 includes the I component 401 and the Q component 4
02 is subjected to a low-pass filter process, and the complex signal I
The component 403 and the Q component 404 are output.

The IFFT unit 33 includes an I component 40 of the complex signal.
Perform a complex inverse Fourier transform on the 3 and Q components 404,
An I component 405 and a Q component 406 of the complex signal are output.
The power conversion unit 34 has its I component 405 and Q component 406
And outputs a SART real number signal 106.

Next, the operation of the signal receiving / processing device of the search and rescue radar transponder having such a configuration will be described.

The operation of the SAR transceiver 1 in FIG.
Except for the chirp wave generator 13b in FIG.
Same as AR.

First, the synchronization signal generator 14 shown in FIG.
Transmitting frequency 13 (PRF) 212 to transmitter 13a and
The signal is output to the chirp wave generator 13b. Synchronous signal generation
The unit 14 is expressed by the following equation synchronized with the PRF 212.
The signal f which is the synchronization signal 201 ₀(T) is generated, and the transmission unit is generated.
13a, the mixer 15 and the delay unit 16.

F ₀ (t) = cos (Fc · t) −τ / 2 <t ≦ τ / 2 Fc: Transmission Center Frequency Chirp Wave 301 Generated by Chirp Wave Generator 13 b
In the case of the conventional SAR, if the pulse width is τ as shown in (1) of FIG. 4A, the signal f (t) is f (t) = cos2π ((k / 2 · t)・ T) −τ / 2
<T ≦ τ / 2 k: chirp rate

On the other hand, in the present embodiment, the SART
4b, when f (t) = cos2π ((k / 2 · t) · t), −τ / 2 <t ≦ −δt / 2, as shown in FIG. When δt / 2 <t ≦ τ / 2 f (t) = 0, −δt / 2 <t ≦ δt / 2 k: chirp rate

The chirp wave generating section 13b has a pulse repetition frequency (PRF) 2 output from the synchronization signal generating section 14.
12 and the chirp wave 3 generated as described above
The signal f (t) that is 01 is output to the transmitting unit 13a.

The transmitting section 13a combines the signal f (t), which is the chirp wave 301, and the signal f ₀ (t), which is the synchronizing signal 201, to generate a transmission wave 103. The transmission / reception switching section 12 and the antenna section 11 Output to the space via.

As shown in (1) and (2) of FIG. 4B, by transmitting such a waveform as the transmission wave 103, δf = k · δ near the center of the transmission spectrum.
There is a portion where the transmission of the SAR at t is not performed.

Therefore, as shown in the spectrum of the reflected wave 104 which is the received wave shown in (3) of FIG. 4 (b), that part becomes the window for the SART reception, and the SART transmission signal and the SAR
It is possible to always separate the received signal from the received signal. In this regard,
In the spectrum of the conventional SAR shown in (3) of FIG. 4A, since the SART transmission wave is buried in the SAR reception signal, it is impossible to always separate the SART transmission signal from the SAR reception signal. Becomes

In this case, however, the SAR transmission frequency band is 9.2 GHz to 9.2 GHz, which is the SART signal band.
The condition is that it is within the range of 5 GHz.

When the antenna section 11 shown in FIG. 2 receives the reflected wave 104 from a target such as the sea surface or a ship after transmitting the transmitted wave 103, the reflected wave 104 is transmitted through the transmission / reception switching section 12 to the mixer 12. 15, output to the mixer 19.

The mixer 15 uses the signal f ₀ (t), which is the synchronization signal 201, and the reflected wave 104, and outputs a mixing signal 207 obtained by removing the transmission center frequency Fc from the reflected wave 104 to the LPF 17. The LPF 17 converts the signal component 208 obtained by removing the high frequency component from the mixing signal 207 into an A / A signal.
Output to the D conversion unit 18. The signal component 208 is subjected to A / D conversion by the A / D converter 18 and becomes the I component 101 of the received complex data.

On the other hand, the mixer 19 outputs the reflected wave 104 and D
The signal f which is the synchronization signal 201 by the
_Using the delayed signal 209 whose phase of ₀ (t) is shifted by π / 2, a mixing signal 210 is generated by removing the transmission center frequency Fc from the reflected wave 104 and output to the LPF 20.
The mixing signal 210 is converted into a signal component 211 by removing a high-frequency component from the mixing signal 210 by the LPF 20, and then A / D converted by the A / D converter 21 to be a Q component 102 of the received complex data.

In the SART processing unit 3 shown in FIGS. 1 and 3, the I component 101 and the Q component 102 of the complex signal output from the SAR transmission / reception unit 1 are Fourier-transformed by the FFT unit 31, and the complex signal after the Fourier transformation is performed. I component of signal 4
01 and Q component 402. The spectrum at this time is as shown in FIG.

The filter section 32 generates a filter that passes δf shown in FIG. 5B, and filters the I component 401 and the Q component 402 of the complex signal to extract only the SART signal. , SART complex signal as an I component 403 and a Q component 404.

Further, the I component 403 of the SART complex signal
And the Q component 404 are subjected to inverse Fourier transform by the IFFT unit 33 and returned to the time domain, where the I component 405 and the Q component 406 of the SART complex signal (time) are obtained. Then, after the I component 405 and the Q component 406 are powered by the power conversion unit 34, the SART real number signal 1
06.

Here, the power conversion section 34 calculates the SART real number signal 106 by P = I ² + Q ² , and sets P as the SART real number signal 106.

The SART real number signal 106 is a display signal 10 that can be output to the display 5 by the image display unit 4 in FIG.
7, for example, as shown in FIG.

As described above, in the present embodiment, the SAR transmitting / receiving unit 1 transmits the transmission wave 103 for irradiating an external target such as the ground surface, receives the reflected wave 104 from the target, and After subjecting the reflected wave 104 to signal processing as reception complex data, the I component 101 and the Q component 102 of the reception complex data are output, and SA
The SAR processing unit 2 applies the I component 101 and the Q component 102 of the complex data received from the R transmitting / receiving unit 1 to the respective signals.
SAR processing is performed to output the SAR image real number signal 105, and the I component 101 and the Q component 10
SAR by the SART processing unit 3 from each signal of
A T signal extraction process is performed, a SART real number signal 106 is output, and the SAR image real number signal 105 and the SART real number signal 1 are output.
After receiving “06”, the image display unit 4 converts each signal into a display signal 107 in a format that can be displayed on the display, and causes the display 5 to display it.

Therefore, a transmission pattern with a SART reception window opened is generated in the chirp wave generation unit 13b of the SAR transmission / reception unit 1, and the SART
Since the SART can be received and processed by the processing unit 3, it is possible to reliably receive and display the SART (search and rescue radar transponder) signal without requiring a significant change in the SAR (synthetic aperture radar). it can.

In this embodiment, chirp waves near the transmission center frequency are not transmitted in FIG. 4B, but the location may be another location in the transmission band. Also, in the present embodiment, the SAR
In order to find T, the output signal of the SAR transmission / reception unit 1 is directly supplied to the SART processing unit 3.
The output signal of the transmission / reception unit 1 may be temporarily recorded in a data recording device or the like, and the recorded data may be used to display a SART (search and rescue radar transponder) signal.

[0050]

As described above, according to the signal receiving / processing apparatus and the signal receiving / processing method of the radar transponder for search and rescue according to the present invention, the SAR transmitting / receiving unit irradiates an external target such as the ground surface. After transmitting the transmission wave, receiving the reflected wave from the target, and performing signal processing for the received reflected wave as reception complex data, outputting the I component and the Q component of the reception complex data,
The SAR processing unit performs SAR processing on each signal of the I component and the Q component of the received complex data from the R transmission / reception unit, outputs a SAR image real number signal, and outputs each of the I component and the Q component of the received complex data. A SART signal extraction process is performed from the signal by a SART processing unit, a SART real number signal is output, and after a SAR image real number signal and a SART real number signal are received, a display signal of a format that can be displayed on the respective signals by an image display unit. And a display pattern is displayed on the display. In the chirp wave generation unit of the SAR transmission / reception unit, a transmission pattern with a SART reception window opened is generated. Since reception and processing become possible, the SAR (Synthetic Aperture Radar) can be RT can be reliably receiving and display (search and rescue radar transponder) signals.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a signal receiving and processing device of a search and rescue radar transponder of the present invention.

FIG. 2 is a block diagram illustrating details of an SAR transmission / reception unit of FIG. 1;

FIG. 3 is a block diagram illustrating details of a SART processing unit in FIG. 1;

FIG. 4 is a diagram for explaining the operation of the signal receiving / processing device of the search and rescue radar transponder of FIG. 1 in comparison with a conventional device;

FIG. 5 is a diagram for explaining the operation of the SART processing unit in FIGS. 1 and 3;

FIG. 6 is a diagram showing a display example of the display of FIG. 1;

FIG. 7 is a diagram for explaining a conventional search method in the field of sea accident search.

FIG. 8 is a diagram for explaining an operation of a conventional SART (search and rescue radar transponder).

FIG. 9 is a diagram for explaining the operation of a conventional SART (search and rescue radar transponder).

FIG. 10 is a diagram for explaining the operation of a conventional search radar.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 SAR transmission / reception part 2 SAR processing part 3 SART processing part 4 Image display part 5 Display 11 Antenna part 12 Transmission / reception switching part 13 Transmitter 13a Transmission part 13b Chirp wave generation part 14 Synchronization signal generation part 15 Mixer 16 Delay part 17 LPF 18 A / D conversion unit 19 Mixer 20 LPF 21 A / D conversion unit 31 FFT unit 32 Filter unit 33 IFFT unit 34 Power conversion unit 101 I component of received complex data 102 Q component of received complex data 103 Transmitted wave 104 Reflected wave 105 SAR image Real number signal 106 SART real number signal 107 Display signal 201 Synchronization signal 207 Mixing signal 208 Signal component 209 Delay signal 210 Mixing signal 211 Signal component 212 Pulse repetition frequency (PRF) 301 Chirp wave 401 Frequency domain complex signal Q components of the I component 406 a complex signal of Q component 405 complex signal I component 404 a complex signal of Q component 403 complex signal components 402 frequency domain complex signal

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G01S 13/90

Claims (6)

[Claims] 1. A signal processing for transmitting a transmission wave for irradiating an external target such as the ground surface, receiving a reflected wave from the target, and converting the received reflected wave into reception complex data. After the addition, the SAR transmitting and receiving unit that outputs the I component and the Q component of the received complex data, and performs the SAR process on each signal of the I component and the Q component of the received complex data from the SAR transmitting and receiving unit, A SAR processing unit that outputs a SAR image real number signal; a SART processing unit that performs a SART signal extraction process from each of the I component and Q component signals of the received complex data and outputs a SART real number signal; After receiving the real number signal and the SART real number signal, each signal is converted into a display signal in a format that can be displayed on the display and displayed on the display. A signal receiving and processing device for a search and rescue radar transponder, comprising: an image display unit. 2. The SAR transmission / reception section includes: an antenna section for transmitting the transmission wave and receiving the reflected wave; a transmission / reception switching section for switching transmission / reception of the transmission wave and the reflected wave; and a chirp for generating a chirp wave. A wave generator, a transmitter for transmitting the chirp wave to the antenna unit, a synchronization signal indicating a transmission timing to the transmitter, and a pulse repetition frequency to the transmitter and the chirp wave generator ( A synchronizing signal generation unit for giving a PRF), and a mixing process between the reflected wave and the synchronizing signal.
A first mixer that outputs a first mixing signal; a first LPF that outputs a first signal component obtained by removing a high-frequency component of the first mixing signal; and a digital signal that outputs the first signal component. A first A / D converter that outputs the I component of the received complex data, and a Delay that outputs a delayed signal obtained by delaying the synchronization signal
performing a mixing process of the y part, the reflected wave and the delay signal,
A second mixer that outputs a second mixing signal; a second LPF that outputs a second signal component obtained by removing a high-frequency component of the second mixing signal; and a digital signal that outputs the second signal component. 2. A signal receiving and processing device for a search and rescue radar transponder according to claim 1, further comprising: a second A / D converter that converts the received complex data into a Q component. 3. An SFT processing unit, comprising: an FFT unit that performs a complex Fourier transform on an I component and a Q component of the received complex data and outputs an I component and a Q component of a frequency domain complex signal; A filter unit that performs low-pass filtering on the I and Q components and outputs the I and Q components of the complex signal; and performs a complex inverse Fourier transform on the I and Q components of the complex signal, I that outputs the component and the Q component
2. The signal of the search and rescue radar transponder according to claim 1, further comprising: an FFT unit; and a power conversion unit that converts an I component and a Q component of the complex signal into power and outputs the SART real number signal. 3. Receiving and processing device. 4. An SAR transmission / reception unit for transmitting a transmission wave for irradiating an external target such as the ground surface, receiving a reflected wave from the target, and receiving received complex data for the received reflected wave. A first step of outputting an I component and a Q component of the received complex data, and a signal of the I component and the Q component of the received complex data from the SAR transceiver. SAR processing by the SAR processing unit to output a SAR image real number signal; and SART signal extraction processing by the SART processing unit from the I component and Q component signals of the received complex data. A third step of outputting a real number signal, and after receiving the SAR image real number signal and the SART real number signal, display the respective signals by an image display unit. A fourth step of converting the display signal into a playable display signal and displaying the display signal on a display, wherein the signal reception / processing method of the search / rescue radar transponder signal reception / processing device is provided. 5. The first step includes: a fifth step of transmitting the transmission wave and receiving the reflected wave by an antenna unit; and a transmission / reception switching unit switching between transmission and reception of the transmission wave and the reflected wave. A sixth step, a seventh step of generating a chirp wave by a chirp wave generation unit, an eighth step of sending the chirp wave to the antenna unit by a transmission unit, and the transmission unit by a synchronization signal generation unit , A synchronization signal indicating a transmission timing is given to the transmitting section and the chirp wave generating section.
F) a ninth step of giving a mixing process of the reflected wave and the synchronization signal by a first mixer, and outputting a first mixing signal; and a first LPF, An eleventh step of outputting a first signal component from which the high frequency component of the first mixing signal has been removed; and a first A / D converter for converting the first signal component into a digital signal. A twelfth step of outputting the I component of the received complex data, a thirteenth step of outputting a delay signal obtained by delaying the synchronization signal by a delay unit, and a second mixer, the reflected wave and the delay signal A fourteenth step of performing a mixing process on the second mixing signal and outputting a second signal component by removing a high-frequency component of the second mixing signal by a second LPF. Process and A step of converting the second signal component into a digital signal by a second A / D converter and outputting a Q component of the received complex data. A signal receiving and processing method of the signal receiving and processing device of the search and rescue radar transponder described in the above. 6. The seventeenth step in which, in the second step, an IFT component and a Q component of the received complex data are subjected to a complex Fourier transform by an FFT unit, and an I component and a Q component of a frequency domain complex signal are output. An eighteenth step of performing low-pass filtering on the I component and the Q component of the complex signal in the frequency domain by a filter unit and outputting the I component and the Q component of the complex signal; A nineteenth step of performing a complex inverse Fourier transform on the component and the Q component, and outputting an I component and a Q component of the complex signal; and a power conversion unit performing power conversion of the I component and the Q component of the complex signal, A second output of the SART real number signal
5. The signal receiving / processing method of the signal receiving / processing apparatus of the search and rescue radar transponder according to claim 4, further comprising the step of: