JP5019598B2 - Reception processing device - Google Patents

Description

  The present invention relates to a reception processing apparatus that is used in, for example, a primary radar apparatus for air traffic control and processes a reception signal received by an antenna apparatus.

The aerial device provided in the primary radar for air traffic control has two beams (high beam and low beam), and is received by a high signal received by a high beam formed at a high elevation angle and a low beam formed by a low elevation angle. Output a low signal. In addition, in order to suppress the reflected waves from rain and snow and make it easy to see only the reflected signals from the aircraft, the linearly polarized waves are switched to circularly polarized waves in the rain, and the reflected waves from rain and snow are switched from low signals. And the separated signal is output as a weather signal (see, for example, Non-Patent Document 1).
Revision Radar Technology, The Institute of Electronics, Information and Communication Engineers

  However, conventionally, the received signal is distributed in the state of an analog signal, or switching is performed using an analog switch, which causes a signal power loss or failure.

  The present invention has been made paying attention to the above circumstances, and an object of the present invention is to provide a reception processing apparatus that improves reliability by reducing loss of received signals and reducing parts.

  In order to achieve the above object, a reception processing apparatus according to the present invention forms a high beam and a low beam, is used in a radar apparatus that receives a target signal by switching between linear polarization and circular polarization, and is received by a high beam. An antenna device that outputs a high signal, a low signal received by a low beam, and a weather signal that is separated from the low signal when circularly polarized light is used, and digitally outputs each of the output high signal, low signal, and weather signal. A conversion circuit for converting into a signal, a distribution circuit for distributing the digitally converted low signal, and switching between the digitally converted high signal and the digitally converted low signal distributed by the distribution circuit A high / low switching circuit for outputting a signal, the digitally converted weather signal, and the digital signal distributed by the distribution circuit; A weather / low switching circuit for switching one of the generated low signals to output one of the signals, and a high / low signal processing circuit for performing signal processing on a high signal or a low signal output by the high / low switching circuit And a weather / low signal processing circuit for performing signal processing on the weather signal or the low signal output by the weather / low switching circuit.

  In the reception processing apparatus having the above configuration, the high signal, the low signal, and the weather signal output from the antenna apparatus are respectively converted into digital signals in parallel. Although the low signal is distributed after the digital conversion, it can be distributed without losing the power of the signal due to the distribution on the digital processing. The low signal after distribution is input to the high / low switching circuit and the weather / low switching circuit, respectively. However, since it is a digital process, it is not necessary to use a component that deteriorates depending on the usage time, and performs stable operation. It is possible.

  Therefore, according to the present invention, it is possible to provide a reception processing apparatus that improves the reliability by reducing the loss of received signals and reducing the number of components.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a configuration diagram showing an embodiment of a radar apparatus using a reception processing apparatus according to the present invention.
The radar apparatus includes an antenna apparatus 1 that outputs three signals of high (HIGH), low (LOW), and weather (WX), frequency conversion circuits 21, 22, and 23, and AD circuits 31, 32, and 33. Distribution circuit 4, high / low switching circuit 51, weather / low switching circuit 52, high / low switching control circuit 61, weather / low switching control circuit 62, high / low signal processing circuit 71, weather / Low signal processing circuit 72.

  The high signal, the low signal, and the weather signal output from the antenna apparatus 1 are input to the frequency conversion circuits 21, 22, and 23, respectively, and converted from the RF frequency to the IF frequency. The high signal, the low signal, and the weather signal are converted into IF signals, and then converted into digital signals by the AD circuits 31, 32, and 33, respectively. After digital conversion, the low signal is distributed by the distribution circuit 4 and input to the high / low switching circuit 51 and the weather / low switching circuit 52, respectively.

  The high signal is input to the high / low switching circuit 51, and the weather signal is input to the weather / low switching circuit 52. The high / low switching circuit 51 selects and outputs either a high signal or a low signal in accordance with a control signal from the high / low switching control circuit 61. The weather / low switching circuit 52 selects and outputs either the weather signal or the low signal in accordance with the control signal from the weather / low switching control circuit 62. The output signal of the high / low switching circuit 51 is detected and processed by the high / low signal processing circuit 71. Further, the weather / low signal processing circuit 72 detects the output signal of the weather / low switching circuit 52.

FIG. 2 shows an example of the configuration of a conventional reception processing apparatus.
The low signal output from the antenna device 210 is distributed by the distribution circuit 220 as an analog signal and is input to the high / low switching circuit 231 and the weather / low switching circuit 232. The high signal is input to the high / low switching circuit 231 and the weather signal is input to the weather / low switching circuit 232.

  The high / low switching circuit 231 selects and outputs either a high signal or a low signal in accordance with a control signal from the high / low switching control circuit 241. The weather / low switching circuit 232 selects and outputs either the weather signal or the low signal in accordance with the control signal from the weather / low switching control circuit 242. The output signals of the high / low switching circuit 231 and the weather / low switching circuit 232 are respectively input to the frequency conversion circuits 251 and 252 and converted from the RF frequency to the IF frequency. Thereafter, after digital conversion by the AD circuits 261 and 262, respectively, the high / low signal processing circuit 271 and the weather / low signal processing circuit 272 perform detection processing.

  Here, in the above reception processing apparatus, since the low signal is distributed by the distribution circuit 220 before digital conversion, only the low signal is lost as compared with the high signal and the weather signal. In addition, since the high / low switching circuit 231 and the weather / low switching circuit 232 are switched using switches, parts that cause failure are used.

  On the other hand, in the above embodiment, the high signal, low signal, and weather signal output from the antenna device 1 are converted into digital signals via the frequency conversion circuits 21, 22, 23 and the AD circuits 31, 32, 33 in parallel. Each is converted. Although the low signal is distributed after the digital conversion, it can be distributed without losing the signal power due to the distribution on the digital processing. The low signal after distribution is input to the high / low switching circuit 51 and the weather / low switching circuit 52, respectively. However, since it is a digital process, it is not necessary to use a component that deteriorates depending on the usage time, and the operation is stable. Can be done.

  Therefore, according to the above embodiment, it is possible to improve the reliability by reducing the loss of the received signal and reducing the number of parts.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The block diagram which shows one Embodiment of the reception processing apparatus which concerns on this invention. The figure which shows an example of a structure of the conventional reception processing apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Antenna apparatus, 21, 22, 23 ... Frequency converter, 31, 32, 33 ... AD circuit, 4 ... Distribution circuit, 51 ... High / low switching circuit, 52 ... Weather / low switching circuit, 61 ... High / low Switching control circuit, 62 ... weather / low switching control circuit, 71 ... high / low signal processing circuit, 72 ... weather / low signal processing circuit.

Claims (1)

Used in radar equipment that forms a high beam and a low beam and receives a target signal by switching between linearly polarized waves and circularly polarized waves,
An antenna device that outputs a high signal received by a high beam, a low signal received by a low beam, and a weather signal separated from the low signal when using circularly polarized waves,
A conversion circuit for converting each of the output high signal, low signal, and weather signal into a digital signal;
A distribution circuit for distributing the digitally converted low signal;
A high / low switching circuit that switches between the digitally converted high signal and the digitally converted low signal distributed by the distribution circuit and outputs any one of the signals;
A weather / low switching circuit that switches between the digitally converted weather signal and the digitally converted low signal distributed by the distribution circuit and outputs either signal;
A high / low signal processing circuit for performing signal processing on a high signal or a low signal output by the high / low switching circuit;
A reception processing apparatus comprising: a weather / low signal processing circuit that performs signal processing on a weather signal or a low signal output by the weather / low switching circuit.

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