JP5634183B2 - Precision approach radar and radar signal processing method - Google Patents

Description

  Embodiments described herein relate generally to a precision approaching radar and a radar signal processing method.

  Electronic scanning precision approach radar (PAR) performs tracking beam control for a plurality of targets specified for tracking while searching for targets in the coverage area within a certain period of time. The tracking target detection process is performed with high accuracy, and the tracking target symbol is displayed and updated together with the search target on the radar display unit.

  In tracking designation, an operator manually designates a search target symbol displayed on the radar display unit, or a secondary surveillance radar (SSR: Secondary Surveilance Radar) such as ASR (Airport Surveilance Radar) or SIF (Selective Identification Feature). When the control target aircraft detected in (1) enters the PAR coverage area and a correlation with the PAR search target is obtained in the data processing unit, a target tracking instruction command is sent to the target processing unit.

The Institute of Electronics, Information and Communication Engineers, “Revised Radar Technology”, first edition, October 1, 1996, p. 224-225

  The PAR device is a radar system for guiding an aircraft to land on a runway. Sudden changes in the weather environment, such as downburst during landing, can cause serious accidents. However, the normal PAR device as described above detects only the aircraft and displays it on the radar display unit. The raindrop reflection signal including weather information such as downburst is suppressed as an unnecessary signal and displayed on the radar. There is a problem that it is not displayed in the part.

  An object of the present embodiment is to provide a precise approach radar and a radar signal processing method that provide weather information around a descending road and improve safety in landing guidance.

  The precision approaching radar according to the present embodiment transmits a radar wave from an antenna apparatus, receives and transmits the reflected wave, detects an aircraft target based on the received signal of the reflected wave, and outputs target data. Based on the radar video data, target detection means for detecting weather targets based on the received signals, weather detecting means for outputting weather data, video creation means for creating radar video data from the received signals, Display means for displaying a radar video and superimposing and displaying a symbol based on the target data and weather information based on the weather data.

  The radar signal processing method according to the present embodiment is a method of transmitting a radar wave from an antenna device and processing a received signal of the reflected wave, detecting an aircraft target based on the received signal, and obtaining target data. Output, detect weather target based on the received signal, output weather data, create radar video data from the received signal, display radar video based on the radar video data, The base symbol and the weather information based on the weather data are displayed in a superimposed manner.

The figure which shows the structure of the precise measurement approach radar which concerns on this embodiment. The figure which shows the example of a screen display of a radar display part.

  Hereinafter, a precise approach radar and a radar signal processing method according to the present embodiment will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a configuration of a precision approaching radar according to the present embodiment. The precision approaching radar includes an electronic scanning antenna 1, a radar transceiver 2, a target processing unit 3, a data processing unit 4, a radar display unit 5, an input unit 6, and a weather detection processing unit 7.

  A transmission wave generated by the radar transceiver 2 is radiated to the space via the electronic scanning antenna 1. A reflected wave from a target such as an aircraft is received by the radar transceiver 2 via the electronic scanning antenna 1.

  The target processing unit 3 includes a radar signal processing unit 31, a video creation unit 32, a target detection unit 33, and a beam control unit 34.

  The radar signal processing unit 31 divides the received signal from the radar transceiver 2 into two branches, supplies one to the weather detection processing unit 7, and outputs unnecessary signals such as ground clutter, weather clutter, and interference waves to the other. After the suppression, the data is supplied to the video creation unit 32 and the target detection unit 33.

  The video creation unit 32 generates radar video data from the signal output from the radar signal processing unit 31 and inputs it to the radar display unit 5.

  The target detection unit 33 performs target detection processing based on the signal output from the radar signal processing unit 31, and generates an upper limit number of target data that is determined in advance according to device specifications, among the detected targets. The data is output to the data processing unit 4.

  The beam control unit 34 performs scanning control of the electronic scanning antenna 1 in accordance with a tracking instruction from the target detection unit 33 and an operation mode selection instruction to be described later. The tracking instruction is automatically issued when the operator designates the target specified by manually operating the input unit 6 on the radar display unit 5 or when the control target machine enters the PAR coverage area. The processing unit 4 sends a target tracking instruction command to the target processing unit 3.

  On the other hand, the weather detection processing unit 7 suppresses unnecessary signals such as ground clutter and interference waves with respect to the received signal from the radar transceiver 2 and obtains rain region and rainfall intensity information from the signal intensity of the raindrop reflection signal. The weather detection processing unit 7 analyzes the Doppler velocity component and detects the wind direction, the wind speed, and the occurrence state of wind shear. These weather information is transmitted to the radar display unit 5 (or weather terminal) as weather data.

  Target data searched by a secondary surveillance radar (SSR: Secondary Surveilance Radar) such as ASR (Airport Surveilance Radar) and SIF (Selective Identification Feature) is input to the data processing unit 4. The data processing unit 4 performs correlation processing for associating the PAR target data from the target detection unit 33 with the ASR / SIF (SSR) target data, and identifies the aircraft to be controlled.

  In addition, an operation mode selection instruction designated by the operator using the input unit 6 in the radar display unit 5 is input to the data processing unit 4. It is difficult to obtain information on wind direction and wind speed that does not involve rainfall in a normal PAR operation suitable for target detection. Therefore, the target processing unit 3 prepares parameters such as a beam scanning schedule, a pulse width, and a pulse repetition frequency suitable for weather observation as an operation mode for weather observation. For example, the pulse width is increased or the pulse repetition frequency is increased. When an operation mode for weather observation is selected on the radar display unit 5 by an operator's operation, the target processing unit 3 performs a weather detection process within a predetermined time and then returns to the normal operation mode. Adding such a function is effective for obtaining weather information before the controlled aircraft enters the PAR coverage area.

  The radar display unit 5 displays the radar video based on the video data created by the video creation unit 32, and displays the target as a symbol based on the PAR target data after the correlation processing. Further, the radar display unit 5 displays weather information together with aircraft information based on weather data transmitted from the weather detection processing unit 7.

  FIG. 2 shows a screen display example of the radar display unit 5. In FIG. 2, as aircraft information, symbols are superimposed on the radar video so that 21 indicates symbols and videos, and 22 indicates only videos. Furthermore, rainfall information (Precipitation), wind direction (Wind direction), and wind velocity (Wind velocity) are displayed as meteorological information. If wind shear that is dangerous to airplane operation is detected, the shaded area As shown, the wind shear generation range is superimposed on the aircraft information.

  In normal PAR, since only the aircraft is detected and displayed on the radar display unit, the raindrop reflection signal or the like is suppressed as an unnecessary signal and is not displayed on the radar display unit. In the present embodiment, the radar reception signal is branched from the target processing unit 3 to perform weather detection processing, and based on the obtained weather data, the wind and rain situation around the descending road and the occurrence state of wind shear along with the aircraft information are radar detected. It is displayed on the display unit and contributes to the safe landing guidance of the aircraft.

  Since it is difficult to obtain wind direction and wind speed information without rainfall in normal PAR operation, parameters such as beam scanning schedule, pulse width, and pulse repetition frequency suitable for weather observation are set as PAR operation modes. When this operation mode is selected by an operator's operation, a function for returning to the normal operation mode after performing weather detection processing within a predetermined time is added. Such a function is effective in obtaining weather information before the controlled aircraft enters the PAR coverage area. In addition, since it automatically returns to the target detection operation mode after a predetermined time from the operation mode for weather observation, the operator can concentrate on the original control work without bothering the operator.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Electronic scanning aerial line, 2 ... Radar transmitter / receiver, 3 ... Target processing part, 4 ... Data processing part, 5 ... Radar display part, 6 ... Input part, 7 ... Weather detection processing part, 31 ... Radar signal processing part, 32 ... Video creation unit, 33 ... Target detection unit, 34 ... Beam control unit.

Claims (2)

A transmission / reception means for transmitting a radar wave from the antenna device and receiving the reflected wave;
Target detection means for detecting an aircraft target based on the received signal of the reflected wave and outputting target data;
Weather detection means for detecting a weather target based on the received signal and outputting weather data;
Video creation means for creating radar video data from the received signal;
Display means for displaying a radar video based on the radar video data, and superimposing and displaying a symbol based on the target data and weather information based on the weather data;
And characterized by comprising the antenna device, after operating a predetermined time, the operation mode suitable for the detection of weather targets, and control means for controlling to operate in the operation mode suitable for the detection of the aircraft target precision approach radar you. A method of transmitting a radar wave from an antenna device and processing a received signal of the reflected wave,
Detect aircraft target based on the received signal, output target data,
Detect weather target based on the received signal, output weather data,
Create radar video data from the received signal,
Displaying radar video based on the radar video data, superimposing a symbol based on the target data and weather information based on the weather data;
The antenna device, the weather after operating a predetermined time, the target operating mode for detection of the aircraft target feature and, Relais over da to be controlled to operate in the operating mode suitable for the detection of Signal processing method.

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