JP2015059887A - Pulse compression radar and method of measuring distance of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulse compression radar capable of improving distance measurement accuracy from initial detection.SOLUTION: A pulse compression radar transmits a pulse signal subjected to frequency modulation processing based on a chirp signal factor to a target and performs pulse compression processing to a reflected pulse based on a pulse compression coefficient. The pulse compression radar includes: a model information extraction device for extracting model information from flight plan information of an aircraft; a database in which speed information corresponding to the model information is stored; and a pulse compression coefficient calculator for calculating a pulse compression coefficient from the speed information. The pulse compression coefficient calculator transmits a calculated pulse compression coefficient to a pulse compressor.

Description

  The present invention relates to a pulse compression radar apparatus that performs pulse compression processing.

  The pulse compression radar is used as a radar device that detects a target such as an aircraft. Many precision approach radars (PARs) also use pulse compression processing. The PAR is used to accurately measure the position and speed of the aircraft to be guided at the time of landing guidance of an aircraft, and is usually combined with an airport surveillance radar (ASR) and a secondary surveillance radar (SSR). Are in operation.

When the aircraft lands at the airport, the ASR and SS described above are used until the final entry course.
It has been guided by R and the control right is handed over to PAR in the final approach course.

  However, there is a problem that the target aircraft to be guided to landing have different approach speeds for landing depending on the model and situation, and a ranging error occurs depending on the approach speed.

  In the above technical field, technologies such as Patent Documents 1 and 2 are disclosed.

  Patent Document 1 discloses a technique for stably detecting a landing guidance target aircraft using a filter.

  Patent Document 2 discloses a pulse compression technique for setting an optimal chirp method.

JP2012-168060A Japanese Patent Laid-Open No. 11-194166

  In Patent Documents 1 and 2, a Doppler frequency is generated by the Doppler effect due to the speed of the aircraft, so that the pulse compression result is offset, resulting in a ranging error.

  The objective of this invention is providing the pulse compression radar which solves the subject mentioned above.

  The present invention relates to an aircraft flight plan in a pulse compression radar that transmits a pulse signal subjected to frequency modulation processing based on a chirp signal coefficient toward a target and applies pulse compression processing to a reflected pulse based on a pulse compression coefficient. A model information extractor that extracts model information from the information, a database that stores speed information corresponding to the model information, and a pulse compression coefficient calculator that calculates a pulse compression coefficient from the speed information. The calculator is characterized by sending the calculated pulse compression coefficient to the pulse compressor.

  Further, the present invention provides a pulse compression radar that transmits a pulse signal subjected to frequency modulation processing based on a chirp signal coefficient toward a target, and applies pulse compression processing to the reflected pulse based on a pulse compression coefficient. Extracting model information from the flight plan information; storing speed information corresponding to the model information; calculating a pulse compression coefficient from the speed information; and sending the calculated pulse compression coefficient to the pulse compressor It is characterized by including.

  The effect of this invention is providing the pulse compression radar which can improve the distance measurement precision at the time of first detection.

It is a block diagram which shows the structure of the pulse compression radar in embodiment of this invention. It is the data table which showed the model of the airplane in the embodiment of this invention, and the moving speed at the approach point. It is a flowchart which shows operation | movement of the pulse compression coefficient calculator in embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(Embodiment)
FIG. 1 is a block diagram showing a configuration of a pulse compression radar according to an embodiment of the present invention.

  In FIG. 1, the antenna 1 emits a transmission pulse to the space at the time of transmission, and receives a signal reflected from the target at the time of reception. The transmission / reception switch 2 is connected to the antenna 1 and switches between a transmission signal and a reception signal at the timing of transmission and reception. The chirp signal generator 4 generates a transmission pulse subjected to frequency modulation with a frequency change width necessary for obtaining a required radar performance. The transmitter 3 power-amplifies the transmission pulse generated by the chirp signal generator 4, and then outputs the amplified pulse to the antenna 1 via the transmission / reception switch 2. The receiver 5 performs processing of amplification, frequency conversion, and A / D conversion on a reception signal input from the antenna 1 via the transmission / reception switch 2.

  The pulse compressor 6 performs pulse compression processing on the received signal using the reference signal input from the chirp signal generator 4. The integration processor 7 performs coherent integration processing using a plurality of reception signals corresponding to a plurality of transmission pulses as a set of reception signals. The target detector 8 detects a target signal from the signal after integration output from the integration processor 7 by threshold determination. The distance measurement processor 9 obtains the distance from the difference between the time when the transmission pulse is generated and the detection time of the target signal.

  The model information extractor 10 extracts aircraft model information for starting control from flight plan information input from an external system (not shown). The extracted model information is a pulse compression coefficient calculator 11. Then, it is input to the model / approach speed database 12.

  Next, the operation of the embodiment of the present invention will be described with reference to FIG. 1, FIG. 2, and FIG.

  FIG. 2 is an example of a model / entry speed table given to the model / entry speed database 12. The model name of the aircraft and the approach speed at the approach point are shown.

  FIG. 3 is a flowchart showing an operation flow of the pulse compression coefficient calculator 11.

  The pulse compression coefficient calculator 11 obtains model information from the model information extractor 10 (S101). Then, the obtained model information is output to the model / entry speed database 12 (S102). In the model / approach speed table 12, the corresponding approach speed data is selected from the input model information and output to the pulse compression coefficient calculator 11 (S103).

  For example, in the model / approach speed table as shown in FIG. 2, if the model information is “AA”, the approach speed is 200 km / h.

  The pulse compression coefficient calculator 11 that has obtained the approach speed data calculates an optimum pulse compression coefficient value from the approach speed data (S104) and outputs it to the pulse compressor 6 (S106). The pulse compressor 6 performs a pulse compression process using a given pulse compression coefficient.

  Further, distance information which is an output of the distance measuring processor 9 is input to the pulse compression coefficient calculator 11 (S105). Thereby, the error of distance information can be minimized by continuously calculating the speed of the aircraft, calculating the pulse compression coefficient from the value, and performing the pulse compression processing.

  As described above, when the speed information at the time when the aircraft takes over the control right to the PAR in the final entry course from the guidance by ASR and SSR, the aircraft model name and the entry point of the present invention are used in advance. It is effective to prepare the approach speed and use it as speed information.

  With the above operation, the present invention is effective in improving the ranging accuracy when the control right is handed over to the PAR in the final approach course from the guidance by the ASR and the SSR when the aircraft lands at the airport.

  The present invention is not limited to the above-described embodiment, and can be implemented with various changes and modifications without departing from the gist of the present invention.

  The present invention is applicable to a radar apparatus using a pulse compression method.

DESCRIPTION OF SYMBOLS 1 Antenna 2 Transmission / reception switch 3 Transmitter 4 Chirp signal generator 5 Receiver 6 Pulse compressor 7 Integration processor 8 Target detector 9 Ranging processor 10 Model information extractor 11 Pulse compression coefficient calculator 12 Model / entry speed The database

Claims (4)

In a pulse compression radar that transmits a pulse signal subjected to frequency modulation processing based on a chirp signal coefficient toward a target, and applies pulse compression processing to the reflected pulse based on a pulse compression coefficient,
A model information extractor that extracts model information from aircraft flight plan information;
A database storing speed information corresponding to the model information;
A pulse compression coefficient calculator for calculating a pulse compression coefficient from the speed information;
Have
The pulse compression coefficient calculator is configured to send the calculated pulse compression coefficient to the pulse compressor.   The pulse compression radar according to claim 1, wherein the pulse compression coefficient calculator calculates a pulse compression coefficient from aircraft distance information obtained from an output of the pulse compression radar.   The pulse compression radar according to claim 1 or 2, wherein the model information and approach speed information are described in the database. In a pulse compression radar that transmits a pulse signal subjected to frequency modulation processing based on a chirp signal coefficient toward a target, and applies pulse compression processing to the reflected pulse based on a pulse compression coefficient,
Extracting model information from the flight plan information of the aircraft;
Storing speed information corresponding to the model information;
Calculating a pulse compression coefficient from the speed information;
Sending the calculated pulse compression coefficient to a pulse compressor;
A distance measurement method in a pulse compression radar, comprising:

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