JPH02275380A - Radar system - Google Patents

Abstract

PURPOSE:To enable execution of optimum beam monitoring for detection and tracking of high performance by applying an adaptive processing to reception signals, by producing a map of coefficients calculated in the course of said processing and by using map informations. CONSTITUTION:Reception signals are inputted to an adaptive signal processing unit 5 through the prior signal processing unit 4. When passing input signals through a filter of an adaptive signal processing filter element 7, the processing unit 5 calculates also filter coefficients in an adaptive signal processing coefficient calculating means 6 and sets the same. Subsequently, informations required for beam monitoring are extracted through the posterior signal processing unit 9 and a data processing unit 10. On the other side, the filter coefficients calculated in succession are accumulated in a coefficient map producing unit 8. Based on these informations, a beam management unit 11 conducts optimum beam disposition and energy allocation for executing all-space search and multi- target tracking in a high-speed response time. The phase of an antenna module is computed by a phase amount computer 12 and beam scanning is conducted at an arbitrary angle. By this constitution, optimum beam monitoring can be executed.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to a radar that electronically fixes the entire beam at any angle from an array antenna VC, such as a search and tracking radar system using an active phased array antenna mounted on a cage ship. It is related to.

[Conventional technology]

FIG. 2 is a configuration diagram of a search and tracking radar system using a conventional array antenna. In the figure, (1) is a transmitter that generates a transmission signal, (2) is an antenna that emits the transmission signal generated by the transmitter and receives the reflected wave from the target, and (3) is a signal that is received by the antenna. A receiver that receives a signal, α3 is a fixed signal processing unit that performs signal processing with fixed processing coefficients on the signal from the receiver, and αG is a signal processor that performs target detection and tracking based on the output result of the fixed signal processing unit. uuH A beam management unit that monitors the Eli beam scanning based on the processing results of the data processing unit; OH The beam management unit calculates the phase amount of the antenna module and calculates the ia This is a phase amount calculator that outputs to the 1ITJ antenna.

In a conventional search and tracking radar system using an array antenna, beam scanning is monitored only using information obtained by performing data processing on signal processing results with fixed processing coefficients.

[Problem to be solved by the invention]

Search and tracking radars are faced with the challenge of full-space search and multi-target tracking, and it is also necessary to improve the response time from detection to tracking. To this end, it is necessary to take full advantage of the features of the array antenna, which allows beams to be fixed at any angle, to achieve optimal beam placement and energy distribution.

This invention was made to solve all of these problems, and aims to optimize beam placement and energy distribution for high-performance detection and tracking.

[Means for solving the problem/)]

The radar system according to the present invention is provided with means for extracting the time required for beam scanning by performing all adaptive signal processing and generating a map of n coefficients calculated in the process.

[Effect]

In this invention, adaptive signal processing is performed on the received signal, a map of the coefficients calculated in the process is generated, and all the map information is utilized.

Optimal beam monitoring for high-performance detection and tracking can be performed.

[Disaster example]

FIG. 1 shows the overall structure of an embodiment of the present invention. In this figure, (11 is a transmitter, (2) is an antenna, (3) is a receiver, (41 is a pre-stage signal processing unit that performs signal processing on the signal received by the receiver in (3), and f
51ri an adaptive signal processing section that performs adaptive signal processing on the processing result of the preceding stage signal processing section in (4), (61 is the above (
Of the adaptive signal processing unit in 5), an adaptive signal processing coefficient calculation unit that calculates a coefficient; (7) is an adaptive signal processing filter unit that configures a filter ft in the adaptive signal processing unit in (5);
(8) is a coefficient map generation unit that uses the coefficients calculated by the adaptive signal processing coefficient calculation unit in (6) as map values in a multidimensional space, and (9) is the processing result of the adaptive signal processing unit in (5). αG is a data processing unit that performs data processing on the processing result of the downstream signal processing unit in (9), and α'' is the coefficient map generation unit of +81 and @note. A beam management unit 112 monitors the beam based on the information of the data processing unit of aυ;
This is a phase amount calculator that calculates the phase amount of the antenna module using the output signal of the beam management section of 1B.

Next, the operation of this device will be explained. A transmission signal generated by the transmitter (1) is radiated from the antenna (2).

The reflected wave from the target is received by an antenna (2) and input to a receiver (3). The received signal is first subjected to signal processing in the @ stage signal processing section (41) and then input to the adaptive signal processing section (51).The adaptive signal processing section (5) passes the input signal to the adaptive signal processing filter section (7). It passes through the filter.

At this time, the filter coefficients are also calculated from the input signal by the adaptive signal processing coefficient calculating section (6) and set adaptively. The processing result of the adaptive signal processing section (5) is processed by the subsequent signal processing section (9).
), the signal is input to the data processing unit αG,
Information necessary for beam monitoring is extracted.

On the other hand, the filter se that is sequentially calculated in the adaptive signal processing coefficient calculation unit (5) from the processed data of the preceding stage signal processing 5 (4) is converted into a multidimensional space (Z) ff peak value f ( X1t "2m"'e x
n ) (ne number of dimensions). An example of this is shown in FIG. In this figure, αQJ,
Map value f of three-dimensional space (XLI X2t xS)
(Xtit X2Jsx5k) is shown. The filter coefficients calculated by the adaptive signal processing coefficient calculation unit (6) are parameters that indicate properties such as clutter, so the map generated by the coefficient map generation unit (8) shows the surrounding environment of the radar and is a parameter that indicates the characteristics of clutter. This information is important for detection and tracking. with this information.

Based on the information from the data processing section aα, the beam management section αB performs beam supervision a for performing all-space search and multi-target tracking with a fast response time, and performs optimal beam placement and energy allocation. Based on the results, the phase amount calculator α2 calculates the phase amount of the antenna module,
Have a beam set meal at any angle.

〔Effect of the invention〕

As explained above in this invention, by performing adaptive signal processing on the received signal and generating a map of filter coefficients calculated in the process.

EJ functions enable optimal beam monitoring for high-performance detection and tracking by understanding the surrounding environment of the radar.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a search and tracking radar system according to the present invention, FIG. 2 is an overall configuration diagram of a conventional search and tracking radar system, and FIG. 3 is a conceptual diagram of an adaptive signal processing filter coefficient map. In the figure, (1) is the transmitter, (2) is the antenna, and (3
) is the receiver, (4) is the pre-stage signal processing section, (5) is the adaptive signal processing section, C61 is the adaptive signal processing coefficient calculation section, (7) is the adaptive signal processing filter section, and (8) is the coefficient map generation section. ,
(9) Post-stage signal processing @, a1 data processing section, fi
11 is a beam management section, and 13 is a phase amount calculator. Note that the same symbols in each figure represent the same or corresponding partials.

Claims (1)

[Claims] A search and tracking radar system using an array antenna includes a transmitter that generates a transmitted signal, an antenna that emits the transmitted signal from the transmitter and receives reflected waves from a target, and a received signal from the antenna. an adaptive signal in a receiving receiver, a front-wave signal processing unit that performs signal processing on the signal from the receiver, and an adaptive signal processing unit that calculates coefficients for adaptive signal processing from the processing results of the front-stage signal processing unit; a processing coefficient calculating section; an adaptive signal processing filter section in the adaptive signal processing section that performs adaptive processing on the processing result of the preceding stage signal processing section using the coefficients calculated by the adaptive signal processing coefficient calculating section; a subsequent signal processing section that performs other signal processing on the output of the processing filter section; a coefficient map generation section that converts the calculation result of the adaptive signal processing coefficient calculation section into a multidimensional map; and an output of the subsequent signal processing section. a data processing unit that inputs the results and performs data processing for search and tracking; and a beam management unit that performs optimal beam placement and energy distribution based on the processing results of the data processing unit and map information of the coefficient map generation unit. and a phase amount calculator that calculates the phase amount of the antenna module based on the control signal of the beam management section and outputs the result to the antenna.