JPS5916227B2 - radar signal processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION When the output signal of a radar receiver is processed by an electronic computer, the optimal threshold level for radar signal processing is determined and signal detection is performed.

The above-mentioned optimum level was determined by probabilistic calculation in which the probability that the noise component in the output signal exceeds the threshold level, that is, the false alarm probability, was set to a constant value.

By the way, setting the false alarm probability using conventional probabilistic calculations is as follows:
It is assumed to be in the pure noise domain, and noise due to weather phenomena and external interference is not taken into account.

However, in actual usage conditions of radar receivers, that is, in field conditions, they are often affected by noise, especially due to weather phenomena, and in this case, setting the false alarm probability by probabilistic calculations as described above is of no use.

Therefore, it is possible to automatically calculate the optimal threshold level using an electronic computer according to the field conditions, but the memory in the computer is limited and the amount of input data before calculation processing must be within a certain number of memories. You must do so.

The present invention has been made in view of the above circumstances, and is a radar signal processing system capable of automatically determining, using an electronic computer, the optimal value of the threshold level that gives the alarm probability in radar signal processing in any field state. It provides equipment.

An embodiment of the present invention will be described in detail below with reference to the drawings.

- In the figure, 11 is a radar receiver (not shown).

) is provided with a threshold level that determines the alarm probability of a noise component introduced into the radar signal detection circuit, and detects an input signal based on this level.

The threshold setting circuit 12 provides a threshold level setting signal to the radar signal detection circuit 11 in accordance with the output of a determination circuit 14 in an electronic computer 13, which will be described later.

A storage circuit 15 within the electronic computer 13 stores input data from the radar signal detection circuit 11.

Further, an arithmetic circuit 16 in the electronic computer 13 counts the number of input data in the storage circuit 15.

Then, the determination circuit 14 determines whether the calculation result of the calculation circuit 16 is within the memory capacity of the storage circuit 15.

If the determination result is, for example, the calculation result=memory capacity, the command output to the threshold setting circuit 12 is held as is.

On the other hand, if the judgment result is the calculation result>memory capacity, a command is sent to the threshold setting circuit 12 to set the threshold level high, and the amount of output data of the radar signal detection circuit 11 is reduced. do.

Conversely, if the judgment result is that the memory capacity is less than the calculation result, a command is issued to the threshold setting circuit 12 to set the threshold low, and the amount of output data of the radar signal detection circuit 11 is increased.

Thereby, it is possible to always automatically set the optimal threshold level for signal processing for the electronic computer 13.

Note that the judgment output of the judgment circuit 14 is also led to the display 11, where the judgment output can be visually observed and it is possible to constantly monitor whether the signal-processed threshold level is optimal.

In this case, the display 17 determines whether the determination output of the determination circuit 14 is in the "optimal" state, the "suboptimal" state, or the "inappropriate" state of the threshold level, and It would be convenient if the judgment results were displayed.

Note that the memory circuit 15 in the electronic computer 13 is an external memory circuit,
For example, it is also possible to replace it with a magnetic tape device or the like.

As described above, the present invention can provide a radar signal processing device that can automatically determine, using an electronic computer, the optimal value of a threshold level that provides a false alarm probability in radar signal processing under any field condition.

[Brief explanation of the drawing]

The drawing is a block diagram showing an example of a radar signal processing device according to the present invention. 11... Radar signal detection circuit, 12...
-Threshold setting circuit, 13...Electronic computer.

Claims (1)

[Claims] 1 A radar signal detection circuit that detects the radar reception signal output based on a predetermined threshold level, and a radar signal detection circuit that stores the detection power of this circuit and counts the detection output data of the circuit to obtain the Memo, electronic calculation to compare and judge the capacity and 1. A threshold setting circuit is provided for setting a threshold level of the detection circuit so that the relationship between the number of detected output data and the memory capacity is constant based on the determination result of the electronic computer. A radar signal processing device characterized by: