JPH0450682A - Radar apparatus - Google Patents

Abstract

PURPOSE:To confirm that an error is within a predetermined value by providing a comparison circuit comparing and detecting the phase quantity obtained in the 'previous time' used in the correction of the 'present time' and the data of the 'present time' renewing the content of an RAM. CONSTITUTION:A comparison circuit 10 compares the output of a phase detection circuit 6 written in an RAM 7 with the output of a latch circuit 8 to detect the difference between the phase setting data indicated by a controller 4 and the phase at the time of the transmission of an actual RF signal. By confirming that this difference is received within a predetermined range, it can be confirmed whether an error is within a predetermined value by correction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a radar device, and particularly to a radar device having an MT1 function.

[Conventional technology]

FIG. 2 is a block diagram of a conventional separator device.

In the figure, 1 is an amplifier that amplifies the RF multiplied signal, 2 is a phase shifter that sets the phase of the RF multiplied signal input to the amplifier 1, and 3
is a high frequency signal generator that generates an RF multiplied signal, 4- is a controller that controls data to set the phase when transmitting the RF multiplied signal, 5a and 5b are amplifier 10 inputs, and directional coupling to take out the RF multiplied signal from the output. A phase detection circuit 6 detects the transmitted phase of the amplifier 1 as an RF multiplied signal extracted from the directional couplers 5a and 5b; 8 is a latch circuit that holds the phase amount read out from RAM 7 by a certain trigger, and 9 is a phase held by the latch circuit 8. This is a phase setting circuit that calculates the amount and phase setting data from the controller 4 and provides the phase data to the phase shifter 2.

Next, the operation will be explained.

The RF multiplied signal generated by the high frequency signal generator 3 is set to the required phase by the phase shifter 2, amplified by the amplifier 1, and transmitted. The RF multiplied signals are taken out from the directional couplers 5b and inputted to the phase detection circuit 6. The phase detection circuit 6 detects phase fluctuations due to temperature changes in the amplifier 1, phase fluctuations due to frequency changes, and phase fluctuations due to pulse width changes based on the input RF signal of the amplifier 1 sent from the directional coupler 5a. and compares it with the output RF signal of the amplifier 1 to detect the amount of phase variation due to the change. The detected amount of phase variation is stored in the RAM 7 at an address assigned to the signal characteristics such as the frequency and pulse width at that time.

The above series of operations is always performed, and the latest phase variation amount is always stored in the RAM 7. In this way, the amount of phase variation for various RF multiplied signal features is written into the RAM 7.

Next, when the RF signal characteristics change after a certain time,
The amount of phase variation stored with the same feature as an address at that time is read out from the RAM 7 and transmitted to the latch circuit 8, where the data of the amount of phase variation is held. In order to provide the MTI function, the data held in the latch circuit 8 is configured not to change during a specific period, for example, until information that changes the frequency characteristics is input.

The phase setting circuit 9 calculates the transmission RF signal phase setting data from the controller 4 and the data from the latch circuit 8, and provides a phase correction value to the phase shifter 2.

As described above, conventional radar equipment reduces phase fluctuations between RF multiplied signal pulses by detecting and correcting phase fluctuations in the transmission phase of the amplifier, that is, fluctuations due to temperature fluctuations, fluctuations due to frequency changes, and fluctuations due to pulse width changes. I'm letting you do it.

[Problem to be solved by the invention] The conventional radar device is configured as described above, and since the data used for correction was obtained during the "previous" transmission, it is necessary to apply the "current" correction. If the power multiplied RF signals have the same characteristics and therefore the correction is working normally,
The difference between the phase setting data instructed by the controller 4 and the actual phase when transmitting the RF multiplied signal is the difference in phase fluctuation value between the previous and current times, but since there is no function to detect this, correction is required. Therefore, there was a problem in that it was not possible to confirm whether the error was within a predetermined value.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a radar device that can confirm that the error is within a predetermined value by correcting the phase amount.

[Means to solve the problem]

The radar device according to the present invention updates the contents of the RAM by acquiring the phase amount acquired "previously" to be used for "current" correction and for each transmitted pulse to be used for "next" correction. A comparison circuit is provided to compare and detect the "current" data.

[Effect]

In this invention, the phase amount acquired in the "previous" time used for the "current" correction, and the "current amount" acquired corresponding to each transmitted pulse to be used in the "next" correction and updated in the RAM. A comparator circuit is installed to compare and detect the data of ``, and it detects the difference between the actual phase amount of the transmitted RF multiplied signal by correcting the transmission phase of the amplifier and the desired phase amount. If the value is positive, it can be confirmed that the error is within a predetermined value.

〔Example〕

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

FIG. 1 shows a block configuration diagram of a radar device according to an embodiment of the present invention, in which the same symbols as in FIG. 2 indicate the same or corresponding parts, and 10 is a phase detection circuit 6 written in the RAM 7.
This is a comparison circuit that compares the output of the latch circuit 8 with the output of the latch circuit 8.

Next, the operation will be explained.

Since the operations 1 to 9 are the same as those of the conventional radar device shown in FIG. 2, the explanation thereof will be omitted here, and the operation of the comparator circuit 10 will be explained.

This comparison circuit 10 compares the output of the phase detection circuit 6 written in the RAM 7 with the output of the latch circuit 8, thereby determining the phase setting data instructed by the controller 4 and the phase at the time of actual RF multiplied signal transmission. Detect the difference. This difference is “this time”
This is the difference between the phase amount acquired "previously" when the RF multiplied signal with the same characteristics was transmitted and the phase amount "this time", and corresponds to the phase fluctuation due to the change in temperature. By checking whether this difference is within a predetermined range, it is possible to confirm whether the error has been reduced to a predetermined value by correction.

In the above embodiment, the means for confirming the phase correction function of a transmitter having an amplifier that amplifies the RF signal generated by the high-frequency signal generation circuit has been described. It may also be used for phase correction, producing the same effects as the above embodiment.

Furthermore, using the above embodiment, it is possible to configure a radar device that has a protective operation by stopping the transmission function when the phase error increases beyond a predetermined value, or to provide an alarm for disturbances in phase synthesis in space. It is possible to obtain a radar device that has the function of emitting as follows.

〔Effect of the invention〕

As described above, according to the radar device according to the present invention, the phase amount acquired "previously" used for "current" correction and "
A comparator circuit is installed to compare and detect data acquired corresponding to each transmission pulse for use in the next time's correction, and to update the contents of the RAM. Since the difference between the actual phase amount of the signal and the desired phase amount is detected, it is possible to confirm that the error has been suppressed to a predetermined value by correcting the phase amount. A radar device having function confirmation means is obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a radar device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional radar device. 1 is an amplifier, 2 is a phase shifter, 3 is a high frequency signal generator, 4 is a controller, 5 is a directional coupler, 6 is a phase detection circuit, 7 is a random access memory (RAM), 8 is a latch circuit, 9
1 is a phase setting circuit, and 10 is a comparison circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts. Figure 1 'Eft Figure 2

Claims (1)

[Claims] (1) A phase shifter that sets the phase of the RF signal, a controller that controls data for setting the phase of the RF signal, an amplifier that amplifies the phased RF signal, and the input and output RF signals of the amplifier. a directional coupler that takes out the output of the directional coupler; a phase detector that receives the output of the directional coupler as an input and detects the transmitted phase amount of the amplifier; a RAM that stores the output of the phase detector at a predetermined address; In a radar device having a latch circuit that holds the output phase amount, and a phase setting circuit that calculates the output of the latch circuit and the output of the controller and provides a phase fluctuation correction value to the phase shifter, the transmitted phase amount and A radar device characterized by comprising means for comparing the phase fluctuation correction value and detecting whether the error due to the correction is within a predetermined value.