JPH03291587A - Dummy target signal generating device - Google Patents

Abstract

PURPOSE:To generate a dummy target signal after pulse compression processing is simulated by setting pulse modulation timing and pulse width independently and performing phase control in the same pulse in subpulse units. CONSTITUTION:The timing control part 6 of a pulse modulation part 4 sets the pulse modulation timing to for an RF source signal (c) according to a trans mission trigger signal (b) which is time-delayed 2 according to distance delay time data (a). Then the signal (c) is outputted to a pulse width and phase control part 7, the pulse with is set to a time T from the timing t for the signal (c) according to pulse width data (h), subpulse width data (d), and phase data (e), and the pulse is divided by the subpulse width equal to an interval tau. Then phase modulation is imposed on the signal (c) of each subpulse according to the data (e) and the processing result is outputted to an RF control part 5; and distance attenuation processing is performed with distance attenuation data (g) and the dummy target signal (f) is outputted to an external pulse radar device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to pulse modulation processing of a pseudo target signal generator used for system testing of pulse radar equipment.

[Prior Art J] FIG. 4 is a diagram showing an example of a conventional pseudo target signal generating device. In the figure, (1) is a data processing unit that inputs target distance data (A) and processes it to generate distance attenuation data (B) and distance delay time data (X), and (2) is a data processing unit that inputs target distance data (A) and processes it to generate distance attenuation data (B) and distance delay time data (X). For the transmission trigger signal (1),
A time delay control unit that performs time delay processing based on the distance delay time data (pieces) from the data processing unit (1), (3) is R
An RF generation section (4) that generates an F source signal (RI) generates an RF source signal (RI) from the RF generation section (3) based on the transmission trigger signal (1) from the time delay control section (2). On the other hand, the pulse modulation section (5) sets the pulse modulation timing and pulse width and performs pulse modulation processing, and the pulse modulation section (5) receives the data from the pulse modulation section (4) based on the distance attenuation data (a) from the data processing section (1). This is an RF control unit that performs attenuation processing on the input pulse-modulated RF source signal (RI) and outputs a pseudo target signal (X) to an external pulse radar device.

Next, the operation will be explained.

-M, the pulse radar device radiates continuous waves into space with a constant pulse width tw and a constant pulse repetition period Ti in order to detect an aircraft target. FIG. 5 shows the waveform of the transmission wave of the pulse radar device. Assume that there is a target at a distance R from the pulse radar device, and that the pulse radar device receives radar waves that are irradiated with radar waves and reflected nine times. At this time, the distance delay time t6 from when the pulse radar device transmits a radar wave to the target until receiving the reflected wave is given by the following equation. However, C is the speed of light.

t, = 2 R/c - (1) Also, the power P of the received radar wave is given by the following formula, where k is a constant.

P=ni/R' ・−・・・・−・
(2) Figure 6 shows the positional relationship between the pulse radar device (8) and the aircraft target (9), and Figure 7 shows (1)
In order to explain the equation, the temporal relationship between the transmitted wave (C) and the reflected wave (S) of the radar wave of the pulse radar device is shown. In order to perform a system test of a pulse radar device, the pseudo target signal generator generates a pseudo target signal by converting the radar waves transmitted by the pulse radar device under test to a distant target and reflecting the received reflected waves. This is a device that generates

In the conventional pseudo target signal generator, the target distance R is input from an external device to the data processing unit (1) as target distance data (a) in FIG. 4, and the distance delay time t is calculated based on equation (1). and output to the time delay control unit (2) as distance delay time data (x). In addition, in the data processing unit (1), the power P of the radar wave received by the pulse radar device is calculated based on equation (2) for each target distance.
is calculated, and further, an attenuation value A from the maximum output Pm of the pseudo target signal (i) given by the following formula is calculated, and this is output to the RF control unit (5) as distance attenuation data (a).

A=Pm-P・・・・・・・・・-・
(3) The time delay of the received wave with respect to the transmitted radar wave is determined by inputting a transmission trigger signal (1) synchronized with the timing of the radar wave transmitted from the pulse radar device from an external device,
On the other hand, this is done by setting the delay time t based on the distance delay time data (pieces) input from the data processing section (1). The continuous wave is generated as an RF source signal in an RF generator (3) and output to a pulse modulator (4). Here, the RF source signal (RI) is 2
The transmission trigger signal (1) subjected to time delay processing is input to the time delay control section (2), and the timing and pulse width of pulse modulation are set based on this signal, and the output is sent to the RF control section (5). ). Next, the RF control unit (5) sends the distance attenuation data (a) to the data processing unit (1).
), and based on this, attenuation processing is performed on the pulse-modulated RF source signal (RI) input from the pulse modulation section (4), and the result is sent to an external radar device as a pseudo target signal (RI). ) as output. FIG. 7 shows the temporal relationship between the transmission trigger signal (1) and the pseudo target signal (x).

[Problems to be Solved by the Invention] Since the conventional pseudo target signal generator is configured as described above, it is possible to independently set the pulse modulation timing and pulse width in pulse modulation processing for an RF source signal. could not. Therefore, there is no problem if the phase of the RF source signal within the same pulse is uniform like in a normal radar wave, but in the case of a radar wave that has undergone pulse compression processing, the same pulse may be treated as a sub-pulse. It is not possible to divide the RF source signal at certain regular intervals and control the phase of the RF source signal for each sub-pulse, and it is not possible to generate a pseudo target signal that simulates pulse compression processing. For this reason, it was not possible to perform a system test of a pulse radar device that performs pulse compression.

This invention was made to solve the above-mentioned problems, and the R
An object of the present invention is to obtain a pseudo target signal generation device that can perform phase control of an F source signal and generate a pseudo target signal for system testing for a pulse radar device that performs pulse compression.

[Means for Solving the Problems] A pseudo target signal generating device according to the present invention includes a pulse modulation timing control section that controls the timing of pulse modulation with respect to an RF source signal, and a pulse width setting and sub-pulse unit phase. It is divided into a pulse width/phase control section that performs control, and the pulse modulation timing and pulse width are set independently.

This allows phase control to be performed on a sub-pulse basis within the same pulse.

[Operation] Therefore, the pseudo target generation device according to the present invention is capable of generating a pseudo target signal for system testing of a pulse radar device that performs pulse compression.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
In the figure, (1) inputs target distance data (7),
From this, distance attenuation data (a) and distance delay time data (x) are calculated and output, and pulse width data (e), sub-pulse width data (force) and phase data (k) are input from external equipment. The data processing unit (2) that outputs these performs distance delay processing on the transmission trigger signal (1) input from the external device based on the distance delay time data (x) input from the data processing unit (1), A time delay control section outputs this to a pulse modulation/timing control section (6), an RF generation section (3) generates an RF source signal, and a pulse modulation section (4). A timing controller (6) that controls the timing of pulse modulation based on a transmission trigger signal (1) input from a two-hour delay controller (2) to On the other hand, it is composed of a pulse width/phase control section (7) that performs pulse width setting, sub-pulse width setting, and phase control for each sub-pulse. (5) performs distance attenuation processing on the pulse modulated RF source signal (ri) output from the pulse modulation section (4) based on the distance attenuation data (a), and converts it into a pseudo target signal (ke). This is an RF control unit that outputs signals to an external pulse radar device. Above (1) to (3), (
5) (A) ~ (Eng. 1, (Ri. 1) is the same as or equivalent to the conventional one.

Next, the operation of the above embodiment will be explained with reference to FIGS. 1 to 3.

Pulse compression processing of a pulse radar device is performed for the purpose of improving target detection performance. Figure 2 shows the transmitted pulse (co) of a pulse radar device that performs pulse compression. The transmitted pulse (co) with a pulse width T is divided into sub-pulses at regular intervals, and each Based on the phase data (K) corresponding to the sub-pulse, the phase of the carrier wave in the transmission pulse is shifted by 0 or π to perform phase modulation and is transmitted to a target in space.

The pseudo target generation device according to the present invention generates a pseudo target signal for a pulse radar device performing pulse compression processing by the following method.

In FIG. 1, the pulse width, sub-pulse width, and phase data of each sub-pulse in the transmission pulse of the pulse radar device are pulse width data (o).

The sub-pulse width data (force) and phase data (ki) are input from an external device to the data processing unit (1) together with target distance data (7'). The calculation process of the target distance data (a) in the data processing section (1) is the same as in the case of FIG. 4, and the results are output as distance delay time data (x) and distance attenuation data (b). Time delay control section (
In 2), the transmission trigger signal (phantom) subjected to time delay processing based on the distance delay time data (2) is output to the timing control unit (6) provided in the pulse modulation unit (4),
Here, the RF source signal (RI) generated by the RF generator (3) is input, and the timing t0 of pulse modulation is set for this signal based on the transmission trigger signal (1). Next, the RF source signal (RI) is output to the pulse width/phase control unit provided in the pulse modulation unit (4), where the pulse width data (O) and sub-pulse width data input from the data processing unit (1) are output. Based on (force) and phase data (ki),
Timing t with respect to the RF source signal (ri). to time T is set as the pulse width, and the pulse is further divided into sub-pulse widths at intervals. Then R of each sub-pulse
Phase modulation is performed on the F source signal (RI) based on the 1-phase data (K), and the results of these processes are output to the RF control section (5). Next, the RF control unit (5) uses the distance attenuation data (A) input from the data processing unit (1).
Based on this, distance attenuation processing is performed on the signal input from the pulse modulation section (4), and the result is converted into a pseudo target signal (
i) Output to an external pulse radar device.

FIG. 3 shows the transmission trigger signal (1).

RF source signal (ri), pulse width data T, sub-pulse width data with 1 phase data (ki) and pseudo target signal (ke)
This shows the relationship between Note that in the 9-line method, the sub-pulse width data is set equal to the pulse width data and the 9-phase data is set to 0.

A pseudo target signal for system testing can be generated even for a pulse radar device that has not undergone pulse compression processing.

[Effects of the Invention] As described above, according to the present invention, it is possible to generate a pseudo target signal that simulates pulse compression processing in which a transmission pulse is divided into sub-pulses and phase modulation is performed on each sub-pulse.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of transmitted pulses of a pulse radar device performing pulse compression, and FIG. 3 is a diagram showing the time and correlation of signals in each part of the present invention. 4 is a diagram showing a conventional pseudo target signal generator, FIG. 5 is an explanatory diagram of the waveform of a transmitted wave of a radar wave, and FIG. 6 is an explanatory diagram of the distance relationship between the pulse radar device and the target. FIG. 7 is an explanatory diagram of the time relationship between the transmitted wave and the received rake wave, and FIG. 8 is an explanatory diagram of the time relationship between the transmission trigger signal and the pseudo target signal. In the figure, (1) is a data processing section, (2) is a time delay control section, (3) is an RF generation section, and (4) is a pulse modulation section. (5) is an RF control section, and (6) is a timing control section. (7) is a pulse width/phase control unit, (8) is a pulse radar device, (9) is an aircraft target, (a) is target distance data,
(A) is distance attenuation data, (1) is distance delay time data, (2) is the transmission trigger signal, (2) is pulse width data, (
(i) is the sub-pulse width data, (i) is the phase data, (ri) is the RF source signal, (i) is the pseudo target signal, ( ]) is the transmitted wave, and (su) is the received wave. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] a data processing unit that inputs target distance data, calculates it, and outputs distance attenuation data and distance delay time data; an RF generation unit that generates an RF source signal; and an RF generator that inputs a transmission trigger signal from an external device; a time delay control unit that inputs the distance delay time data from the data processing unit, performs distance and time delay processing on the transmission trigger signal, and outputs it; and a pulse of the transmission trigger signal input from the time delay control unit. a pulse modulation section that performs pulse modulation processing on the RF source signal based on the modulation timing and pulse width and outputs a pseudo target signal; and a pulse modulation section that performs pulse modulation processing on the RF source signal and outputs a pseudo target signal, and attenuates the pseudo target signal based on the distance attenuation data input from the data processing section. In a pseudo target signal generation device comprising an RF control unit that performs processing and outputs the pseudo target signal to the outside, an input/output processing function of pulse width data, sub-pulse width data, and phase data is added to the data processing,
and a timing control unit that inputs the transmission trigger signal from the time delay control unit to the pulse modulation unit and sets the timing of pulse modulation with respect to the RF source signal, the pulse width data, the sub-pulse width data, and the phase data. A pulse width/phase control unit is provided which inputs a pulse width, sets a sub-pulse width, and controls the phase of each sub-pulse for the timing-controlled RF source signal, and performs pulse modulation of the RF source signal. 1. A pseudo target signal generating device having a function of generating a pseudo target signal simulating pulse compression processing in which transmission pulses are divided into sub-pulses and phase control is performed on each sub-pulse.