JPH02183187A - Generating method of simulated object signal and apparatus therefor - Google Patents

Abstract

PURPOSE:To generate a signal closer to a signal reflected from an actual object by changing the speed and distance of a simulated object signal in consideration of an acceleration thereof. CONSTITUTION:An acceleration data signal input from an external device, an output terminal of a first phase adjusting unit 12 and an output terminal of the acceleration data signal are connected to a second frequency demultiplier unit 5. A speed data signal and an output terminal of the second frequency demultiplier 5 are connected to a second speed counter unit 6. Moreover, an output terminal of a first speed counter unit 4 and an output terminal of the second speed counter unit 6 are connected to a second phase adjusting unit 7. On the basis of the acceleration from the acceleration data signal and the speed from the first-received speed data signal, a clock signal is generated every corresponding time to the distance resolution in accordance with the speed changing with an acceleration so as to allow a simulated object signal to move in a manner similar to a uniformly accelerated motion before a next speed data signal is received. A delay time is changed every period of this clock signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of changing the speed and distance of a pseudo target in a pseudo target signal generating device, and an apparatus thereof.

[Conventional technology]

FIG. 2 is a diagram showing an example of a conventional pseudo target signal generating device. In the figure, (a), (b), and (c) are signals input from external equipment, which are a transmission signal indicating pulse information of a pseudo target, a speed information signal indicating association, and a side transmitting radio waves, respectively. Distance information signal indicating the distance from to the pseudo target. (1) is a reference signal generation unit that generates a signal that serves as a reference for all signals of the present pseudo target signal generation device. (2) is a first phase adjustment unit that adjusts the signal from the reference signal generation unit (1) to the phase of the transmission signal (A). (3) is a first frequency dividing section for dividing the frequency of the signal from the reference signal generating section (1).

(4) is a first speed counter unit that receives the speed information signal (b) and determines the cycle for changing the distance to the pseudo target in accordance with the speed by distance resolution. (8) C. A range delay part that receives the distance information signal of the pseudo target and determines the distance to the pseudo target. (9) is a storage unit that stores the information of the transmission signal (a) and reads it out again. (10) is an output signal from the first speed counter section (4), and a first smoothing clock signal (12) is a pseudo target signal that is an output signal from the storage section (9).

Next, the operation will be explained using FIG. 3. FIG. 3 shows a state in which the information of the transmission signal (a) is written to the address of the RAM of the storage section (9) along with the 9th hour, and this information is read out. At this time, the RAM of the storage section (9) uses the reference signal from the reference signal generation section (1) whose phase has been matched with the transmission signal (a) in the first phase adjustment section (2) as a clock signal, and then outputs the transmission signal. The information in (b) is being written and read. Therefore, the transmitted signal (a)
The time required for one operation to write and read out the information in the RAM of the storage unit (9) determines the distance resolution of the pseudo target, and this time determines the distance resolution of the pseudo target.
1) is the repetition time of the reference signal from 1). Normally, this repetition time is selected to be sufficiently small compared to the time required for an aircraft, etc., which is the target of the pseudo target, to travel a distance corresponding to the range resolution, so that changes in the distance of the pseudo target can be set finely. It has become. The reference signal from the reference signal generation section (1) is input to the first phase adjustment section (2) and is matched in phase with the transmission signal (a). In order to obtain time for the pseudo target to travel a distance that is half the distance resolution, the frequency of the reference signal from the reference signal generator (1) is first converted to a lower frequency in the first frequency dividing section (3). Then, this converted signal is sent to the first speed counter section (
4), receives the speed information signal (b), and generates a first smoothing clock signal (10) at intervals corresponding to the distance resolution for this speed. This first smoothing clock signal (10) is input to the storage section (9), and this first smoothing clock signal (lO
) into which the information of the transmission signal (a) is written every cycle.
The location of the address has changed. Therefore, the time until the information of the transmission signal (a) inputted on -day is called again changes every cycle of the first smoothing clock signal (lO) from the first speed counter section (4). become. Then, the distance information signal (c) is input to the range delay part (8), a delay time corresponding to this distance is determined, and a calculation is performed to determine how many times the distance resolution this delay time corresponds to. The position of the address corresponding to the multiple is determined, and the information of the transmission signal (a) is written to this address. Therefore, the information of the transmission signal (a) inputted on -day is written from the address position of the RAM of the storage unit (9) corresponding to the distance from the distance information signal (c), and from the speed information signal (b). For each period of the first smoothing black signal (lO) corresponding to the speed and distance resolution of
Since the location of the address to be written is changed,
The delay time of the pseudo target signal (12) can be freely changed with respect to the transmission signal.

Next, a specific example will be provided and explained.

Repetition frequency of reference signal F-25klHz...
・(1) Pseudo target speed V = 2250tab, ecC equivalent to approximately Ma-tsuba 7) - (
2) Distance resolution of pseudo target T = 40nsec (1/25MHz) ・
= (3) The distance lll:R corresponding to the distance resolution is given by the radio wave propagation speed 20 as C=3.0×1G”m/sec.

Therefore, if the time required for the pseudo target to move through the distance resolution is t, then t = = 2666μSec ・−・(5)
25G Therefore, the delay time of the pseudo target is 4 every 2666 μsec.
It is changed in 0nsec steps.

Also, if this period is [25G r= = 375 Hz...
- (6) Next, let the speed information signal (a) be N, N=1, and the division coefficient of the first frequency dividing section (3) be n.

The speed is set to 2250 s/s using the frequency division coefficient of f-circuit 2 equation (7).
Since it can only be set as an integer multiple of ec, here we temporarily set it to 1.
00 times the resolution (set every 22.5 m/sec), and set it at 1/100 times the value of n, n = 666.
, 66. Therefore, the speed is 2250s/sec
The speed information signal (a) 2N at the time of is.

rn: 175X666.66 Therefore, 2 formulas (8
), the speed information signal (
b): N is 100.

[Problem to be solved by the invention]

Conventional pseudo target signal generation devices are operated using the method described above and are configured as described above, so that the pseudo target receives speed information signals and distance information signals from external equipment, and then generates the following information: Until the speed information signal and distance information signal are received, uniform linear motion is performed that moves the distance from the distance information signal by the distance resolution based on the speed from the first speed information signal received. . However, if the pseudo target has a very large acceleration, the distance to the pseudo target immediately before receiving the next speed information signal and distance information signal, and the distance immediately after receiving the next speed information signal and distance information signal. There is a large difference between the distance to the simulated target and the speed appears to change rapidly, so changes in the speed and distance of the simulated target signal are significantly different from changes in the signal reflected from the actual target. There was an issue. This invention was made in order to solve the problems mentioned above.By changing the speed and distance of the pseudo target signal in consideration of acceleration, a signal that is closer to the signal reflected from the actual target can be obtained. The purpose of this invention is to obtain a method and device capable of generating .

[Means to solve the problem]

The method and device for generating a pseudo target signal according to the present invention include an acceleration information signal inputted from an external device, and a second frequency dividing circuit at the output end of the first phase adjustment section and the output end of the acceleration information signal. A second speed counter section is connected to the speed information signal and the output end of the second frequency dividing section, and a second speed counter section is connected to the output end of the first speed counter section and the output end of the second speed counter section. is connected to a second phase adjustment section. [Operation] The method and device for generating a pseudo target signal in this invention calculate the acceleration from the acceleration information signal and the speed from the first received speed information signal. Based on this, until the next speed information signal is received, in order to make the pseudo target signal perform a movement approximating a uniformly accelerated movement, the speed is changed at intervals of time corresponding to the distance resolution according to the speed that changes with acceleration. A new clock signal is generated, and the delay time is changed every cycle of this clock signal. Therefore, when the distance from the distance information signal and the speed from the speed information signal are received next, it is ensured that there is no large difference from the distance and speed immediately before reception, and the pseudo target moves with a large acceleration. Even in this case, the variation in velocity and distance of the pseudo target signal is such that it is possible to more closely approximate that of a signal reflected from a real target.

〔Example〕

An embodiment of the present invention will be explained below with reference to the drawings. In FIG. 1, (a), (b), (c), (1) to (4),
(8) to (10) and (12) are the same as or equivalent to those in FIG. 2, and (d) is an acceleration information signal of a pseudo target input from an external device. (5) receives the acceleration information signal (d) of the pseudo target, and the first phase adjustment unit (2)
) for changing a coefficient for dividing the frequency of the reference signal from the reference signal generating section (1) according to the magnitude of acceleration. (6) is a second speed counter unit that receives the speed information signal (a) of the pseudo target and determines the cycle for changing the distance to the pseudo target for each distance resolution according to the speed that changes with acceleration. . (7) is a second phase adjustment section that adjusts the phase of the signal from the first speed counter section (4) and the signal from the second speed counter section (6). (11) is the second speed counter section (6)
The second smoothing clock signal is the output signal from the second smoothing clock signal.

Next, the method of generating a pseudo target signal according to the present invention and the operation of the apparatus will be explained using FIG. Fourth
The figure shows the timing relationship between the first smoothing clock signal (io) and the second smoothing clock signal (11). The first speed counter section (4) receives the speed information signal (a) and outputs a first smoothing clock signal (1G) every time required to move a distance corresponding to the distance resolution at this speed. It is occurring. Therefore, during the − period of the first smoothing clock signal (12), the pseudo target is in uniform motion, and the speed does not change until the next speed information signal (a) and distance information signal (b) are sent. and distances are calibrated. Therefore, when the acceleration of the pseudo target is very large, the separation of the pseudo target changes significantly every cycle of the first smoothing clock signal (12), so the second frequency dividing section (5) Based on the acceleration information signal (d), the frequency of the reference signal from the reference signal generation section (1) is changed via the first phase adjustment section (2), and the frequency of the reference signal from the reference signal generation section (1) is changed to the second speed counter section (6). Then, during each cycle of the first smoothing clock signal (10), the second smoothing clock signal (10) is transmitted every time required to move a distance corresponding to the distance resolution at a speed that changes with acceleration. 11) is occurring. The second smoothing clock signal (11) is then sent to the second phase adjustment section (7), matched in phase with the first smoothing clock signal (10), and stored in the storage section (9). It has been entered. Therefore, the time until the information of the transmission signal (a) inputted on -day is called again changes every cycle of the second smoothing clock signal (11) from the second speed counter section (6). become. Therefore, the information of the transmitted signal (a) that has undergone a giant force is the distance information signal (c).
The second smoothing clock signal (11) is written from the address position of the RAM of the storage unit (9) corresponding to the distance from the speed information signal (b) and corresponds to the speed and distance resolution from the speed information signal (b). Since the position of the address to be written is changed, the delay time of the pseudo target signal (12) can be freely changed with respect to the transmission signal (a) in consideration of the acceleration of the pseudo target.

〔Effect of the invention〕

As described above, according to the present invention, when the pseudo target is moving with a very large acceleration, the acceleration information of the pseudo target is obtained and the second frequency dividing section and the second speed counter section are used. Then, a new lobe signal is generated every time corresponding to the distance resolution according to the speed that changes with acceleration.

By changing the address position of the storage section in which the information of the transmission signal is written every cycle of this clock signal, it is possible to bring the pseudo target signal closer to the reflected signal from the actual target.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing an example of a conventional method, Fig. 3 is a diagram used to explain an embodiment of the conventional method, Fig. 4 1 is a diagram used to illustrate an embodiment of the present invention. In the figure, (a)
is a transmission signal, (b) is a speed information signal, (c) is a distance information signal, (d) is an acceleration information signal, (1) is a reference signal generation section, (2) is a first phase adjustment section, (3) ) is the first frequency dividing section, (4) is the first speed counter section, (5) is the second frequency dividing section, (6) is the second speed counter section, (7) is the second phase The adjustment section (8) is a range delay part, (9) is a storage section, (10) is a first smoothing clock signal, (If) is a second smoothing clock signal, (
12) is a pseudo target signal. Note that in the two figures, the same reference numerals indicate the same or corresponding parts. Figure 2

Claims (2)

[Claims] (1) In the method of generating simulated reflected radio waves when the radio waves transmitted to the target from the radio wave transmitting side are reflected from the target, the velocity, acceleration,
And in order to give the pseudo target signal a movement according to the distance,
A reference signal generation unit is provided that generates a signal having a repetition period equal to the distance resolution of the pseudo target, the signal from the reference signal generation unit is used as a clock signal, pulse information of the transmitted radio wave is received from an external device, and this pulse is When writing information to the address position of the storage unit, the first phase adjustment unit synchronizes the clock signal with the pulse information of the transmitted radio wave, and calculates the distance from the side transmitting the radio wave to the pseudo target. In order to receive distance information from an external device, start writing from the address position corresponding to this distance, and change this address position at every cycle of time required for the pseudo target to move a distance equivalent to the distance resolution. First of all, while the speed information of the pseudo target is given, the pseudo target moves at a constant velocity, and the frequency of the signal from the reference signal generation section is divided by the first frequency dividing section. The signal is input to the first speed counter section, and the first speed counter section receives speed information of the pseudo target from an external device, so that the pseudo target moves a distance corresponding to the distance resolution at this speed. A first smoothing clock signal having a period of time required for The second frequency dividing section receives the acceleration information of the pseudo target from an external device, generates a signal having a relatively higher frequency than the output signal from the first frequency dividing section, and sends the signal to the second speed counter section. input, generate a second smoothing clock signal whose period is the time required for the pseudo target to move a distance corresponding to the distance resolution with this acceleration and velocity, The second smoothing clock signal and the second smoothing clock signal are synchronized in the second phase adjustment section, this synchronized signal is input to the storage section, and the signal is transmitted every cycle of this signal. The position of the address where the pulse information of the radio wave is written is changed, and then this written pulse information is read out from the address of the storage unit using the signal from the reference signal generation unit as a clock signal, and this read information is A pseudo target signal generation method using as a pseudo target signal. (2) Information on the pseudo target signal from external equipment includes a transmission signal indicating radio wave pulse information from the side transmitting radio waves, a speed information signal indicating the speed of the pseudo target, and a pseudo target from the side transmitting radio waves. a reference signal generating section that receives a distance information signal indicating the distance of the pseudo target signal and generates a signal having a repeating period of time corresponding to the distance resolution of the pseudo target signal; connected to a first phase adjustment section that matches the phase of the transmission signal and the signal from the reference signal generation section; and an output end of the first phase adjustment section, which adjusts the phase of the signal from the first phase adjustment section. A first frequency dividing section that divides the frequency is connected to the speed information signal and an output terminal of the first frequency dividing section, and while the speed information signal is being sent, the pseudo target is caused to move at a constant velocity. a first speed counter section that generates a signal for causing the transmission; a range delay section that is connected to the distance information signal and determines the distance from the radio wave transmitting side to the pseudo target; Connected to the output end of the phase adjustment section, the output end of the first speed counter section, and the output end of the range delay section, gives pseudo target information to the pulse information of the transmission signal and writes it, and reads it out as a pseudo target signal. An acceleration information signal of a pseudo target is inputted from an external device to a pseudo target signal generating device comprising a storage section, which is connected to the output terminal of the first phase adjustment section and the acceleration information signal, and A second frequency dividing section that divides the frequency of the signal from the first phase adjustment section is connected, and the speed information signal and the output terminal of the second frequency dividing section are used to apply acceleration motion to the pseudo target. A second speed counter unit that generates a signal for speeding is connected to the output terminal of the first speed counter unit and the output terminal of the second speed counter unit, and the second speed counter unit is connected to the output terminal of the first speed counter unit and the second speed counter unit, A pseudo target signal generating device characterized in that a second phase adjustment section is connected to match the phase of the signal from the second speed counter section with the signal from the second speed counter section.