JPH02183188A - 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 phase adjusting unit 2 and an output terminal of the acceleration data signal are connected to a frequency demultiplier unit 5. A speed data signal and an output terminal of the frequency demultiplier 5 are connected to a speed counter unit 6. Moreover, an output terminal of a speed counter unit 4 and an output terminal of the speed counter unit 6 are connected to a phase adjusting unit 7. On the basis of the acceleration obtained from the acceleration data signal and the speed from the speed data signal received first, a clock signal is generated every corresponding time to the distance resolution in accordance with the speed changing with an acceleration before the next speed data signal is received. A delay time is changed every period of this clock signal. Accordingly, even when the simulated object moves with large acceleration, a signal from the simulated object can be closer to a signal reflected from the actual object.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to speed changes of a pseudo target in a pseudo target signal generator and v1311! It concerns a method of change and an apparatus therefor.

[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 the pseudo target, a speed information signal indicating speed, 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 period for changing the distance to the pseudo target by the distance resolution in accordance with the speed. (8) is the transmission signal (
A determination circuit section that examines the timing relationship between the output signal from the first speed counter section (a) and the output signal from the first speed counter section (4); (4) A switch unit that determines the destination of the output signal from the first speed counter unit (1G), a delay circuit that delays the output signal from the first speed counter unit (4) until the time equal to the pulse width of the transmission signal ends. Part (11) is a range delay part that receives the distance information signal of the pseudo target and determines the distance to the pseudo target. (12) is a storage unit that stores the information of the transmission signal (a) and reads it out again. (13) is a first smoothing clock signal which is an output signal from the first speed counter section (4). (15) is the storage section (12
) is the pseudo target signal that is the output signal from

Next, the operation will be explained using FIG. 3. FIG. 3 shows the addresses of the RAM in the storage unit (12).

The state in which the information of the transmission signal (a) is written and read out over time is shown.

At this time, the RAM of the storage section (12) is stored in the first frequency dividing section (3
), the information of the transmission signal (A) is written and read using the reference signal from the reference signal generator (1) whose phase is matched with the transmission signal (A) as a clock signal. Therefore, the information of the transmission signal (a) is stored in the RAM of the storage section (12).
The time required for one operation to write to and read out determines the distance resolution of the pseudo target, and this time is the repetition time of the reference signal from the reference signal generator (1). Normally, this repetition time is selected to be sufficiently small compared to the time required for an aircraft, etc., which is the object of the 1wJ pseudo-target, to travel a distance equivalent to the range resolution, and the distance change of the pseudo-target is finely (settable) 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).Then, !N In order to obtain the time it takes for a similar target to travel a distance corresponding to the distance resolution, the frequency of the reference signal from the reference signal generator (1) is first converted to a lower value in the first frequency dividing section (3). The first speed counter section (4) receives the speed information signal (b) and calculates the first speed signal every time required to travel a distance corresponding to the distance resolution at this speed. The first smoothing clock signal (13) is generated by the first smoothing clock signal (14).
) and the timing relationship with the transmitted signal (a) is investigated. First smoothing clock signal (13
) occurs when information about the time when the transmission signal (a) is not being transmitted is written into the RAM of the storage unit (12), after being determined by the 2 determination circuit unit (8),
The data is sent to the storage section (12) via the switch section (9). Therefore, the storage section (
The address position of the RAM 12) is changed every cycle of the first smoothing clock signal (13). In addition, the storage unit (13) stores information about the time when the first smoothing clock signal (13) is transmitting the transmission signal (a).
If the occurrence occurs while writing to the RAM in step 12), it is determined by the 2-determination circuit section (8), and then the switch section (9)
The signal is inputted to the delay circuit section (10) via the transmission signal (a), and is delayed until the transmission time of the transmission signal (a) ends, and then sent to the storage section (12). Therefore, the address position of the RAM of the storage unit (12) in which the information of the transmission signal (a) is written is delayed and changed every cycle of the first smoothing clock signal (13). Therefore,
In either case, the time until the information of the transmission signal (a) once input is called again is determined by the first smoothing clock signal (a) from the first speed counter section (4).
13) will change every cycle. Then, the distance information signal (c) is input to the range delay part (11),
A delay time corresponding to this distance is determined, a calculation is performed to determine how many times this delay time corresponds to the distance resolution, the position of an address corresponding to this multiple is determined, and a transmission signal (A) is sent to this address. information is written. Therefore, the information of the input transmission signal (a) is the distance information signal ()
The cycle of the first smoothing clock signal (13) is written from the address position of the RAM of the storage unit (12) corresponding to the distance from the speed information signal (b) and is determined by the speed and distance resolution from the speed information signal (b). Since the address position to be written is changed each time, the delay time of the pseudo target signal can be freely changed with respect to the transmitted signal.

Next, a specific example will be provided and explained.

Repetition frequency of reference signal F=2541z...
(1) Pseudo target speed V = 2250cm/5ec (approximately equivalent to Matsuha 7...(
2) Distance resolution of pseudo target T = 40nsec (1725MHz) −
(3) The distance H:R, which corresponds to the distance resolution, is given by the propagation speed of radio waves 20 as C=3-OX lO''a/sec.

C-T 3.0 is 10@X10-" Therefore, if the time required for the pseudo target to move the distance resolution is t, then t = = 2666 μsec... (5)
Therefore, the delay time of the pseudo target is 4 times every 2666 μsec.
It is changed in 0nsec steps.

Further, if this period is f, then let the speed information signal (a) be N, and let N=1 be the frequency division coefficient n of the first frequency division section (3).

f-N 375 However, with the frequency division coefficient of formula 2 (7), the speed is 225On+/s
Since it can only be set as an integer multiple of ec, here we temporarily set it to 1.
It is assumed to have a resolution of 00 times (set every 22.5 m/sec), and is set at t/loo times the value of n, so that n = 66
6,66. Therefore, the speed is 2250m/sec
The speed information signal (a) 2N at the time of c.

・n 375x666.66 Therefore, when the speed is 2250 m/sec according to equation 1 (8), the speed information signal (A): N is 100.

[Problem to be Solved by the Invention] Since the conventional pseudo target signal generating device is operated by the above method and is configured in one or more ways, the pseudo target is generated by receiving a speed information signal and a speed information signal from an external device. From the time a distance information signal is received until the next speed information signal and distance information signal are received, the distance from the distance information signal is changed by the distance resolution based on the speed from the first speed information signal received. It is performing uniform linear motion. However, if the two pseudo targets have 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 to the pseudo target immediately after receiving the next speed information signal and distance information signal. There is a large difference between the distance to the pseudo target and the speed appears to have changed rapidly, so the change in speed and distance of the pseudo target signal is significantly different from the change in the signal reflected from the actual target. There was an issue of being different.

This invention was made to solve the above-mentioned problems, and 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 is to obtain a method and device that can generate this.

[Means for Solving the Problems] A pseudo target signal generation method and device according to the present invention include an acceleration information signal input from an external device, an output terminal of a first phase adjustment section, and an output of the acceleration information signal. A second branch section is connected to the end, a second speed counter section is connected to the output end of the speed information signal and the second branch section, and a second speed counter section is connected to the output end of the first speed counter section and the second speed information signal. A second phase adjustment section is connected to the output end of the counter section. [Function] The method and device for generating a pseudo target signal in this invention are based on the acceleration information signal and the initially received velocity. Based on the speed from the information signal, until the next speed information signal is received, the pseudo target signal is moved away according to the speed that changes with acceleration in order to make a motion similar to uniformly accelerated motion. A new clock signal is generated every time corresponding to the resolution, and the delay time is changed every cycle of this clock signal. Therefore, when the next time the distance from the distance information signal and the speed from the speed information signal are received, there is no large difference from the distance and speed immediately before reception, and the pseudo target has a large acceleration (t). Even when the target is moving, the changes in speed and distance of the pseudo target signal can be more similar to those of a signal reflected from a real target.

``Example'' In FIG. 1, an embodiment of the present invention will be explained with reference to the drawings (a), (b), (c), (1) to (4),
(8) to (13) and (15) 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)
) A second frequency dividing section that changes a coefficient for dividing the frequency of the reference signal from the reference signal generating section (1) according to the magnitude of the acceleration. (6) is a second speed that receives the speed information signal (a) of the pseudo target and determines the cycle for changing the distance to the #J pseudo target for each distance resolution according to the speed that changes with acceleration. counter section. (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). (14) is the second speed counter section (6
) is the second smoothing clock signal.

Next, the method for generating a pseudo target signal according to the present invention and the operation of the apparatus will be explained using FIG. FIG. 4 shows the timing relationship between the first smoothing clock signal (13) and the second smoothing clock signal (14). The first speed counter (4) receives the speed information signal (a) and generates a first smoothing clock signal (13) every time required to travel a distance corresponding to the distance resolution at this speed. I'm letting you do it. Therefore, during the − period of the first smoothing clock signal (13), the pseudo target is in uniform motion, and it is not until the second speed information signal (a) and the distance information signal (b) are sent. Speed and distance are calibrated. Therefore, when the acceleration of the pseudo target is very large, the distance of the pseudo target changes significantly every cycle of the first smoothing clock signal (13), so the second branch section (5) uses acceleration information. signal(
Based on (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 in the second speed counter section (6). A second smoothing clock signal (14) is generated every time necessary to move a distance corresponding to the distance resolution at a speed that changes with acceleration during - periods of the smoothing clock signal (13). I'm letting you do it. The second smoothing clock signal (14) is then sent to the second phase adjustment section (
7) and the first smoothing black/yellow signal (1
3) and sent to the 2 judgment circuit section (8). The determination circuit (8) examines the timing relationship between the transmission signal (A) and the second smoothing clock signal (14), and compares the transmission time of the transmission signal (A) with the second smoothing clock signal (I4). ), the second smoothing clock signal (14) is sent from the switch section (9) to the delay circuit section (!O
) and is delayed until the transmission time of the transmission signal (a) ends, and then input to the storage unit (12), and the transmission time of the transmission signal (a) is processed by second smoothing. If the second smoothing clock signal (I4) does not overlap with the clock of the clock signal (14), the second smoothing clock signal (I4) is sent from the switch section (9) to the storage section (12). Therefore, the time until the information of the transmitted signal (a) once input is called again is determined by the second smoothing clock signal (14) from the second speed counter section (6).
It will change every cycle. Therefore, the information of the transmitted signal (a) input once is written from the address position of the RAM of the storage unit (12) corresponding to the distance from the distance information signal (c), and from the speed information signal (b). a second smoothing clock (14
) Since the position of the address to be written is changed every cycle, the delay time of the pseudo target signal (15) can be freely changed with respect to the transmission signal (a), taking into account the acceleration of the pseudo target. I can do things.

〔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 branch section and the second speed counter section are used to calculate the acceleration. By generating a new lock signal at intervals of time corresponding to the distance resolution in accordance with the speed at which the clock signal changes, and changing the address position of the storage section in which the information of the transmission signal is written every cycle of this clock signal. This has the effect of making it 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, 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 Adjustment section. (8) is the judgment circuit section, (9) is the switch section, (1G)
is the delay circuit part, (11) is the range delay part, (1
2), the storage unit (13) is the first smoothing clock signal, (14) is the second smoothing clock signal,
(15) is a pseudo target signal. Note that the same reference numerals 7 in Figure 1 indicate the same or corresponding parts.

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, it is assumed that the pseudo target moves at a constant velocity while the speed information of the pseudo target is given, and the frequency of the signal from the reference signal generation section is divided by the first frequency dividing section. The frequency-divided signal is input to the first speed counter section, the first speed counter section receives speed information of the pseudo target from an external device, and the pseudo target moves at this speed over a distance corresponding to the distance resolution. 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 generates a signal having a relatively higher frequency than the output signal from the first frequency dividing section. is input to 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 using the acceleration and velocity. Then, the first smoothing clock signal and the second smoothing clock signal are synchronized in a second phase adjustment section, and the synchronized second smoothing clock signal is input to the determination circuit section. , we investigated the timing relationship with the transmission signal and found that the clock of the synchronized second smoothing clock signal occurred when the clock of the second smoothing clock signal was writing information on the time when the transmission signal was not being transmitted to the RAM of the storage unit. In this case, after being determined by the determination circuit section, the address is sent to the storage section via the switch section, and the address position of the RAM of the storage section in which the information of the transmission signal is written is determined by the synchronized second smoothing clock signal. Second, if the clock of the second synchronized smoothing clock signal occurs when information about the time at which the transmission signal is being transmitted is being written to the RAM of the storage unit, After being determined by the determination circuit section, the signal is input to the delay circuit section via the switch section, where it is delayed until the transmission time of the transmission signal ends, and then sent to the storage section, where the information on the transmission signal is stored. The address position of the RAM of the storage section to be written is changed every cycle of the delayed and synchronized second smoothing clock signal. Next, this written pulse information is read out from an address in the storage section using a signal from a reference signal generation section as a clock signal, and this read information is used 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 unit that generates a signal to cause the speed counter to perform the transmission, the transmission signal, and an output terminal of the first speed counter unit, and the transmission signal and the first speed counter unit that output the transmission signal from the first speed counter unit. It is connected to a judgment circuit section that examines the timing relationship of the smoothing clock signal and the output terminal of the judgment circuit section, and is connected to a switch section that switches the flow of the signal from the judgment circuit section and the output terminal of the switch section. a delay circuit section that delays the signal; a range delay section that connects to the distance information signal and determines the distance from the radio wave transmitting side to the pseudo target; and an output end of the transmission signal and the first phase adjustment section. , connected to the output end of the switch section, the output end of the delay circuit section, and the output end of the range delay section, a memory that gives pseudo target information to the pulse information of the transmission signal and writes it, and is read out as a pseudo target signal. In the pseudo target signal generating device, which is comprised of a pseudo target signal generator, an acceleration information signal of a pseudo target is inputted from an external device, and is connected to the output terminal of the first phase adjustment section and the acceleration information signal. 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 cause the pseudo target to perform an accelerated motion. A second speed counter section that generates a signal for is connected to the output terminal of the first speed counter section and the output terminal of the second speed counter section. A pseudo target signal generating device characterized in that a second phase adjustment section is connected to match the phase of the signal and the signal from the second speed counter section.