Adjustable radar emission modulation waveform circuit

Abstract

The utility model relates to the field of radar emission modulation waveform generation, in particular to an adjustable radar emission modulation waveform circuit, which comprises a singlechip module, a PWM (Pulse Width Modulation) filtering module and an R2R resistor module, the first output end and the second output end of the single-chip microcomputer module are electrically connected with the input end of the PWM filtering module and the input end of the R2R resistor module respectively, the output end of the PWM filtering module is electrically connected with the R2R resistor module, the single-chip microcomputer module outputs two paths of PWM waveform signals, and the PWM filtering module modifies the duty ratio of the PWM waveform signals and modifies the reference voltage of a square wave signal VT; the R2R resistor module modifies the frequency of the PWM waveform signal and modifies the frequency of the square wave chip VT. The VT output square wave parameter can be controlled without modifying the resistance value and the capacitance value only by changing the duty ratio and the frequency of the two paths of PWM signals, so that the flexibility of the whole circuit is greatly improved, the use of a DAC module is avoided, and the cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of radar transmitting modulation waveform generation, and particularly relates to an adjustable radar transmitting modulation waveform circuit. Background Technique

[0002] The radar transmitting modulation waveform is an important part of radar signal processing. It determines the characteristics of the radar transmitting signal, such as frequency, phase, amplitude, etc. These characteristics are crucial for radar target detection, tracking, and recognition. The modulation methods of radar transmitting waves include, but are not limited to, amplitude modulation (AM), frequency modulation (FM, such as linear frequency modulation LFM), phase modulation (PM), and pulse width modulation (PWM), etc.

[0003] The R2R resistor network (R-2R Ladder Network) is usually associated with a digital-to-analog converter (DAC) and is used to convert digital signals into analog signals. However, in the direct application of radar transmitting modulation waveforms, the R2R resistor network does not directly provide the modulation waveforms required for radar transmission. Instead, it is more of an implementation method of the DAC and is used to generate or adjust the analog signals that may be required inside the radar system. Among them, the cost of the DAC module is relatively high, and the production cost is large. In addition, the traditional R2R resistor network needs to modify the resistor value to change the reference voltage. Or use a PWM signal to generate a square wave waveform through a filter circuit to provide a waveform for radar transmitting modulation. However, for the PWM filter circuit to output a square wave with adjustable high and low levels, when modifying the PWM waveform frequency, it is necessary to modify the resistor value and capacitor value, and the flexibility of the overall circuit is relatively poor. Content of the Utility Model

[0004] The purpose of the utility model is to provide an adjustable radar transmitting modulation waveform circuit, aiming to improve the problems of high cost caused by using a relatively expensive DAC module; and the need to modify the resistor value to change the reference voltage when using a traditional R2R resistor network; and the relatively poor flexibility of the overall circuit when using a PWM filter circuit to output a square wave with adjustable high and low levels and modifying the PWM waveform frequency requires modifying the resistor value and capacitor value.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An adjustable radar transmitting modulation waveform circuit includes a single-chip microcomputer module, a PWM filter module, and an R2R resistor module;

[0007] The first output end and the second output end of the single-chip microcomputer module are respectively electrically connected to the input ends of the PWM filter module and the R2R resistor module. The output end of the PWM filter module is electrically connected to the R2R resistor module. The output end of the R2R resistor module outputs a square wave signal VT.

[0008] The single-chip microcomputer module outputs two PWM waveform signals, which are respectively output to the PWM filtering module and the R2R resistor module. The PWM filtering module modifies the duty cycle of the PWM waveform signal, and the R2R resistor module modifies the frequency of the PWM waveform signal.

[0009] Further, the PWM filtering module includes a first filtering circuit and a second filtering circuit, and the first filtering circuit and the second filtering circuit are connected in series between the first output end of the single-chip microcomputer module and the R2R resistor module.

[0010] Further, the first filtering circuit includes a resistor R1 and a capacitor C1;

[0011] One end of the resistor R1 is electrically connected to the first output end of the single-chip microcomputer module, the other end of the resistor R1 is electrically connected to one end of the capacitor C1 and the input end of the second filtering circuit, and the other end of the capacitor C1 is grounded.

[0012] Further, the second filtering circuit includes a resistor R2 and a capacitor C2;

[0013] One end of the resistor R2 is electrically connected to the other end of the resistor R1, the other end of the resistor R2 is electrically connected to one end of the capacitor C2 and the R2R resistor module, and the other end of the capacitor C2 is grounded.

[0014] Further, the R2R resistor module includes a resistor R3, a resistor R4, and a resistor R5;

[0015] One end of the resistor R4 is electrically connected to the second output end of the single-chip microcomputer module, the other end of the resistor R4 is electrically connected to one end of the resistor R3 and one end of the resistor R5, and is used as an output end to output a square wave signal VT;

[0016] The other end of the resistor R3 is electrically connected to the output end of the PWM filtering module, and the other end of the resistor R5 is grounded.

[0017] Further, both the resistor R1 and the resistor R2 are adjustable resistors, and both the capacitor C1 and the capacitor C2 are adjustable capacitors.

[0018] Further, the resistor R3, the resistor R4, and the resistor R5 are all adjustable resistors.

[0019] After adopting the above technical solution, compared with the background technology, the present utility model has the following advantages:

[0020] The single-chip microcomputer module outputs two PWM waveform signals, which are respectively output to the PWM filtering module and the R2R resistor module. The PWM filtering module modifies the duty cycle of the PWM waveform signal and modifies the reference voltage of the square-wave signal VT; the R2R resistor module modifies the frequency of the PWM waveform signal and modifies the frequency of the square-wave chip VT. Only by changing the duty cycle and frequency of the two PWM signals, the square-wave parameters output by VT can be controlled without modifying the resistance value and capacitance value, greatly improving the flexibility of the overall circuit, avoiding the use of the DAC module, with a simple overall circuit structure and effectively reducing costs. Description of the Drawings

[0021] Figure 1 It is a block diagram of the adjustable radar transmitting modulation waveform circuit described in the present invention;

[0022] Figure 2 It is a circuit diagram of the adjustable radar transmitting modulation waveform circuit described in the present invention. Detailed Embodiment

[0023] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] In addition, it should be noted that: the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, so it cannot be understood as a limitation to the present invention.

[0025] When an element is referred to as being "fixed to" or "set on" or "provided on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0026] Unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Embodiment

[0028] Please refer to Figure 1 and Figure 2 As shown, this embodiment provides an adjustable radar transmitting modulation waveform circuit, which includes a single-chip microcomputer module, a PWM filtering module, and an R2R resistor module. The first output terminal and the second output terminal of the single-chip microcomputer module are electrically connected to the input terminals of the PWM filtering module and the R2R resistor module respectively. The output terminal of the PWM filtering module is electrically connected to the R2R resistor module, and the output terminal of the R2R resistor module outputs a square wave signal VT.

[0029] Please refer to Figure 2 As shown, specifically, the PWM filtering module includes a first filtering circuit and a second filtering circuit. The first filtering circuit and the second filtering circuit are connected in series between the first output terminal of the single-chip microcomputer module and the R2R resistor module.

[0030] Among them, the first filtering circuit includes a resistor R1 and a capacitor C1; one end of the resistor R1 is electrically connected to the first output terminal of the single-chip microcomputer module, the other end of the resistor R1 is electrically connected to one end of the capacitor C1 and the input terminal of the second filtering circuit, and the other end of the capacitor C1 is grounded.

[0031] Among them, the second filtering circuit includes a resistor R2 and a capacitor C2; one end of the resistor R2 is electrically connected to the other end of the resistor R1, the other end of the resistor R2 is electrically connected to one end of the capacitor C2 and the R2R resistor module, and the other end of the capacitor C2 is grounded.

[0032] The first filtering circuit and the second filtering circuit form two series-connected RC filtering circuits to adjust the duty cycle of the PWM signal. And effectively reduce the noise of the square wave signal VT, ensure the integrity of the VT signal waveform, and improve the reliability and stability of the radar transmitting modulation waveform circuit.

[0033] Please refer to Figure 2 As shown, specifically, the R2R resistor module includes a resistor R3, a resistor R4, and a resistor R5; one end of the resistor R4 is electrically connected to the second output terminal of the single-chip microcomputer module, the other end of the resistor R4 is electrically connected to one end of the resistor R3 and one end of the resistor R5, and serves as the output terminal to output the square wave signal VT.

[0034] The other end of the resistor R3 is electrically connected to the output terminal of the PWM filtering module, that is, the other end of the resistor R3 is electrically connected to the other end of the resistor R2; the other end of the resistor R5 is grounded.

[0035] In this embodiment, resistor R1, resistor R2, resistor R3, resistor R4, and resistor R5 are all adjustable resistors, and capacitor C1 and capacitor C2 are both adjustable capacitors. By setting the resistors and capacitors of the PWM filtering module and the R2R resistor module as adjustable resistors and adjustable capacitors, different resistance values and capacitance values can be set according to different radar modulation waveform requirements, which has better practicability.

[0036] When the resistance value and capacitance value are fixed, the single-chip microcomputer module outputs two PWM waveform signals, which are respectively output to the PWM filtering module and the R2R resistor module. The PWM filtering module modifies the duty cycle of the PWM waveform signal and modifies the reference voltage of the square wave signal VT; the R2R resistor module modifies the frequency of the PWM waveform signal and modifies the frequency of the square wave chip VT. Only by changing the duty cycle and frequency of the two PWM signals, the square wave parameters output by VT can be controlled without modifying the resistance value and capacitance value, greatly improving the flexibility of the overall circuit, avoiding the use of the DAC module, having a simple overall circuit structure, and effectively reducing costs. At the same time, since the square wave signal can be spliced into other signals such as triangular waves, it provides a flexible and adjustable solution for the diversified development of similar products on the current market.

[0037] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An adjustable radar transmission modulation waveform circuit, characterized in that: Including single chip microcomputer module, PWM filter module and R2R resistor module; The first output terminal and the second output terminal of the single-chip module are electrically connected to the input terminals of the PWM filter module and the R2R resistor module respectively, the output terminal of the PWM filter module is electrically connected to the R2R resistor module, and the output terminal of the R2R resistor module outputs a square wave signal VT. The single-chip microcomputer module outputs two PWM waveform signals, which are respectively output to the PWM filter module and the R2R resistor module. The PWM filter module modifies the duty cycle of the PWM waveform signal, and the R2R resistor module modifies the frequency of the PWM waveform signal.

2. The adjustable radar transmission modulation waveform circuit according to claim 1, characterized in that: The PWM filter module includes a first filter circuit and a second filter circuit, and the first filter circuit and the second filter circuit are connected in series between the first output terminal of the single-chip computer module and the R2R resistor module.

3. The adjustable radar transmission modulation waveform circuit according to claim 2, characterized in that: The first filtering circuit includes a resistor R1 and a capacitor C1; One end of the resistor R1 is electrically connected to the first output end of the single chip microcomputer module, the other end of the resistor R1 is electrically connected to one end of the capacitor C1 and the input end of the second filter circuit, and the other end of the capacitor C1 is grounded.

4. The adjustable radar transmission modulation waveform circuit according to claim 3 is characterized in that: The second filtering circuit includes a resistor R2 and a capacitor C2; One end of the resistor R2 is electrically connected to the other end of the resistor R1 , the other end of the resistor R2 is electrically connected to one end of the capacitor C2 and the R2R resistor module, and the other end of the capacitor C2 is grounded.

5. The adjustable radar transmission modulation waveform circuit according to claim 1, characterized in that: The R2R resistor module includes a resistor R3, a resistor R4 and a resistor R5; One end of the resistor R4 is electrically connected to the second output end of the single chip module, and the other end of the resistor R4 is electrically connected to one end of the resistor R3 and one end of the resistor R5, and serves as an output end to output a square wave signal VT; The other end of the resistor R3 is electrically connected to the output end of the PWM filter module, and the other end of the resistor R5 is grounded.

6. The adjustable radar transmission modulation waveform circuit according to claim 4, characterized in that: The resistor R1 and the resistor R2 are both adjustable resistors, and the capacitor C1 and the capacitor C2 are both adjustable capacitors.

7. The adjustable radar transmission modulation waveform circuit according to claim 5, characterized in that: The resistor R3, the resistor R4 and the resistor R5 are all adjustable resistors.

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