Radar local oscillator module
By adopting a multi-module combination structure in the microwave receiver, including the S-band and X-band phase-locked signal source module and the PLL-VCDRO signal source module, the problem that the existing technology cannot meet the high frequency requirements is solved, and more efficient frequency is achieved Output and system performance improvements.
Patent Information
- Application Number
- CN202420465803.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-12
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-03-12
AI Technical Summary
The existing microwave receiver local oscillator module frequency synthesis technology cannot meet the high requirements of radar and communication systems for frequency sources that have improved with the advancement of technology.
Adopt the combined structure of the S-band phase-locked signal source module, the X-band phase-locked signal source module, the X-band PLL-VCDRO signal source module and the Ku-band PLL-VCDRO signal source module, and the Ku-band PLL-VCDRO signal source module is adopted, and the integrated digital phase detection chip is integrated, and the loop filtering is carried out through a microcontroller, integrated digital phase detection chip, and loop filtering. The circuit design of circuits such as the voltage controlled oscillator and mixer realizes multi-frequency output and improves the performance of the frequency source.
It realizes more efficient frequency output, improves the system's frequency source performance, simplifies system integration, debugging, detection and maintenance, and meets the needs of high frequency requirements.
Smart Images
Figure CN222339390U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of local oscillator modules, in particular to a radar local oscillator module. Background Art
[0002] Microwave receivers are widely used in radar, communication and weapon guidance systems. There are many types of receivers, usually divided into crystal video receivers, superheterodyne receivers, instantaneous frequency measurement receivers, channelized receivers, compression receivers and Bragg box receivers. Superheterodyne receivers are widely used in microwave receivers because of their high selectivity, high sensitivity and large dynamic range.
[0003] A basic superheterodyne microwave receiver consists of five components: a mixer, a local oscillator (LO) module, an intermediate frequency (IF) filter, an intermediate frequency amplifier, and a detector [2]. The local oscillator module is the core component of a superheterodyne microwave receiver, and its performance directly affects the performance of the receiver.
[0004] The local oscillator module of a microwave receiver is generally implemented using frequency synthesis technology. With the advancement of technology, radar, communication and other systems have higher and higher requirements for frequency sources, and a single frequency synthesis method can no longer meet the requirements.
[0005] Therefore, a radar local oscillator module has become an issue that needs to be solved urgently. Utility Model Content
[0006] The technical problem to be solved by the utility model is that the local oscillator module of the microwave receiver is generally implemented by frequency synthesis technology. With the advancement of technology, radar, communication and other systems have higher and higher requirements for frequency sources, and a single frequency synthesis method can no longer meet the requirements.
[0007] To solve the above technical problems, the technical solution provided by the utility model is: a radar local oscillator module, the radar local oscillator module includes an S-band phase-locked signal source module, an X-band phase-locked signal source module, an X-band PLL-VCDRO signal source module and a Ku-band PLL-VCDRO signal source module, the S-band phase-locked signal source module includes two parts with output frequencies of 2.63-3.38 GHz and 2.9425-3.6925 GHz; the output frequency of the X-band phase-locked signal source module is 10-11.5 GHz; the X-band PLL-VCDRO signal source module includes two frequency points with output frequencies of 11.87 GHz and 12.245 GHz; the output frequency of the Ku-band PLL-VCDRO signal source module is 10-15 GHz.
[0008] Further, the S-band phase-locked signal source module includes a first circuit and a second circuit, the circuit used by the output frequency 2.63-3.38 GHz frequency synthesizer is the first circuit, and the circuit used by the output frequency 2.9425-3.6925 GHz frequency synthesizer is a combination of the first circuit and the second circuit;
[0009] The first circuit includes a single chip microcomputer, an integrated digital phase detection chip, a loop filter, a voltage controlled oscillator, an amplifier and a low pass filter;
[0010] The second circuit includes a single chip microcomputer, an integrated digital phase detection chip, a loop filter, and a voltage controlled oscillator;
[0011] The first circuit and the second circuit perform signal exchange via a mixer.
[0012] Furthermore, the integrated digital phase detection chip includes an R frequency divider, a phase detector and an N frequency divider.
[0013] Furthermore, the X-band phase-locked signal source module includes a sampling phase-locked dielectric oscillator, a crystal oscillator, a precision diode, an active low-pass filter, a voltage-controlled oscillator, an amplifier, a coupler, a power divider and a mixer.
[0014] Furthermore, the sampling phase-locked dielectric oscillator, crystal oscillator, precision diode, active low-pass filter, electrically tunable dielectric oscillator, resistor, amplifier, coupler and mixer.
[0015] Furthermore, the electrically tunable dielectric oscillator includes 6 electrically tunable dielectric oscillators of 10-15 GHz.
[0016] The advantages of the utility model compared with the prior art are: the utility model adopts the matching structure of S-band phase-locked signal source module, X-band phase-locked signal source module, X-band PLL-VCDRO signal source module and Ku-band PLL-VCDRO signal source module, and performs modular design according to the distribution range of output frequency points, which is conducive to system integration, debugging and detection and maintenance; the utility model has a reasonable design and is worthy of vigorous promotion. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a framework diagram of a radar local oscillator module of the utility model.
[0018] Figure 2 The utility model is a framework diagram of an S-band phase-locked signal source module in a radar local oscillator module.
[0019] Figure 3 The utility model discloses a circuit diagram of a first circuit in a radar local oscillator module.
[0020] Figure 4It is a combination diagram of a first circuit and a second circuit in a radar local oscillator module of the utility model.
[0021] Figure 5 The utility model discloses a circuit diagram of an X-band phase-locked signal source module in a radar local oscillator module.
[0022] Figure 6 The utility model discloses a circuit diagram of an X-band PLL-VCDRO signal source module in a radar local oscillator module.
[0023] Figure 7 The utility model discloses a circuit diagram in which a Ku-band PLL-VCDRO signal source module in a radar local oscillator module has an output frequency of 10, 11 and 13 GHz.
[0024] Figure 8 This is a circuit diagram of a radar local oscillator module in the Ku band PLL-VCDRO signal source module with an output frequency of 12, 14, and 15 GHz.
[0025] As shown in the figure: 1. S-band phase-locked signal source module, 2. X-band phase-locked signal source module, 3. X-band PLL-VCDRO signal source module, 4. Ku-band PLL-VCDRO signal source module, 5. first circuit, 6. second circuit. DETAILED DESCRIPTION
[0026] The following is a further detailed description of a radar local oscillator module of the present invention in conjunction with the accompanying drawings.
[0027] Combined with Figure 1-8 , the utility model is introduced in detail.
[0028] A radar local oscillator module, comprising an S-band phase-locked signal source module 1, an X-band phase-locked signal source module 2, an X-band PLL-VCDRO signal source module 3 and a Ku-band PLL-VCDRO signal source module 4, wherein the S-band phase-locked signal source module 1 comprises two parts of output frequencies of 2.63-3.38 GHz and 2.9425-3.6925 GHz; the output frequency of the X-band phase-locked signal source module 2 is 10-11.5 GHz; the X-band PLL-VCDRO signal source module 3 comprises two frequency points of output frequencies of 11.87 GHz and 12.245 GHz; the output frequency of the Ku-band PLL-VCDRO signal source module 4 is 10-15 GHz.
[0029] The S-band phase-locked signal source module 1 includes a first circuit 5 and a second circuit 6. The circuit used by the output frequency 2.63-3.38 GHz frequency synthesizer is the first circuit 5, and the circuit used by the output frequency 2.9425-3.6925 GHz frequency synthesizer is a combination of the first circuit 5 and the second circuit 6.
[0030] The first circuit 5 includes a single chip microcomputer, an integrated digital phase detection chip, a loop filter, a voltage controlled oscillator, an amplifier and a low pass filter;
[0031] The second circuit 6 includes a single chip microcomputer, an integrated digital phase detection chip, a loop filter, and a voltage controlled oscillator;
[0032] The first circuit 5 and the second circuit 6 perform signal exchange via a mixer.
[0033] The integrated digital phase detection chip includes an R frequency divider, a phase detector and an N frequency divider.
[0034] The X-band phase-locked signal source module 2 includes a sampling phase-locked medium oscillator, a crystal oscillator, a precision diode, an active low-pass filter, a voltage-controlled oscillator, an amplifier, a coupler, a power divider and a mixer.
[0035] The X-band PLL-VCDRO signal source module 3 includes a sampling phase-locked dielectric oscillator, a crystal oscillator, a precision diode, an active low-pass filter, a voltage-controlled dielectric oscillator, a coupler, an amplifier and a mixer.
[0036] The Ku-band PLL-VCDRO signal source module 4 includes a sampling phase-locked dielectric oscillator, a crystal oscillator, a precision diode, an active low-pass filter, an electrically tunable dielectric oscillator, a resistor, an amplifier, a coupler and a mixer.
[0037] The electrically tunable dielectric oscillator includes six electrically tunable dielectric oscillators of 10-15 GHz.
[0038] The specific implementation process of a radar local oscillator module of the utility model is as follows: firstly, an S-band phase-locked signal source module 1, an X-band phase-locked signal source module 2, an X-band PLL-VCDRO signal source module 3 and a Ku-band PLL-VCDRO signal source module 4 are constructed according to the attached drawings of the specification, wherein the first circuit and the second circuit included in the S-band phase-locked signal source module 1 are constructed separately;
[0039] The specific implementation of the frequency synthesis with an output frequency of 2.63-3.38GHz is as follows:
[0040] The 2.63-3.38GHz signal source has four output frequencies: 2.63GHz, 2.88GHz, 3.13GHz and 3.38GHz. It is implemented by phase-locked mode. The values of the R and N dividers inside the phase detector are controlled by control instructions to achieve outputs of different frequencies.
[0041] The model of the integrated digital phase detector is ADF4106, the model of the voltage-controlled oscillator is DCMO-190410, the model of the operational amplifier is AD822, and the model of the power amplifier is SBB5089Z power amplifier and PIC18F6622;
[0042] The specific implementation of the frequency synthesis with output power of 2.9425-3.6925GHz is as follows:
[0043] The dual-loop phase-locked method is adopted. The first loop adopts the same scheme as the 2.63-3.38GHz frequency synthesis scheme, and the output frequencies are 2.63GHz, 2.88GHz, 3.13GHz and 3.38GHz. The second loop adopts the mixing phase-locked method, and the output frequency point is mixed with the corresponding frequency point output by the first loop, and the intermediate frequency 312.5MHz signal is phase-locked with the reference 100MHz signal, and finally the required frequency is output.
[0044] The output signal 1f of the first loop is used as the RF signal of the mixer, and the output signal RFout of the second loop is used as the local oscillator signal of the mixer. The output intermediate frequency signal is IF=RFout-f1. After the intermediate frequency signal is filtered out by a low-pass filter to remove high-frequency spurious signals, it is amplified by an amplifier and sent to the phase detector for phase detection with a 100MHz reference signal.
[0045] By using the mixer phase-locked method, the intermediate frequency 312.5MHz signal is significantly lower than the VCO output signal, which can significantly reduce the division number N of the N divider of the phase detector, and can significantly increase the phase detection frequency. Therefore, the mixer phase-locked method can improve the phase noise index of the output signal. According to the mixer phase-locked circuit, the phase noise of the phase-locked frequency source depends on the spectral characteristics of the signal with poor signal noise. The better the noise performance of the first loop output signal, the better the phase noise of the second loop output signal. From the experimental results of the 2.63-3.38GHz signal source above, it can be seen that the phase noise of the first loop output signal is close to -100dBc / Hz at 10k;
[0046] The intermediate frequency signal can be equivalent to that generated by a lower frequency VCO, and the phase noise is better. Therefore, the phase noise of the final output signal of the second loop depends on the phase noise of the output signal of the first loop. The phase noise of the output signal can meet the requirement of -90dBc / Hz@10kHz required by the project.
[0047] The specific implementation of the X-band phase-locked signal source module 2 is as follows:
[0048] The phase noise index of the signal can be greatly improved by using the mixing phase-locked method. The output signal and the signal generated by the sampling phase-locked dielectric oscillator (PLDRO) are down-converted to phase-lock the intermediate frequency signal with the reference signal. Since the signal generated by the PLDRO has extremely low phase noise, the phase-locked loop locks the low intermediate frequency signal to the reference signal, which causes less phase noise degradation. Therefore, the final output RF signal will have better phase noise and meet the requirements.
[0049] The specific implementation of the X-band PLL-VCDRO signal source module 3 is as follows:
[0050] The voltage controlled oscillator (VCO) is replaced by a voltage controlled dielectric oscillator (VCDRO) and a mixing phase-locking method is adopted. The output signal is down-converted with the signal generated by the sampling phase-locked dielectric oscillator (PLDRO), and the intermediate frequency signal is phase-locked with the reference signal. Since the signal generated by the PLDRO has extremely low phase noise, the phase-locked loop locks the low intermediate frequency signal to the reference signal with less phase noise degradation, so the final output RF signal will have better phase noise.
[0051] The specific implementation of the Ku-band PLL-VCDRO signal source module 4 is as follows:
[0052] Therefore, the final output RF signal will have a high performance signal source of 10-15GHz. VCDRO is used instead of the commonly used VCO. The mixing phase-locked method is used to isolate the signals. The output signals of the three VCDROs at 10GHz, 11GHz and 13GHz are down-converted and phase-locked with the output signal of the PLDRO at 12GHz, and the output signals of the three VCDROs at 12GHz, 14GHz and 15GHz are down-converted and phase-locked with the output signal of the PLDRO at 13GHz. In each loop, different VCDROs are locked by switching. The two cavities are controlled as a whole by the switch, and finally the output of 10-15GHz signals is realized (only one VCDRO works at a time and outputs a frequency signal).
[0053] The first step is to complete the design and debugging of 6 VCDROs of 10-15GHz; the second step is to debug each loop individually. The difficulty is that each loop must meet the locking requirements of three VCDROs. Since the tuning bandwidth of each DRO is inconsistent, the loop debugging is relatively difficult; finally, well-controlled phase noise is achieved through external control signals.
[0054] The utility model adopts a matching structure of an S-band phase-locked signal source module 1, an X-band phase-locked signal source module 2, an X-band PLL-VCDRO signal source module 3 and a Ku-band PLL-VCDRO signal source module 4, and performs modular design according to the distribution range of the output frequency points, which is beneficial to system integration, debugging, and detection and maintenance; the utility model has a reasonable design and is worthy of vigorous promotion.
[0055] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.
Claims
1. A radar local oscillator module, characterized in that: The radar local oscillator module comprises an S-band phase-locked signal source module (1), an X-band phase-locked signal source module (2), an X-band PLL-VCDRO signal source module (3) and a Ku-band PLL-VCDRO signal source module (4); the S-band phase-locked signal source module (1) comprises two parts of output frequencies of 2.63-3.38 GHz and 2.9425-3.6925 GHz; the output frequency of the X-band phase-locked signal source module (2) is 10-11.5 GHz; the X-band PLL-VCDRO signal source module (3) comprises two frequency points of output frequencies of 11.87 GHz and 12.245 GHz; and the output frequency of the Ku-band PLL-VCDRO signal source module (4) is 10-15 GHz.
2. A radar local oscillator module according to claim 1, characterized in that: The S-band phase-locked signal source module (1) comprises a first circuit (5) and a second circuit (6); the circuit used by the frequency synthesizer with an output frequency of 2.63-3.38 GHz is the first circuit (5); and the circuit used by the frequency synthesizer with an output frequency of 2.9425-3.6925 GHz is a combination of the first circuit (5) and the second circuit (6); The first circuit (5) comprises a single chip microcomputer, an integrated digital phase detection chip, a loop filter, a voltage controlled oscillator, an amplifier and a low pass filter; The second circuit (6) comprises a single chip microcomputer, an integrated digital phase detection chip, a loop filter, and a voltage controlled oscillator; The first circuit (5) and the second circuit (6) perform signal exchange via a mixer.
3. A radar local oscillator module according to claim 2, characterized in that: The integrated digital phase detection chip includes an R frequency divider, a phase detector and an N frequency divider.
4. The radar local oscillator module according to claim 1, characterized in that: The X-band phase-locked signal source module (2) comprises a sampling phase-locked medium oscillator, a crystal oscillator, a precision diode, an active low-pass filter, a voltage-controlled oscillator, an amplifier, a coupler, a power divider and a mixer.
5. The radar local oscillator module according to claim 1, characterized in that: The X-band PLL-VCDRO signal source module (3) comprises a sampling phase-locked dielectric oscillator, a crystal oscillator, a precision diode, an active low-pass filter, a voltage-controlled dielectric oscillator, a coupler, an amplifier and a mixer.
6. The radar local oscillator module according to claim 1, characterized in that: The Ku-band PLL-VCDRO signal source module (4) comprises a sampling phase-locked dielectric oscillator, a crystal oscillator, a precision diode, an active low-pass filter, an electrically adjustable dielectric oscillator, a resistor, an amplifier, a coupler and a mixer.
7. A radar local oscillator module according to claim 6, characterized in that: The electrically tunable dielectric oscillator includes six electrically tunable dielectric oscillators of 10-15 GHz.