A receiver system based on digitally controlled phase shifting to achieve low intermediate frequency image suppression broadband function

Abstract

The present invention relates to a receiver system for realizing low intermediate frequency image suppression broadband function based on digital controlled phase shifting, comprising a broadband orthogonal IQ demodulation unit, a first anti-aliasing filter unit, a second anti-aliasing filter unit, a high-purity frequency synthesis local oscillator unit, a first digital gain amplification unit, a second digital gain amplification unit, a first bandpass filter unit, a second bandpass filter unit, a first digital controlled phase shifting unit, an amplitude and phase detection unit, a second digital controlled phase shifting unit, a first high-speed ADC unit, a second high-speed ADC unit, and a high-performance DSP unit, wherein the units are sequentially connected. The present invention realizes good image suppression during low intermediate frequency analysis of broadband signals, and at the same time, the amplitude and phase of the I-Q two-way signal have high stability, and can realize a high-performance low intermediate frequency image suppression broadband receiver.

Description

Technical Field

[0001] The present invention relates to the field of mobile communications, in particular to the field of broadband receivers, and specifically refers to a receiver system that realizes a low intermediate frequency image suppression broadband function based on digitally controlled phase shifting. Background Art

[0002] As an important part of mobile communication testing, broadband receivers are widely used in various fields such as navigation, radar, and communication, and have important economic and social benefits. High-performance broadband receivers are a technical difficulty in the current mobile communication field. Traditional low-IF broadband receivers do not have the advantage of DC offset interference, but the demodulation path usually uses analog phase shifting for image suppression, which has poor image suppression indicators and amplitude and phase imbalance, resulting in poor receiver resolution indicators. Therefore, the existing technical solutions cannot meet the technical requirements of high-performance broadband receivers. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a receiver system which is simple to operate, has high accuracy and a wide range of applications, and which realizes low intermediate frequency image suppression broadband function based on digitally controlled phase shifting.

[0004] In order to achieve the above object, the receiver system of the present invention which realizes the low intermediate frequency image suppression broadband function based on digitally controlled phase shifting is as follows:

[0005] The receiver system based on digitally controlled phase shifting to realize low intermediate frequency image suppression broadband function has the main characteristics that the system comprises:

[0006] A broadband orthogonal IQ demodulation unit, used to perform IQ orthogonal demodulation on a broadband input signal and output I-channel and Q-channel signals;

[0007] A first anti-aliasing filter unit is connected to the broadband orthogonal IQ demodulation unit and is used to perform low-pass filtering on the demodulated I-channel signal to filter out interference signals generated by frequency mixing;

[0008] A second anti-aliasing filter unit is connected to the broadband orthogonal IQ demodulation unit and is used to perform low-pass filtering on the demodulated Q-path signal to filter out interference signals generated by frequency mixing;

[0009] A first digital gain amplification unit, connected to the first anti-aliasing filter unit, is used to perform dynamic gain amplification on the I-channel signal after low-pass filtering to make the I-channel and Q-channel signal amplitudes equal;

[0010] A second digital gain amplification unit is connected to the second anti-aliasing filter unit and is used to perform dynamic gain amplification on the Q-path signal after low-pass filtering to make the amplitudes of the I-path and Q-path signals equal;

[0011] A first bandpass filter unit, connected to the first digital gain amplifier unit, for performing bandpass filtering on the amplified I-channel signal to filter out interference signals in the channel;

[0012] A second bandpass filter unit is connected to the second digital gain amplifier unit and is used to perform bandpass filtering on the amplified Q-path signal to filter out interference signals in the path;

[0013] A first digitally controlled phase shift unit, connected to the second bandpass filter unit, for performing digitally controlled phase shifting on the filtered Q-path signal;

[0014] A second digitally controlled phase shift unit is connected to the first digitally controlled phase shift unit and is used to perform a 90° digitally controlled phase shift on the phase-shifted Q-path signal again;

[0015] A first high-speed ADC unit, connected to the first band-pass filter unit, for performing analog-to-digital conversion on an input I-channel signal;

[0016] A second high-speed ADC unit, connected to the second digitally controlled phase shift unit, for performing analog-to-digital conversion on the input Q-path signal;

[0017] The high-performance DSP unit is connected to the first high-speed ADC unit and the second high-speed ADC unit, and is used to perform FIR filtering, extraction, summation and FFT transformation on the converted I-channel and Q-channel signals.

[0018] Preferably, the system further comprises a high-purity frequency synthesis local oscillator unit connected to the broadband orthogonal IQ demodulation unit for providing an ultra-low phase noise local oscillator signal to the broadband orthogonal IQ demodulation unit for mixing with the broadband input signal.

[0019] Preferably, it is connected to the first digitally controlled phase shift unit and the first bandpass filter unit, and is used to compare the amplitude and phase of the I-channel and Q-channel signals, and measure the amplitude and phase difference;

[0020] Preferably, the broadband orthogonal IQ demodulation unit includes a 90° phase shifter and a mixer, the output end of the 90° phase shifter is connected to the mixer, and the mixer is respectively connected to the first anti-aliasing filter unit and the second anti-aliasing filter unit, for performing phase shifting on the local oscillator signal and mixing them to realize I-channel and Q-channel outputs.

[0021] Preferably, the high-performance DSP unit includes a FIR filter, a decimation filter, an adder and an FFT processor, the FIR filter is connected to the first high-speed ADC unit and the second high-speed ADC unit respectively, the decimation filter is connected to the FIR filter, the adder is connected to the decimation filter, and the FFT processor is connected to the adder, for performing high-speed signal processing on the input I and Q signals.

[0022] The receiver system of the present invention that realizes the low intermediate frequency image suppression broadband function based on digitally controlled phase shifting meets the requirements of high image suppression, amplitude / phase balance, large bandwidth, and high resolution index, and can be widely used in low intermediate frequency image suppression broadband receivers in various fields such as navigation, radar, and communication. In view of the performance requirements of broadband receivers, broadband orthogonal demodulation, anti-aliasing filtering, dynamic gain amplification, digitally controlled phase shifting, amplitude and phase detection, etc. are used to support the resolution performance of the low intermediate frequency solution broadband receiver. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a schematic structural diagram of a receiver system that realizes a low intermediate frequency image suppression broadband function based on digitally controlled phase shifting.

[0024] Reference numerals:

[0025] 1Wideband orthogonal IQ demodulation unit

[0026] 2First anti-aliasing filter unit

[0027] 3 Second anti-aliasing filter unit

[0028] 4 high-purity frequency synthetic local oscillator units

[0029] 5The first digital gain amplifier unit

[0030] 6. Second digital gain amplifier unit

[0031] 7First bandpass filter unit

[0032] 8 Second bandpass filter unit

[0033] 9The first digital controlled phase shift unit

[0034] 10 phase detection units

[0035] 11The second digital controlled phase shifting unit

[0036] 12First high-speed ADC unit

[0037] 13 Second high-speed ADC unit

[0038] 14 high performance DSP units DETAILED DESCRIPTION

[0039] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0040] The receiver system of the present invention, which realizes the low intermediate frequency image suppression broadband function based on digitally controlled phase shifting, comprises: a broadband orthogonal IQ demodulation unit, which is used to perform IQ orthogonal demodulation on a broadband input signal and output I-channel and Q-channel signals;

[0041] A first anti-aliasing filter unit is connected to the broadband orthogonal IQ demodulation unit and is used to perform low-pass filtering on the demodulated I-channel signal to filter out interference signals generated by frequency mixing;

[0042] A second anti-aliasing filter unit is connected to the broadband orthogonal IQ demodulation unit and is used to perform low-pass filtering on the demodulated Q-path signal to filter out interference signals generated by frequency mixing;

[0043] A first digital gain amplification unit, connected to the first anti-aliasing filter unit, is used to perform dynamic gain amplification on the I-channel signal after low-pass filtering to make the I-channel and Q-channel signal amplitudes equal;

[0044] A second digital gain amplification unit is connected to the second anti-aliasing filter unit and is used to perform dynamic gain amplification on the Q-path signal after low-pass filtering to make the amplitudes of the I-path and Q-path signals equal;

[0045] A first bandpass filter unit, connected to the first digital gain amplifier unit, for performing bandpass filtering on the amplified I-channel signal to filter out interference signals in the channel;

[0046] A second bandpass filter unit is connected to the second digital gain amplifier unit and is used to perform bandpass filtering on the amplified Q-path signal to filter out interference signals in the path;

[0047] A first digitally controlled phase shift unit, connected to the second bandpass filter unit, for performing digitally controlled phase shifting on the filtered Q-path signal;

[0048] A second digitally controlled phase shift unit is connected to the first digitally controlled phase shift unit and is used to perform a 90° digitally controlled phase shift on the phase-shifted Q-path signal again;

[0049] A first high-speed ADC unit, connected to the first band-pass filter unit, for performing analog-to-digital conversion on an input I-channel signal;

[0050] A second high-speed ADC unit, connected to the second digitally controlled phase shift unit, for performing analog-to-digital conversion on the input Q-path signal;

[0051] The high-performance DSP unit is connected to the first high-speed ADC unit and the second high-speed ADC unit, and is used to perform FIR filtering, extraction, summation and FFT transformation on the converted I-channel and Q-channel signals.

[0052] Preferably, the system further comprises a high-purity frequency synthesis local oscillator unit connected to the broadband orthogonal IQ demodulation unit for providing an ultra-low phase noise local oscillator signal to the broadband orthogonal IQ demodulation unit for mixing with the broadband input signal.

[0053] Preferably, it is connected to the first digitally controlled phase shift unit and the first bandpass filter unit, and is used to compare the amplitude and phase of the I-channel and Q-channel signals, and measure the amplitude and phase difference;

[0054] As a preferred embodiment of the present invention, the broadband orthogonal IQ demodulation unit includes a 90° phase shifter and a mixer, the output end of the 90° phase shifter is connected to the mixer, and the mixer is respectively connected to the first anti-aliasing filter unit and the second anti-aliasing filter unit, for phase shifting the local oscillator signal and mixing it to realize I and Q outputs.

[0055] As a preferred embodiment of the present invention, the high-performance DSP unit includes a FIR filter, a decimation filter, an adder and an FFT processor. The FIR filter is connected to the first high-speed ADC unit and the second high-speed ADC unit respectively, the decimation filter is connected to the FIR filter, the adder is connected to the decimation filter, and the FFT processor is connected to the adder, for performing high-speed signal processing on the input I and Q signals.

[0056] In a specific embodiment of the present invention, the broadband orthogonal IQ demodulation unit is used to perform IQ orthogonal demodulation on a broadband input signal to output I-path and Q-path signals;

[0057] A first anti-aliasing filter unit is connected to the broadband orthogonal IQ demodulation unit and is used to perform low-pass filtering on the demodulated I-channel signal to filter out interference signals generated by frequency mixing;

[0058] A second anti-aliasing filter unit is connected to the broadband orthogonal IQ demodulation unit and is used to perform low-pass filtering on the demodulated Q-path signal to filter out interference signals generated by frequency mixing;

[0059] A high-purity frequency synthesis local oscillator unit is connected to the broadband orthogonal IQ demodulation unit and is used to provide an ultra-low phase noise local oscillator signal to the broadband orthogonal IQ demodulation unit for mixing with the broadband input signal;

[0060] A first digital gain amplification unit, connected to the first anti-aliasing filter unit, is used to perform dynamic gain amplification on the I-channel signal after low-pass filtering to ensure that the amplitudes of the I-channel and Q-channel signals are equal;

[0061] A second digital gain amplification unit, connected to the second anti-aliasing filter unit, is used to perform dynamic gain amplification on the Q-path signal after low-pass filtering to ensure that the amplitudes of the I-path and Q-path signals are equal;

[0062] A first bandpass filter unit, connected to the first digital gain amplifier unit, for performing bandpass filtering on the amplified I-channel signal to filter out interference signals in the channel;

[0063] A second bandpass filter unit is connected to the second digital gain amplifier unit and is used to perform bandpass filtering on the amplified Q-path signal to filter out interference signals in the path;

[0064] The first digitally controlled phase shifting unit is connected to the second bandpass filter unit and is used to perform digitally controlled phase shifting on the filtered Q-path signal to ensure that the phase difference between the I-path and Q-path signals is stabilized at 90°.

[0065] An amplitude and phase detection unit, connected to the first digitally controlled phase shift unit and the first bandpass filter unit, for comparing the amplitude and phase of the I-channel and Q-channel signals and measuring the amplitude and phase difference;

[0066] A second digitally controlled phase shift unit is connected to the first digitally controlled phase shift unit and is used to perform a 90° digitally controlled phase shift on the phase-shifted Q-path signal again to ensure that the receiver has good image suppression;

[0067] A first high-speed ADC unit, connected to the first band-pass filter unit, for performing analog-to-digital conversion on an input I-channel signal;

[0068] A second high-speed ADC unit, connected to the second digitally controlled phase shift unit, for performing analog-to-digital conversion on the input Q-path signal;

[0069] The high-performance DSP unit is connected to the first high-speed ADC unit and the second high-speed ADC unit, and is used to perform FIR filtering, extraction, summation and FFT transformation on the converted I-channel and Q-channel signals to achieve high-speed digital signal processing.

[0070] As a preferred embodiment of the present invention, the broadband orthogonal IQ demodulation unit includes a 90° phase shifter and a mixer, which are used to phase shift the local oscillator signal and then mix it to realize I-channel and Q-channel outputs.

[0071] As a preferred embodiment of the present invention, the high-performance DSP unit includes a FIR filter, a decimation filter, an adder and a FFT, which are used to perform high-speed signal processing on the input I-channel and Q-channel signals to meet the high-performance analysis indicators of the receiver.

[0072] In a specific embodiment of the present invention, a low-IF image suppression broadband receiver is provided that meets the requirements of high image suppression, amplitude / phase balance, large bandwidth, and high resolution indicators and can be widely used in various fields such as navigation, radar, and communication. In view of the performance requirements of the broadband receiver, broadband orthogonal demodulation, anti-aliasing filtering, dynamic gain amplification, digitally controlled phase shifting, amplitude and phase detection, etc. are used to support the resolution performance of the low-IF broadband receiver.

[0073] like Figure 1 As shown, a receiver system for realizing a low intermediate frequency image suppression broadband function based on digitally controlled phase shifting includes a broadband orthogonal IQ demodulation unit 1, a first anti-aliasing filter unit 2, a second anti-aliasing filter unit 3, a high-purity frequency synthesis local oscillator unit 4, a first digital gain amplifier unit 5, a second digital gain amplifier unit 6, a first band-pass filter unit 7, a second band-pass filter unit 8, a first digitally controlled phase shift unit 9, an amplitude and phase detection unit 10, a second digitally controlled phase shift unit 11, a first high-speed ADC unit 12, a second high-speed ADC unit 13, and a high-performance DSP unit 14, wherein the modules are sequentially connected.

[0074] A broadband orthogonal IQ demodulation unit 1 is configured to perform IQ orthogonal demodulation on a broadband input signal and output I-channel and Q-channel signals;

[0075] A first anti-aliasing filter unit 2 is configured to perform low-pass filtering on the demodulated I-channel signal to filter out interference signals generated by frequency mixing;

[0076] The second anti-aliasing filter unit 3 is configured to perform low-pass filtering on the demodulated Q-path signal to filter out interference signals generated by frequency mixing;

[0077] The high-purity frequency synthesis local oscillator unit 4 is configured to provide an ultra-low phase noise local oscillator signal to the broadband orthogonal IQ demodulation unit for mixing with the broadband input signal;

[0078] The first digital gain amplification unit 5 is configured to perform dynamic gain amplification on the I-channel signal after low-pass filtering to ensure that the amplitudes of the I-channel and Q-channel signals are equal;

[0079] The second digital gain amplification unit 6 is configured to perform dynamic gain amplification on the Q-path signal after low-pass filtering to ensure that the amplitudes of the I-path and Q-path signals are equal;

[0080] The first bandpass filter unit 7 is configured to perform bandpass filtering on the amplified I-channel signal to filter out interference signals in the channel;

[0081] The second bandpass filter unit 8 is configured to perform bandpass filtering on the amplified Q-path signal to filter out interference signals in the path;

[0082] The first digitally controlled phase shifting unit 9 is configured to perform digitally controlled phase shifting on the filtered Q-path signal to ensure that the phase difference between the I-path and Q-path signals is stabilized at 90°.

[0083] The amplitude and phase detection unit 10 is configured to compare the amplitude and phase of the I-channel and Q-channel signals and measure the amplitude and phase difference;

[0084] The second digitally controlled phase shifting unit 11 is configured to perform a 90° digitally controlled phase shift on the phase-shifted Q-path signal again, so as to ensure that the receiver has good image suppression;

[0085] A first high-speed ADC unit 12 is configured to perform analog-to-digital conversion on an input I-channel signal;

[0086] The second high-speed ADC unit 13 is configured to perform analog-to-digital conversion on the input Q-path signal;

[0087] The high-performance DSP unit 14 is configured to perform FIR filtering, extraction, summation and FFT transformation on the converted I-channel and Q-channel signals to achieve high-speed digital signal processing.

[0088] The low intermediate frequency solution of the receiver system of the technical solution of the present invention is implemented by a broadband orthogonal IQ demodulator, and the output low intermediate frequency broadband signal uses a digitally controlled phase shift unit and an amplitude and phase monitoring unit to strictly control the phases of the IQ two-way signal, and then enters the DSP and sums them for image suppression.

[0089] The technical solution of the present invention utilizes a digitally controlled phase shift unit to perform phase control, thereby ensuring the amplitude and phase requirements of the output IQ two-way signals, and can better suppress the image frequency after superposition.

[0090] The specific working method of the device is as follows: a broadband signal is input into a broadband orthogonal IQ demodulation unit 1 and is subjected to broadband orthogonal mixing with an ultra-low phase noise local oscillator signal generated by a high-purity frequency synthesis local oscillator unit 4 to generate I-path and Q-path signal outputs; the I-path signal is subjected to low-pass filtering by a first anti-aliasing filter unit 2 to filter out interference signals generated by mixing; the Q-path signal is subjected to low-pass filtering by a second anti-aliasing filter unit 3 to filter out interference signals generated by mixing; the I-path signal after low-pass filtering enters a first digital gain amplifier unit 5 for dynamic gain amplification; the Q-path signal after low-pass filtering enters a second digital gain amplifier unit 6 for dynamic gain amplification; the I-path and Q-path signals are adjusted dynamically to ensure that the amplitudes of the two paths are equal; the amplified I-path signal enters a first bandpass filter unit 7 for bandpass filtering to filter out interference signals in the path; the amplified Q-path signal enters a first bandpass filter unit 8 Bandpass filtering is performed to filter out interference signals in the path. The Q-path signal after bandpass filtering is digitally phase-shifted by the first digitally controlled phase shift unit 9. Then, the I-path and Q-path signals are sent to the amplitude and phase detection unit 10 for amplitude and phase comparison to ensure that the amplitudes of the I-path and Q-path signals are equal and the phase difference is stable at 90°. The Q-path signal after phase shift is digitally phase-shifted by 90° again by the second digitally controlled phase shift unit 11 to ensure that the receiver has good image suppression. Subsequently, the I-path signal is digitally converted to analog by the first high-speed ADC unit 12, and the Q-path signal is digitally converted to analog by the second high-speed ADC unit 13. The converted I-path and Q-path signals enter the high-performance DSP unit 14 for digital signal processing such as FIR filtering, extraction, summation and FFT change, and finally a receiver system with low intermediate frequency image suppression broadband function based on digitally controlled phase shifting is realized to meet the mobile communication test requirements.

[0091] The specific implementation scheme of this embodiment can refer to the relevant description in the above embodiment, which will not be repeated here.

[0092] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0093] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0094] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0095] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution device. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0096] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the corresponding program may be stored in a computer-readable storage medium, which, when executed, includes one of the steps of the method embodiment or a combination thereof.

[0097] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0098] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0099] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0100] The receiver system of the present invention that realizes the low intermediate frequency image suppression broadband function based on digitally controlled phase shifting meets the requirements of high image suppression, amplitude / phase balance, large bandwidth, and high resolution index, and can be widely used in low intermediate frequency image suppression broadband receivers in various fields such as navigation, radar, and communication. In view of the performance requirements of broadband receivers, broadband orthogonal demodulation, anti-aliasing filtering, dynamic gain amplification, digitally controlled phase shifting, amplitude and phase detection, etc. are used to support the resolution performance of the low intermediate frequency solution broadband receiver.

[0101] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it is apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A receiver system based on digitally controlled phase shifting to achieve low intermediate frequency image suppression broadband function, characterized in that: The system comprises: A broadband orthogonal IQ demodulation unit, used to perform IQ orthogonal demodulation on a broadband input signal and output I-channel and Q-channel signals; A first anti-aliasing filter unit is connected to the broadband orthogonal IQ demodulation unit and is used to perform low-pass filtering on the demodulated I-channel signal to filter out interference signals generated by frequency mixing; A second anti-aliasing filter unit is connected to the broadband orthogonal IQ demodulation unit and is used to perform low-pass filtering on the demodulated Q-path signal to filter out interference signals generated by frequency mixing; A first digital gain amplification unit, connected to the first anti-aliasing filter unit, is used to perform dynamic gain amplification on the I-channel signal after low-pass filtering to make the I-channel and Q-channel signal amplitudes equal; A second digital gain amplification unit is connected to the second anti-aliasing filter unit and is used to perform dynamic gain amplification on the Q-path signal after low-pass filtering to make the amplitudes of the I-path and Q-path signals equal; A first bandpass filter unit, connected to the first digital gain amplifier unit, for performing bandpass filtering on the amplified I-channel signal to filter out interference signals in the channel; A second bandpass filter unit is connected to the second digital gain amplifier unit and is used to perform bandpass filtering on the amplified Q-path signal to filter out interference signals in the path; A first digitally controlled phase shift unit, connected to the second bandpass filter unit, for performing digitally controlled phase shifting on the filtered Q-path signal; A second digitally controlled phase shift unit is connected to the first digitally controlled phase shift unit and is used to perform a 90° digitally controlled phase shift on the phase-shifted Q-path signal again; A first high-speed ADC unit, connected to the first band-pass filter unit, for performing analog-to-digital conversion on an input I-channel signal; A second high-speed ADC unit, connected to the second digitally controlled phase shift unit, for performing analog-to-digital conversion on the input Q-path signal; A high-performance DSP unit connected to the first high-speed ADC unit and the second high-speed ADC unit, for performing FIR filtering, extraction, summing and FFT transformation on the converted I-channel and Q-channel signals; The system further comprises a high-purity frequency synthesis local oscillator unit connected to the broadband orthogonal IQ demodulation unit, and used for providing an ultra-low phase noise local oscillator signal to the broadband orthogonal IQ demodulation unit for mixing with the broadband input signal; The system further comprises an amplitude and phase detection unit connected to the first digitally controlled phase shift unit and the first bandpass filter unit, and used for comparing the amplitude and phase of the I-channel and Q-channel signals, and measuring the amplitude and phase difference; The broadband orthogonal IQ demodulation unit includes a 90° phase shifter and a mixer, the output end of the 90° phase shifter is connected to the mixer, and the mixer is respectively connected to the first anti-aliasing filter unit and the second anti-aliasing filter unit, and is used to phase shift the local oscillator signal and then mix it to realize I-channel and Q-channel output.

2. The receiver system for realizing low intermediate frequency image suppression broadband function based on digitally controlled phase shifting according to claim 1, characterized in that: The high-performance DSP unit includes an FIR filter, a decimation filter, an adder and an FFT processor. The FIR filter is connected to the first high-speed ADC unit and the second high-speed ADC unit respectively, the decimation filter is connected to the FIR filter, the adder is connected to the decimation filter, and the FFT processor is connected to the adder, and is used to perform high-speed signal processing on the input I and Q signals.

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