Digital receiving apparatus, system, and method for tracking and observing target radio source

A digital receiving apparatus for tracking and observing a target radio source, comprising

• an analog-to-digital conversion module, a delay parameter temporary storage module, a polyphase filter module, a fast Fourier transform module, a phase compensation module, a phase parameter generation module, a standard time acquisition module, a control enable module, a communication module, and a delay module;
• wherein
• the analog-to-digital conversion module is configured to acquire a real-time antenna signal from the target radio source, acquire a to-be-compensated delay parameter in the delay parameter temporary storage module at a corresponding moment based on an update enable sent by the control enable module, compensate the real-time antenna signal by a delay equal to an integral multiple of a sampling period in combination with a read enable and a write enable to obtain a delay-compensated antenna signal, and then send the delay-compensated antenna signal to the polyphase filter module;
• the polyphase filter module is configured to perform polyphase filtering on the delay-compensated antenna signal to obtain a filtered antenna signal and send the filtered antenna signal to the fast Fourier transform module;
• the fast Fourier transform module is configured to perform a fast Fourier transform on the filtered antenna signal to obtain a transformed frequency-domain signal and send the transformed frequency-domain signal to the phase compensation module;
• the phase compensation module is configured to compensate for, based on a phase compensation parameter sent by the phase parameter generation module, a phase difference of the transformed frequency-domain signal, and output a spectrum signal for tracking and observing the target radio source, wherein the phase difference of the transformed frequency-domain signal is caused by a delay difference less than the sampling period;
• the standard time acquisition module is configured to acquire a timestamp of a standard time server and send the timestamp to the control enable module;
• the communication module is configured to establish a communication between a host computer and each of the delay parameter temporary storage module, the control enable module and the phase parameter generation module, send an acquired control instruction sent by the host computer to the control enable module, and send an acquired current to-be-compensated parameter sent by the host computer to the delay parameter temporary storage module and the phase parameter generation module;
• the control enable module is configured to generate the read enable, the write enable and the update enable based on the timestamp of the standard time server and the acquired control instruction sent by the host computer, and send the read enable, the write enable and the update enable to the delay parameter temporary storage module, the delay module, and the analog-to-digital conversion module;
• the delay parameter temporary storage module is configured to temporarily store the to-be-compensated delay parameter equal to an integral multiple of the sampling period in a continuous observation period;
• the delay module is configured to delay the read enable by a set time to obtain a delayed read enable and send the delayed read enable to the phase parameter generation module;
• and
• the phase parameter generation module is configured to temporarily store a to-be-compensated delay parameter less than the sampling period in the continuous observation period, read the to-be-compensated delay parameter less than the sampling period at the corresponding moment according to a read enable signal outputted by the delay module, and convert the to-be-compensated delay parameter less than the sampling period into a phase compensation parameter.