Within the signal range of the portable image receiver, the front-end video acquisition terminal collects the video data and audio data of the scene, transmits them to the portable image receiver through the backpack individual transmitter, and then forwards them back to the back-end command center through the 4G/5G module of the receiver; When the distance between the knapsack type individual transmitter and the portable image receiver is too far to communicate directly, the image transmission relay equipment can be used to relay video, voice and data to achieve remote wireless image transmission.