Digital Calibration Based on Polyphase Structure for Electronic Surveillance

Abstract

In electronic surveillance systems, one common method is to transform the sampled data to frequency domain for signal detection. High speed sampling rate usually relies on time interleaving technology, but the inconsistency of interleaving channels often leads to the deterioration of sampling performance. The traditional ADC device inconsistency correction algorithm is independent of the digital receiver architecture, and needs to add a separate correction module, which increases the device resource utilization. Based on the traditional digital receiver architecture, this paper designs a new correction algorithm based on polyphase structure. This algorithm not only realizes the inconsistent correction of ADC, but also reduces the utilization of device resources of electronic surveillance system. Theoretical analysis and simulation results show the effectiveness of the proposed algorithm.