A　broadband　photonic　microwave　signal　processor　based　on　integrated　dual-polarization　dual-parallel　Mach-Zehnder　modulator　(DP-DPMZM)　is　proposed.　The　processor　has　a　tunable　local　oscillator　(LO)　signal,　which　is　generated　by　the　optoelectronic　oscillator　(OEO)　loop　in　one　of　the　sub-DPMZM　with　high　spectral　purity　and　low　phase　noise,　and　its　center　frequency　can　be　tuned　by　electronic　band-pass　filter　(EBPF).　Using　the　bias　voltage　of　DP-DPMZM　and　fiber　Bragg　grating,　the　carrier-suppressed　single-sideband　(CS-SSB)　modulation　of　LO　and　RF　signals　can　be　realized,　and　the　up　or　down　conversion　of　frequency　converter　can　be　realized　by　adjusting　the　single　bias　voltage　of　DP-DPMZM.　Moreover,　the　power　fading　caused　by　dispersion　is　well　compensated　with　the　SSB　modulation.　The　experimental　results　show　that　the　tunable　LO　signal　of　6-20　GHz　is　successfully　generated,　the　side　mode　rejection　ratio　is　as　high　as　48.4　dB,　and　the　10　kHz　phase　noise　is　107.6　dBc/Hz　at　8　GHz.　The　spurious　rejection　ratio　of　up-down　conversion　signal　is　31.4　dB　and　33.6　dB,　respectively.